JPH0828944A - Atmospheric latent heat recovery type air conditioner system - Google Patents

Abstract

PURPOSE:To obtain an atmospheric latent heat recovery type air conditioner system in which the latent heat of the atmosphere is recovered, and cooling is conducted in winter or intermediate season having low atmospheric temperature in the system which needs the cooling through the year. CONSTITUTION:An air conditioner system circulates cooling water via a cooling water line 8 between a refrigerator or a hot and chilled water generator 1 and a cooling tower 7 and circulates chilled water for cooling manufactured by the refrigerator or the generator 1 to a load side unit 17 via a chilled water line 15 to cool. Accordingly, an atmospheric latent heat recovery type air conditioner system connects cooling water supply bypass tube 21 between the cooling water return tube 4 of the line 8 and the chilled water supply tube 12 to the unit 17 via switching valves 18, 19, 20, and connects a cooling water return bypass tube 25 between the refrigerator or the generator 1 and a cooling water outlet tube 5 via switching valves 22, 23, 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for a building, and can be effectively applied to an air conditioning system in which a cooling operation is performed throughout the year including winter and intermediate periods, and by recovering latent heat of outside air. The present invention relates to an outside air latent heat recovery type air conditioning system capable of significantly saving energy.

[0002]

2. Description of the Related Art In an air conditioning system installed in a place where cooling is required throughout the year, a refrigerator or a chiller / hot water machine is operated to perform cooling even in a winter or an intermediate period. However, the outside air temperature may be lower than the room temperature during the winter and intermediate periods, and if it is possible to cool by using this low outside air temperature, there is a merit that leads to energy saving, so some individual air conditioning There are some machines that employ a so-called outside air cooling system, in which the compressor is stopped and the outside air is guided directly to the air conditioner to be blown out into the room for cooling.

[0003]

Although the outside air cooling system can be relatively easily adopted for an individual air conditioner, in the case of a large system such as a centralized air conditioning system, duct space, duct size, gully size, There is a problem that the space for installing an air conditioner, such as the installation space of the blower, becomes very large, which leads to a reduction in the effective use area ratio and the energy saving effect is halved due to the drive power of the blower. In addition, the system requires an air supply / exhaust duct, an air supply / exhaust fan, an automatic operation control device including a variable fan control device, and the like, which causes a large increase in equipment cost.

[0004]

In order to solve the above-mentioned problems, an outside air latent heat recovery type air conditioning system according to the present invention has at least a refrigerator or a chiller / heater capable of producing cold water for cooling and heat exchange with outside air. A cooling tower that cools the cooling water by
A cooling water system passage including a cooling water pipe and a cooling water circulation pump that circulates cooling water between the refrigerator or the cold / hot water machine and a cooling tower, a load side unit that uses the cooling water for cooling, and the refrigerator or the cold / hot water. In the air conditioning system including a cold water pipe for circulating the cooling water for cooling between the machine and the load side unit, and a cold water system passage including a cold water circulation pump, the cooling water return pipe of the cooling water system passage and the cold water to the load side unit Connect a cooling water supply bypass pipe to the supply pipe via a switching valve, and switch between the chilled water return pipe to the refrigerator or the chilled water heater and the cooling water outlet pipe from the chiller or chilled water heater. It is characterized in that a cooling water return bypass pipe is connected via a valve.

[0005]

The function of the outside air latent heat recovery type air conditioning system according to the present invention is as follows.
Since it is configured as described above, it is usually possible to operate the refrigerator or the hot / cold water machine and cool the produced cold water for cooling by supplying it to the load side unit via the cold water system passage, thereby cooling in the winter season. When the outside air temperature is lower than the room temperature and cooling can be performed by introducing the outside air in the middle period or in the middle period, stop the refrigerator or the hot / cold water machine and then switch the switching valve to switch the cooling water supply bypass pipe to the cooling water system passage. The cooling water return pipe and the cold water supply pipe to the load side unit are connected to each other, and the cooling water return bypass pipe is connected to the cooling water return pipe of the cooling water system line and the cooling water outlet pipe of the cooling water system line to connect the cooling tower. The cooling water cooled by heat exchange with the outside air can be directly supplied to the load side unit for cooling.

