CN111483486B - Air conditioner for railway vehicle and dehumidification method thereof - Google Patents
Air conditioner for railway vehicle and dehumidification method thereof Download PDFInfo
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- CN111483486B CN111483486B CN202010362414.4A CN202010362414A CN111483486B CN 111483486 B CN111483486 B CN 111483486B CN 202010362414 A CN202010362414 A CN 202010362414A CN 111483486 B CN111483486 B CN 111483486B
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- 238000007791 dehumidification Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims description 22
- 239000004065 semiconductor Substances 0.000 claims abstract description 108
- 238000009825 accumulation Methods 0.000 claims abstract description 74
- 238000001514 detection method Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000004378 air conditioning Methods 0.000 claims description 14
- 238000005057 refrigeration Methods 0.000 claims description 11
- 238000009833 condensation Methods 0.000 abstract description 13
- 230000005494 condensation Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 13
- 238000001816 cooling Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 241000271559 Dromaiidae Species 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0018—Air-conditioning means, i.e. combining at least two of the following ways of treating or supplying air, namely heating, cooling or ventilating
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Abstract
An air conditioner for a rail vehicle includes a control system; an air duct; the phase change cold accumulation device is arranged in the air duct; the semiconductor dehumidifying device is arranged in the air duct and is positioned between the inlet end of the cold accumulation device and the inlet end of the air duct; the temperature and humidity detection piece is arranged in the air duct and is used for detecting the temperature and the dew point temperature of the phase change cold storage device and the semiconductor dehumidification device; the semiconductor dehumidification device and the temperature and humidity detection device are electrically connected with the control system. And the wind speed detection device is arranged at the tail end of the air duct and is used for detecting the wind speed in the air duct of the air conditioner of the railway vehicle. Therefore, the technical problem that the condensation is easy to occur on the surface of the cold accumulation device in the prior art to influence the cold release rate and the effect of the cold accumulation device is solved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner for a railway vehicle and a dehumidification method thereof.
Background
When the rail transit vehicle cannot normally work due to power supply or other abnormal conditions, the emergency ventilation system is usually started, the cold energy stored by the cold accumulation device is released, and the temperature rise rate of the air in the vehicle is delayed.
However, the cold accumulation device in the prior art has an obvious defect in the use process: when the air humidity is large, the condensation phenomenon occurs on the surface of the cold accumulation device, water vapor in the air is separated out and generates condensed water, the cold release rate and the cold release effect of the cold accumulation device are influenced, and the separated condensed water stays in an air supply duct of the air conditioner, so that adverse effects are brought to the environment in the vehicle and the operation of an air conditioning system.
Disclosure of Invention
The invention aims to provide an air conditioner for a railway vehicle and a dehumidification method thereof, and aims to solve the technical problem that condensation is easy to occur on the surface of a cold accumulation device to affect the cold release rate and the cold release effect of the cold accumulation device in the prior art.
In order to realize the purpose, the invention adopts the following technical scheme:
an air conditioner for a rail vehicle, comprising:
a control system;
an air duct;
the phase change cold accumulation device is arranged in the air duct;
the semiconductor dehumidifying device is arranged in the air duct and is positioned between the inlet end of the cold accumulation device and the inlet end of the air duct;
the temperature and humidity detection piece is arranged in the air duct and is used for detecting the temperature and the dew point temperature of the phase change cold storage device and the semiconductor dehumidification device;
the semiconductor dehumidification device and the temperature and humidity detection device are electrically connected with the control system;
and the wind speed detection device is arranged at the tail end of the air duct and is used for detecting the wind speed in the air duct of the air conditioner of the railway vehicle.
Preferably, the semiconductor dehumidification device comprises a power supply switch and a semiconductor dehumidification component;
the power supply switch and the semiconductor dehumidification assembly are connected with the control system through a direct-current power supply; and the power supply switch is used for controlling the direct current power supply to supply power to the semiconductor dehumidifying component.
Preferably, the semiconductor dehumidification assembly comprises a semiconductor refrigeration end face, a cold end face energy taking device and a water collecting container are arranged at the semiconductor refrigeration end face, and the water collecting container is used for collecting condensed water formed after dehumidification.
Preferably, the temperature and humidity detection device comprises an air duct inlet sensor, a semiconductor dehumidification device temperature sensor and a phase change cold storage device temperature sensor.
