JP3297151B2 - Ice storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device applied to an air conditioner or the like.

[0002]

2. Description of the Related Art FIG. 6 is a system diagram of an ice storage type air conditioner. The ice heat storage type air conditioner includes an ice heat storage tank 1. In the ice heat storage tank 1, a heat transfer tube 3 is installed so as to penetrate into stored water 2.

[0003] During the cooling operation, the gas refrigerant discharged from the compressor 4 enters the outdoor heat exchanger 6 through the four-way switching valve 5 as shown by the solid line arrow, and condenses by radiating heat to the outside air. Liquefy.

[0004] The liquid refrigerant enters the air-conditioning throttle 9 via the liquid pipe 7 and the on-off valve 8, is adiabatically expanded by being throttled here, and then enters the indoor heat exchanger 10 where the indoor air is cooled. This evaporates. This gas refrigerant is
The gas is again sucked into the compressor 4 from the gas pipe 11 via the four-way switching valve 5.

[0005] During the heating operation, the four-way switching valve 5 is switched in the reverse manner. In this state, the refrigerant discharged from the compressor 4 enters the four-way switching valve 5, the gas pipe 11, the indoor heat exchanger 10 as shown by the broken line arrow, and furthermore, the air-conditioning throttle 9, the on-off valve 8, the liquid pipe From 7 enters the outdoor heat exchanger 6 and returns to the compressor 1 via the four-way switching valve 5.

During the cooling operation and the heating operation, the on-off valves 12, 13, and 14 are all closed, and the refrigerant pump 15 is stopped. On the other hand, during the ice making operation of the ice heat storage tank 1, the on-off valves 12 and 14 are opened, and the on-off valves 13 and 14 are opened.
Is closed, and the refrigerant pump 15 is stopped.

In this state, the refrigerant discharged from the compressor 4 enters the outdoor heat exchanger 6 via the four-way switching valve 5, as shown by the white arrow, and is condensed and liquefied here. This liquid refrigerant is
The liquid enters the cold storage throttle 17 via the liquid pipe 7, the bypass liquid pipe 16, and the on-off valve 12, and is adiabatically expanded by being throttled here.

The refrigerant enters the heat transfer tube 3, cools the water 2 outside the tube in the process of flowing from the bottom upward, and freezes the water 2 around the heat transfer tube 3 to evaporate. Vaporize.
This gas refrigerant is sucked into the compressor 4 via the bypass gas pipe 19, the on-off valve 14, the gas pipe 11, and the four-way switching valve 5.

Also, during the deicing operation, the compressor 4 stops,
The refrigerant pump 15 is driven. And each on-off valve 13, 1
4 is opened, and the respective on-off valves 8 and 12 are closed. In this state, the liquid refrigerant discharged from the refrigerant pump 15 passes through the liquid sending pipe 19 and the liquid pipe 7 as shown by the black arrow, and the air conditioning throttle 9
Then, the indoor air is cooled by the indoor heat exchanger 10 to evaporate and liquefy.

The gas refrigerant enters the heat transfer tube 3 through the gas pipe 11, the bypass gas pipe 18, and the on-off valve 14, and melts the ice outside the pipe in the process of flowing down from above to below. After being condensed and liquefied, the refrigerant is sucked into the refrigerant pump 15 through the on-off valve 13.

[0011]

As described above, in the air conditioner, during the ice making operation, the liquid refrigerant flows through the inside of the heat transfer tube 3 from the bottom to the top. The ice gradually grows on the lower surface.

On the other hand, during the deicing operation, the refrigerant flows through the heat transfer tube 3 from top to bottom, so that the ice above the heat transfer tube 3 is melted at an early stage, and the water temperature in the upper part of the ice heat storage tank 1 is increased. Rises quickly, so that the heat exchange capacity of the upper part of the heat transfer tube 3 decreases quickly.

