JPH035643A - Capacity control method for cold accumulator and its apparatus - Google Patents

Abstract

PURPOSE:To obtain a capacity control device for a cold accumulator minimizing wasteful energy release by installing capacity control means at a room heating and concentrating solution and a primary side of a solution dispersion and circulation system for the room, that is, a heat accumulating system using temp. difference. CONSTITUTION:The load condition is detected by a detecting element 41 for cold water temp. attached at the outlet part of cold water of a load 40 and is response to the load a flow control valve 42 for solution is opened and closed to change the dispersion amount of the solution from a solution spray nozzle 32A and the capacity is controlled by changing the absorption amount of refrigerant vapor into the solution in a primary room 23A. Here, the opening and closing of the valve 42 for the solution causes the discharge pressure of a solution pump 30 to change, however, at this time the revolution of the pump 30 is controlled by a revolution control device 44 so that the discharge pressure is constant at the pressure detecting element of the discharge part of the pump 30. Thus, wasteful pump power is saved and the control of the discharge pressure contributes to the stable supply of the solution to a high location and is also utilized for heat reserve.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method and device for controlling the capacity of a cold storage heat storage device, and in particular to energy-saving capacity control by varying the amount of solution sprayed in a cold storage heat storage device of a temperature difference heat storage system. The present invention relates to a capacity control method of a cold storage heat storage device suitable for

[Prior art] A conventional temperature difference heat storage system is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-2
As described in Japanese Patent No. 18773, a compression refrigeration cycle, a first chamber containing a solution that exchanges heat with the first heat exchanger of the compression refrigeration cycle, and a second heat exchanger. and a second chamber containing a solution that transfers heat. It is connected to the second chamber by a vapor passageway through which the vapor of the refrigerant contained in the solution passes.
Heating and concentrating the solution in either the first or second chamber by the first heat exchanger and the second heat exchanger,
The evaporated refrigerant vapor is introduced into the other chamber through the vapor passage and liquefied in the other chamber. This created a concentration difference in the solution in the second chamber and stored heat.

[Problems to be Solved by the Invention] The above-mentioned prior art discloses the entire system of the concentration difference heat storage system, but does not disclose any capacity control method.

In the technique described in the above-mentioned Japanese Patent Application Laid-Open No. 62-218773,
1st. In the second room, for example, the cold water side that flows through the second heat exchange coil provided in the second room (for example, the load side in a cold water system that supplies air conditioning equipment), that is, the secondary side in a temperature difference heat storage system The only thing that had been done was to install some sort of adjustment device.

The present invention was made to solve the problems in the conventional steam technology, and includes a room for heating and concentrating a solution and a solution distribution circulation system on the side of the room (these are referred to as the solution side), that is, the primary side of a temperature difference heat storage system. It is an object of the present invention to provide a capacity control method and device for a cold storage heat storage device that minimizes wasteful energy release by providing capacity control means in the device.

Note that the secondary side of the system here refers to the first side. This refers to the inside of the tube of the second heat exchange coil. In other words, it receives a certain amount of heat from the heat storage device through the heat transfer tube and supplies it to the equipment's air conditioning equipment (load side) as cold water or cooling water.
From the perspective of the cold storage heat device, the first. The fluid flowing in the tubes of the second heat exchanger coil is the partner with which heat is exchanged and is therefore referred to as the secondary side.

On the other hand, the above-mentioned 1. The cold storage heat device other than the tube inner side of the second heat exchange coil is referred to as the primary side.

