JP2523863B2 - Cooling system - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a cooling device, and mainly cools cooling water for cooling various mechanical equipment to a set temperature range with a minimum energy corresponding to the temperature of the outside air. The present invention also relates to an energy-saving cooling device having a high cooling efficiency, which is formed so as to be heated when necessary.

[Prior Art] Conventionally, a cooling device shown in Fig. 2 disclosed in Japanese Utility Model Publication No. 61-84480 has been devised.

The compressor 12 is provided in a cooling unit 1 provided with a water spray tank 5 for spraying a pipe 2 for cooling a fluid to be cooled, a water receiver tank 6, a water supply passage 8 and a fan 10 for discharging heat released from the pipe 2 to the outside. , A condenser 13, an expansion valve 14, and a condenser 15 are attached, and the condenser 13 is arranged between the pipe 2 and the water receiving tank 6, and the condenser 13 is arranged together with the pipe 2 by the water sprinkling mechanism of the cooling device. It is also designed to be cooled. Then, a thermostat 20 is provided in the pipe that is sent from the cooling unit 1 to the evaporator 15 of the cooler to adjust the amount of water spray and the operation of the fan 10 when the temperature of the fluid to be cooled falls below the set range, and from the evaporator 15 A thermostat 21 was installed in the pipe to be sent to the outside to activate the cooler when the temperature of the fluid to be cooled exceeds the set range, suppressing power consumption during the winter when the outside air temperature is low throughout the year and enabling energy-saving cooling. It is a cooling device.

[Problems to be Solved by the Invention] The above cooling device is very effective as a cooling device capable of cooling with energy saving, but when the outside air temperature is high such as in the summer, the compressor 12, the condenser 13, and the condenser 13, Expansion valve 14,
Although the evaporator 15 is operated, the condenser 13 of the cooler is cooled by the sprinkling mechanism of the cooling device, so the temperature of the cooling water accumulated in the water receiving tank 6 rises by the amount of cooling the condenser 13,
The cooling efficiency at the time of cooling the fluid to be cooled by sprinkling water on the pipe 2 is reduced.

The present invention solves the above problems and does not lower the cooling efficiency of the cooling unit 1 even when the cooler is operated, and can keep the temperature of the fluid to be cooled constant and heat it when necessary. A cooling device is provided.

[Means for Solving the Problems] The gist of the present invention is to provide a cooling unit in which heat transfer pipes for cooling are stacked in a plurality of layers, a sprinkler tank provided above the cooling unit and sprinkling water on the cooling unit, and below the cooling unit. The water sprinkling mechanism that consists of a water receiving tank that receives water sprinkled in the water, a water passage that sends the water in this water receiving tank to the water sprinkling tank, and a fan that ventilates the heat released by the cooling unit to force it to the outside. Two cooling towers are provided, and one of the two cooling towers is provided so that the refrigerant of the compression refrigeration cycle can pass through, and an expansion valve, an evaporator, and a compressor are provided as a condenser. A return pipe for forming a compression type refrigeration cycle and passing a fluid to be cooled returned from the outside to the other cooling tower of the two cooling towers, and a connecting pipe for passing the cooling fluid from the cooling tower to the evaporator of the refrigeration cycle. It has a delivery pipe that sends it out from the evaporator. A thermostat that detects the temperature of the fluid to be cooled and issues a signal is installed in the pipe, and when the temperature of the fluid to be cooled exceeds the set temperature, the cooling capacity of the cooling tower through which the fluid to be cooled passes is increased as appropriate. After the cooling capacity of the cooling tower reaches a certain amount, the compressor of the compression refrigeration cycle is operated and cooled by the cooling tower and the evaporator, and when the temperature of the fluid to be cooled falls below the set temperature, first Is stopped and then the cooling capacity of the cooling tower is appropriately reduced.

