JPH0914702A - Ice heat storage unit device and operating method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to suppress the amount of ice accretion on the brine header during ice making without making the heat storage tank into a special shape or increase in size, and to sufficiently prevent unmelted ice during melting. (EN) Provided are an ice storage tank unit device and an operating method thereof. [Structure] A heat storage tank 1, a heat transfer tube 4 arranged in the heat storage tank and to which ice is attached, a brine header 3 for injecting a refrigerant into the heat transfer tube, and ice attached to the heat transfer tube. In the ice heat storage unit device, which comprises a water header 2 for injecting water to melt the water, and a water discharge part for guiding the cooling water, which melts the ice adhered to the heat transfer tube, to the air conditioning system, the brine The header 3 was formed in a tubular shape and arranged horizontally, and the water header 2 having a water injection port facing downward was arranged directly above this brine header.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an ice heat storage unit device and its operation method.

[0002]

2. Description of the Related Art As shown in FIG. 11, an ice heat storage unit device of this type that has been generally used in the past has a heat transfer tube 4 for adhering ice to the surface of the heat storage tank 1 and a heat transfer tube 4 for transferring the heat. A brine header 3 for injecting a refrigerant into the heat pipe and a water header 2 for injecting hot water into the heat storage tank 1 are formed. In addition, 5 is a water outlet for guiding the cooled hot water 6 to the air conditioning system, and 7 is a tube support for steadying the heat transfer tube 4. The arrow 6 in the figure indicates the flow of hot water for melting the ice in the heat transfer tube 4.

In the ice heat storage unit device thus formed, in operation, hot water 6 is sprayed from the water header 2 into the heat storage tank 1 to melt the ice adhering to the surface of the heat transfer tube 4. The hot water 6 cooled by heat exchange with ice is led from the water outlet 5 to the air conditioning system and used for cooling. The heat transfer tube 4 has a folded structure as is apparent from the figure, and is arranged in multiple stages in the height direction in order to increase the amount of ice produced.

Examples of the ice heat storage unit device of this type include, for example, JP-A-6-137616 and JP-A-58-145837.

[0005]

In the conventional ice heat storage unit device thus formed, the refrigerant is branched from the brine header to the heat transfer pipe, but the brine header has a larger cross-sectional area than the heat transfer pipe. Thick ice is generated in the brine header during ice making, and the horizontal direction of the heat transfer tubes is generally horizontal.The brine header is arranged vertically in the heat storage tank. It was difficult to control the amount of ice accretion.

Therefore, when the ice around the brine header remains unmelted during the melting of ice, and the ice on the heat transfer tube around the brine header grows during the next ice making, the grown ice comes into contact with the adjacent heat transfer tubes and is transferred to the heat transfer tubes. Excessive stress may be applied and the heat transfer tube may be damaged.

In order to avoid this, if the piping structure is provided with a spatial margin commensurate with the amount of ice accretion of the brine header, an ineffective area, that is, an area where ice cannot be produced increases, and hot water during melting of ice melts. Since most of it flows through the space, the flow of hot water in the heat storage tank cannot be made uniform, and there is a problem that unmelted ice remains in the heat transfer tube.

Further, in order to effectively melt the ice around the brine header, it is possible to arrange the water header in the vertical direction of the heat storage tank as in the case of the brine header. However, this configuration requires the water header. There was a dislike that the same problems as above could occur due to the inability to make the flow of warm water uniform during ice melting due to the space.

The present invention has been made in view of the above, and an object of the present invention is to suppress the ice accretion amount of the brine header during ice making without making the heat storage tank into a special shape or upsizing, and It is an object of the present invention to provide an ice heat storage tank unit device of this type capable of sufficiently preventing unmelted ice from remaining during ice melting, and an operating method thereof.

[0010]

Means for Solving the Problems That is, the present invention provides a heat storage tank, a heat transfer tube arranged in the heat storage tank and having ice adhered thereto, a brine header for injecting a refrigerant into the heat transfer tube, and the heat transfer tube. Ice with a water header for injecting water to melt the ice adhering to the heat pipe, and a water discharge part for guiding the cooling water with the ice adhering to the heat transfer pipe to the air conditioning system In the heat storage unit device, the brine header is formed in a tubular and horizontal arrangement, and the water header having the downward water injection port is arranged directly above the brine header to achieve the intended purpose. It is something that is done.

