JP4646696B2 - Air conditioning apparatus, air conditioning method, air volume control apparatus for air conditioning apparatus, and air volume control method for air conditioning apparatus - Google Patents

Description

The present invention comprises an air conditioning coil and a blower as main components, and in an air conditioner that keeps the temperature of a target room within a certain range, an outside air temperature detector is provided downstream of the outside air intake, and the outside air intake The temperature of the outside air taken in is monitored, and only the outside air temperature information detected by the outside air temperature detector is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to rotate the blower The air volume control unit is configured by an outside air temperature detector, an air volume setting unit, and an inverter so as to control the number , or it is mainly composed of an air conditioning coil and a blower, in the air conditioning method for maintaining the temperature within a certain range, the subsequent stage of the outside air inlet have outside air temperature detection means, to monitor the temperature of outside air taken in from the outside air inlet, an outside air temperature Only the outside air temperature information detected by the detecting means is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower, so that the outside air temperature detecting means, the air volume setting vessels, air-conditioning method characterized by comprising the air volume control means in the inverter or of the air conditioner to maintain the temperature of the target chamber within a certain range, a flow rate control device to be added to the blower, collected outside air An outside air temperature detector for detecting the outside air temperature is provided at the rear stage of the entrance, and only the outside air temperature information from the outside air temperature detector is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter. so as to control the rotational speed of the sent by the blower, outside air temperature sensor, air volume setting device, the air volume control device of the air conditioning apparatus characterized by comprising constituting the air volume control device in inverters, or pairs The blower of the air conditioner to maintain the temperature of the chamber within a certain range, a flow rate control method of adding air volume control means is downstream of the external air inlet have outside air temperature detecting means, external air intake port The temperature of the outside air taken in is monitored, and only the outside air temperature information detected by the outside air temperature detecting means is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to rotate the blower The present invention relates to an air volume control method for an air conditioner, characterized in that an outside air temperature detecting means, an air volume setting device, and an inverter are provided so as to control the number .

  2. Description of the Related Art In recent years, a method for variable flow rate control of an air blower constituting an air conditioner by an inverter has been widely studied and adopted depending on the reduction rate of power consumption. However, the current control method and control device related to the variable frequency control of the inverter of the blower both require large-scale capital investment, and the cost for capital investment is enormous. At present, it is only used in buildings where high-precision air conditioning is required.

In other words, in the current method of controlling the flow rate of the blower with an inverter by using an inverter, special control equipment and expensive control software obtained only by the development of a central monitoring device using computers and specialized control technology are used. The idea that it is indispensable is taking root.

  Therefore, the variable flow rate control of the blower with an inverter is possible at sites such as general buildings and large-scale retail stores other than the newly built large buildings and buildings that require high-precision air conditioning as described above. Even if it is known that this method has a certain amount of energy saving effect, the large amount of cost required for large-scale capital investment has become a foothold, and it has not been widely spread. In particular, the additional introduction of existing buildings into existing air-conditioning systems has not been realized, although the effect has been confirmed.

  In other words, with the current method of variable flow rate control of the blower by an inverter, if an attempt is made to additionally introduce it into an existing building, a major remodeling of the existing air conditioner control circuit is an essential condition. I have to take a system. In other words, it is indispensable that a person who is familiar with computer technology performs design, construction, operation, and maintenance, and it is no exaggeration to say that this is the major cause of the large capital investment costs. is there.

  This point will be described more specifically as follows. FIG. 6 is a circuit diagram of an air conditioner A according to a conventional method in which the flow rate of the blower is controlled by a variable flow rate using an inverter. The air-conditioning unit B, which is the central part of the air-conditioning apparatus A, includes an air-conditioning coil B1, a blower B2, and a humidifier B3. The air whose temperature is adjusted by the air-conditioning coil B1 is humidity-adjusted by the humidifier B3, and the blower B2 The air is blown into the target room R through the air outlet FA.

  On the other hand, an indoor temperature detector T and an indoor humidity detector H are installed at the subsequent stage of the return air port RA of the target room R, and the temperature and humidity of the air recirculated from the return air port RA are monitored. The room temperature information detected by the room temperature detector T is sent to the room temperature setter TC. The room temperature setter TC is, for example, a PID type temperature setter, and a control signal from the room temperature setter TC is sent to the motor M1 to control the opening degree of the valve V1.