Preferably, the phase change cold storage device further comprises a timer, wherein the timer is arranged on the phase change cold storage device and is used for recording the time length of the phase change cold storage device when the phase change cold storage device starts to work.
When an air conditioning system of the railway vehicle breaks down, the phase change cold accumulation device starts to release cold energy;
temperature and humidity detection device collects temperature T of wall surface of tail section of phase change cold storage device in air duct in real timewtSurface temperature T of refrigerating end face of semiconductor dehumidifying componentctDew point temperature TdtSending the data to the control system;
the control system judges the dew point temperature TdtTemperature T of wall surface of tail section of cold accumulation devicewtThe size of (2):
if Twt≧TdtThe semiconductor dehumidifying device is in a non-working state;
if Twt<TdtAnd the semiconductor dehumidifying device starts to operate, and after the dehumidifying condition is achieved, water vapor in the air is condensed into water at the semiconductor dehumidifying device and is separated out.
Preferably, when the phase change cold storage device starts to operate, the control system controls the timer to be started and starts to record the operation time t of the phase change cold storage device1(ii) a The preset dehumidification time in the control system is t2(ii) a The control system judges the time t for the phase change cold storage device to start to operate1And a preset dehumidification time t2The size of (2):
if t1<t2And Twt≤TdtThe semiconductor dehumidifying device continues to dehumidify;
if t1<t2And Twt>TdtThe semiconductor dehumidifying device stops operating and completes dehumidifying;
if t1≥t2And the control system controls the semiconductor dehumidifying device to be closed, and the air conditioner exits the dehumidifying mode.
Preferably, the dehumidification condition comprises a surface temperature T of a refrigeration end face of the semiconductor dehumidification assemblyctLess than dew point temperature TdtSo that the water vapor in the air is condensed into water at the semiconductor dehumidifying device to be precipitated.
Preferably, the surface temperature T of the refrigerating end face of the semiconductor dehumidifying componentct＝TdtA, wherein a.gtoreq.5.
Preferably, the wind speed V in the wind channel is measured by the wind speed detection device and fed back to the control system, and the control system calculates the dehumidification time t by the following formula2；
t2＝3200-250V；
In the formula: t is t2Setting the dehumidification time; v is the wind speed in the wind channel measured by the wind speed detection device.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention provides an air conditioner for a railway vehicle and a dehumidification method thereof.A phase change cold accumulation device is arranged in an air duct of the air conditioner, a semiconductor dehumidification device is arranged between the inlet end of the phase change cold accumulation device and the inlet end of the air duct, a temperature and humidity detection device is also arranged in the air duct, and the temperature T collected at the semiconductor dehumidification device is detected by the temperature and humidity detection devicectTemperature T of phase change cold storage devicewtAnd dew point temperature TdtAnd sending the detected temperature to a control system, wherein the control system judges the temperature T at the phase change cold accumulation devicewtCorresponding to the dew point temperature TdtThe size of the gap controls whether the semiconductor dehumidifying device carries out dehumidifying operation. Temperature T at the phase change cold storage devicewtLess than dew point temperature TdtWhen the semiconductor dehumidifier is started to operate and dehumidify, the water vapor in the air is cooled into water at the semiconductor dehumidifier and removed, so that the dew point temperature T is reacheddtDecrease until TwtGreater than TdtTherefore, the condition of quitting dehumidification is achieved, the control system controls the semiconductor dehumidification device to be closed, and the dehumidification work is finished. By adopting the structure and the method, the dew point temperature T of the air flowing through the phase change cold storage devicedtLess than TwtThe air can not be condensed into water at the phase change cold accumulation device, thereby solving the technical problem that the condensation is easy to occur on the surface of the cold accumulation device to affect the cold discharge rate and the effect of the cold accumulation device in the prior art.
Drawings
FIG. 1 is a simplified structural diagram of a phase change cold storage device and a semiconductor dehumidification device in an air conditioning duct according to the present invention;
fig. 2 is a flow chart of an air conditioning and dehumidifying method for a railway vehicle according to the present invention.