As a result, the degree of supercooling of the liquid refrigerant condensed and liquefied in the heat transfer tube 3 is reduced, so that when the refrigerant drops in pressure in the air-conditioning throttle 9, the liquid refrigerant becomes difficult to circulate, The cooling capacity of the heat exchanger 10 decreases,
There is a problem that cavitation is generated in the refrigerant pump 15 and the noise is increased. Therefore, an object of the present invention is to provide an ice heat storage device capable of suppressing a decrease in heat exchange capacity and solving the above-described problems.

[0014]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and a first aspect of the present invention is to provide an ice heat storage tank in which water is stored in an ice heat storage tank. A heat transfer coil and an ice melting heat transfer coil are installed, and a refrigerant flows through the ice making heat transfer coil during ice making, and a refrigerant flows through the ice making heat transfer coil and the ice melting heat transfer coil during ice melting. In the ice heat storage device in which the refrigerant pipes are connected as described above, a supercooling heat transfer coil is provided in the ice heat storage tank, and the refrigerant flowing through the ice making heat transfer coil and the ice melting heat transfer coil at the time of melting ice. Is further circulated through the supercooling heat transfer coil and taken out.

The gist of the second invention is that a heat transfer coil for ice making, a heat transfer coil for deicing and a heat transfer coil for supercooling are sequentially arranged from the upper part to the lower part in the ice storage tank. An ice heat storage device characterized in that:

The gist of the third invention is that a heat transfer coil for ice making, a heat transfer coil for melting ice and a heat transfer coil for supercooling are connected to a series, or the heat transfer coil for ice making and the ice melting transfer coil are connected. An ice heat storage device characterized in that the supercooling heat transfer coil is connected in series to a heat coil.

The gist of the fourth invention is that a partition plate is provided around the defrosting heat transfer coil, and water is sucked from an area on the side of the defrosting heat transfer coil partitioned by the partition plate. An ice heat storage device comprising a water pump that circulates above an ice heat storage tank.

[0018]

According to the first aspect of the present invention, an ice making heat transfer coil, an ice melting heat transfer coil, and a supercooling heat transfer coil are installed in an ice heat storage tank. The heat is passed through the coil and the heat transfer coil for deicing, and is further passed through the heat transfer coil for supercooling.

In the second aspect of the invention, the refrigerant in the ice heat storage tank is supplied to the ice making heat transfer coil, the ice melting heat transfer coil and the supercooling heat transfer coil which are sequentially arranged from the upper part to the lower part. Flow in order.

In the third aspect of the invention, the refrigerant in the ice heat storage tank flows in the order of the ice making heat transfer coil, the ice melting heat transfer coil, and the supercooling heat transfer coil connected in series, or Flows in parallel to the heat transfer coil for cooling and the heat transfer coil for deicing, and then to the heat transfer coil for supercooling.

In the fourth aspect of the invention, water is sucked by a water pump from an area on the side of the ice melting heat transfer coil separated by a partition plate in the ice heat storage tank, and is circulated to the upper part of the ice heat storage tank.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a system diagram of the ice storage type air conditioner. In the water 2 of the ice storage tank 1, a heat transfer coil 20 for making ice, a heat transfer coil 21 for melting ice, and a heat transfer coil 22 for supercooling are provided.

The ice making heat transfer coil 20, the ice melting heat transfer coil 21 and the supercooling heat transfer coil 22 are sequentially arranged in this order from the upper part to the lower part in the ice heat storage tank 1. The ice making heat transfer coil 20 is divided into a first ice making heat transfer coil 20a and a second ice making heat transfer coil 20b, of which the first ice making heat transfer coil 20a is the second ice making heat transfer coil 20a. It is arranged above the ice making heat transfer coil 20b.

The connection configuration of these coils 20, 21, 22 may be any of the following two systems. That is, the ice making heat transfer coil 20, the ice melting heat transfer coil 21, and the supercooling heat transfer coil 22 are connected in series as shown in FIG.

As shown in FIG. 3, the coils 20 to 22 include an ice making heat transfer coil 20 and an ice melting heat transfer coil 21.
Are connected in parallel, and a supercooling heat transfer coil 22 is connected to these coils 20 and 21 in series.