Further, the brine header is formed in a tubular and horizontal arrangement, the connecting portion between the brine header and the heat transfer tube is provided on the lower surface of the brine header, and the water header is disposed above the brine header. It is something that is done. Further, a heat storage tank, a heat transfer tube arranged in the heat storage tank and to which ice is attached, a brine header for injecting a refrigerant into the heat transfer tube, and in order to melt the ice attached to the heat transfer tube. In a method of operating an ice heat storage unit device, comprising: a water header for injecting water; and a water discharge part for introducing cooling water, which melts ice adhered to a heat transfer tube, to an air conditioning system, It is formed so as to be arranged horizontally, and the water header is arranged directly above this brine header, and at the initial stage of ice making, the water surface position in the heat storage tank is located below the brine header, and when ice making is completed, The operation is performed by setting the positions of the brine header and the water level so that the water level raised by the volume expansion is located above the brine header.

[0012]

In other words, in the ice heat storage unit device thus formed, the water level in the heat storage tank changes in the vertical direction due to the volume expansion associated with the phase change during ice making. Using this change in water level, the water level that was below the brine header in the early stages of ice making was determined to be above the brine header at the end of ice making, and the positional relationship between the initial water level in the heat storage tank and the brine header was determined. In the initial stage, there is no water around the brine header, and the ice does not ice on the brine header, but the water level gradually rises as the heat transfer tube ice accumulates, and when water arrives at the brine header, the ice ice on the brine header will form. Starting, the amount of ice making around the brine header can be suppressed. In addition, since the water header is located immediately above the brine header, the ice accretion around the brine header can be preferentially melted during ice melting, and thus the unmelted ice residue during ice melting is sufficient. Can be prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows a schematic structure of the ice heat storage unit device with a part thereof cut away. The brine header 3 is formed in a tubular shape extending in the horizontal direction, and is arranged above the heat transfer tube group 10. Further, the water header 2 is arranged above the brine header 3. A plurality of heat transfer tubes 11 are vertically arranged in the heat transfer tube group 10, that is, formed so as to meander vertically. The tube support 22 is arranged at the bottom of the heat storage tank 1 to prevent the heat transfer tube 11 from swinging.

2 to 4 show the operating states of the ice heat storage unit device formed in this way. The inside of the brine header 3 and the heat storage tank 1 at the beginning of ice making, at the end of ice making, and at the end of ice melting, respectively. It is the figure which showed the positional relationship with the water level of. At the beginning of ice making, as shown in FIG. 2, the heat storage tank 1
The initial water level 12 is set below the brine header 3 and, at the end of ice making, the water level 13 is determined and operated so that the water level 13 is above the brine header 3 as shown in FIG.

According to this embodiment, the amount of ice making around the brine header 3 can be suppressed during ice making, and the hot water 6 from the cold water header 2 is supplied to the brine header 3 at the time of ice melting.
Thereby, the ice accretion around the brine header 3 can be preferentially melted. In addition, in this example, the heat transfer tube 11 is shown as being formed by a pipe meandering in the vertical direction, but as shown in FIG. Is. Even in this case, the joint between the heat transfer tube 11 and the brine header 3 should be formed on the lower surface of the brine header 3.

That is, in the conventional ice heat storage unit device, since the heat transfer tube 4 is placed horizontally, that is, the connecting portion between the brine header 3 and the heat transfer tube 4 is performed on the side portion of the brine header 3, The weight of the heat pipe 4 is the brine header 3
Bending stress is applied to the joint with and, therefore,
The tube support 7 that supports the weight of the heat transfer tube 4 is shown in FIG.
It is necessary to support the whole heat transfer tube group like. Therefore, the tube support 7 obstructs the flow of warm water during melting of ice. However, when a plurality of heat transfer tubes 11 are vertically arranged as in the present invention, the own weight of the heat transfer tubes 11 is applied vertically downward to the joint portion with the brine header 3 and becomes a tensile stress. Normally, the strength against the tensile stress is much stronger than the bending stress, so that the tube support 22 of the present embodiment only needs to be able to steady the heat transfer tube 11, as shown in FIG.
As shown in, a tooth-shaped comb may be arranged at the bottom of the heat storage tank 1.