[Means for Solving the Problems] In order to achieve the purpose of steam, the capacity control device for the cold storage heat storage device according to the present invention has the following configuration: A refrigerant, an absorbent, or a solution of a mixture thereof is injected into the inside. first and second chambers in the shape of a sealed container; a steam passage connecting the first and second chambers;
a first heat exchanger installed in the first room; a second heat exchanger installed in the second room; a compressor connected to the first and second heat exchangers; and a dispersion device and a heat medium distribution heat exchanger tube installed separately in the second room, and the first heat exchanger and the second heat exchanger provide one of the first and second rooms. The solution in the first chamber is heated and concentrated, and the evaporated refrigerant vapor is introduced into the other chamber through the vapor passage and liquefied in the other chamber.
In a control device for a cold storage heat device, the control circuit is configured to store heat by creating a concentration difference in the solution in the second room,
A solution piping system constituting a solution dispersion device on the side of the room in which the solution is heated and concentrated is equipped with a solution pump equipped with a rotation speed control device and a flow rate adjustment valve that changes the amount of solution in response to load fluctuations. It is something.

In addition, in order to achieve the above object, the configuration of the capacity control method for a cold storage heat storage device according to the present invention includes a refrigerant, an absorbent,
Alternatively, a first and second chamber shaped like a closed container into which a mixed solution of these is injected, a steam passage connecting the first and second chambers, and a steam passage installed in the first chamber. 1 heat exchanger and a 2nd heat exchanger installed in the second room.
A heat exchanger, a compressor connected to the first and second heat exchangers, a dispersion device and a heat medium circulation heat exchanger tube installed separately in the first and second rooms, and the first
The refrigerant vapor compressed by the compressor is circulated through one of the heat exchangers and the second heat exchanger, and the refrigerant liquid after leaving one heat exchanger is used as a cooling medium in the other heat exchanger. One heat exchanger heats the solution in the chamber to generate refrigerant vapor and concentrate the solution, increasing the absorption capacity of this solution, while the other heat exchanger heats the solution in one chamber and concentrates the solution. In a capacity control method for a cold heat storage device that stores thermal energy by cooling and liquefying refrigerant vapor generated in a chamber to dilute the concentration of a solution in a room and increasing the evaporation capacity of this solution.

The solution piping system that constitutes the solution dispersion device on the side of the room where the solution is concentrated is equipped with a solution pump equipped with a rotation speed control device and a flow rate adjustment valve, and a load fluctuation detection means is provided on the load side, and the detected load is The flow rate adjustment valve of the solution is opened and closed according to the flow rate adjustment valve, and the pressure detection means detects the fluctuation in the discharge pressure of the solution pump, which is caused by the opening and closing of the flow rate adjustment valve, and the discharge pressure is adjusted to be constant. This controls the rotation speed of the solution pump.

[Operation] The operation of the above technical means, especially the capacity control method, is as follows.

In the capacity control method of the present invention, first, a cold water temperature detection end that detects a load change sends an open/close signal to a flow rate adjustment valve installed in a solution line depending on the magnitude of the load change. As a result, the flow rate adjustment valve opens and closes, and as a result, the pressure on the downstream side of the valve increases, but the rotation speed control device attached to the solution pump works to keep the pressure constant, enabling energy-saving capacity control. .

[Example] An embodiment of the present invention will be described below with reference to the drawings.

The drawing is a system diagram of a cold storage heat device according to an embodiment of the present invention.

The compression type refrigeration cycle shown in the figure includes a turbo type, screw type, or reciprocating type compressor 1, a drive unit 2 connected to this compressor 1 and driving the rotor of the compressor 1, and a gas of the compressor 1. Four-way switching valve 3 connected to inlet/outlet II, 1o
, a first heat exchanger 4 and a second heat exchanger 5 connected to this four-way switching valve 3; Second heat exchanger 4.5
The air-cooled heat exchanger 6 installed between them, the compressor 1, the four-way switching valve 3, the first . Piping 7, 8°9.10 that operatively connects the second heat exchangers 4, 5 and the air-cooled heat exchanger 6 to each other
, 11, 12, 13, 14, 15, 16, piping 9, 10
, 11, 12, 13, 15, 16, and valves 17, 18, 19, 20, 21, and 22.

Said 1st. The second heat exchangers 4 and 5 are housed in a sealed container 23. This airtight container 23 is.