The amount of cold water or hot water fed from the cold / hot water feed pipe CH to the air conditioning coil B1 is adjusted by the opening degree of the valve V1, and the temperature of the air passing through the air conditioning coil B1 is controlled. The cold / hot water pipe CH is supplied with cold water or hot water from a refrigerator or a boiler (not shown). The cold water or hot water that has passed through the air conditioning coil B1 is returned to a refrigerator or a boiler (not shown) through the cold / hot water drain pipe RCH.

  The indoor humidity information detected by the indoor humidity detector H is sent to the indoor humidity setter HC. The indoor humidity setting device HC is also a PID type humidity setting device, for example, and a control signal from the indoor humidity setting device HC is sent to the motor M2 to control the opening degree of the valve V2. Thereby, the steam supplied from the steam generator (boiler) (not shown) through the steam supply pipe S is controlled by the opening degree of the valve V2 and is released from the humidifier B3, and the humidity of the air whose temperature is adjusted by the air conditioning coil B1. Adjust.

  In this way, the air whose temperature and humidity are adjusted is blown into the target chamber R from the blower opening FA by the blower B2. In the normal air conditioner A, the air sent to the air conditioning coil B1 is a mixture of air in the target room R taken from the target room R through the return air port RA and outside air taken in through the outside air intake port OA. It is. The air volume of the blower B2 is selected and adopted so as to correspond to the maximum value throughout the year of the sensible heat load generated in the target room R.

  The conventional air conditioner has a circuit configuration as described above, and lacks the mechanism for controlling the air flow rate of the blower B2, that is, the air volume control unit C shown in FIG. 6, and the blower B2 always rotates at the initial rotation speed. It was. In addition, the amount of air blown from the blower B2 is normally set with a margin of 10 to 20% by design with respect to the maximum value of the sensible heat load, and when the sensible heat load of the outside air decreases due to seasonal fluctuations However, since the rotation speed of the blower B2 does not change, a large amount of power is wasted in this portion.

  FIG. 2 shows an example of the ratio of the sensible heat load in the design of the blower. According to this, the sensible heat load due to the outside air accounts for about one-third, which is a major factor in determining the overall sensible heat load, and also shows a large variation from season to season. In other words, it tends to be significantly positive in the summer and greatly negative in the winter. Note that the sensible heat load due to the outside air refers to a sensible heat load due to the air in the target room R being fluctuated by the outside air.

The sensible heat load due to indoor power consumption is the sensible heat load of indoor lighting and electric appliances used indoors, which is as large as 40% of the total, but it is a normal site such as a general office. In large retail stores, etc., it can be considered almost unchanged. Moreover, it can be considered that the sensible heat load by the indoor personnel does not fluctuate so much. Further, the other sensible heat load is, for example, a sensible heat load caused by, for example, a draft or intrusion of outside air due to the entry / exit of personnel, and this does not vary much. In other words, in the design of a blower for an air conditioner used in a normal site, it can be considered that only the sensible heat load due to the outside air is greatly varied. In general, the design is performed with a margin for the total load.

This situation is explained in more detail in FIG. In FIG. 3, the sensible heat load in the design of the blower is compared with the average sensible heat load of each month in actual operation. According to this, the total value of the sensible heat load is 5 In the five months from month to September, especially in July and August. Therefore, it is a usual method to determine the design value of the rotational speed of the blower so as to exceed the total value of the sensible heat load in the two months in the summer by about 20%.

In other words, the design rotational speed of the blower is usually designed so as to have an ability to cope with the condition that the outside air temperature is about 33 ° C. to 35 ° C., but the time that actually requires such a design rotational speed. Is less than 10% of the total annual operating hours. This means that the blower is operated at an excessive number of revolutions for 90% or more of the time throughout the year.

However, since the power consumption of the blower increases and decreases in proportion to the cube of the blown air volume, it has been strongly recognized in recent years that the blower is actually the biggest factor in wasting power consumption in air conditioners. It has become. In addition to the trend of energy saving, how to reduce the power consumption of the blower is now the main focus of designing energy saving air conditioners.

