KR102004939B1 - Energy Saving System of HVAC heat source Equipment and its Control Using Water of a water cooled type chilled and coolant of a cooling tower as a refrigerant - Google Patents

Abstract

The present invention relates to an energy saving type thermo-hydrostat system for an air conditioning cooling heat source combining cold water of a water cooling refrigerator and cold water of a cooling tower, capable of always realizing a constant cooling capability, and a control method thereof. According to the present invention, the energy saving type thermo-hydrostat system for an air conditioning cooling heat source comprises: a thermo-hydrostat unit; the water cooling refrigerator; the cooling tower; a cold water circulation pipe including a cold water return line and a cold water supply line; a cooling water circulation pipe including a cooling water return line and a cooling water supply line; a first bypass pipe connecting the cold water return line with the cooling water return line; a second bypass line connecting the cold water return line with the cooling water return line; first valves controlling flow of the cold water circulated through the first bypass line; second valves controlling flow of cooling water circulated through the second bypass line; a first temperature sensor installed in the cold water supply line; a second temperature sensor installed in the cold water return line; a third temperature sensor installed in the cooling water supply line; and a controller.

Description

TECHNICAL FIELD The present invention relates to an air conditioning cooling heat source energy saving type constant temperature and humidity system combined with a water cooling type cold water cooling water and a cooling tower cooling water and a control method thereof refrigerant}

The present invention relates to a constant temperature and humidity system, and more particularly, to a constant temperature and humidity system comprising a cooling tower, a water-cooled refrigerator, and a constant temperature and humidity unit, wherein the cooling water produced by the cooling tower and the cold water produced by the water- The present invention relates to an energy saving type constant temperature and humidity system that is applied to a similar heating site including a data center as a free cooling cooling source using a cooling tower cooling water which is used to reduce energy required for cooling in a cooling space.

In general, the constant temperature and humidity system is used to maintain the cooling space at a constant temperature and humidity. It is composed of Internet Data Center (IDC), which has many electronic equipment sensitive to temperature and humidity, and temperature and humidity Is widely used in industrial fields which have a great influence on the quality of products.

On the other hand, in the case of the Internet data center, the unit area cooling load is rapidly increasing due to the development of information utilization technology, and accordingly, more energy is required to maintain the Internet data center at a constant temperature and humidity.

Fig. 1 shows the structure of a conventional constant temperature and humidity system.

The constant temperature and humidity system shown in FIG. 1 is installed at a place where the temperature and humidity of the room are required to be controlled. The load side device 10 performs the cooling through the heat exchange between the cold water and the room air. A cooling tower 20 that is used in the load side device 10 to cool and return cold water to the load side device 10 and cool the cold water to cool the cooling tower 20, And returning the refrigerant to the refrigerator (20).

Since the constant temperature and humidity system is the most general type and always performs the same cycle of cooling regardless of the external temperature, it always consumes a large amount of energy.

Considering these problems, various cooling systems have been developed to realize energy saving by using the outside air for cooling the cooling space when the temperature of the outside air is low. An example of this is disclosed in Patent Document 1.

The outdoor air cooling system provided with the cooling tower disclosed in Patent Document 1 operates in such a manner that the cold water used in the load side equipment is circulated by the refrigerator and cooled again in the summer when the outdoor air temperature is high. / In the winter, cold water used in the load side equipment is circulated to the cooling tower and cooled.

Such an outdoor air cooling system has an advantage that energy can be saved because the cold water is cooled using a cooling tower in a season when high cooling ability is not required.

However, since the temperature of the outside air changes greatly according to time and weather, there is a problem that it is difficult to realize a certain cooling capability in spring / winter / winter in which cold water is cooled using a cooling tower in the outdoor air cooling system of Patent Document 1.