Further, the partition plate 2 is attached to the heat transfer coil 21 for melting ice.
3 are provided. The partition plate 23 is formed by enclosing the upper and lower sides and the side surfaces of the heat transfer coil 21 for melting ice and closing one end thereof.

A water circulating pump 24 is connected to a portion of the partition plate 23 which closes one end thereof, and a portion of the water surrounded by the partition plate 23 is sucked and supplied from the upper part of the ice heat storage tank 1. And circulate.

On the other hand, a pipe 25 for an ice heat storage tank is connected between the outdoor heat exchanger 6 and the on-off valve 8 in the liquid pipe 7 connected to the outdoor heat exchanger 6. Each open / close valve 26 and an expansion valve 27 are provided in the pipe 25, and the ends thereof are penetrated into the ice heat storage tank 1 and the first ice making heat transfer coil 20a and the second ice making transfer coil 20a. It is connected in parallel to each lower end of the thermal coil 20b. In addition, piping 2
Distribution pipes 25a and 25b are connected between the first heat transfer coil 5 and the first and second heat transfer coils 20a and 20b, respectively.

The gas pipe 11 has a pipe 2 for an ice heat storage tank.
8 are connected. The pipe 28 is provided with an on-off valve 29, the end of which is penetrated into the ice heat storage tank 1 and
The upper and lower ends of the ice making heat transfer coil 20a and the second ice making heat transfer coil 20b are connected in parallel. A check valve 30 is connected in parallel to the on-off valve 29. An on-off valve 31 is connected between each of the pipes 25 and 28.

A pipe 32 for an ice heat storage tank is connected between the on-off valve 8 and the air-conditioning throttle 9 in the liquid pipe 7. The pipe 32 is provided with a check valve 33, an on-off valve 34, a pulsation prevention chamber 35, a refrigerant liquid pump 36 and a check valve 37, and the ends thereof are connected to the supercooling heat transfer coil 22. . The refrigerant liquid pump 36 is connected to a pump liquid level adjusting pipe 38.

The refrigerant liquid pump 36 is arranged as follows. That is, the refrigerant liquid pump 36 is disposed below the ice heat storage tank 1 as shown in FIG. 4, or a pipe from the supercooling heat transfer coil 22 is placed from above the ice heat storage tank 1 as shown in FIG. Drawer and placed above ice thermal storage tank 1.

Next, the operation of the above-configured device will be described. During the cooling operation, the gas refrigerant discharged from the compressor 4 enters the outdoor heat exchanger 6 via the four-way switching valve 5 as shown by a solid arrow, where it is condensed and liquefied by releasing heat to the outside air.

The liquid refrigerant enters the air-conditioning throttle 9 via the liquid pipe 7 and the on-off valve 8, and is adiabatically expanded by being throttled here. Then, the liquid refrigerant enters the indoor heat exchanger 10, where the indoor air is cooled. This evaporates. This gas refrigerant is
The gas is again sucked into the compressor 4 from the gas pipe 11 via the four-way switching valve 5.

At the time of heating operation, the four-way switching valve 5 is switched in the reverse manner. In this state, the refrigerant discharged from the compressor 4 enters the four-way switching valve 5, the gas pipe 11, and the indoor heat exchanger 10 as shown by the dotted arrow, and further, the air-conditioning throttle 9, the on-off valve 8, the liquid pipe. From 7 enters the outdoor heat exchanger 6 and returns to the compressor 1 via the four-way switching valve 5.

During the cooling operation and the heating operation, the on-off valves 26, 29, 31, and 34 are all closed, and the refrigerant liquid pump 36 is stopped. On the other hand, during the ice making operation of the ice heat storage tank 1, the on-off valves 8, 31, and 34 are closed, and the on-off valves 26 and 29 are open.

