JPH0772637B2 - Operating method of heating tower type heat pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating method for a heating tower type heat pump, and more particularly to an operating method for maintaining the concentration of antifreeze during heating operation.

[0002]

2. Description of the Related Art A heating tower type heat pump that collects heat from air using an antifreeze liquid needs to keep the concentration of the antifreeze liquid within a certain range. When the antifreeze liquid is diluted, the freezing point rises and the effect of the antifreeze liquid is increased. There is a risk that it will disappear and freeze. Therefore, when diluting the antifreeze solution, the following method has been conventionally performed. (1) Add a thick antifreeze solution and concentrate the antifreeze solution. (2) When the heat pump is stopped, the antifreeze liquid is passed through the heating tower and the fan for the heating tower is operated to concentrate the antifreeze liquid. (Japanese Patent Application Sho 60-87
226) (3) Install a special antifreeze solution concentrator to concentrate the antifreeze solution. Each of these methods has the following problems. According to the method (1), the amount of the freezing point depressant, for example, ethylene glycol, in the antifreeze liquid eventually increases, and the concentration limit is approached, resulting in easy overconcentration. In the method (2), the concentration effect cannot be expected when the outside air humidity is high. In the method (3), the machine room space must be secured for the antifreeze concentrator, and the antifreeze concentrator itself is expensive. On the other hand, a heating tower type heat pump having a heat exchanger for exchanging heat between the antifreeze liquid and the heat source water in the antifreeze liquid system of the cooler is known as an operation system for simultaneously performing cooling during heating operation. (Japanese Patent Application No. 62-54169)

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and, in a heating tower type heat pump having a heat exchanger for exchanging heat between antifreeze liquid and heat source water in an antifreeze liquid system of a cooler, extra concentration An object of the present invention is to provide an operating method capable of concentrating an antifreeze solution using a heating tower type heat pump even if the outside air humidity is high without providing equipment.

[0004]

In order to achieve the above object, in the present invention, a heat exchanger for exchanging heat between antifreeze liquid and heat source water is provided in an antifreeze liquid system of a cooler to collect and exhaust heat from outside air. In the operating method of the heating tower type heat pump, if the antifreeze concentration decreases during heating operation, the heating operation is temporarily stopped and the heat pump is switched to the cooling cycle, and at the same time, the antifreeze system of the heating tower is disconnected from the cooler and cooled. An operating method of a heating tower type heat pump characterized by concentrating the antifreeze liquid by connecting to a water condenser, while the antifreeze liquid system on the cooler side circulates between the heat exchanger and the heat pump to perform cooling operation. It was done.

In the operating method of the present invention, the antifreeze liquid can be effectively concentrated even when the outside air humidity is high, and in the cooling operation for concentration, the heat source water to be passed through the heat exchanger. Is preferably cold water.

[0006]

[Operation] In this system, the antifreeze system of the heating tower is connected to the cooling water condenser, the antifreeze system of the cooler side is not circulated between the heat exchanger, and the heat pump is cooled to perform heating. In the tower, the antifreeze liquid exchanges heat with the air and at the same time releases moisture into the air to be concentrated. This operation is possible because the temperature of the antifreeze liquid is higher than the wet-bulb temperature of air even when the humidity of the air is high, and in this case, the present operation method works most effectively. When the heat source water is cold water, it is possible to concentrate the antifreeze liquid and simultaneously manufacture cold water.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings, but the present invention is not limited thereto. Example 1 FIG. 1 is a process diagram of a heating tower type heat pump used in the present invention. In FIG. 1, 1 is a cooling tower that also serves as a heating tower, 2 is a cooler, 3 is a cooling water condenser, 4 is a hot water condenser, 5 is a main compressor, 6 is a booster compressor, 7 is a heat exchanger, 8 is a brine tank, Reference numeral 9 denotes a hot water tank, 10 to 13 are pumps, 14 and 15 are expansion valves, and 16 to 25 are valves. Next, the heating operation using this heat pump will be explained. By opening the valves 16 and 17, closing the valves 18 to 23 and operating the pump 11, the antifreeze liquid is heated tower 1-tube 30-valve 1.
6-tube 31-cooler 2-tube 32-valve 27-tube 33-heating tower 1 Then, the heating tower 1 collects heat from the air and the cooler 2 radiates heat.
In the heat pump, the refrigerant takes heat from the antifreeze liquid in the cooler 2, compresses it in the main compressor 5, passes through the cooling water condenser 3 which is not operating, is further compressed in the booster compressor 6 and rises in temperature, and in the hot water condenser 4 in hot water. Heat 42. Hot water 42
The refrigerant that has been heated is decompressed by the expansion valve 15 from the pipe 28, passes through the cooling water condenser 3, passes through the pipe 29 and the expansion valve 14, and is further decompressed, and is returned to the cooler 2. The obtained warm water is stored in the warm water tank 9. The valves 24 and 25 are opened and closed by the signal of the heating tower level gauge to control the heating tower level to a predetermined level. In this operation, the cooling water is not passed through the cooling water condenser 3, and the system of the heat exchanger 7 for the antifreeze liquid and the heat source water is cut off by the valve and is not operated.