By greatly reducing the tube support in this embodiment, the ice adhering to the heat transfer tube 4 can be more uniformly melted when the ice is melted.

FIG. 7 shows a second embodiment of the present invention. In this embodiment, in the meandering heat transfer tube 16, an inclination is provided between the hairpin portions. According to this embodiment, the amount of ice making around the brine header 3 can be suppressed at the time of ice making, and at the time of ice melting, the warm water 6 from the cold water header 2 gives priority to icing around the brine header 3. It can be melted together and air can be collected in the upper part of the heat transfer tube 16 without accumulating in each hairpin part.

FIG. 8 shows a third embodiment of the present invention. The upper side of the figure is a diagram showing the positional relationship between the initial ice making level 12 and the brine headers 20 and 21 of this embodiment, and the lower side is a horizontal cross section at the position 30 at the end of ice making of this embodiment. There is. In this example, two systems of the brine header 20 on the refrigerant inlet side and one system of the brine header 21 on the refrigerant outlet side are arranged. Considering that the amount of icing ice 18 on the inlet side of the refrigerant increases and the amount of icing ice 19 on the outlet side of the refrigerant decreases, the heat transfer tubes 17 are inverted in the front-rear direction to form a heat transfer tube group.

In this embodiment, not only the same effects as those of the above-mentioned embodiment are achieved, but also the effect of increasing the filling rate of ice is obtained. In addition, the brine header 20 on the refrigerant inlet side
The same effect can be obtained by using two systems and the brine header 21 on the refrigerant outlet side as two systems.

FIG. 9 shows a fourth embodiment of the present invention. In this embodiment, the heat transfer tubes 23 are vertically arranged in a staggered arrangement in order to increase the filling rate of ice. The refrigerant inlet side brine header 20 is one system, and the outlet side brine header 21 is
Is an example of one system. FIG. 10 shows the tube support 24 used in this embodiment. Since the lowermost part of the heat transfer tube 23 is staggered vertically, the height of the receiving portion of the heat transfer tube 23 of the tube support 24 is changed according to the height.

According to this embodiment, in addition to the same effects as the above embodiments, the effect of increasing the filling rate of ice can be obtained.
Similar effects can be obtained even if the refrigerant inlet-side brine header 20 and the refrigerant outlet-side brine header 21 are provided as two systems and one system, and two systems and one system, respectively.

As described above, the device of the present invention can suppress the amount of ice making around the brine header, preferentially melt the ice accretion around the brine header at the time of ice melting, and also the tube. The support can be significantly reduced, and the deformation due to the contact of the heat transfer tube with the tube support can be significantly reduced.

[0024]

As described above, according to the present invention, the ice accretion amount of the brine header at the time of ice making can be suppressed without making the heat storage tank into a special shape or upsizing,
Moreover, it is possible to obtain an ice heat storage tank unit device of this type capable of sufficiently preventing the unmelted residue of ice during melting.

[Brief description of the drawings]

FIG. 1 is a partially cutaway external view showing an embodiment of an ice heat storage unit device of the present invention.

FIG. 2 is a side view showing the positional relationship between the water level in the heat storage tank and the brine header of the present invention.

FIG. 3 is a side view showing the positional relationship between the initial ice making water level and the brine header of the present invention.

FIG. 4 is a side view showing the positional relationship between the initial ice making water level and the brine header of the present invention.

FIG. 5 is a side view showing another embodiment of the ice heat storage unit device of the present invention.

FIG. 6 is a perspective view of a tube support used in the ice heat storage unit device of the present invention.

FIG. 7 is a side view showing another embodiment of the ice heat storage unit device of the present invention.