1st. The second chambers 23A and 23B are divided by a heat insulating wall 24, into which an absorbing liquid and a refrigerant liquid such as a mixed liquid of lithium bromide, water, ethylene gelcole and Freon (hereinafter simply referred to as a solution) are injected. An opening 25 is formed on the upper side of the zero section wall 24 to communicate the two chambers 23A and 23B.

A gas-liquid separation element such as an eliminator for separating droplets in the refrigerant vapor is arranged in the opening 25 as necessary.

1st. The first section related to the heating tube through which the heat medium flows is located in the upper part of the second chambers 23A and 23B. A second heat exchange coil 26,27 is arranged.

Also, 1st. A solution pump 3 is connected to a tank 28, 29 and a suction pipe at the bottom of the second chambers 23A and 23B, respectively.
0. A refrigerant pump 31 is provided.

1st. A solution spray nozzle 32A and a refrigerant spray nozzle 32B are provided above the second heat exchange coils 26 and 27, and the solution pump 30. A pipe 33.34 connecting the discharge side of the refrigerant pump 31 connects the first and second dispersion devices 35.3.
6 are configured.

A heat medium, such as cooling water, flows through the first heat exchange coil 26, and this cooling water system is equipped with a cooling water pump 37 and an air heat exchanger 38. Furthermore, a heat medium, such as cold water, flows through the second heat exchange coil 27, and this cold water system is equipped with a cold water pump 39. 40 indicates the load of, for example, air conditioning equipment.

Reference numeral 41 denotes a cold water temperature detection end that detects load fluctuations in the load 40; 42 represents a flow rate adjustment valve provided in the piping 33 related to the solution line; The valve opening degree is adjusted accordingly.

Further, the solution pump 30 is equipped with a rotation speed control device 44 that can vary the rotation speed based on a signal from a pressure detection end 43.

Next, the operation will be explained.

Cold storage heat operation: Valve 17, 18, 19, 20 is opened (valve 18 or valve 19 is opened slightly to function as an expansion valve), valve 22, 21 is closed, and the communication direction of the four-way switching valve 3 is aligned with the solid line arrow A. I will make it happen. Further, a solution is injected into the first chamber 23A.

By compression by the compressor 1, the refrigerant vapor (generally fluorocarbon-based) becomes high temperature and high pressure, and the pipe 8. Four-way switching valve 3. Piping 9
．． The solution flows through the valve 17 to the first heat exchanger 4, and while flowing there, heats the solution in the first chamber 23A, evaporates the refrigerant from the solution, and increases the absorption liquid concentration of the solution. As a result of heating the solution, the refrigerant in the first heat exchanger 4 liquefies and the pipe 10. Valve 18° Air-cooled heat exchanger 6. Piping 11. Piping 12. It passes through the valve 19, is depressurized by the valve 18 or 19, and flows into the second heat exchanger 5.

This refrigerant liquid evaporates in the second heat exchanger 5 and evaporates in the second heat exchanger 5.
The latent heat of vaporization is removed from the first room 23B) and the first room 23A
The second chamber 2 is evaporated and flows into the second chamber 2 through the opening 25.
The refrigerant vapor in 3B is liquefied and stored in a tank 29. Second
The refrigerant vapor evaporated in the heat exchanger 5 is transferred to the pipe 13. valve 20
．． Piping 14° Four-way switching valve 3. Compressor 1 via piping 7
, and is again compressed by compressor 1.

In the above process, the solution in the first chamber 23A passes through the tank 28, is pressurized by the solution pump 30, and is pumped into the pipe 3.
3. The solution can also be sprayed from the solution spray nozzle 32 via the first spraying device 35 to heat the first heat exchanger 4 . At this time, the flow rate adjustment valve 42 is fully opened so that the amount of heat stored per unit time is maximized.

