JPH01291067A - Thermoaccumulation type freezer - Google Patents

Abstract

PURPOSE:To provide a proper removal of a crystal of thermal accumulation material adhered around a heat exchanger, facilitate an aquisition of heat, improve a maintenance characteristic, a working characteristic and a reliability characteristic and reduce a consumption power by a method wherein a control circuit which can be alternately inputted to heaters of a first and a second thermal flow controlling and thermal transmitting devices is provided. CONSTITUTION:In the case that a crystal adhered to a cooling device 43 is removed and a thermal resistance is reduced, at first a heater 28 of a first thermal flow controlling transmitting device 2 is turned off. With this arrangement, a thermal transmittance from an evaporating heat exchanger 21 to a condensing heat exchanger 22 is stopped, and a cooling capability of a cooling device 43 is temporarily terminated. Then, an input is added to a heater 38 of the second thermal flow controlling and transmitting device 3. A part of heat generated at a condensor 6 to a freezer device 1 is transmitted from an evaporating heat exchanger 31 to a cooling device 43 within a thermal accumulation tank 1. With this heat, a part of crystal at an interface part of a cooling device 43 is melted and removed and then the crystal is removed from the cooling device 43. After the crystal is removed from the cooling device 43, an input of the heater 38 is terminated and an input is added to the heater 28 so as to perform a thermal accumulation within the thermal accumulation material 42.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat storage type refrigeration system, and in particular to a method for thermally coupling a refrigeration system and a heat storage tank by a heat flow controllable heat transfer device having no moving parts. The present invention relates to a heat storage type refrigeration device suitable for improving the reliability of heat storage.

[Prior Art] In recent years, air conditioners have also been using electricity at night to store cold and use this cold energy for air conditioning during the day in order to save energy and be economical.

For example, JP-A-51-7747, JP-A-58-2
541, and those described in JP-A-53-148145 are known.

In particular, JP-A-53-148145 discloses an air conditioner with a general refrigeration cycle, a heat storage tank filled with a heat storage material, an evaporator installed in the heat storage tank, and an outdoor heat exchanger. A condenser installed in A technology was disclosed for transferring heat to and from an outdoor heat exchanger, or from an outdoor heat exchanger to a heat storage tank.

[Problems to be Solved by the Invention] The technology described in Japanese Patent Application Laid-open No. 51-7747 requires a complicated process when arranging the refrigeration system in a layer and the heat storage tank outdoors and thermally coupling them. The refrigeration equipment, which has a cycle configuration, had to be filled with refrigerant and adjusted on-site, and no consideration was given to ease of construction and maintainability.

In addition, the technology described in the above-mentioned Japanese Patent Application Laid-Open No. 58-2541 is as follows:
The above problem has been solved by an indirect heat exchange method in which the refrigeration system and the heat storage tank are connected through piping containing a heat medium, and the heat medium is circulated by a pump, but on the other hand, the reliability of the pump with mechanically moving parts has been reduced. No consideration was given to the fact that the pump requires a large amount of power.

Furthermore, the technology described in Japanese Patent Application Laid-Open No. 53-148145 is the closest technology to the present invention, and uses a heat transfer device without moving parts to transfer heat from an outdoor heat exchanger of an air conditioner to a heat storage tank or a heat storage tank. The cold heat stored in the heat storage tank can be effectively used for heating and cooling by transferring heat to and from the outdoor heat exchanger, but the heat storage material that adheres around the heat exchanger (evaporator) inside the heat storage tank No consideration was given to reducing the thermal resistance of the heat exchanger by appropriately removing crystals (for example, ice). Further, the cycle configuration and operating method of the heat transfer device section were different from the present invention.