FIG. 8 is a side view showing another embodiment of the ice heat storage unit device of the present invention.

FIG. 9 is a side view showing another embodiment of the ice heat storage unit device of the present invention.

FIG. 10 is a perspective view of a tube support used in the ice heat storage unit device of the present invention.

FIG. 11 is a partially cutaway external view showing a conventional ice heat storage unit device.

[Explanation of symbols]

1 ... Heat storage tank, 2 ... Water header, 3 ... Brine header, 4 ...
Heat transfer tube, 5 ... Water outlet, 6 ... Warm water, 7 ... Guide plate, 12 ... Initial ice making water level, 13 ... Water level at the end of ice making, 14 ... Water level at the end of ice melting.

Claims (7)

[Claims] 1. A heat storage tank, a heat transfer tube arranged in the heat storage tank and having ice adhered thereto, a brine header for injecting a refrigerant into the heat transfer tube, and the ice adhered to the heat transfer tube being melted. In an ice heat storage unit device comprising a water header for injecting water to scavenge, and a water discharge part for guiding cooling water that melts ice adhered to a heat transfer tube to an air conditioning system, the brine header is An ice heat storage unit device characterized in that the water storage unit is formed in a tubular shape and arranged horizontally, and a water header having a water injection port facing downward is arranged above the brine header. 2. A heat storage tank, a heat transfer tube arranged in the heat storage tank and having ice adhered thereto, a brine header for injecting a refrigerant into the heat transfer tube, and the ice adhered to the heat transfer tube being melted. In an ice heat storage unit device comprising a water header for injecting water to scavenge, and a water discharge part for guiding cooling water that melts ice adhered to a heat transfer tube to an air conditioning system, the brine header and An ice heat storage unit device, wherein each water header is formed in a tubular shape extending in a horizontal direction, and the water header is arranged above the brine header. 3. A heat storage tank, a heat transfer tube arranged in the heat storage tank and having ice adhered thereto, a brine header for injecting a refrigerant into the heat transfer tube, and the ice adhered to the heat transfer tube being melted. In an ice heat storage unit device comprising a water header for injecting water to scavenge, and a water discharge part for guiding cooling water that melts ice adhered to a heat transfer tube to an air conditioning system, the brine header is In addition to forming a tubular and horizontal arrangement, the connecting portion between the brine header and the heat transfer tube is provided on the lower surface of the brine header, and the water header is arranged above the brine header. A characteristic ice heat storage unit device. 4. The ice heat storage unit device according to claim 3, wherein the heat transfer tube is formed so as to meander vertically. 5. A heat storage tank, a heat transfer tube arranged in the heat storage tank and to which ice is attached, a brine header for injecting a refrigerant into the heat transfer tube, and the ice attached to the heat transfer tube is melted. In an operating method of an ice heat storage unit device, which comprises a water header for injecting water to scavenge and a water discharge part for guiding cooling water that melts ice adhering to a heat transfer tube to an air conditioning system, Initially, the water surface position in the heat storage tank is located below the brine header, and at the end of ice making, the water level raised by volume expansion due to a phase change is located above the brine header so that the water level is located above the brine header. A method of operating an ice heat storage unit device, characterized in that a water level position is set and operated. 6. A heat storage tank, a heat transfer tube arranged in the heat storage tank and having ice attached thereto, a brine header for injecting a refrigerant into the heat transfer tube, and the ice attached to the heat transfer tube being melted. In an operation method of an ice heat storage unit device, comprising: a water header for injecting water to scavenge; and a water discharge part for guiding cooling water, which is obtained by melting ice adhered to a heat transfer tube, to an air conditioning system, The brine header is formed horizontally, and the water header is placed on top of this brine header, and at the initial stage of ice making, the water surface position in the heat storage tank is located below the brine header, and the ice making ends. At this time, the position of the brine header and the water level are set and operated so that the water level raised by the volume expansion is located above the brine header. The rolling method. 7. The method of operating the ice heat storage unit device according to claim 5, wherein the brine header is formed in a tubular shape extending in the horizontal direction, and water is poured from the water header to the brine header from above. .