JPH05113233A - Condensing pressure control system of condensation difference heat accumulation device - Google Patents

Abstract

PURPOSE:To perform a controlling operation for keeping a constant condensing pressure of compressed medium for heating for use in performing a condensation of solution under a heat accumulating operation of a condensation difference heat accumulating device. CONSTITUTION:A condensing pressure signal of the first heat exchanger 4 for condensing solution is transmitted to a controller 38 through a pressure transmitting device 36. In the case that the condensing pressure is higher than a set value, the number of rotation of an air-cooled heat exchanger fan driving motor 37 is increased and the condensing pressure is reduced. In turn, in the case that the condensing pressure is lower than the set value, the number of rotation of the air-cooled heat exchanger fan driving motor 37 is reduced so as to increase the condensing pressure. Accordingly, the condensing pressure of the heating medium compressed to perform a condensation of the solution can be controlled to become constant under a heat accumulating operation of the concentration difference heat accumulating device and then a stable operating condition can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentration difference heat storage device, and more particularly to a condensation pressure control system for a concentration difference heat storage device in which a solution is concentrated by a compressed heating medium.

[0002]

2. Description of the Related Art A conventional concentration difference heat storage device is disclosed in Japanese Patent Laid-Open No. 62-
As described in Japanese Patent No. 218773, no consideration was given to controlling the concentration pressure of the heating medium.

[0003]

In the above-mentioned prior art, when the amount of heat of condensation in the external cooling source is too large, there is a problem that the condensation pressure and temperature of the heating medium are lowered and the solution cannot be concentrated. ..

Further, when the amount of heat of condensation in the external cooling source is too small, the condensation pressure and temperature of the heating medium rise, which causes a problem that the compressor cannot be operated.

An object of the present invention is to solve the above problems and provide a good operating condition by controlling the amount of heat of condensation in an external cooling source to control the condensation pressure.

[0006]

In order to solve the above-mentioned problems, a controller for detecting the condensation pressure or temperature of a heating medium and a controller for controlling the amount of condensation heat in an external cooling source based on the data detected by the detector. Is provided so that the amount of heat of condensation in the external cooling source is controlled.

[0007]

The detector detects the condensing pressure or temperature of the heating medium. This data is transmitted to the control device, and when it is higher than the set value, the amount of heat of condensation in the external cooling source is controlled to be small. When the value is lower than the set value, the amount of heat of condensation in the external cooling source is controlled to be large.

Thereby, the condensing pressure or temperature of the heating medium is controlled to be constant.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a system diagram of the present invention. The compression type refrigeration cycle includes a turbo type, a screw type, a reciprocating type compressor 1, a driving device for driving a rotor connected to the compressor 1, a four-way switching valve connected to gas inlets / outlets 1i, 1o of the compressor 1. 3, a first heat exchanger 4 and a second heat exchanger 5 connected to the four-way switching valve 3, and air-cooled heat exchange as an external cooling source arranged between the first and second heat exchangers 4 and 5. Unit 6, air-cooling heat exchanger fan drive motor 37, pressure transmitter 36 attached to the first heat exchanger 4, these compressors 1,
Pipes 7, 8 for operatively connecting the four-way switching valve 3, the first and second heat exchangers 4, 5 and the air-cooling heat exchanger 6 to each other.
9,10,11,12,13,14,15,16, valves 17,18,19,20,21,22, first heat interposed in the middle of piping 9,10,12,13,15,16 And a control unit 38 for controlling the condensation pressure in the exchanger 4.

The first and second heat exchangers 4 and 5 are housed in a sealed container 23. This closed container 23 is
The second chambers 23A and 23B are partitioned by a heat insulating wall 24, and an absorbing liquid and a refrigerant liquid such as a mixed liquid of lithium bromide and water and ethylene glycol and Freon (hereinafter simply referred to as a mixed liquid) are injected into the inside. .. On the upper side of the partition wall 24, an opening 25 that connects the two chambers 23A and 23B is formed. A gas-liquid separation element such as an eliminator for separating droplets in the refrigerant vapor is arranged in the opening 25 as needed.

Heat exchange coils 26 and 27 are installed above the first chamber 23A and the second chamber 23B, respectively.
Also, pumps 28 and 29 having suction pipes connected to the bottom thereof, spray headers 30 installed above the heat exchange coils 26 and 27,
31, the discharge side of the pumps 28, 29 and the spray headers 30, 3
First and second spraying devices 34 and 35, which are composed of pipes 32 and 33 that communicate with 1, are installed.

Next, the operation will be described.