The present invention has been made in order to solve the above-mentioned problems in the prior art, and when extracting heat while solidifying the heat storage material in the heat storage tank, the present invention prevents crystals of the heat storage material that adheres around the heat exchanger in the heat storage tank. The purpose is to provide a heat storage type refrigeration device that facilitates the acquisition of heat by detaching it as appropriate, has high maintainability, workability, and reliability, and consumes less power.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the regenerative refrigeration device according to the present invention is such that a compressor, a condenser, a pressure reduction mechanism, and an evaporator are connected through piping to form a refrigeration cycle. a refrigeration system, a heat storage tank filled with a heat storage material and having a cooler, an evaporation heat exchanger, a condensation heat exchanger, a liquid return pipe connecting these heat exchangers,
In a regenerative refrigeration system comprising an inverted U-shaped riser, a heater provided at the base of the riser, and a heat flow controllable heat transfer device that forms a closed m-ring for evaporative liquid using a vapor transfer pipe, At least two sets of the heat flow controllable heat transfer devices are provided, wherein the condensing heat exchanger of the first heat flow controllable heat transfer device is provided in the evaporator, and the first heat flow controllable heat transfer device is provided in the cooler in the heat storage tank. A second evaporation heat exchanger is installed in the condenser.
The condensing heat exchanger of the second heat flow controllable heat transfer device is arranged in the evaporation heat exchanger of the heat flow controllable heat transfer device and the cooler in the heat storage tank, and the condensation heat exchanger of the second heat flow controllable heat transfer device is disposed in the evaporation heat exchanger of the heat flow controllable heat transfer device of A control circuit is provided that can alternately input input to the heater of the second heat flow controllable heat transfer device.

As an additional note, the above purpose is an evaporation heat exchanger.

The first heat flow control method uses two sets of heat flow control heat transfer devices consisting of a condensing heat exchanger, a liquid return pipe, a riser pipe, a heater installed at the base of the riser pipe, and a vapor transfer pipe. A second heat flow controllable heat transfer device thermally connects the evaporator of the refrigerator and a cooler in the heat storage tank, and a second heat flow controllable heat transfer device connects the condenser of the refrigerator and the cooler in the heat storage tank. This is achieved by combining the

[Effect] The function of the above technical means is as follows.

The heat flow control heat transfer device uses the boiling action and condensation action of an evaporative liquid, and has extremely high reliability because it does not have moving parts like a conventional pump. Furthermore, since the heat flow control heat transfer device is operated with an evaporative liquid sealed in it, even if the liquid leaks during maintenance and inspection, it will evaporate, making it easier to handle than conventional antifreeze.

The refrigeration equipment operates in a normal refrigeration cycle, and when the first heat flow control heat transfer device is activated and input is input to the heater at the base of the riser pipe, the refrigeration equipment is liquefied in the condensing heat exchanger thermally connected to the evaporator. The evaporative liquid enters the evaporative heat exchanger via the liquid return pipe, where the heat storage material is solidified in the cooler, and the evaporative liquid is vaporized and returns to the condensing heat exchanger via the vapor transfer pipe, completing the cycle. Configure.

Next, when the second heat flow controllable heat transfer device is activated and input is input to the heater at the base of the riser pipe, the evaporative liquid vaporized in the evaporation heat exchanger thermally connected to the condenser passes through the vapor transfer pipe. The liquid enters the condensing heat exchanger, where the heat storage material crystals are separated from the cooler, and the evaporative liquid is liquefied and returned to the evaporative heat exchanger via the liquid return pipe, forming a cycle.

By repeating this operation alternately, a large amount of heat storage material crystals are accumulated in the heat storage tank.

Further, the input to be applied to the heater in the heat flow controllable heat transfer device is as small as, for example, about 1720 times the amount of heat transferred from the condensation heat exchanger to the evaporation heat exchanger, and the power consumption is also small.

[Embodiments] Each embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

First, FIG. 1 is a schematic configuration diagram of a regenerative refrigeration system according to an embodiment of the present invention.

The thermal storage type refrigeration system of this embodiment shown in FIG.
y first heat flow controllable heat transfer device 2, second heat flow controllable heat transfer device 3. It is composed of a heat storage tank 4.

The refrigeration system consists of an evaporator 5, a condenser 6, a compressor 7, and a pressure reducing mechanism 8, which form a refrigeration cycle circulation path with piping 9 as shown in the figure. Contains sexual fluid.