In the above figures: 1. an air duct; 2. a phase change cold storage device; 3. a semiconductor dehumidification device; 4. a water accumulation container. 5. Wind speed detection device
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or through an intermediary profile. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The technical scheme in the embodiment of the application is for solving the technical problem that the surface of the cold accumulation device is easy to dewfall and affects the cold discharge rate and the effect of the cold accumulation device in the prior art, and the general idea is as follows:
the invention provides an air conditioner for a railway vehicle and a dehumidification method thereof.A phase change cold accumulation device 2 is arranged in an air duct 1 of the air conditioner, a semiconductor dehumidification device 3 is arranged between the inlet end of the phase change cold accumulation device 2 and the inlet end of the air duct 1, a temperature and humidity detection device is also arranged in the air duct 1, and the temperature T collected at the position of the semiconductor dehumidification device 3 is detected by the temperature and humidity detection devicectTemperature T of phase change cold storage device 2wtAnd dew point temperature TdtAnd sends the detected temperature to a control system which judges the temperature T at the phase change cold storage device 2wtCorresponding to the dew point temperature TdtThe size of the gap controls whether the semiconductor dehumidifying device 3 performs dehumidifying operation. Temperature T at the phase change cold storage device 2wtLess than dew point temperature TdtAt the same time, the semiconductor dehumidifying device 3 starts to operate and dehumidify, so that the water vapor in the air is cooled into water at the semiconductor dehumidifying device 3 and removed, and the dew point temperature T is reacheddtDecrease until TwtGreater than TdtTherefore, the condition of quitting dehumidification is achieved, the control system controls the semiconductor dehumidification device 3 to be closed, and the dehumidification work is finished. By adopting the structure and the method, the dew point temperature T of the air flowing through the phase change cold storage device 2dtLess than TwtNamely, the air can not be condensed into water at the phase change cold accumulation device 2, thereby solving the technical problem that the surface of the cold accumulation device in the prior art is easy to generate dewing to affect the cold release rate and the effect of the cold accumulation device.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The application provides an air conditioner for rail vehicle, it includes control system, wind channel 1, be provided with phase transition cold-storage device 2, semiconductor dehydrating unit 3, temperature and humidity detection device in the wind channel 1, dehydrating unit is located between cold-storage device entry end and the 1 entry end in wind channel, and cold-storage device, dehydrating unit, temperature and humidity detection device all carry out the electricity with control system through DC power supply and be connected.
Specifically, the phase change cold accumulation device 2 comprises a cold accumulation and heat exchange module, and the cold accumulation module comprises a plurality of phase change cold accumulation and heat exchange units with the same structure; the structure of a plurality of phase change cold-storage heat exchange units is matched with the structure of the air duct 1 of the vehicle, so that the phase change cold-storage heat exchange units can be uniformly distributed in the air duct 1 of the vehicle. After the temperature of the phase change cold accumulation heat exchange unit is determined, the cold filling and the cold discharging of the phase change cold accumulation heat exchange unit are only related to the temperature of air passing through the phase change cold accumulation heat exchange unit, and other control components are not needed to participate in control. When the temperature of the air passing through the cold accumulation equipment is lower than the phase change temperature of the phase change cold accumulation heat exchange unit, the cold accumulation equipment is cold-charged and keeps a cold accumulation state; when the air temperature passing through the cold accumulation equipment is higher than the phase change temperature of the phase change cold accumulation heat exchange unit, the cold accumulation equipment is cooled to absorb the heat of the air and reduce the air temperature. Thereby serving to exchange heat with the gas in the air duct 1 so that the temperature of the gas flowing out of the air duct 1 is kept constant. Simultaneously, set up the mount, place the cold-storage module in a plurality of holding layers of mount, then put into the wind channel 1 of vehicle to this has increased the area of cold-storage heat transfer, and more effectual temperature rise rate that delays in the car has solved among the prior art when the EMUs lost power supply etc. trouble condition, and the unable normal refrigeration of air conditioning unit leads to the technical problem that the temperature rose fast in the closed carriage. However, when the humidity of the air is high, condensation occurs on the surface of the cold storage device, water vapor in the air precipitates and generates condensed water, which affects the cooling rate and cooling effect of the cold storage device, and the precipitated condensed water stays in the air supply duct 1 of the air conditioner, which adversely affects the environment in the vehicle and the operation of the air conditioning system. In order to solve this problem, the semiconductor dehumidifying apparatus 3 is provided in the duct 1 of the air conditioner.