That is, as shown in FIG. 6, an air volume control unit C mainly composed of an inverter C1 that makes the rotation speed of the blower B2 variable and a control device C2 that sends control information to the inverter C1 is provided, and the blower is adapted to various conditions. By adjusting the rotation speed of B2, the power consumption of the blower B2 is suppressed and energy saving is attempted.

In such an air conditioner A, the control device C2 receives various types of information IN, calculates various types of information IN, and sends a control signal to the inverter C1 so as to operate the blower B2 with the minimum necessary air volume. The various information IN includes the room temperature, the air supply temperature, the static pressure in the duct, the damper opening degree, etc., and receives the various information IN and sends a control signal to the inverter C1. The control device C2 is usually equipped with a CPU having a high degree of arithmetic processing capability and is operated by a specially programmed program. Examples thereof are shown in the patent literature below. Patent Document 1 shown below is an example of a control method called a variable air volume control (VAV) method.

Patent Document 1 discloses a system in which an air supply outlet is provided in each room of a controlled area to supply air conditioned from a variable air supply amount adjustment unit to perform air conditioning in each room. A parameter that does not depend on the adjustment unit and that is determined by the deviation between the set temperature and the measured temperature of each room and the operation mode, and the supply air temperature setting value of the air conditioner can be calculated. This is a supply air temperature control device for an air conditioner.

Certainly, according to the control device of Patent Document 1, as described in Patent Document 1, a common parameter that can evaluate the thermal load state was introduced, and the load reset of the entire system was performed according to the value. It is certain that effective control is always possible, and that a simple and clear control method can be adopted.

However, in order to obtain the above effect with the above configuration, a system that automatically performs complex calculations is required, and as described above, a control device with a special configuration with a built-in CPU is required in terms of hardware. Yes, it is necessary to create a special program in terms of software. Also, specialized personnel who can handle sophisticated computer programs are required both in design and construction, and in operation and maintenance.

That is, in order to introduce the air conditioner equipped with the control device of Patent Document 1, it is necessary to prepare for large-scale capital investment, securing of specialized personnel, and a large amount of expenses required for it. In addition, it is impossible to add a control device of Patent Document 1 by slightly modifying an existing air conditioning system. In this case, a large amount of remodeling must be expected, which again requires a large amount of money. End up.

Thus, for example, even if it is known that a system such as the control device of Patent Document 1 has a large energy saving effect, considering large-scale capital investment, securing specialized personnel, and a large amount of cost required for it The current situation is that it is not possible to complete the introduction. Especially for sites such as general offices and large-scale retail stores that do not require so much constant temperature and humidity, no matter how much energy is saved, the above-mentioned costs are high for initial investment, maintenance, and securing personnel. In such a system, the balance of payments did not match, and the energy-saving measures by controlling the blower were as far away as the spear drawn in the picture.

Moreover, in an actual site, there is an overwhelming majority of places where a certain degree of temperature control should be maintained without requiring strict constant temperature and humidity. Therefore, in such a field, while the energy-saving effect of advanced control systems is fully appreciated, in reality, there are many places where it is not possible to break away from the previous air conditioning system that continues to rotate the blower at the design speed throughout the year. Currently, air conditioning systems equipped with advanced control systems are only slightly adopted in newly built large-scale buildings or on-site requiring strict temperature and humidity.

  Furthermore, the invention of the following patent document 2 filed by the applicant of the present application is also a kind of air volume control. The difference between the invention of this patent document 2 and the object of the present invention is as described below. is there.

  That is, in the invention of Patent Document 2 below, the temperature of the air produced by the air conditioner (air conditioning coil) is fixed by the air supply temperature setting device, and the blowing capacity of the blower is a value commensurate with the indoor load by the indoor temperature setting device and the inverter. An air conditioning apparatus and an air conditioning method capable of realizing a significant reduction in power consumption with a simple configuration by maintaining the target room at a constant temperature by controlling to the above are provided.

  The invention of the following Patent Document 2 intends that expensive hardware and software are indispensable because the conventional variable air volume control (VAV) system employs an extremely complicated control system for controlling the air volume of the blower. In this respect, it can be said that the intended purpose of the present invention has been achieved to some extent.