The first heat flow controllable heat transfer device 2 includes an evaporation heat exchanger 21
, condensing heat exchanger 22, vapor transfer pipe 23° liquid return pipe 24
, are connected to form a closed circulation path by a tank 27 provided in the middle and an inverted U-shaped riser pipe 25 with a heater 28 at the base, and evaporative liquids such as fluorocarbons are contained inside. It's in.

The second heat flow controllable heat transfer device 3 includes an evaporation heat exchanger 31
, condensing heat exchanger 32, vapor transfer pipe 33, liquid return pipe 34
, are connected to form a closed circulation path by an inverted U-shaped riser pipe 35 with a tank 37 installed in the middle and a heater 38 at the base, and evaporative liquids such as fluorocarbons are contained inside. It's in.

Further, in the heat storage tank 4, a tank frame 41 is filled with a heat storage material 42 such as water or calcium chloride hexahydrate, and a cooler 43 is immersed therein.

In the apparatus of this embodiment, the evaporator 5 of the refrigeration device 1 has the first heat flow controllable condensing heat exchanger 22 of the heat transfer device 2, and the cooler 43 in the heat storage tank 4 has the first heat flow controllability. Heat transfer device 2
An evaporative heat exchanger 21 is disposed in the condenser 6 of the refrigeration device 1, an evaporative heat exchanger 31 of the second heat flow control heat transfer device 3, and a cooler in the heat storage tank 4. 43, the condensing heat exchanger 32 of the second heat flow controllable heat transfer bag W3 is disposed.

Now: Refrigeration equipment 1. A case will be described in which the first heat flow controllable heat transfer device 2 is operated and the heat storage material 42 in the heat storage tank 4 is solidified to store cold.

When the compressor 7 is operated, the evaporative liquid inside is adiabatically compressed and enters the condenser 6 through the pipe 9.

Here, the evaporative liquid releases latent heat of condensation and becomes liquefied, and then flows into the pressure reducing mechanism (for example, an expansion valve) 8.

The evaporative liquid is adiabatically expanded in the pressure reduction mechanism 8 to have a low temperature, and then flows into the evaporator 5 and returned to the compressor 7. Since the evaporator 5 is thus cooled by the adiabatic expansion of the evaporative liquid, the condensing heat exchanger 22 that is thermally coupled thereto is also cooled.

Along with the operation of the refrigeration system 1, the first heat flow controllable heat transfer device 2 is operated as follows. First, when a slight input is applied to the heater 28, the evaporative liquid boils inside the left side of the inverted U-shaped riser pipe 25, and the liquid around it is pumped up by the pumping action of the bubbles generated. The pumped liquid overflows over the top of the riser pipe 25 and flows into the evaporative heat exchanger 21 through the liquid return pipe 24 as shown by the arrow.

Here, the evaporative liquid absorbs heat from the heat storage material 42 located outside the cooler 43 in which the evaporative heat exchanger 21 is disposed and evaporates, and the vapor generated thereby is evaporated as shown by the arrow. The vapor flows through the vapor transfer pipe 23 into the condensing heat exchanger 22 of the evaporator 5, where it releases the heat of condensation and is liquefied.

The liquefied evaporative liquid is transferred to the condensing heat exchanger 2 by gravity.
2, flows into the tank 27, and further flows into the heater 2.
It flows into the base of the riser pipe 25 marked with 8 and repeats the same cycle.

The pressure equalizing pipe 26 is heated by the heater 28 so that the riser pipe 25
It has the function of separating the bubbles generated inside the pump from the pumped liquid and letting them escape into the condensing heat exchanger 22, thereby facilitating the bubble pump action.

In this way, the heat held by the heat storage material 42 in the heat storage tank 4 is transported to the refrigeration system via the first heat flow controllable heat transfer device 2, and is finally dissipated to the outside. Therefore, the temperature of the heat storage material 42 is lowered by the cooler 43 attached to the evaporative heat exchanger 21 (which may be integrated with the evaporative heat exchanger 21), and becomes below the freezing point. Along with this,
Crystals of the heat storage material 42 adhere around the cooler 43 .