Specifically, the semiconductor dehumidification device 3 comprises a power supply switch and a semiconductor dehumidification component. And the power supply switch and the semiconductor dehumidification assembly are electrically connected with the control system through a direct current power supply. In the embodiment, the semiconductor dehumidification module is preferably powered by a vehicle-mounted storage battery through direct current, and can be provided with a direct current power supply. The control system controls the working state of the semiconductor dehumidification component by controlling the power supply switch. More specifically, the semiconductor dehumidification assembly comprises a semiconductor refrigeration end face and a semiconductor heating end face, a cold-end-face energy taking device and a water collecting container are arranged at the semiconductor refrigeration end face, and the water collecting container is used for collecting condensed water formed after dehumidification.
Through adopting above structure for the air that flows through phase change cold-storage device 2 department dehumidifies in advance, makes the vapor content in the air reduce promptly, has effectually improved the dewfall phenomenon of phase change cold-storage device 2 department from this. Specifically, the temperature T at the phase change cold storage device 2wtLess than dew point temperature TdtAt the same time, the semiconductor dehumidifying device 3 starts to operate and dehumidify, so that the water vapor in the air is cooled into water at the semiconductor dehumidifying device 3 and removed, and the dew point temperature T is reacheddtDecrease until TwtGreater than TdtTherefore, the condition of quitting dehumidification is achieved, the control system controls the semiconductor dehumidification device 3 to be closed, and the dehumidification work is finished. By adopting the structure, the dew point temperature T of the air flowing through the phase change cold storage device 2dtLess than TwtNamely, the air can not dew at the phase change cold accumulation device 2, thereby solving the technical problem that the surface of the cold accumulation device in the prior art is easy to dew to affect the cold release rate and the effect of the cold accumulation device.
Meanwhile, in the whole cold release time period of the phase change cold accumulation device 2, the cold release and the outer surface temperature change can be divided into two time periods, the cold release is fast in the front period, the outer surface temperature is low, and the air flows through the outer surface and is easy to dewfall; in the later period, most of the cold storage amount of the phase change cold storage device 2 is released, so that the cold release is slow, the temperature of the outer surface is gradually raised, and at the moment, the air flows through the outer surface and is not easy to dewfall. After a certain time (related to the cold storage capacity and the cold release rate of the phase change cold storage device), the cooling effect of the phase change cold storage device 2 is gradually weakened until no cold is released. According to the actual cold discharge characteristic of the phase change cold storage device, the control system adjusts the preset fresh air dehumidification time t2So that the dehumidifying operation time reaches t2In the process, the wall surface of the tail section of the phase change cold accumulation device reaches a higher temperature, and the condensation condition is not met, so that the dehumidification operation is not needed, namely, the fresh air semiconductor dehumidification device stops operating, and therefore the energy consumption of the whole system can be reduced. In order to satisfy the above operating conditions, a timer (not shown) is further provided in the present embodiment, and the timer is disposed on the phase change cold storage device 2 and is used for recording the working duration of the phase change cold storage device 2 and feeding back the information of the working duration to the control system.
Specifically, when the phase change cold storage device 2 starts to work, the control system controls the start of the timer, and the timer is cleared and starts to record the running time t of the phase change cold storage device 21When running time t1The time t for controlling the preset dehumidification in the system is reached2Thereafter, the controller forcibly turns off the semiconductor dehumidifying device 3, at which time the signal of the temperature/humidity detecting device is no longer read in, and the semiconductor dehumidifying device 3 cannot be controlledThe emergency power supply is started, so that the power consumption of the whole system is reduced by adopting the structure, and the electric quantity of the emergency power supply is saved. Meanwhile, if the shutdown condition of the semiconductor dehumidifying apparatus 3 is satisfied before the preset dehumidifying operation time is reached, the semiconductor dehumidifying apparatus 3 also stops operating.
Further, a wind speed detection device 5 is further provided in this embodiment, and the wind speed detection device 5 is disposed at the end of the wind channel and is used for testing the wind speed in the wind channel and controlling the dehumidification time by testing the wind speed in the wind channel. The release rate of cold energy in the phase change cold storage device is directly influenced by the wind speed in the wind channel, and the greater the wind speed is, the faster the cold energy in the phase change cold storage device is released; the lower the wind speed, the slower the cold energy in the cold storage device is released, and therefore, the preset dehumidification time t2The dehumidification time can be accurately adjusted according to specific environments by setting the structure, so that the dehumidification effect is better, and the consumption of a direct current power supply can be reduced.