Patent Registration No. 10-1255590 (issued on April 16, 2013)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a cooling system capable of always realizing a constant cooling capacity regardless of the temperature change of the outside air, Cooling (Free Cooling) An object of the present invention is to provide an air conditioning cooling heat source energy saving type constant temperature / constant humidity system and a control method thereof, which is a combination of a water cooling type refrigerator cold water and a cooling tower cooling water applicable to a similar heating place including a data center as a cooling heat source.

Another object of the present invention is to provide an air conditioning cooling heat source which is a combination of a cooling tower cooling water and a cooling tower cooling water to prevent the refrigerator from being damaged due to the subcooled cooling water flowing into the refrigerator due to the low temperature outside air. A constant temperature and humidity system and a control method thereof.

Another object of the present invention is to provide an air conditioning cooling heat source energy saving type constant temperature and humidity system that combines water cooling type cold water cooling water and cooling tower cooling water using a cooling tower cooling water that simplifies the structure of piping in which cooling water and cold water flow, .

According to an aspect of the present invention, there is provided a constant temperature and humidity unit for maintaining a cooling space at a constant temperature and humidity through heat exchange and humidification of air and cold water introduced into a cooling space. A water-cooled freezer for receiving cold water used in the constant temperature and humidity unit, and then supplying the cooled water to the constant temperature and humidity unit; A cooling tower for receiving the cooling water used for cooling the condenser in the water-cooled type refrigerator, cooling the same, and then supplying the cooled water to the water-cooling type refrigerator; A cold water circulation pipe passing the cold water circulating pipe through the constant temperature and humidity unit and the water cooling type refrigerator and including a cold water return line for flowing cold water from the constant temperature and humidity unit to a water cooled refrigerator and a cold water supply line for flowing cold water from the water cooled type refrigerator to the constant temperature and humidity unit; A cooling water circulation pipe connected to the water cooling type refrigerator and the cooling tower and including a cooling water return line for flowing cooling water from the water cooling type refrigerator to the cooling tower and a cooling water supply line for flowing cooling water from the cooling tower to the water cooling type refrigerator; A first bypass pipe connected to the cold water return line and the cooling water return line to flow all or a part of the cooling water returned to the water cooling type refrigerator to the cooling water return line; A second bypass pipe connected to the cold water return line and the cooling water supply line, for circulating all or a part of the cooling water supplied to the water-cooled refrigerator through the cold water return line to mix with the cold water; A first valve for controlling the flow of cold water flowing through the first bypass pipe; A second valve that controls the flow of the cooling water flowing through the second bypass pipe; A first temperature sensor installed in the cold water supply line and detecting the temperature of the cold water supplied to the constant temperature and humidity unit; A second temperature sensor installed in the cold water return line and detecting the temperature of the cold water returned to the water-cooled freezer; A third temperature sensor installed in the cooling water supply line for detecting the temperature of the cooling water supplied to the water-cooled refrigerator; And a function of comparing the temperature detected by the first temperature sensor with the temperature detected by the second temperature sensor and the third temperature sensor, and a function of bypassing the cold water to the cooling tower without operating the water- A function of supplying cold water and cooling water cooled by a water-cooling type refrigerator according to the result of comparison to a constant temperature and humidity unit And a controller having a function of supplying cooling water to the cooling tower cooling water cooling system. The freezing cooling water cooling system is a cooling water heat source using a cooling tower cooling water, Cooling heat source An energy-saving constant temperature and humidity system is provided.

In the air conditioning cooling heat source energy saving type constant temperature and humidity system in which the cooling water of the cooling water return line is connected to the cooling water supply line and the cooling water return line, ; A condensation pressure sensor installed in the water-cooled refrigerator to detect a condensation pressure of the refrigerant; And a third valve for controlling the flow of the cooling water flowing through the return line, wherein the controller compares the pressure value detected by the condensation pressure sensor with a preset reference value to determine whether the condensation value is lower than the reference value A function of increasing the temperature of the supplied cooling water by mixing the relatively high temperature return cooling water with the relatively low temperature supply cooling water through the opening of the return line.