[0006]

DETAILED 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 an outside air latent heat recovery type air conditioning system according to an embodiment of the present invention. Various refrigerators or cold / hot water machines 1 that produce cold water for cooling have a water-cooled condenser 2 for radiating heat and an evaporator 3 for cooling the cold water. In the water-cooled condenser 2, cooling water is circulated between the cooling water return pipe 4, the cooling water outlet pipe 5, and the cooling water circulation pump 6 and a cooling tower 7 that cools the cooling water by heat exchange with the outside air. A water system passage 8 is connected, and a bypass pipe 9 and a three-way adjusting valve 10 are provided between the cooling water outlet pipe 5 and the cooling water return pipe 4 in order to adjust the cooling water temperature to a constant level. Has been. In addition, the cooling water return pipe 4 from the cooling tower 7
A filter 11 for filtering cooling water is installed therein.

On the other hand, on the side of the evaporator 3, cold water including a cold water supply pipe 12 for supplying the manufactured cold water for cooling to the load side, a cold water return pipe 13 from the load side, and a cold water circulation pump 14 for circulating the cold water for cooling. A system path 15 is connected to the cold water system path 15. A load side unit 17 such as a large number of induction units, air handling units and fan coil units is connected to the cold water system path 15 via a branch pipe 16.

Further, the cooling water supply bypass pipe 2 is provided between the cooling water return pipe 4 of the cooling water system passage 8 and the cooling water supply pipe 12 to the load side unit 17 via switching valves 18, 19, 20.
1 to connect the cold water return pipe 1 to the refrigerator or the hot and cold water machine 1.
3 and the cooling water outlet pipe 5 from the refrigerator or the hot / cold water machine 1, a cooling water return bypass pipe 25 is connected via switching valves 22, 23, 24, and the cold water circulation pump 14 in the cold water system passage 15 is connected. A cooling water bypass pipe 29 is connected in parallel via the switching valves 26, 27, 28.

Further, the outside air sensor 30 and the inside air sensor 31
The enthalpy difference between the outside air and the inside air is calculated from the temperature detected by, and the refrigerator or the cold / hot water machine 1 is operated for cooling, or the refrigerator or the cold / hot water machine 1 is stopped and the switching valve 1
8, 22, 26 open, switching valves 19, 20, 23, 24,
A controller 32 is provided which closes 27 and 28 and automatically switches whether cooling water cooled in the cooling tower 7 is directly supplied to the load side unit 17 to perform cooling by recovering latent heat from the outside air. The switching valves 18, 19, 20, 22, 2
Instead of 3, 24, 26, 27, 28, the cooling water supply bypass pipe 21, the cooling water return bypass pipe 25, and the cooling water bypass pipe 29 can be connected by providing a three-way switching valve at their connecting portions.

However, according to the above-described embodiment, during normal cooling operation in the summer or the middle season when the outside temperature is high, the refrigerator or the cold / hot water machine 1 is operated to produce cold water for cooling, and this cold water is used as a cold water system. Cooling is performed by circulating the heat to the load-side unit 17 via the path 15, and at this time, the heat released from the refrigerator or the hot / cold water machine 1 is transferred by the cooling water circulating in the cooling water path 8 to cool the cooling tower 7 The heat is radiated into the outside air by exchanging heat with the outside air.

On the other hand, when the outside air temperature decreases during the winter season or the middle season, the controller 32 calculates the enthalpy difference between the outside air and the inside air from the temperature detected by the outside air sensor 30 and the inside air sensor 31, and when the difference is equal to or more than the set value, the outside air latent heat When it is determined that cooling by recovery is possible, the switching valves 18, 22, 26 are opened,
The cooling water cooled by the heat exchange with the outside air in the cooling tower 7 while closing the switching valves 19, 20, 23, 24, 27, 28, stopping the refrigerator or the cold / hot water machine 1, and the cold water circulation pump 14. By directly circulating the air into the load side unit 17, it is possible to perform cooling by so-called outside air latent heat recovery.

In this case, the cooling water system path 8 and the cooling water system path 15 are communicated with each other, and the cooling water cooled by direct contact with the outside air in the cooling tower 7 is circulated to the load side unit 17 and the cooling is performed. Suspended substances in the air in water, organic matter, sand,
Soil, dust, etc. are mixed in, which causes clogging of the load side unit 17, the piping of the cold water system passage 15, etc., deterioration of heat exchange capacity, corrosion, etc., and therefore, in the cooling water return piping 4 from the cooling tower 7. Since the filter 11 is provided in the unit to filter the cooling water to remove the above substances and circulate them, it is possible to extend the life of the load side unit 17, the piping of the cold water system passage 15, and the like. it can.