As shown in fig. 2, an embodiment of the present invention further provides an air conditioning and dehumidifying method for a rail vehicle, where the dehumidifying method specifically includes:
when the air conditioning system of the railway vehicle breaks down, the phase change cold accumulation device 2 starts to release cold energy;
the temperature and humidity detection device starts temperature information acquisition and acquires the wall temperature T of the tail section of the cold accumulation device in the air duct 1 in real timewtSurface temperature T of refrigerating end face of semiconductor dehumidifying componentctDew point temperature TdtSending the data to the control system; and Twt、Tct、TdtAll constantly changing over time.
Control system for dew point temperature TdtThe temperature T of the wall surface of the tail section of the phase change cold accumulation device 2wtJudging the size of the sample:
if Twt>TdtAt this time, dehumidification is not required, that is, the power supply switch of the semiconductor dehumidifier 3 is turned off, and the semiconductor dehumidifier 3 is in a non-operating state.
In particular, becauseThe dew point temperature is the temperature at which the air is cooled to saturation without changing both the moisture content and the air pressure. In a manner of speaking, the temperature at which water vapor in the air turns into dew is called the dew point temperature. When the water vapor in the air is saturated, the air temperature is the same as the dew point temperature; when the water vapor is not saturated, the air temperature is higher than the dew point temperature. I.e. the temperature of the air falls below the dew point, is a necessary condition for condensation of water vapor. Therefore, when the temperature T of the wall surface of the tail section of the phase change cold accumulation device 2wtGreater than dew point temperature TdtAt this time, there is no dew condensation phenomenon in the air at the phase change cold storage device 2, and at this time, dehumidification is not required, that is, the power supply switch of the semiconductor dehumidification device 3 is in the off state, and the semiconductor dehumidification device 3 is in the non-operating state.
If Twt≤TdtThe semiconductor dehumidifying apparatus 3 starts to operate. The control system regulates the current flowing to the semiconductor component by controlling the power supply switch, so that the surface temperature T of the refrigerating end face of the semiconductor dehumidifying componentct<Tdt. Specifically, in this embodiment, the surface temperature of the cooling end face of the semiconductor dehumidification module is adjusted to Tct＝TdtA is more than or equal to 5, so that the requirement of instantaneous dehumidification is met, namely, the air can be instantaneously dehumidified when flowing through the semiconductor dehumidification device 3, and the surface temperature T of the refrigeration end face of the semiconductor dehumidification component is preventedctAnd dew point temperature TdtThe difference is too small to allow the air to be effectively dehumidified while passing through the dehumidifying apparatus, thereby further enhancing the dehumidifying effect by the above method.
Because the temperature of the wall surface of the tail section of the phase change cold accumulation device 2 is lower than the dew point temperature, the condensation condition of water vapor in the air is met, the power supply switch of the semiconductor dehumidification device 3 is turned on, and the semiconductor dehumidification device 3 starts to operate. The control system controls the power supply of the direct-current power supply to the semiconductor dehumidifying device by controlling the power supply switch, so that the surface temperature T of the refrigerating end face of the semiconductor dehumidifying componentct<TdtBecause the surface temperature of the semiconductor refrigeration end surface is lower than the dew point temperature, when air flows through the semiconductor refrigeration end surface, the air is condensed and condensed into water to be separated out, and the water vapor in the air is mixed with the water vaporThe humidity in the air is gradually reduced, so that the dew point temperature T in the air is reduceddtGradually decreases until the dew point temperature TdtLess than the temperature T of the wall surface of the tail section of the phase change cold accumulation device 2wt。
Specifically, after the semiconductor dehumidifying device 3 operates for a period of time, the temperature and humidity detecting device detects the temperature, and the control system judges the wall temperature T of the tail section of the cold storage devicewtWhether it is greater than dew point temperature Tdt：
If Twt≤TdtThe semiconductor dehumidifying device 3 continues to dehumidify;
if Twt>TdtThe semiconductor dehumidifying apparatus 3 stops operating and completes the dehumidification.
Further, since the whole phase change cold accumulation device 2 has the advantages that the cold accumulation is fast in the front section time, the temperature of the outer surface is low, and the air flows through the outer surface and is easy to dewfall; the air is slowly cooled in the later period, the temperature of the outer surface is gradually raised, and at the moment, the air is not easy to dewfall when flowing through the outer surface of the phase change cold accumulation device 2. According to the actual cold discharge characteristic of the phase change cold storage device, the control system adjusts the preset fresh air dehumidification time t2So that the actual operation time reaches t2In the process, the wall surface of the tail section of the phase change cold accumulation device reaches a higher temperature, and the condensation condition is not met, so that the dehumidification work is not needed, and the energy consumption of the whole system can be reduced. In order to reduce the energy consumption of the whole system, the embodiment provides a timing control method.