In the air conditioning cooling heat source energy saving type constant temperature and humidity system in which water cooling type cold water cooling water and cooling tower cooling water are combined, cooling water supplied to the cold water returning line through the second bypass piping is passed through a water cooling type refrigerator together with cold water, To the constant temperature and humidity unit.

The present invention further includes a step (S10) of determining whether the cooling water supply temperature is lower than or equal to the cold water supply temperature; If it is determined in step S10 that the cooling water supply temperature is lower than or equal to the cold water supply temperature, the operation of the water-cooled refrigerator is stopped, the cold water returned to the water-cooling type refrigerator is bypassed to the cooling tower, (S20); (S30) if the cold water supply temperature is higher than the cold water supply temperature, and if the cold water supply temperature is higher than the coolant supply temperature and the coolant supply temperature is higher than the cold water supply temperature (S30); If it is determined in step S30 that the cold water return temperature is higher than the cooling water supply temperature and the cooling water supply temperature is higher than the cold water supply temperature, the cold water cooled by the operation of the water-cooling type refrigerator is mixed with the cooling water supplied through the second bypass pipe A step (S40) of supplying the mixture to a constant temperature and humidity unit; (S50), if it is determined that the cold water return temperature is not higher than the cooling water supply temperature or the cooling water supply temperature is not higher than the cold water supply temperature, the cold water cooled by the operation of the water- The present invention provides a control method of an energy saving type constant temperature / constant humidity system applied to a similar heat generation place including a data center as a free cooling cooling heat source using a cooling tower cooling water.

In the control method of the air conditioning cooling heat source energy saving type constant temperature and humidity control system in which the cooling water of the cooling water is combined with the cooling water of the cooling water of the cooling water, And to adjust the flow rate of the cold water bypassed to the cooling tower through the first bypass pipe in proportion to the temperature difference of the temperature.

In the control method of the air conditioning cooling heat source energy saving type constant temperature and humidity control system in which the cooling water of the water cooling type refrigerator is combined with the cooling tower cooling water, a step of determining whether the condensation pressure detected from the condensation pressure sensor provided in the water- (S61); If it is determined in step S61 that the condensation pressure is higher than the predetermined value, the second pump is operated, the third valve type is controlled so that the return line connecting the cooling water supply line and the cooling water return line is opened, (S61) so that the cooling water returned to the cooling water supply line is supplied to the cooling water supply line.

(S21) of determining whether the cooling water supply temperature is lower than the cold water supply temperature during the execution of the step S20 in the control method of the air conditioning cooling heat source energy saving type constant temperature and humidity system combining the water-cooling type cold water and the cooling tower cooling water. If it is determined in step S21 that the cooling water supply temperature is lower than the cold water supply temperature, the operation of the second pump for circulating the cooling water to the water-cooled freezer is stopped, the cooling fan provided in the cooling tower is operated, Step S22; And repeating the process from step S102 if the cooling water supply temperature is not lower than the cold water supply temperature as a result of the determination in step S21.

According to the present invention, the cooling water supplied from the cooling tower to the water-cooled refrigerator and the water returned from the water-cooled freezer or the temperature of the cold water supplied from the water-cooled freezer can be used to cool the cold water The entire or part of the cold water is bypassed to the cooling tower to lower the temperature of the cold water, thereby reducing the energy required for cooling the cold water.

Particularly, it is possible to control the amount of cold water to be bypassed in accordance with the temperature change of the cooling water according to the temperature change of the outside air, and to realize a constant cooling ability regardless of the weather change through operation of the appropriate water-

In addition, when the condensation pressure of the water-cooled type refrigerator increases to a set value or more as the low-temperature cooling water flows into the water-cooled type refrigerator, the temperature of the cooling water flowing into the water-cooled type refrigerator through the self- It is possible to maintain the condensation pressure of the water-cooling type refrigerator at a predetermined level regardless of the temperature of the water-cooling type refrigerator. Thus, energy consumption can be reduced by stably maintaining the environment optimized for the operation of the water-cooling type refrigerator.