  However, in the invention of Patent Document 2 below, for example, when this is to be added to an existing air conditioner, the existing air conditioner is usually a system that controls the temperature of the air produced by the air conditioning coil based on room temperature information. This must be modified to control the air volume of the blower according to the indoor temperature information. Such a modification is much simpler and costs less investment compared to the introduction of the conventional variable air volume control (VAV) method. However, changing the configuration of the existing system still requires some effort. Will take.

  Therefore, in the present invention, the configuration of the existing air conditioner is kept as it is, and a simple configuration for controlling the air flow of the blower is simply added to the conventional air volume control (VAV) system. The aim is to develop a control device or control method that can achieve substantially the same effect.

  And this background is also called “on-site request”. That is, what is highly desired in many sites where an expensive variable air volume control (VAV) system cannot be introduced is to keep the configuration of the existing air conditioner as much as possible, and to simply provide a control device with a simple configuration for the blower. It is the development of such a control device or control method in which the air volume control of the blower can be performed only by adding, and an energy saving air conditioner is realized.

  In other words, the central part of the conventional control method for air conditioners, in which the air conditioning coil is controlled by the room temperature information and the humidifier is controlled by the room humidity information, is kept as it is. It is possible to realize energy saving by controlling the air volume of the blower that has continued to be controlled with a simple control method.

The present invention has developed a blower control device or control method that can be easily added and introduced at as low a cost as possible in response to many demands in the actual field, thereby realizing an energy-saving air conditioning device or air conditioning method. It was developed for the purpose.
JP 2004-125296 A Japanese Patent Application No. 2004-280929 Yamatake Co., Ltd. “Easy automatic control chapter 4 PID control”, [online], September 1, 2004, Yamatake Co., Ltd. [search September 16, 2004], Internet <URL: http //www.compoclub.com/jidou-seigyo/jidou-seigyo4.html>

From the technical background described above, the subject of the present invention was set as follows.
<Problem 1>
In air conditioner control of the number of rotations of the blower, that is, air volume control, no expensive hardware or software is used, and no specialized information processing personnel are required. A control device or control method that can be obtained is developed, and an air-conditioning device or air-conditioning method using the control device or control method is realized.

<Problem 2>
At that time, it is an object to use only the outside air temperature that has not been noticed so far as the control information. In other words, up to now, the room temperature, the air supply temperature, the static pressure in the duct, the damper opening, etc. were naturally used as control information, resulting in a system requiring expensive hardware or software. Reflecting on this, we focused only on the temperature of the outside air. As described above, the sensible heat load of the air in the target room due to factors other than the outside air temperature does not vary very much, but the sensible heat load due to the temperature of the outside air varies greatly and is the most significant sensible heat load in the air conditioner. It is an element. Therefore, it was thought that the maximum effect could be achieved with a very simple system if only the fluctuation of the temperature of the outside air was used as control information.

<Problem 3>
And, in view of the fact that there are many voices in the actual site that want to realize an energy-saving air conditioner by simply adding the air volume control device of the blower without modifying the configuration of the existing air conditioner as much as possible. The air conditioning coil is controlled by the room temperature information that is the core of the existing air conditioner configuration, and the humidifier is controlled by the room humidity information. The development is focused on the simple configuration.

The present invention has been made to solve the above-described problems, and provides the following solution.
<Solution 1>
In an air conditioner that is mainly composed of an air conditioning coil and a blower and keeps the temperature of the target room within a certain range, an outdoor air temperature detector is provided at the rear stage of the outdoor air intake, and is taken in from the external air intake. The outside air temperature is monitored, and only the outside air temperature information detected by the outside air temperature detector is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower. As described above, an air volume control unit is constituted by an outside air temperature detector, an air volume setting device, and an inverter .
<Solution 2>
In the air conditioning method that is mainly composed of an air conditioning coil and a blower and keeps the temperature of the target room within a certain range, it has an outside air temperature detecting means at the subsequent stage of the outside air inlet, and is taken in from the outside air inlet. The outside air temperature is monitored, and only the outside air temperature information detected by the outside air temperature detecting means is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower. As described above, an air- conditioning method characterized in that an outside air temperature detecting means, an air volume setting device, and an inverter are provided with air volume control means .
<Solution 3>
An air volume control device that is added to a blower of an air conditioner that keeps the temperature of a target room within a certain range, and is provided with an outside air temperature detector that detects an outside air temperature at a stage subsequent to the outside air intake, Only the outside air temperature information from the outside air temperature detector is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower, so that the outside air temperature detector and the air volume setting device. An air volume control device for an air conditioner, wherein the air volume control device is constituted by an inverter .
<Solution 4>
An air volume control method in which an air volume control means is added to a blower of an air conditioner that keeps the temperature of a target room within a certain range, and has an outside air temperature detection means at a stage subsequent to the outside air intake, The temperature of the outside air taken in from the inlet is monitored, and only the outside air temperature information detected by the outside air temperature detecting means is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to An air volume control method for an air conditioner comprising an outside air temperature detecting means, an air volume setting device, and an inverter so as to control the rotation speed .