Specifically, when the phase change cold storage device 2 starts to operate, the control system controls a timer to start, the timer is cleared and starts to record the operation time t of the phase change cold storage device 21(ii) a The preset dehumidification time in the control system is t2；
If t1<t2And Twt≤TdtThe semiconductor dehumidifying device 3 continues to dehumidify;
if t1<t2And Twt>TdtThe semiconductor dehumidifying device 3 stops operating and completes dehumidifying;
if t1≥t2And the control system forcibly controls the semiconductor dehumidifying device 3 to be closed, signals of the temperature and humidity detection device are not read in any more, and the air conditioner exits the dehumidifying mode.
Further, wherein the dehumidifying time t is preset2The dehumidification time t is preset and the cold release rate is fast and the cold release time is short, which are related to the cold release rate of the phase change cold storage device2It is short and vice versa. However, the cold release rate of the phase change cold accumulation device is related to the wind speed in the wind channel, the greater the wind speed is, the faster the cold release rate is, and at the moment, the preset dehumidification time t is2And correspondingly shortened, and vice versa. Whereby the preset dehumidifying time t can be further precisely set2And the consumption of the DC power supply can be reduced.
Specifically, the wind speed V in the wind channel is detected by the wind speed detection device 5, the value of V is transmitted to the control system, and the control system sets the preset dehumidification time t by the following formula2：
t2＝3200-250V(1)
In the formula, t2Setting the dehumidification time; v is the wind speed in the wind channel measured by the wind speed detection device.
When the phase change cold accumulation device starts to release cold energy, the control system controls the timer to start, the timer is cleared and starts to record the operation time t of the phase change cold accumulation device 21(ii) a When t is1≥t2And the control system forcibly controls the semiconductor dehumidifying device 3 to be closed.
By adopting the structure and the method, when the air conditioning system can not work normally due to power supply or other abnormal conditions of the railway vehicle, the phase change cold accumulation device 2 starts to release cold energy, and meanwhile, the semiconductor dehumidification device 3 is arranged between the inlet end of the phase change cold accumulation device 2 and the inlet end of the air duct 1, namely the semiconductor dehumidification device 3 is arranged at the front end of the phase change cold accumulation device 2. When the humidity in the air is high, the dew point temperature TdtGreater than the surface temperature T of the tail section of the phase change cold accumulation device 2wtWhen the power supply switch is turned on, the control system controls the semiconductor dehumidifying device 3 to dehumidify, namely, the semiconductor dehumidifying device is dehumidified by adjusting the flow directionInput current at the assembly such that the temperature T of the cooling end face of the semiconductor dehumidifying assemblyctAdjusted to dew point temperature TdtThe air flowing into the air duct 1 can be condensed into water, that is, water vapor in the air is precipitated, when the air passes through the semiconductor dehumidification device 3. Humidity and dew point temperature T in the air after dehumidificationdtReduced and dew point temperature TdtThe surface temperature T of the tail section of the phase change cold accumulation device 2 is reducedwtThe following. Therefore, when the dehumidified air flows through the phase change cold accumulation device 2 again, the condition of condensation is not met, namely, the dehumidified air does not condense and condense when flowing through the phase change cold accumulation device 2 any more, the phenomenon of condensation on the surface of the air flowing through the phase change cold accumulation device 2 is effectively improved, and the technical problem that condensation on the surface of the cold accumulation device easily occurs to influence the cold discharge rate and the effect of the cold accumulation device in the prior art is solved.
Claims (10)
1. An air conditioner for a rail vehicle, comprising:
a control system;
an air duct;
the phase change cold accumulation device is arranged in the air duct;
the semiconductor dehumidifying device is arranged in the air duct and is positioned between the inlet end of the cold accumulation device and the inlet end of the air duct;
the temperature and humidity detection piece is arranged in the air duct and is used for detecting the temperature and the dew point temperature of the phase change cold storage device and the semiconductor dehumidification device;
the semiconductor dehumidification device and the temperature and humidity detection device are electrically connected with the control system;
and the wind speed detection device is arranged at the tail end of the air duct and is used for detecting the wind speed in the air duct of the air conditioner of the railway vehicle.