In this state, the refrigerant discharged from the compressor 4 enters the outdoor heat exchanger 6 via the four-way switching valve 5 as shown by the white arrow, where it is condensed and liquefied. This liquid refrigerant is
The liquid enters the pipe 25 from the liquid pipe 7, and further passes through the on-off valve 26, the expansion valve 27, and the respective distribution pipes 25 a and 25 b to form the first and second pipes.
Of the ice making heat transfer coils 20a and 20b.

In the ice making heat transfer coils 20a and 20b, the refrigerant flows upward through the inside of the heat making coils 20a and 20b, and in this process, the water 2 outside the pipe is cooled, and the water 2 is cooled. It freezes around 20a, 20b and evaporates.

The gas refrigerant passes through the on-off valve 29 and the pipe 28, and is sucked into the compressor 4 via the four-way switching valve 5. During the thawing operation, the compressor 4 is stopped, and the refrigerant liquid pump 36 is driven. Then, the respective on-off valves 29, 34 are opened, and the respective on-off valves 8, 31, 26 are closed.

In this state, the liquid refrigerant discharged from the refrigerant liquid pump 36 is adiabatically expanded by the air-conditioning throttle 9 through the pipe 32 as shown by the black arrow, and thereafter the indoor heat exchanger 10
The room air is evaporated and liquefied by cooling.

This gas refrigerant is supplied to the gas pipe 11, the pipe 28,
The first and second ice-making heat transfer coils 20 via an on-off valve 29
a, 20b, and flows through them from top to bottom. Then, in this process, the ice outside the tube is partially condensed and liquefied by melting.

Further, the gas refrigerant flowing through the first and second ice making heat transfer coils 20a and 20b enters the ice melting heat transfer coil 21 and condenses by melting ice outside the tube in this process. Liquefy.

Then, the supercooled refrigerant enters the supercooling heat transfer coil 22 from the deicing heat transfer coil 21 and is sucked into the refrigerant pump 36 via the check valve 37. In the ice melting operation, the first and second heat transfer coils for ice making 20a, 20b
2 are connected in parallel, but as shown in FIG. 2, an ice melting heat transfer coil 21 and a supercooling heat transfer coil 22 are connected in series to an ice making heat transfer coil 20.

On the other hand, as shown in FIG. 3, the heat transfer coil 20 for ice making and the heat transfer coil 21 for defrosting are connected in parallel, and the heat transfer coil 22 for supercooling is connected in series to this. In the ice operation, the liquid refrigerant discharged from the refrigerant liquid pump 36 in the same manner as above
After passing through 2, the adiabatic expansion is performed by the air-conditioning throttle 9, and thereafter, the indoor air is cooled by the indoor heat exchanger 10 to evaporate and liquefy.

The gas refrigerant is supplied to the gas pipe 11, the pipe 28,
The first and second ice-making heat transfer coils 20 via an on-off valve 29
a, 20b and the heat transfer coil 21 for deicing, and each of them flows from top to bottom. In this process, ice outside the tube is melted to condense and liquefy.

Further, the gas refrigerant flowing through the first and second ice making heat transfer coils 20a and 20b and the ice melting heat transfer coil 21 flows to the supercooling heat transfer coil 22, and in this process. It is further cooled and becomes a supercooled refrigerant.

Then, the refrigerant is sucked from the supercooling heat transfer coil 22 to the refrigerant pump 36 via the check valve 37. During this time,
The water circulation pump 24 sucks water in a portion surrounded by the partition plate 23 and supplies and circulates the water from the upper part of the ice heat storage tank 1.

As described above, in the first embodiment, the ice making heat transfer coil 20, the ice melting heat transfer coil 21, and the supercooling heat transfer coil 22 are installed in the ice heat storage tank 1, and the ice melting operation is performed. At this time, the refrigerant is allowed to flow through the ice making heat transfer coil 20 and the ice melting heat transfer coil 21 which are sequentially arranged from the upper part to the lower part, and is further made to flow through the supercooling heat transfer coil 22. Thawing can be performed smoothly, and a decrease in heat exchange capacity can be suppressed.