While the above-mentioned operation continues, the solution in the first chamber 23A becomes concentrated and the absorbent concentration becomes higher, and the solution in the second chamber 23A becomes concentrated.
3B stores a refrigerant liquid obtained by condensing refrigerant vapor evaporated in the first chamber 23A. This allows the first
The solution in the room 23A has a large absorption capacity, and if it absorbs refrigerant vapor, it will generate absorption heat, in other words, it will be storing heat. Also, the second room 23
Since the refrigerant liquid B is in a liquid state, it has the ability to evaporate, and therefore stores cooling power corresponding to the latent heat of evaporation during evaporation, that is, stores cold.

Cold storage heat extraction operation: When extracting the cold storage heat performed in the operation described above, 1. The second dispersion device 35, 36 is operated, and the heat medium (cooling water) is supplied to the first and second heat exchange coils 26, 27.

(cold water) is circulated. At this time, the refrigerator is stopped. If the stored cold heat alone is insufficient for the amount of heat, it is also possible to extract the stored cold heat while operating the refrigerator.

The refrigerant liquid in the second chamber 23B passes through the tank 29, is sprayed by the refrigerant pump 31 from the refrigerant spray nozzle 33 to the second heat exchange coil 27, and evaporates.

When the refrigerant evaporates, latent heat of evaporation is removed from the cold water flowing through the second heat exchange coil 27, thereby cooling the cold water.

This provides cooling power. The refrigerant vapor evaporated in the second chamber 23B flows into the first chamber 23A through the opening 25.

In addition, the solution with high absorption liquid concentration in the first chamber 23A is
The refrigerant vapor is sprayed from the solution spray nozzle 32 to the first heat exchange coil 26 by the solution pump 30 and absorbs the refrigerant vapor evaporated in the second chamber 23B.

The cooling water passing through the first heat exchange coil 26 is heated by the absorption heat generated during absorption, and its temperature increases. This allows the stored heat to be extracted.

Next, the variable cooling power extraction amount operation will be explained.

First, assuming that the cooling power is for air conditioning equipment, a load of 40 is assumed.

The load condition is detected by a cold water temperature detection end 41 attached to the cold water outlet of the load 40, and the solution flow rate adjustment valve 42 is opened and closed according to the load to change the amount of solution sprayed from the solution spray nozzle 32A.

The capacity is controlled by changing the amount of refrigerant vapor absorbed into the solution in the first chamber 23A. Here, the solution flow rate adjustment valve 42
The discharge pressure of the solution pump 30 fluctuates by opening and closing, but at this time, the rotation speed control device 44 is operated so that the discharge pressure is constant at the pressure detection end of the discharge section of the solution pump 30.
The rotation speed of the solution pump 30 is controlled using.

By doing as described above, unnecessary pump power is saved, and controlling the discharge pressure greatly contributes to stable supply of solution to high positions.

Furthermore, the above method can also be used for heat storage.

According to this embodiment, by adjusting the opening degree of the solution flow rate adjustment valve, not only the amount of solution according to the load in the solution line is controlled, but also the rotation speed of the solution pump is controlled at the same time, resulting in efficiency of operating power. It is possible to use it in a variety of ways.

Furthermore, since the pressure for supplying the solution to the solution spray nozzle can be kept constant, the characteristics of the nozzle can be effectively utilized.

[Effects of the Invention] As explained in detail above, according to the present invention, capacity control is provided in the room for heating and concentrating the solution and the solution distribution circulation system (solution side) on the side of the room, that is, on the primary side of the temperature difference heat storage system. It is possible to provide a capacity control method and device for a cold storage heat storage device that minimizes wasteful energy release by providing means.

[Brief explanation of drawings]

The drawing is a system diagram of a cold storage heat device according to an embodiment of the present invention. 1... Compressor, 4... First heat exchanger, 5... Second
Heat exchanger, 23A...first chamber, 23B...second
room, 24... partition wall, 25... opening, 26...
・First heat exchange coil, 27...Second heat exchange coil, 3
0...Solution pump, 31...Refrigerant pump, 35...
・First spreading device, 36... Second spreading device, 40・
...Load, 41...Cold water temperature detection end, 42...Flow rate adjustment valve, 43...Pressure detection end, 44...Rotation speed control device.