Further, the two cooling towers and one of the two cooling towers are provided so as to pass the refrigerant of the compression refrigeration cycle as a condenser, and are provided with an expansion valve, an evaporator, and a compressor. A return pipe for forming a compression type refrigeration cycle and passing a fluid to be cooled returned from the outside to the other cooling tower of the two cooling towers, and a connecting pipe for passing the cooling fluid from the cooling tower to the evaporator of the refrigeration cycle. Provided with a delivery pipe for sending from the evaporator to the outside, provided with a bypass pipe between the return pipe and the communication pipe, the bypass pipe through which the fluid to be cooled flows, and a valve device for opening and closing the flow path of the bypass pipe, A directional switching valve that switches the flow of the refrigerant between the forward and reverse directions is provided at the portion where the refrigerant flows in and out, and when heating the fluid to be cooled, the valve device is opened so that the fluid flows through the bypass pipe and the directional switching valve is Rikae refrigerant compression refrigeration cycle to flow contrary to the cooling Te, a cooling device is characterized in that so as to heat the fluid exerts a evaporator during cooling as a condenser.

[Operation] As described above, according to the present invention, the cooling tower for cooling the fluid to be cooled and the cooling tower for cooling the refrigerant of the compression refrigeration cycle are independently provided and cooled. As compared with the case where the condenser of the fluid to be cooled is cooled by the cooling tower together with 1, the temperature of water sprinkled in the cooling unit does not rise unlike the conventional case even when the compressor is in operation. Therefore, the cooling efficiency of the cooling tower that cools only the fluid to be cooled is improved, and the load of cooling by the evaporator in the subsequent stage is reduced accordingly. Furthermore, since the cooling efficiency in the cooling tower that cools only the refrigerant is also improved, the operating efficiency of the compression refrigeration cycle is improved, the power consumption is reduced, and the fluid to be cooled at a constant temperature can be supplied with energy saving throughout the year. .

Also, under the condition that a bypass pipe is provided between the return pipe and the connecting pipe and a direction switching valve that switches the flow of the refrigerant in the compressor between forward and reverse directions is provided, the refrigerant of the compression refrigeration cycle radiates or absorbs heat in an independent cooling tower. If it is necessary to heat the fluid in winter, etc., the directional switching valve switches the flow of the refrigerant in the opposite direction to that in the case of cooling, and the evaporator during cooling works as a condenser. The fluid to be cooled can be heated here without being cooled in the cooling tower. Therefore, together with the improvement of the cooling efficiency, the fluid to be cooled in the set temperature range can be efficiently obtained throughout the year.

FIG. 1 shows an embodiment of the present invention. The cooling device of the present invention comprises approximately two cooling towers A and B and a chiller 3 of a compression type refrigeration cycle provided below them. The cooling tower A for cooling the fluid to be cooled and the cooling tower B for cooling the refrigerant may have different shapes and sizes, but have substantially the same structure, and will be described in common for convenience.

31 is a cooling part, which is a heat transfer pipe with good heat conduction such as a copper pipe 32
Are formed in multiple layers. An inlet header 33 is provided on the inner peripheral side of the heat transfer pipe 32, and an outlet header 33 is provided on the outer peripheral side.
34 is provided, and the cooling target fluid or refrigerant is the inlet header 33.
Flow through the heat transfer pipe 32 to the outlet header 34,
It is designed to cool while passing through the heat transfer pipe 32.

A sprinkler tank 35 is provided above the cooling section 31 and a water receiving tank 36 is provided below the cooling section 31, and the water sprinkling water from the sprinkling tank 35 to the cooling section 31 is received by the water receiving tank 36 via the valves 81 and 82. It is like this. The water in the water receiving tank 36 is sent to the water spraying tank 35 through the water supply passage by the pump 37 to form a watering mechanism.

A fan 40 that is rotated by a motor 39 is provided above the sprinkler tank 35, and the rotation of the fan 40 draws in air from an air inlet 41 on the side of the cooling unit 31 and removes the heat released by the cooling unit 31. It is forcibly discharged to the outside world.