In this case, the ice making heat transfer coil 20, the ice melting heat transfer coil 21 and the supercooling heat transfer coil 22 are connected in series, or the ice making heat transfer coil 20 and the ice melting heat transfer coil 21 are connected. Are connected in parallel and the supercooling heat transfer coil 22 is connected to the series, the ability to melt the ice can be greatly increased.

During the deicing operation, the refrigerant flows not only through the ice-making heat transfer coil 20 but also through the deicing heat transfer coil 21 and further through the supercooling heat transfer coil 22. It can be sufficiently subcooled. Particularly, the supercooling heat transfer coil 22 is provided in the ice heat storage tank 1 whose water temperature is kept low by natural convection.
, Sufficient supercooling can be obtained. Therefore, it is possible to prevent a decrease in the cooling capacity during the thawing operation, a boiling of the refrigerant liquid in the throttle, a reduction in the amount of circulating refrigerant, and the occurrence of cavitation in the refrigerant pump.

In addition, since water is sucked by the water pump 24 from the area on the side of the ice melting heat transfer coil 21 separated by the partition plate 23 in the ice heat storage tank 1 and circulated to the upper part of the ice heat storage tank 1, the ice heat storage The low-temperature water in the tank 1 is guided to the area on the side of the heat transfer coil 21 for deicing, and the water whose temperature has been increased by heat exchange is held in the upper part of the ice heat storage tank 1 and comes into contact with ice around the heat transfer coil 20 for ice making. Then, the ice can be thawed, and as a result, a sufficient capacity can be obtained during the thaw operation.

On the other hand, by disposing the refrigerant liquid pump 36 below the ice heat storage tank 1 as shown in FIG. 4, the refrigerant liquid can be reliably guided to the refrigerant liquid pump 36 and discharged. By arranging the refrigerant liquid pump 36 above the ice heat storage tank 1 as shown in FIG. 5, the refrigerant liquid pump 36 can be discharged without being sealed by the refrigerant liquid.
In this case, it is effective if the refrigerant liquid pump 36 is a rotary pump.

Next, a second embodiment of the present invention will be described. Note that the apparatus shown in FIG. 1 is applied as an ice regenerative air conditioner. In this embodiment, an operation mode of the ice regenerative air conditioner is controlled. In this operation mode,
As described above, there are a cooling operation, a heating operation, an ice making operation, and an ice melting operation.

In the control of the operation mode, a timer is provided in the control device of the ice storage type air conditioner, and the operation mode set by the time limit of the timer is switched.
In this case, the control device controls the compressor 4,
Refrigerant liquid pump 36, outdoor heat exchanger 6, outdoor heat exchanger 10
And the on-off valves 8, 29, 26, 3
It has a function to control the opening and closing of the first and the third.

However, the control device operates the timer to execute switching control of the set operation mode.
For example, the operation mode is set as follows. Time 1
Defrosting operation from 3:00 to 16:00, time 16:00 to 2
The cooling operation is performed at 3:00, the ice making operation is performed at 23:00 to 6:00, and the cooling operation is performed at 6:00 to 13:00.

As described above, according to the second embodiment, a desired operation mode is set in the ice regenerative air conditioner,
Automatic operation control is possible. The present invention is not limited to the above embodiments, but may be modified within the scope of the invention.

For example, the ice making heat transfer coil 20, the ice melting heat transfer coil 21, and the supercooling heat transfer coil 22 installed in the ice heat storage tank 1 may be constituted by a plurality of coils, respectively. . That is, each of the coils 20, 21, 22 such as an ice making heat transfer coil is configured by connecting a plurality of coils in parallel, and these coils are juxtaposed in the ice heat storage tank 1.

The partition plate 23 is provided with a heat transfer coil 21 for melting ice.
The water 2 around the water circulation pump 2 may be simply provided by providing a partition plate for separating the water 2 from the heat transfer coil 20 for making ice.
The upper and lower sides may be communicated with each other on the opposite side of the connection side, or a water circulation pump 24 may be connected thereto by surrounding the deicing heat transfer coil 21 with, for example, a cylindrical shape. Further, a small-diameter hole may be formed in the partition plate 23.