Next, the operation of concentrating the antifreeze liquid when the antifreeze liquid is diluted will be described. First, the valves 16 and 17 are closed, and the antifreeze system is divided into two systems: a system that circulates the heating tower 1 and the cooling water condenser 3, and a system that circulates the cooler 2 and the heat exchanger 7. Where the valve 18,
19, 20, 21 and 23 are opened and the pumps 11 and 12 are operated so that the antifreeze liquid is heated by the heating tower 1-
Pipe 30-valve 18-pipe 34-cooling water condenser 3-pipe 35
-Valve 19-Pipe 33-System for circulating heating tower 1, pipe 31-cooler 2-pipe 32-valve 23-pipe 38-valve 21-pipe 37-heat exchanger 7-pipe 36-valve 20-pipe 31 forms a system that circulates. The valve 22 is controlled by the heat source water outlet temperature, and a part of the brine bypasses the heat exchanger 7 to prevent the heat source water from freezing. Then, in the heat exchanger 7, heat is applied to the antifreeze liquid by the heat source water 44, and in the cooler 2, heat is applied to the refrigerant from the antifreeze liquid. In the heat pump, the refrigerant takes heat from the antifreeze liquid in the cooler 2, the temperature is raised by the main compressor, is introduced into the cooling water condenser 3, and the cooling water condenser 3 heats the antifreezing liquid. And the refrigerant is pipe 29
To the cooler 2 through the expansion valve 14. On the other hand, the antifreeze liquid heated by the cooling water condenser 3 is introduced into the heating tower to radiate heat into the air and at the same time release water to be concentrated. At this time, the booster compressor 6 is stopped, and the water flow to the hot water condenser 4 is also stopped by stopping the pump 10. Further, it is preferable to install a sensor for detecting the outside air humidity and perform the above antifreeze solution concentration operation only when the outside air humidity is high via the controller.

Example 2 FIG. 2 shows an example in which cold water is used as the heat source water of the heat exchanger and the manufactured cold water is stored in the cold water tank. 2 is the same as FIG. 1 except for the cold water system of the heat exchanger, and the same heating operation and antifreeze liquid concentration operation as in Example 1 can be performed. However, in the antifreeze concentration operation, cooler 2
The circulation system stores cold water produced by using cold water as heat source water in the cold water tank 59. The system is pump 5
At 0, cold water is introduced into the heat exchanger 7 through the pipe 55 and the valve 51, and heat is released into the antifreeze to further cool the cold water, which is circulated and stored in the cold water tank through the valve 52 and the pipe 56. .
The produced cold water can be used for cooling. Further, in this antifreeze liquid concentration operation and cooling operation, the cooler 2 circulation system can be used by circulating cold water as it is into the cooler 2 instead of the antifreeze liquid. In this case, the circulation system is the cold water tank 5
The cold water is pumped from 9 by the pump 50 to the pipe 57-valve 53-pipe 31.
-Cooler 2-pipe 32-valve 54-pipe 58-cold water tank 59 is circulated to produce cold water. In this case valves 16, 17, 2
0, 22, 23, 51, 52 are closed, and the pump 12 is stopped.

[0010]

According to the operation method of the present invention, the tendency of overconcentration due to the increase of the freezing point depressant due to the addition of the concentrated antifreeze liquid is prevented from occurring, and the antifreeze liquid can be effectively concentrated even when the air humidity is high. The heating tower type heat pump itself can be used for concentration without installing a special antifreeze concentration device.
It is also possible to produce cold water at the same time as the concentration, which is a multi-functional operation method.

[Brief description of drawings]

FIG. 1 is a process diagram showing an example of a heating tower type heat pump used in an operating method of the present invention.

FIG. 2 is a process diagram showing another example of a heating tower type heat pump used in the operating method of the present invention.

[Explanation of symbols]

1: heating tower, 2: cooler, 3: cooling water condenser, 4: hot water condenser, 5: main compressor, 6: booster compressor, 7: heat exchanger, 8: brine tank, 9: hot water tank, 10 ~ 13, 50: pump, 14, 15: expansion valve,
16-25, 52-54: valve, 26-29: refrigerant pipe,
30-41: antifreeze pipe, 42, 43: hot water pipe, 4
4: Heat source water pipe, 45: Outside air humidity sensor, 46: Controller, 55-58: Cold water pipe, 59: Cold water tank.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Rikuo Tamura 11-1 Haneda Asahi-cho, Ota-ku, Tokyo Ebara Corporation (72) Inventor Masami Ishikawa 11-11 Haneda-asahi-cho, Ota-ku, Tokyo Inside the EBARA MFG. (72) Inventor Masaki 11-11 Haneda Asahi-cho, Ota-ku, Tokyo Inside the EBARA CORPORATION (72) Inventor Teiichi Mochizuki 11-11 Haneda-Asahi-cho, Ota-ku, Tokyo Inside the EBARA MFG.

Claims (3)

[Claims] 1. A method of operating a heating tower type heat pump that has a heat exchanger for exchanging heat between antifreeze liquid and heat source water in an antifreeze liquid system of a cooler, and collects and exhausts heat from outside air. If the temperature drops, the heating operation is temporarily stopped and the heat pump is switched to the cooling cycle.At the same time, the antifreeze system of the heating tower is disconnected from the cooler and connected to the cooling water condenser, while the antifreeze system of the cooler side is the heat exchanger. A method for operating a heating tower type heat pump, characterized in that the antifreeze liquid is concentrated by circulating the heat pump to cool the heat pump. 2. The method of operating a heating tower heat pump according to claim 1, wherein the concentration of the antifreeze liquid is performed when the outside air humidity is high. 3. The method for operating a heating tower heat pump according to claim 1, wherein in the cooling operation, the heat source water passing through the heat exchanger is cold water.