Claims (1)

[Claims] 1. A first and second chamber shaped like a closed container into which a refrigerant, an absorbent, or a solution of a mixture thereof is injected, and the first and second chambers are connected to each other. a first heat exchanger installed in the first chamber, a second heat exchanger installed in the second chamber, and connected to the first and second heat exchangers; It is equipped with a compressor, a dispersion device and a heat medium distribution heat exchanger tube installed separately in a first and second room, and the first and second heat exchangers Heat and concentrate the solution in one of the chambers,
The control circuit was configured to introduce the evaporated refrigerant vapor into the other chamber through the vapor passage and liquefy it in the other chamber, thereby creating a concentration difference between the solutions in the first and second chambers and storing heat. In the control device for the cold storage heat device, the solution piping system constituting the solution distribution device on the side of the room where the solution is heated and concentrated includes a solution pump equipped with a rotation speed control device and a solution pump that changes the amount of solution in response to load fluctuations. 1. A capacity control device for a cold storage heat storage device, comprising a flow rate adjustment valve for controlling the flow rate. 2. First and second chambers in the form of a closed container into which a refrigerant, an absorbent, or a solution of a mixture thereof is injected, and a steam passageway communicating between the first and second chambers; a first heat exchanger installed in the first room; a second heat exchanger installed in the second room; a compressor connected to the first and second heat exchangers; and a dispersion device and a heat medium distribution heat exchanger tube installed separately in the second room, and the refrigerant vapor compressed by the compressor is supplied to one of the first heat exchanger and the second heat exchanger. The refrigerant liquid after leaving one heat exchanger is circulated as a cooling medium to the other heat exchanger, and the one heat exchanger heats the solution in the room to generate refrigerant vapor. In the other heat exchanger, the refrigerant vapor generated in one heat exchanger is cooled and liquefied to dilute the concentration of the solution in the room. In a method for controlling the capacity of a cold heat storage device that increases the evaporation capacity of a liquid and stores thermal energy, a solution pump equipped with a rotation speed control device and a solution piping system that constitutes a solution distribution device on the side of the room where the solution is concentrated are added. A flow rate adjustment valve is provided, and a load change detection means is provided on the load side, and the flow rate adjustment valve of the solution is opened and closed according to the detected load, and the discharge pressure of the solution pump is changed due to the opening and closing of the flow rate adjustment valve. 1. A capacity control method for a cold storage heat storage device, comprising: detecting the discharge pressure by a pressure detection means, and controlling the rotation speed of the solution pump so that the discharge pressure is constant. 3. first and second chambers in the form of a sealed container into which a refrigerant, an absorbent, or a solution of a mixture thereof is injected; and a steam passageway that communicates the first and second chambers; a first heat exchanger installed in the first room; a second heat exchanger installed in the second room; a compressor connected to the first and second heat exchangers; and a dispersion device and a heating medium distribution heating tube installed separately in the second room, and the refrigerant vapor compressed by the compressor is supplied to one of the first heat exchanger and the second heat exchanger. The refrigerant liquid after leaving one heat exchanger is circulated as a cooling medium to the other heat exchanger, and the one heat exchanger heats the solution in the room to generate refrigerant vapor. In the other heat exchanger, the refrigerant vapor generated in one heat exchanger is cooled and liquefied to dilute the concentration of the solution in the room. In a method for controlling the capacity of a cold heat storage device that increases the evaporation capacity of a liquid and stores thermal energy, a solution pump equipped with a rotation speed control device and a solution piping system that constitutes a solution distribution device on the side of the room where the solution is concentrated are added. and a flow rate adjustment valve, the flow rate adjustment valve is fully opened, and the solution pump is used to spray the solution onto the heat exchanger via the solution spraying device to heat and concentrate the solution in the solution concentration chamber. A method for controlling the capacity of a cold storage heat storage device.