When crystals thickly adhere to the cooler 43, the thermal resistance of that part increases, making it difficult for heat to enter the cooler 43 from the heat storage material 42. As a result, the crystal growth rate of the heat storage material 42 decreases, and the refrigeration system The coefficient of performance will also be worse.

Therefore, in this embodiment, the cooler 43
By removing the crystals attached to the surface, the thermal resistance is reduced.

First, the input to the heater 28 of the first heat flow controllable heat transfer device 2 is turned off. This eliminates the bubble pumping action in riser 25 and all evaporative liquid is stored in tank 27. For this reason.

Heat transport from the evaporation heat exchanger 21 to the condensation heat exchanger 22 is stopped, and the cooling capacity of the cooler 43 is temporarily stopped.

Next, input is applied to the heater 38 of the second heat flow controllable heat transfer bag W3. A part of the heat generated in the condenser 6 of the refrigeration device 1 is transmitted from the evaporative heat exchanger 31 to the cooler 43 in the heat storage tank 1. That is, the steam generated in the evaporative heat exchanger 31 flows through the steam transfer pipe 33 as shown by the arrow into the condensing heat exchanger 32 disposed in the cooler 43 in the heat storage tank 4, and the evaporative Liquids liquefy. This heat causes the cooler 43
A part of the crystal of the heat storage material crystal (not shown) attached to the cooler 43 interface is melted, and the crystal is separated from the cooler 43.

The liquefied evaporative liquid is transferred to a tank 37 as shown by the arrow.
The liquid returns to the evaporation heat exchanger 31 through a liquid return pipe 34 and a riser pipe 35 equipped with a heater 38, where it is vaporized and the same cycle is repeated. Note that 36 is a pressure equalizing pipe.

After the crystals are removed from the cooler 43, the operating method is returned to its original state.

That is, the heater 38 of the second heat flow controllable heat transfer device 3
input is stopped, input is applied to the heater 28 of the first heat flow controllable heat transfer device 2, the cooling action of the cooler 43 is performed again, and cold is stored in the heat storage material 42.

By repeating this operation alternately, a large amount of heat storage material crystals are accumulated in the heat storage tank 4.

This embodiment has the following effects.

(1)'! The crystallization and separation of the heat material can be smoothly performed, and therefore, the thermal resistance around the cooler is reduced, and the coefficient of performance of the refrigeration system is improved.

(2) Power consumption can be significantly reduced compared to when antifreeze is circulated using a conventional pump.

(3) Utilizing the boiling and condensation heat transfer of the evaporative liquid to improve the transfer performance of the heat exchanger and reduce its heat transfer area.

(4) Maintainability, workability, and reliability can be improved and it is convenient for practical use.

Next, FIG. 2 is a schematic configuration diagram of a regenerative refrigeration system according to another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In the embodiment shown in FIG. 2, the evaporation heat exchanger 31A of the second heat flow controllable heat transfer device 3A is provided in the compressor 7A section, and the heat storage material crystals are separated using the heat generated from the compressor 7A. It is something to do.

According to the embodiment shown in FIG. 2, the same effects as the embodiment shown in FIG. 1 can be expected, and the compressor 7A can be cooled.
Helps improve compressor efficiency and reliability.

Next, FIG. 3 is a schematic configuration diagram of a regenerative refrigeration system according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In the embodiments shown in FIGS. 1 and 2, the condenser 6 is located at a lower position than the evaporator 5 of the refrigeration system 1, but in the embodiment shown in FIG. When the evaporator 5 and condenser 6 are arranged at the same horizontal level,
This is an application of the present invention.

According to the embodiment shown in FIG. 3, the same effects as the previous embodiment can be expected.

It goes without saying that the present invention is also applicable to the case where the condenser 6 is located at a higher position than the cooler 43.