On the other hand, the condenser 43 of the compression refrigeration cycle including the compressor 42, the condenser 43, the expansion valve 44, and the evaporator 45 is arranged in the cooling tower B to cool the refrigerant, and the compressor 42, the expansion valve 44, and the evaporation vessel
45 is arranged below the above-mentioned two cooling towers A and B.
The compressor 42 is provided with a direction switching valve 56,
By switching 56, the flow of the refrigeration cycle refrigerant is reversed. The fluid to be cooled is sent from the outlet header 34 of the cooling tower A to the evaporator 45 through the connecting pipe, and the evaporator 45 pumps 46.
Is sent to the equipment 48 to be cooled through the delivery pipe 47 for cooling. The cooled fluid after cooling is the return pipe.
It is formed so as to return from 49 to the inlet header 33 of the cooling unit 31, and can be opened and closed between the return pipe 49 and the connecting pipe from the outlet header 34 of the cooling unit 31 to the evaporator 45, which is normally closed. A bypass pipe 55 having a valve device 57 is provided. The structure of the compression type refrigerating cycle is such that a refrigerant such as Freon is compressed by the compressor 42 and radiated by the condenser 43 of the cooling tower B, the high pressure refrigerant liquid is converted into the low pressure refrigerant liquid by the expansion valve 44 and evaporated by the evaporator 45. Then, heat is absorbed and the fluid to be cooled passing through the evaporator 45 is cooled. By switching the refrigeration cycle to the opposite cycle by switching the switching valve 58, it is possible to cause the evaporator 45 to function as a condenser and heat the fluid to be cooled passing through the evaporator 45.

Then, the delivery pipe 47 for sending from the evaporator 45 to the device 48 to be cooled
The temperature of the fluid to be cooled is measured by installing a thermostat 51 in the.If the set temperature is set to 25 ± 1.5 ° C, the thermostat 51 will operate when the temperature of the fluid to be cooled becomes 23.5 ° C or less. First, the operation of the compressor 42 is stopped,
If the temperature of the cooled fluid is still below 23.5 ° C,
Next, the valve 81 of the water spray tank 35 is adjusted so that the amount of water sprayed from the water spray tank 35 is sequentially stopped from the inside of the heat transfer pipe 32. Even if the water spray amount is adjusted and stopped, the temperature of the fluid to be cooled is still 23.5 ° C.
If it is the following, the operation of the fan 40 is stopped.

Further, when the temperature of the fluid to be cooled becomes 26.5 ° C. or higher, the valve 81 is adjusted so that the amount of water sprinkled from the water sprinkling tank 35 is increased in order from the inside of the heat transfer pipe 32, and thereafter the temperature of the fluid to be cooled is adjusted. When the temperature is 26.5 ° C. or higher, the compressor 42 of the next cooler is operated to further evaporate the water cooled in the upper cooling tower B by the evaporator 45.
To cool by.

After the operation of the device 48 to be cooled starts, the cooling water temperature gradually rises and reaches the predetermined 25 ° C ± 1.5 ° C, and then the device 48 enters the normal operating state, but in order to shorten the rise time of the device 48 Requires heating the fluid to be cooled. In addition, it is necessary to heat the device 48 side to be cooled in the winter. In this case, the valve device 57 is switched so that the fluid to be cooled flows from the return pipe 49 through the bypass pipe 55 to the evaporator 45, and the switching valve 56 of the compressor 42 is switched to switch the compressor.
The cooling cycle by 42 is reversed from that at the time of cooling, and the condenser 43 is used as an evaporator and heat is absorbed while the evaporator 45 is used as a condenser.

In this case, the temperature of the fluid to be cooled has an upper limit of 26.5 ° C.
And the operation of the compressor 42 is stopped to keep the temperature within the set temperature range.

The cooling capacity of the cooling unit 31 may be adjusted by controlling the water spray pump 37 with an inverter or by changing the amount of air blown by the fan 39. Further, the cooling capacity of the cooler may be adjusted by controlling the compressor 42 by an inverter, or by controlling the number of a plurality of compressors.