  The present invention does not require any expensive hardware or software for controlling the air blowing capacity of the air conditioner blower, and does not require any specialized personnel for information processing. Thus, energy saving of the blower, that is, a significant reduction in power consumption of the blower can be realized.

  That is, only the temperature of the outside air is the element that controls the blowing capacity of the blower. Therefore, in order to control the inverter of the blower, only a detector for detecting the outside air temperature and a temperature setting device with a simple structure are sufficient. . As this temperature setting device, a simple configuration such as a commercially available PID auto-tuning digital indicating controller is sufficient. For the PID auto-tuning digital indicating controller, refer to Non-Patent Document 1 of the previous term.

  Since no expensive hardware or software is required, no specialized personnel handling expensive hardware or software are required. That is, the present invention can be sufficiently designed, constructed, operated and maintained by personnel having knowledge of ordinary air conditioning equipment. Accordingly, the capital investment cost is negligible, and an air conditioner with extremely high cost performance can be realized.

In addition, it is one of the great effects of the present invention that it is very easy to add and configure only the control device part to the existing air conditioning equipment. In other words, the air conditioning coil is controlled by the room temperature information, which is the core of the existing air conditioner, and the humidifier is controlled by the room humidity information. Air conditioners with advanced energy-saving effects can be realized simply by adding them, so it is possible to fully respond to the voices of many sites that want to achieve energy-saving effects without modifying the existing air-conditioning apparatus as much as possible. Is.

  Therefore, the present invention provides a simple and efficient blower speed control device or control method in many sites that do not require strict temperature and humidity, that is, small and medium-sized factories, offices, and large-scale retail stores. Alternatively, it can be widely used as an air conditioner or an air conditioning method incorporating a rotation speed control device or a control method of a blower. In particular, since it can be easily added to an existing air conditioner as described above, its application range is expected to be extremely wide.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings. The first embodiment described below is one embodiment of the invention of the solving means 1 of the present invention. However, if only the air volume control unit of the first embodiment is taken up, it becomes one embodiment of the invention of the solving means 3. It is.

  FIG. 1 is a circuit diagram of an air conditioner 1 according to the first embodiment. The air conditioning unit 2, which is the central part of the air conditioner 1, includes an air conditioning coil 21, a blower 22, and a humidifier 23. The air whose temperature has been adjusted by the air conditioner 21 is humidity-adjusted by the humidifier 23, and the blower 22. The air is blown into the target room R through the air outlet FA.

  On the other hand, an indoor temperature detector T1 and an indoor humidity detector H are installed downstream of the return air port RA of the target room R, and the temperature and humidity of the air recirculated from the return air port RA are monitored. The room temperature information detected by the room temperature detector T1 is sent to the room temperature setter TC. The room temperature setter TC is, for example, a PID type temperature setter, and a control signal from the room temperature setter TC is sent to the motor M1 to control the opening degree of the valve V1.

The amount of cold water or hot water fed from the cold / hot water feed pipe CH to the air conditioning coil 21 is adjusted by the opening degree of the valve V1, and the temperature of the air passing through the air conditioning coil 21 is controlled. The cold / hot water pipe CH is supplied with cold water or hot water from a refrigerator or a boiler (not shown). The cold water or hot water that has passed through the air conditioning coil 21 is returned to a refrigerator or boiler (not shown) through the cold / hot water drain pipe RCH.