The valves 17, 18, 19, 20 are opened (the valve 19 is made small open to function as an expansion valve), the valves 22, 21 are closed, and the four-way switching valve 3 is communicated with an arrow A (see FIG. 1). (State shown). Further, the mixed liquid is injected into the first chamber 23A.

Due to the compression by the compressor 1, the medium vapor (generally a Freon system) becomes high temperature and high pressure, and flows through the pipe 8, the four-way switching valve 3, the pipe 9, and the valve 17 to the first heat exchanger 4, and while it flows there. The mixed liquid is heated to evaporate the refrigerant from the mixed liquid to increase the absorption liquid concentration of the mixed liquid. As a result of heating the mixed liquid, the medium of the first heat exchanger 4 is liquefied, passes through the pipe 10, the valve 18, the air-cooling heat exchanger 6, the pipe 11, the pipe 12, and the valve 19 and is decompressed by the valve 19 to It flows into the second heat exchanger 5. This medium liquid evaporates in the second heat exchanger 5, takes the latent heat of evaporation from the surroundings (the second chamber 23B), evaporates in the first chamber 23A, and flows in through the opening 25. The refrigerant vapor in the room 23B is liquefied and stored at the bottom of the room 23B. The medium vapor evaporated in the second heat exchanger 5 returns to the compressor 1 via the pipe 13, the valve 20, the pipe 14, the four-way switching valve 3 and the pipe 7, and is compressed by the compressor 1 again.
While continuing this operation, the mixed liquid in the first chamber 23A is concentrated, the concentration of the absorbing liquid becomes higher, and the second chamber 2
A refrigerant liquid obtained by condensing the refrigerant vapor evaporated in the first chamber 23A is stored in 3B. As a result, the mixed liquid in the first chamber 23A has a large absorption capacity, and if it absorbs the refrigerant vapor, it produces a heat of absorption, in other words, it stores heat. Further, the refrigerant liquid in the second chamber 23B has the ability to evaporate because it is in a liquid state, and therefore, it stores the cooling power corresponding to the latent heat of evaporation at the time of evaporation, that is, it stores cold. ..

Here, the pressure transmitter 36 attached to the first heat exchanger 4 sends a condensing pressure signal of the medium to the controller 38. When the condensing pressure is lower than the set pressure, the control unit 38 lowers the rotation speed of the air-cooling heat exchanger fan drive motor 37 to reduce the amount of heat exchanged in the air-cooling heat exchanger 6, thereby reducing the heat exchange amount of the first heat exchanger 4. Increase condensing pressure. In addition, the control unit 38
If the condensing pressure is higher than the set pressure, the rotation speed of the air-cooling heat exchanger fan drive motor 37 is increased to increase the amount of heat exchanged in the air-cooling heat exchanger 6 to increase the condensing pressure of the first heat exchanger 4. Lower.

In this way, the condensing pressure of the first heat exchanger 4 is controlled to be constant, and a stable heat storage operation state is provided.

[0018]

According to the present invention, since the condensing pressure of the first heat exchanger during the heat storage operation can be controlled to be constant, a stable operation state can be provided.

[Brief description of drawings]

FIG. 1 is a system diagram of an example of a condensing pressure control system of a concentration difference heat storage device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Compressor drive motor, 3 ... Four-way switching valve, 4 ... 1st heat exchanger, 36 ... Pressure transmitter, 37 ... Air-cooling heat exchanger fan drive motor, 38 ... Control part.

Claims (1)

[Claims] 1. A first and a second chamber in the form of a closed container, into which a refrigerant, an absorbent or a solution in which these are mixed are injected, and a steam passage for connecting the first and the second chambers to each other. And a second heat exchanger installed in the first room and a first heat exchanger installed in the second room,
A compressor connected to the first and second heat exchangers,
An external cooling source connected to the discharge side of the compressor, and a solution spraying device separately installed in the first and second chambers, respectively, the first heat exchanger and the second heat exchanger. The heating medium vapor compressed by the heating medium compressor is circulated in one of the heat exchangers and the external cooling source, and the medium liquid that has flowed out of the one of the heat exchangers and the external cooling source as a cooling medium in the remaining heat exchangers. In one of the heat exchangers, the solution is heated to generate a refrigerant vapor to concentrate the solution, and the absorption capacity of the solution is increased. In the concentration difference heat storage device that cools and liquefies the refrigerant vapor generated in the exchanger to dilute the concentration of the solution, enhances the evaporation ability of this solution, and increases or decreases the amount of cooling heat in the external cooling source in the concentration difference heat storage device that stores heat energy. The heating medium vapor condenses Condensation pressure control method of the density difference the heat storage apparatus characterized by controlling the pressure.