As described above, the condenser 43 is arranged in the independent cooling tower B, and the condenser 43 is provided with the bypass pipe 55, the valve device 57 and the switching valve 56 so that the fan 40 and the water sprinkler radiate or absorb heat. Since the temperature of the sprinkled water does not rise and the cooling efficiency in the cooling unit 31 does not decrease as in the conventional case, the cooling efficiency is improved, and when it becomes necessary to heat in winter etc., the switching valve Since it is possible to switch between the bypass pipe 55 and the bypass pipe 55 for heating, the fluid to be cooled in the set temperature range can be obtained with energy saving throughout the year.

[Effect] As described above, this cooling device has a high cooling efficiency and can supply the cooling water having the desired set temperature throughout the year with the minimum energy.

[Brief description of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing a conventional example. 31 …… Cooling part, 32… Heat transfer pipe, 33 …… Inlet header, 34 …… Outlet header, 35 …… Sprinkler tank, 36 …… Water receiving tank, 38 …… Water passage, 40 …… Fan, 42 …… Compressor, 43 …… Condenser, 44 …… Expansion valve, 45 …… Evaporator, 49 …… Return pipe, 51 …… Thermostat, 55 …… Bypass pipe, 56 …… Directing valve, 81,82 …… valve,

Claims (2)

(57) [Claims] 1. A cooling section having a plurality of layers of cooling heat transfer pipes, a water sprinkler tank provided above the cooling section for sprinkling water to the cooling section, and a water receiving tank provided below the cooling section for receiving sprinkled water. And two cooling towers consisting of a water sprinkling mechanism consisting of a water supply channel that sends the water of this water receiving tank to the water sprinkling tank, and a fan that ventilates the heat released by the cooling unit to forcibly discharge it to the outside. One of the cooling towers is installed to pass the refrigerant of the compression refrigeration cycle as a condenser, and an expansion valve, an evaporator, and a compressor are provided to form a compression refrigeration cycle. A return pipe for passing the returned cooling target fluid to the other cooling tower of the two cooling towers, a connecting pipe for passing the cooling target fluid to the evaporator of the refrigeration cycle from the cooling tower, and a delivery pipe for sending the cooling target fluid to the outside. The temperature of the fluid to be cooled is detected in the pipe. A thermostat that emits a signal is provided, and when the temperature of the fluid to be cooled exceeds a set temperature, the cooling capacity of the cooling tower through which the fluid to be cooled passes is appropriately increased to cool it, and the cooling capacity of the cooling tower reaches a predetermined amount. After that, the compressor of the compression type refrigeration cycle is operated and cooled by the cooling tower and the evaporator.When the temperature of the fluid to be cooled falls below the set temperature, first stop the compressor, then increase the cooling capacity of the cooling tower. A cooling device characterized by being appropriately reduced. 2. A cooling section in which heat transfer pipes for cooling are stacked in a plurality of layers, a sprinkler tank provided above the cooling section for sprinkling water to the cooling section, and a receiving tank provided under the cooling section for receiving sprinkled water. And two cooling towers consisting of a water sprinkling mechanism consisting of a water supply channel that sends the water of this water receiving tank to the water sprinkling tank, and a fan that ventilates the heat released by the cooling unit to forcibly discharge it to the outside. One of the cooling towers is installed to pass the refrigerant of the compression refrigeration cycle as a condenser, and an expansion valve, an evaporator, and a compressor are provided to form a compression refrigeration cycle. A return pipe for passing the returned cooling target fluid to the other cooling tower of the two cooling towers, a communication pipe for passing from the cooling section to the evaporator of the refrigeration cycle, and a delivery pipe for sending the cooling target fluid to the outside. A cooling flow is provided between the return pipe and the connecting pipe. Is provided with a bypass pipe and a valve device for opening and closing the flow path of the bypass pipe, and a direction switching valve for switching the flow of the refrigerant in the forward and reverse directions is provided at a portion of the compressor where the refrigerant flows in and out, and a fluid to be cooled is supplied. When heating, the valve device is opened to allow the fluid to flow through the bypass pipe, and the directional switching valve is switched to allow the refrigerant of the compression refrigeration cycle to flow in the opposite direction to that during cooling. A cooling device characterized in that it works as a condenser to heat a fluid.