In addition, the cooling water bypassed through the second bypass pipe is supplied to the cold water supply line and supplied to the constant temperature and humidity unit via the water-cooled refrigerator together with the cold water, thereby simplifying the piping around the water-cooled freezer.

Further, since the cooling water is directly supplied to the constant temperature and humidity unit, no separate heat exchanger is required between the cooling tower and the temperature and humidity unit, and there is no friction loss in the tube of the heat exchanger, And there is no temperature difference between the primary side and the secondary side of the heat exchanger, thereby maximizing the cooling efficiency by the cooling water.

1 is a structural view of a conventional constant temperature /
2 is a structural view of a constant temperature and humidity system according to a preferred embodiment of the present invention,
3 is a flow chart of a method of controlling a constant temperature and humidity system according to the present invention,
4 is a view showing an operation state of the winter season of the constant temperature and humidity system according to the present invention,
FIG. 5 is a view showing an operation state of a circulation period of a constant temperature and humidity system according to the present invention,
FIG. 6 is an exemplary view showing a summer operation state of the constant temperature and humidity system according to the present invention. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a structural view of a constant temperature and humidity system according to a preferred embodiment of the present invention.

The constant temperature and humidity system according to the present invention includes a constant temperature and humidity unit 110, a water-cooled freezer 120, a cooling tower 130, a cold water circulation pipe 140, a cooling water circulation pipe 150, a first bypass pipe 160, The second bypass line 170, the first valve 180, the second valve 190, the first temperature sensor 200, the second temperature sensor 210, the third temperature sensor 220, (230).

The constant temperature and humidity unit 110 maintains the temperature and humidity of the cooling space at a predetermined level through heating, cooling and humidification of the air flowing into the cooling space S, , A heating coil, a humidifier, a blower, a filter, and the like.

Meanwhile, the constant temperature and humidity system according to the present invention is optimized for an Internet data center in which a constant high heat is maintained irrespective of the seasons. The constant temperature and humidity unit 110 can be installed to process air flowing into an Internet data center have.

In addition, the air flowing into the Internet data center is ventilated by being discharged from the Internet data sensor and then flowed back to the Internet data center via the constant temperature and humidity unit 110. In this way, indirect cooling is performed by outside air, And has a feature of preventing contamination due to introduction of outside air.

The water-cooled refrigerator 120 is supplied with cold water used for cooling the air in the constant temperature and humidity unit 110 and then supplied to the constant temperature and humidity unit 110. The water-cooled refrigerator 120 includes a compressor, a condenser, an expansion valve and an evaporator And a known refrigerator including a refrigeration cycle.

Meanwhile, the water-cooled refrigerator 120 according to the present invention is configured to use cooling water for condensing the refrigerant in the condenser.

The cooling tower 130 receives the cooling water used for cooling the condenser in the water-cooling type refrigerator 120 and supplies the cooling water to the water-cooling type refrigerator 120. The cooling tower 130 may include a water injection pump and a cooling fan. have.

The cold water circulation pipe 140 is a pipe through which the cold water is circulated through the constant temperature and humidity unit 110 and the water cooled refrigerator 120. The cold water used in the constant temperature and humidity unit 110 flows into the water cooled refrigerator 120 And a cold water supply line 142 for flowing the cold water cooled in the water-cooled freezer 120 to the constant temperature and humidity unit 110.

On the other hand, the cold water supply line 142 is provided with a first pump 241 for circulating cold water.