  The indoor humidity information detected by the indoor humidity detector H is sent to the indoor humidity setter HC. The indoor humidity setting device HC is also a PID type humidity setting device, for example, and a control signal from the indoor humidity setting device HC is sent to the motor M2 to control the opening degree of the valve V2. Thereby, the steam supplied from the steam generator (boiler) (not shown) through the steam supply pipe S is controlled by the opening degree of the valve V2 and is released from the humidifier 23, and the humidity of the air whose temperature is adjusted by the air conditioning coil 21. Adjust. In this way, the air whose temperature and humidity are adjusted is blown into the target chamber R from the blower port FA by the blower 22.

  On the other hand, an outside air temperature detector T2 is provided downstream of the outside air inlet OA to monitor the temperature of the outside air taken in from the outside air inlet OA. The outside air temperature information detected by the outside air temperature detector T2 is sent to the air volume setting device 31. The air volume setting device 31 is, for example, a PID air volume setting device, and a control signal from the air volume setting device 31 is sent to the inverter 32 to control the rotational speed of the blower 22. The outside air temperature detector T2, the air volume setting device 31, and the inverter 32 constitute the air volume control unit 3.

  Therefore, in the air conditioner 1 of the first embodiment, the control of the amount of cold / hot water sent to the air conditioning coil 21 is performed based on the room temperature information of the target room R as before, and the control of the amount of steam sent to the humidifier 23 is also targeted as before. Although it is performed by the indoor humidity information of the room R, the point that the rotational speed control of the blower 22 is performed only by the outside air temperature information is a point that is decisively different from the conventional air volume control method. Expensive hardware and software and information processing specialists are not required in the control system, and the inverter 32 is controlled only by the air volume setting device 31 with a simple configuration, which is sufficient for a site that does not require strict temperature and humidity control. The air volume control of the blower 22 can be realized.

  The air volume control method in the air conditioner of the first embodiment will be described in more detail as follows. FIG. 4 is a graph showing the correlation between the outside air temperature and the amount of air blown by the blower 22. When the outside air temperature is t1 ° C. (about 24 ° C. in FIG. 4) or less, the blower 22 is operated at 60% of the maximum air flow. Is set to This is because even when the sensible heat load due to the outside air decreases due to a decrease in the outside air temperature, the maximum ventilation volume of 50 is usually set as the minimum ventilation volume of the blower 22 due to factors such as ensuring the minimum indoor ventilation volume and maintaining the indoor pressure. It is set in this way because it is necessary to hold ~ 70%.

When the outside air temperature exceeds t1 ° C., the air volume of the blower 22 rises substantially linearly as shown in FIG. 4, and reaches the maximum air volume when the outside air temperature reaches t 2 ° C. (about 31.5 ° C. in FIG. 4). At a temperature of t2 ° C. or higher, the engine is operated with the maximum air flow rate. Since the time when the outside air temperature exceeds t2 ° C. is considered to be about 10 to 20% of the total operation time throughout the year, the air conditioner 1 of Example 1 blows 80 to 90% of the annual operation time. It means that energy-saving operation can be performed. In Example 1, t2 ° C. is set to about 31.5 ° C. with a slight margin from a normal air conditioner. If this t2 ° C. is set to 33 to 35 ° C. like a normal air conditioner, As described above, energy saving operation can be performed for the blower in a time exceeding 90% of the annual operation time.

The energy saving in the blower is actually a reduction in the power consumption of the blower consumed to rotate the blower, so the relationship between the blower power consumption and the outside air temperature is shown in the graph of FIG. did. As described above, the increase / decrease in the power consumption of the blower is proportional to the cube of the blown air amount. Therefore, if the power consumption at the maximum blown air amount is 100%, the blower power consumption when the outside air temperature is t1 ° C. or lower. The amount is less than 30%, and it is clear that a significant reduction in power consumption has been realized. As the outside air temperature rises from t1 ° C., the blower power consumption increases in a curve (substantially cubic curve) as shown in FIG. 5 and reaches 100% when the outside air temperature reaches t2 ° C.

In this way, in the state of FIG. 4, even if it does not seem to save much energy, a significant reduction in the actual power consumption of the blower is realized as shown in FIG. In sites where constant humidity is not required, if such a reduction in power consumption is realized, it can be said that the benefits of introduction are very large, with only a small initial investment.