Next, FIG. 4 is a schematic configuration diagram of a regenerative refrigeration system according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In the embodiments shown in FIGS. 1 and 2, the evaporator 31.31A of the second heat flow controllable heat transfer device 3, 3A is provided in the condenser 6 or the compressor 7A, and the heat generated therefrom is disposed in the condenser 6 or the compressor 7A. Some of them are used.

In the embodiment of FIG. 4, the second heat flow controllable heat transfer device 3B
The evaporator 3 related to the evaporation heat exchanger of According to the embodiment shown in FIG. 4, the same effects as the previous embodiment can be expected.

Note that the evaporator section 31B shown in FIG.
1 for L is fine.

Next, FIG. 5 is a schematic configuration diagram of a regenerative refrigeration system according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

In FIG. 5, there are four first heat storage tanks for heat storage.

11 is a second heat storage tank, 12 is a heat storage material, and 13 is a heat storage material.

3rd heat storage tank, 14 is heat storage material, 15 is 1st heat storage tank 1
The heat exchanger 16 is a heat exchanger provided in the second heat storage tank 13.

In the embodiment of FIG. 5, in addition to the first heat storage tank 4 having a cooler 43, a second heat storage tank 4 is provided. A third heat storage tank 11° 13 is provided, and the evaporator 5 of the refrigeration device 1 and the condensing heat exchanger 22 of the first heat flow control heat transfer bag T2 are connected to the heat storage material 12 of the second heat storage tank 11.
The condenser 6 of the refrigeration device 1 and the generation heat exchanger 3 of the second heat flow controllable heat transfer device 3 are arranged in the heat storage material 14 of the third heat storage tank 13. The set is also C, y″′
1 MIG 1 tank 11 L: A heat exchanger 15 is provided so that the cold heat of the outside 1' can be introduced into the heat storage material 12 and used. It may be provided in contact with the evaporator 5 and the condensing heat exchanger 22 to directly cool these and remove heat.

Further, a heat exchanger 16 is provided in the third heat storage tank 13, and cold water or the like is introduced from the outside to remove the heat held by the heat storage material 14. This heat exchanger 16 may be brought into contact with the condenser 6 to directly extract heat.

In this way, by interposing the heat storage material 12 and the heat storage material 14 around the evaporator 5 and condenser 6 of the refrigeration device 1, the refrigeration device 1 can be operated in accordance with the versatility. For example, even if the temperature of the heat storage material 42 in the heat storage tank 4 fluctuates, the refrigeration device 1
In this case, only the temperature of the heat storage material 12 or 14 needs to be monitored, and the operation can be performed smoothly and with sufficient margin.

According to the embodiment shown in FIG. 5, the same effects as those of the previous embodiments are expected.

Next, FIG. 6 is a schematic configuration diagram of a regenerative refrigeration system according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 5 are the same parts as in the previous embodiment, so the explanation thereof will be omitted.

Note that the same reference numeral with a suffix ' indicates a plurality of equivalent parts.

The heat storage type refrigeration system shown in FIG. 6 includes two coolers 43 and 43' in the first heat storage tank 4A, and two
A set of first heat flow controllable heat transfer devices 2.2' and two sets of second heat flow controllable heat transfer devices 3.3' are provided.

That is, each condensing heat exchanger 22.22' of the two sets of first heat flow controllable heat transfer devices 2.2' is installed in the second heat storage tank 11A.
Each evaporation heat exchanger 31.3 of the two sets of second heat flow control heat transfer bags fi3.3' is arranged in the third heat storage tank 13A.
1', the evaporation heat exchangers 21 and 21' of the two sets of first heat flow controllable heat transfer devices 2 and 2', and the two sets of second heat flow controllable heat transfer devices 3. .3' condensing heat exchangers 32, 32' are arranged in each cooler 43, 43' in the heat storage tank 4A, respectively.

As for the operating method, when the first heat flow controllable heat transfer device 2 and the second heat flow controllable heat transfer device 3' are operated, the first heat flow controllable heat transfer device 2' and the second heat flow controllable heat transfer device 2' are operated. The operation of the heat flow controllable heat transfer bag W3 is stopped, and after a certain period of time, the operation is reversed and the operation is started.