[0058]

As described above, according to the first aspect of the present invention, it is possible to provide an ice heat storage device capable of suppressing a decrease in heat exchange capacity during a de-icing operation. In this case, the heat transfer coil for ice making, the heat transfer coil for deicing and the heat transfer coil for supercooling are sequentially arranged from the upper part to the lower part in the ice heat storage tank as in the second and third inventions, And even if these coils are connected to a series, or a supercooling heat transfer coil is connected to the series for the ice making heat transfer coil and the ice melting heat transfer coil, the heat exchange capacity can be increased, However, since the refrigerant flows through the supercooling heat transfer coil, the refrigerant can be sufficiently supercooled, the cooling capacity at the time of thawing operation decreases, the refrigerant liquid boils at the throttle, the refrigerant circulation amount decreases, and the refrigerant pump Can prevent cavitation and the like.

According to the fourth aspect of the present invention, water is sucked from the area on the side of the heat transfer coil for defrosting separated by the partition plate and circulated to the ice heat storage tank. Water having a low temperature can be circulated to the defrosting heat transfer coil side area, and the capacity during the defrosting operation can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of an ice heat storage type air conditioner to which an ice heat storage device according to the present invention is applied.

FIG. 2 is a connection diagram when each heat transfer coil installed in an ice heat storage tank in the device is connected in series.

FIG. 3 is a connection diagram when respective heat transfer coils installed in an ice heat storage tank in the same device are connected in parallel.

FIG. 4 is a layout diagram in which a refrigerant liquid pump 36 in the same device is provided below an ice heat storage tank.

FIG. 5 is a layout view of the same device in which a refrigerant liquid pump 36 is provided above an ice heat storage tank.

FIG. 6 is a configuration diagram of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ice heat storage tank, 4 ... Compressor, 6 ... Outdoor heat exchanger, 10 ... Indoor heat exchanger, 20 ... Heat transfer coil for ice making, 21 ... Heat transfer coil for ice melting, 22 ... Heat transfer coil for supercooling Reference numeral 23: Partition plate 24: Water circulation pump 36: Refrigerant liquid pump

Continuation of the front page (56) References JP-A-4-356637 (JP, A) JP-A-64-10068 (JP, A) JP-A-1-174864 (JP, A) JP-A-2-223770 (JP) JP-A-6-213525 (JP, A) JP-A-7-19538 (JP, A) JP-A-7-19537 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) F24F 5/00

Claims (4)

(57) [Claims] An ice making heat transfer coil and an ice melting heat transfer coil are installed in an ice heat storage tank in which water is stored, and a refrigerant is circulated through the ice making heat transfer coil at the time of ice making, and the ice making heat transfer coil is provided at the time of ice melting. In an ice heat storage device comprising a refrigerant pipe connected to allow a refrigerant to flow through the ice making heat transfer coil and the ice melting heat transfer coil, a supercooling heat transfer coil is provided in the ice heat storage tank, An ice heat storage device, wherein a refrigerant flowing through the ice making heat transfer coil and the ice melting heat transfer coil is further passed through the supercooling heat transfer coil to be taken out. 2. A heat transfer coil for ice making, a heat transfer coil for deicing, and a heat transfer coil for supercooling are sequentially arranged from an upper part to a lower part in the ice heat storage tank. The ice heat storage device as described in the above. 3. A heat transfer coil for ice making, a heat transfer coil for melting ice, and a heat transfer coil for supercooling are connected to a series, or the heat transfer coil for ice making and the heat transfer coil for defrosting are connected to the supercooling coil. The ice heat storage device according to claim 1, wherein the heat transfer coils are connected in series. 4. A partition plate is provided around a heat transfer coil for melting ice, and water is sucked from an area on the side of the heat transfer coil for melting ice separated by the partition plate and circulated to an upper portion of the ice storage tank. The ice heat storage device according to claim 1, further comprising a pump.