As described above, in the air conditioner 1 of the first embodiment, significant energy saving can be achieved only by controlling the blower 22 only with the outside air temperature information, but the air volume control unit 3 in the air conditioner 1 of the first embodiment is only this. It is also a great feature that can be easily added to most existing air conditioners. That is, the air volume control unit 3 is an embodiment of the invention of the solution 3 of the present invention as it is, and an old air conditioner that would always rotate the blower at the maximum output until now also has the air volume control unit 3 added. It is possible to save a lot of energy just by doing. Moreover, the additional work is simple, and even an air conditioning engineer who has no special knowledge about information processing can implement it without any problems.

  It can be said that the present invention has a very wide range of applications as it can achieve a large energy saving with a simple configuration. That is, the present invention relates to a building such as a hotel or hospital where the sensible heat load in air conditioning is greatly influenced by the temperature of the outside air, an underground shopping center, and a department store or a supermarket where the fluctuation of the indoor power consumption load is small during business hours. As a very simple variable air volume control method for air conditioners at large-scale retail stores and factories and business offices where strict temperature and humidity are not required, it is widely used as a low-cost and large energy-saving effect. Application development is expected.

It is a circuit diagram of the air conditioner of Example 1 of the present invention. It is a graph which shows the ratio of the sensible heat load on the design of the air blower of the conventional air conditioner. It is a graph which shows the fluctuation | variation of the annual sensible heat load of the air blower of the conventional air conditioner. It is a graph which shows the correlation of the ventilation volume of the air blower of the air conditioner of Example 1 of this invention, and external temperature. It is a graph which shows correlation with the air-blower power consumption of the air blower of Example 1 of this invention, and external temperature. It is a circuit diagram of an example of the conventional air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Air conditioning part 21 Air conditioning coil 22 Blower 23 Humidifier 3 Air volume control part 31 Air volume setting device 32 Inverter A Air conditioner B Air conditioning part B1 Air conditioning coil B2 Blower B3 Humidifier C Air volume control part CH Cold / hot water water pipe C1 Inverter C2 Control device FA Air outlet H Indoor humidity detector HC Indoor humidity setter IN Various information M1 motor M2 motor OA Outside air intake R Target room RA Return air outlet RCH Cold / hot water drain pipe S Steam supply pipe T Indoor temperature detector T1 Indoor temperature Detector T2 Outside air temperature detector TC Indoor temperature setting device V1 valve V2 valve t1 outside air temperature t2 outside air temperature

Claims (4)

In an air conditioner that is mainly composed of an air conditioning coil and a blower and keeps the temperature of the target room within a certain range, an outdoor air temperature detector is provided at the rear stage of the outdoor air intake, and is taken in from the external air intake. The outside air temperature is monitored, and only the outside air temperature information detected by the outside air temperature detector is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower. As described above, an air volume control unit is constituted by an outside air temperature detector, an air volume setting device, and an inverter . In the air conditioning method that is mainly composed of an air conditioning coil and a blower and keeps the temperature of the target room within a certain range, it has an outside air temperature detecting means at the subsequent stage of the outside air inlet, and is taken in from the outside air inlet. The outside air temperature is monitored, and only the outside air temperature information detected by the outside air temperature detecting means is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower. As described above, an air- conditioning method characterized in that an outside air temperature detecting means, an air volume setting device, and an inverter are provided with air volume control means . An air volume control device that is added to a blower of an air conditioner that keeps the temperature of a target room within a certain range, and is provided with an outside air temperature detector that detects an outside air temperature at a stage subsequent to the outside air intake, Only the outside air temperature information from the outside air temperature detector is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to control the rotation speed of the blower, so that the outside air temperature detector and the air volume setting device. An air volume control device for an air conditioner, wherein the air volume control device is constituted by an inverter . An air volume control method in which an air volume control means is added to a blower of an air conditioner that keeps the temperature of a target room within a certain range, and has an outside air temperature detection means at a stage subsequent to the outside air intake, The temperature of the outside air taken in from the inlet is monitored, and only the outside air temperature information detected by the outside air temperature detecting means is sent to the air volume setting device, and the control signal from this air volume setting device is sent to the inverter to An air volume control method for an air conditioner comprising an outside air temperature detecting means, an air volume setting device, and an inverter so as to control the rotation speed .

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