Therefore, according to the above-described embodiment, when the outside air temperature is low in the winter season or the middle season, it can be effectively used to stop the refrigerator or the hot / cold water machine 1 to perform cooling, thus saving energy. Therefore, the running cost can be significantly reduced. In addition, since the cooling by the operation of the refrigerator or the hot / cold water machine 1 and the cooling by the recovery of the latent heat of the outside air are automatically switched, labor saving and the most efficient operation can be realized. Further, the filter 11, the cooling water supply bypass pipe 21, the cooling water return bypass pipe 2
5, cooling water bypass pipe 29, and switching valves 19 to 28
Since it is only necessary to newly install it, it is possible to realize cooling with outside air latent heat recovery with simple equipment and low investment cost because it does not require ducts or blowers, and it can be easily applied to existing air conditioning systems. it can.

Further, since the cooling water is filtered and circulated by installing the filter 11, clogging of the load side unit 17, the piping of the cold water system passage 15, etc., deterioration of heat exchange capacity, corrosion, etc. It is possible to eliminate the factors, extend the life of these factors, and perform stable operation for a long time.
By periodically injecting the scale dispersant from the cooling tower 7, scale failure, slime failure, metal corrosion, etc. in the cooling water system passage 8 and the cooling water system passage 15 can be more effectively prevented.

[0015]

As described above, according to the outside air latent heat recovery type air conditioning system according to the present invention, the operation of the refrigerator or the chiller / hot water machine 1 is stopped and the cooling is performed at the time of low outside air temperature such as in the winter or the middle period. Since the cooling water cooled by heat exchange with the outside air in the tower can be directly circulated to the load side unit and cooled by recovering the outside air latent heat, energy saving and running cost reduction can be achieved. At this time, since a filter is provided in the cooling water return pipe from the cooling tower to filter and circulate the cooling water, clogging of the load side unit, piping of the cold water system path, etc. Prevents deterioration, corrosion, etc., extends their lifespan, and enables stable operation for a long period of time, and the controller automatically switches between cooling by operating the refrigerator or hot / cold water machine and cooling by recovering latent heat from the outside air. Therefore, it is possible to improve efficiency and save labor.

[Brief description of drawings]

FIG. 1 is a system diagram of an outside air latent heat recovery type air conditioning system according to an embodiment of the present invention.

[Explanation of symbols]

1 Refrigerator or Cold / Hot Water Machine 4 Cooling Water Return Pipe 5 Cooling Water Outlet Pipe 6 Cooling Water Circulation Pump 7 Cooling Tower 8 Cooling Water System Channel 11 Filter 12 Cold Water Supply Pipe 13 Cold Water Returning Pipe 14 Cold Water Circulation Pump 15 Cold Water System Channel 17 Load Side Units 18, 19, 20, 22, 23, 24, 26, 27, 2
8 Switching Valve 21 Cooling Water Supply Bypass Pipe 25 Cooling Water Return Bypass Pipe 29 Cooling Water Bypass Pipe 32 Controller

Claims (4)

[Claims] 1. A refrigerator or a cold / hot water machine capable of producing at least cold water for cooling, a cooling tower for cooling the cooling water by heat exchange with the outside air, and the refrigerator or the cold / hot water machine and the cooling tower. A cooling water system passage including a cooling water pipe and a cooling water circulation pump for circulating the cooling water, a load side unit that uses the cooling water for cooling, and the cooling water for cooling between the refrigerator or the cooling / heating machine and the load side unit. In an air conditioning system provided with a cold water pipe and a cold water system passage including a cold water circulation pump, cooling water is supplied via a switching valve between the cooling water return pipe of the cooling water system passage and the cold water supply pipe to the load side unit. In addition to connecting a bypass pipe, a cooling water return bypass pipe is connected via a switching valve between the cold water return pipe to the refrigerator or the cold water heater and the cooling water outlet pipe from the refrigerator or the cold water heater. Characterized by Outside air latent heat recovery type air conditioning system that. 2. The outside air latent heat recovery type air conditioning system according to claim 1, wherein a filter is installed in a cooling water return pipe from the cooling tower. 3. The outside air latent heat recovery type air conditioner according to claim 1, wherein a cooling water bypass pipe is connected in parallel to the cold water circulation pump in the cold water system passage via a switching valve. system. 4. The enthalpy difference between the outside air and the inside air is calculated, and the refrigerator or the hot / cold water machine is operated for cooling, or the refrigerator or the cold / hot water machine is stopped and the cooling water cooled in the cooling tower is directly loaded. The outside air latent heat recovery type air conditioning system according to claim 1, further comprising a controller that automatically switches whether to cool the unit by supplying it to the unit to recover the outside air latent heat.