2. The air conditioner for a railway vehicle as claimed in claim 1, wherein the semiconductor dehumidifying apparatus comprises a power supply switch, a semiconductor dehumidifying module;
the power supply switch and the semiconductor dehumidification assembly are connected with the control system through a direct-current power supply; and the power supply switch is used for controlling the direct current power supply to supply power to the semiconductor dehumidifying component.
3. The air conditioner for a railway vehicle as claimed in claim 2, wherein the semiconductor dehumidification assembly comprises a semiconductor refrigeration end face, a cold end face energy collector and a water collection container are arranged at the semiconductor refrigeration end face, and the water collection container is used for collecting condensed water formed after dehumidification.
4. The air conditioner for a railway vehicle as claimed in claim 1, wherein the temperature and humidity detecting means comprises an air duct inlet sensor, a semiconductor dehumidifying device temperature sensor, a phase change cold storage device temperature sensor.
5. The air conditioner for a railway vehicle as claimed in any one of claims 1 to 4, further comprising a timer disposed on the phase change cold storage device for recording the time period for which the phase change cold storage device starts to operate.
6. A dehumidifying method for an air conditioner of a railway vehicle as claimed in any one of claims 1 to 5,
when the air conditioning system of the railway vehicle breaks down, the phase change cold accumulation device starts to release cold energy;
temperature and humidity detection device collects temperature T of wall surface of tail section of phase change cold storage device in air duct in real timewtSurface temperature T of refrigerating end face of semiconductor dehumidifying componentctDew point temperature TdtSending the data to the control system;
the control system judges the dew point temperature TdtTemperature T of wall surface of tail section of cold accumulation devicewtThe size of (2):
if Twt≧TdtThe semiconductor dehumidifying device is in a non-working state;
if Twt<TdtAnd the semiconductor dehumidifying device starts to operate, and after the dehumidifying condition is achieved, water vapor in the air is condensed into water at the semiconductor dehumidifying device and is separated out.
7. Air conditioning and dehumidification method for railway vehicles according to claim 6,
when the phase change cold storage device starts to operate, the control system controls the timer to be started and starts to record the operation time t of the phase change cold storage device1(ii) a The preset dehumidification time in the control system is t2(ii) a The control system judges the operation time t of the phase change cold storage device1And a preset dehumidification time t2The size of (2):
if t1<t2And Twt≤TdtThe semiconductor dehumidifying device continues to dehumidify;
if t1<t2And Twt>TdtThe semiconductor dehumidifying device stops operating and completes dehumidifying;
if t1≥t2And the control system controls the semiconductor dehumidifying device to be closed, and the air conditioner exits the dehumidifying mode.
8. Air conditioning dehumidification method for railway vehicles according to any one of claims 6 to 7, wherein said dehumidification conditions comprise the surface temperature T of the refrigerated end face of the semiconductor dehumidification assemblyctLess than dew point temperature TdtSo that the water vapor in the air is condensed into water at the semiconductor dehumidifying device to be precipitated.
9. Air conditioning and dehumidification method for railway vehicles according to claim 8, characterized in that said semiconductor dehumidification module has a surface temperature T of the refrigerated end facect＝TdtA, wherein a.gtoreq.5.
10. Air conditioning and dehumidification method for railway vehicles according to claim 6,
the wind speed V in the air channel is measured by the wind speed detection device and fed back to the control system, and the control system calculates the preset dehumidification time t by the following formula2；
t2＝3200-250V；
In the formula: t is t2Setting the dehumidification time; v is the wind speed in the wind channel measured by the wind speed detection device.
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| US4324184A (en) * | 1980-03-24 | 1982-04-13 | Universal Mobility, Inc. | Temperature control system and method for an automated guideway transit system |
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| CN102734900B (en) * | 2011-04-01 | 2014-12-10 | 台达电子工业股份有限公司 | Air conditioner with manual dehumidification function and operating method thereof |
| DE102013224896A1 (en) * | 2013-12-04 | 2015-06-11 | Robert Bosch Gmbh | Method and device for operating a vehicle |
| US20170106721A1 (en) * | 2015-10-15 | 2017-04-20 | Ford Global Technologies, Llc | Energy-efficient vehicle window defogging and prevention of re-freezing |
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| CN110920645B (en) * | 2019-11-01 | 2021-02-26 | 浙江盾安轨道交通设备有限公司 | System and method for dehumidifying train air conditioning unit, computer device and storage medium |
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