In this way, between the coolers 43 and 43', it is possible to alternately attach the crystals on one side and remove the crystals on the other side, so that the crystals can be efficiently accumulated in the heat storage tank 4 and the cold can be stored quickly. can be completed.

By increasing the number of first and second heat flow controllable heat transfer devices and coolers by three times or more, it is possible to complete cold storage even earlier.

[Effects of the Invention] As described above, according to the present invention, when extracting heat while solidifying the heat storage material in the heat storage tank, the heat storage material crystals attached around the heat exchanger in the heat storage tank are appropriately separated. Along with making it easier to get heat.

It is possible to provide a thermal storage refrigeration device that has high maintainability, workability, and reliability, and consumes little power.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a regenerative refrigeration system according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a regenerative refrigeration system according to another embodiment of the invention, and FIG. is a schematic configuration diagram of a regenerative refrigeration system according to still another embodiment of the present invention, and each of FIGS. 4 to 6 is a schematic diagram of a regenerative refrigeration system according to yet another embodiment of the present invention. FIG. 1, IA... Refrigeration device, 2.2'... First heat flow controllable heat transfer device, 3.3', 3A, 3B... Second heat flow controllable heat transfer device, 4, 4A ...heat storage tank, 5...
・Evaporator, 6...Condenser, 7,7A...Compressor, 8
...pressure reduction mechanism, 11. IIA...Second heat storage tank...
・13,13A...Third heat storage tank, 21.21',
31°31'...evaporation heat exchanger, 22.22',
32゜32'... Condensing heat exchanger, 23, 23',
33゜33'...Steam transfer pipe, 24.24', 34
゜34'...Liquid return pipe, 28.28', 38, 38
'...Heater, 25, 25', 35.35'...
・Vertical double pipe, 43.43'...Cooler.

Claims (1)

[Claims] 1. A refrigeration system that connects a compressor, a condenser, a pressure reduction mechanism, and an evaporator to form a refrigeration cycle; a heat storage tank filled with a heat storage material and having a cooler; Exchanger, condensing heat exchanger, liquid return pipe connecting these heat exchangers, inverted U-shaped riser pipe, heater installed at the base of the riser pipe,
and a heat flow controllable heat transfer device that constitutes a closed circulator for evaporative liquid using vapor transfer pipes, wherein at least two sets of the heat flow controllable heat transfer devices are provided, and a first one is provided in the evaporator. The condensing heat exchanger of the heat flow controllable heat transfer device and the evaporation heat exchanger of the first heat flow controllable heat transfer device are disposed in the cooler in the heat storage tank, and a second heat flow is provided in the condenser. The condensing heat exchanger of the second heat flow controllable heat transfer device is disposed in the evaporation heat exchanger of the controllable heat transfer device and the cooler in the heat storage tank, and the first and second heat flow controllability A heat storage type refrigeration device comprising a control circuit that can alternately input input to a heater of a heat transfer device. 2. In the device described in claim 1, second and third heat storage tanks are provided in addition to the heat storage tank having a cooler, and the condensing heat of the evaporator and the first heat flow controllable heat transfer device is provided. The heat exchanger is arranged in the second heat storage tank, and the condenser and the evaporation heat exchanger of the second heat flow controllable heat transfer device are arranged in the third heat storage tank. Heat storage type refrigeration equipment. 3. In the product described in claim 2, a plurality of condensing heat exchangers of a plurality of sets of first heat flow controllable heat transfer devices are disposed in the second heat storage tank, and the second set of multiple
A plurality of evaporation heat exchangers of the plurality of sets of first heat flow controllable heat transfer devices are arranged, and a plurality of evaporation heat exchangers of the plurality of sets of first heat flow controllable heat transfer devices and the second heat flow of the plurality of sets of heat flow controllable heat transfer devices are arranged. A regenerative refrigeration device characterized in that a plurality of condensing heat exchangers of a controllable heat transfer device are respectively disposed in coolers in a thermal storage tank.