The cooling water circulation pipe 150 is a pipe through which the cooling water is circulated through the water-cooling type refrigerator 120 and the cooling tower 130. The cooling water used for condensing the refrigerant in the water-cooling type refrigerator 120 is supplied to the cooling tower 130 And a cooling water supply line 152 for allowing the cooling water cooled by the cooling tower 130 to flow to the water-cooled freezer 120. The cooling water supply line 152 is connected to the water-

The cooling water supply line 152 is provided with a second pump 242 for allowing the cooling water to flow to the water cooling type refrigerator 120, The third pump 243 is installed at a position close to the cooling water inflow head of the water-cooling type refrigerator 120.

The first bypass pipe 160 is connected to the cold water return line 141 and the cooling water return line 151 so that all or part of the cooling water returned to the water cooling type refrigerator 120 flows to the cooling water return line 151 .

The second bypass pipe 170 connects the cold water return line 141 and the cooling water supply line 152 so that all or a part of the cooling water supplied to the water cooling type refrigerator 120 flows to the cold water return line 141 And mixed with cold water.

On the other hand, the cooling water supplied to the cold water return line 141 through the second bypass piping 170 passes through the water-cooled freezer 120 together with the cold water through the cold water circulation pipe 140 and then flows through the cold water supply line 142 And is supplied to the constant temperature and humidity unit 110. The pipe around the water-cooled refrigerator 120 can be simplified by constituting the piping through the water-cooled refrigerator 120 while the bypassed cooling water is mixed with the cold water .

The first valve 180 controls the flow of the cold water flowing through the first bypass pipe 160 and is connected to the first bypass pipe 160 and the cold water return line 141 at the connection point between the first bypass pipe 160 and the cold water return line 141. The valve can be configured as a valve.

The three-way valve constituting the first valve series 180 controls the opening of the discharge port on the first bypass pipe 160 and the opening of the discharge port on the water-cooled freezer 120 in accordance with the control signal generated by the controller 230. [ Thereby controlling the flow rate of the cold water bypassed to the cooling tower 130 through the first bypass pipe 160.

The second valve series 190 controls the flow of the cooling water flowing through the second bypass line 170 and may include an automatic valve installed in the second bypass line 170.

The automatic valve constituting the second valve series 190 is configured to open and close the flow path of the second bypass pipe 170 according to a signal generated by the controller 230. When the automatic valve is opened, And is supplied to the cold water return line 141 through the path piping 170.

The first temperature sensor 200 detects the temperature of the cold water supplied to the constant temperature and humidity unit 110 and may include a temperature sensor for detecting the temperature of the cold water supplied to the cold water supply line 142 have.

The second temperature sensor 210 may detect the temperature of the cold water returned to the water-cooled refrigerator 120 and may include a temperature sensor for detecting the temperature of the cold water returned to the cold water return line 141 .

The third temperature sensor 220 may detect the temperature of the cooling water supplied to the water-cooled refrigerator 120 and may include a temperature sensor for detecting the temperature of the cooling water supplied to the cooling water supply line 152 .

The controller 230 has a function of controlling the temperature and humidity control system to compare the temperatures detected by the first temperature sensor 200 with the second temperature sensor 210 and the third temperature sensor 220, The function of bypassing the cold water to the cooling tower 130 without cooling the water-cooled refrigerator 120 and cooling it, and then supplying the cooled water to the constant temperature and humidity unit 110; and a function of activating the water-cooled refrigerator 120 according to the comparison result, And a function of supplying cold water and cooling water cooled by the water-cooling type refrigerator 120 to the constant temperature and humidity unit 110 according to the result of the comparison, .

The controller 230 compares the temperatures detected by the first temperature sensor 200, the second temperature sensor 210, and the third temperature sensor 220 according to a predetermined order, and controls the temperature of the water-cooled refrigerator 120 A built-in program for controlling the first and second pumps 241 and 242, the first and second valves 180 and 190, the cooling tower 130, and the constant temperature and humidity unit 110, .

The return line 251, the condensation pressure sensor 252, and the third valve 253, which enable the condensation of the refrigerant in the condenser of the water-cooled refrigerator 120 to be performed under a constant pressure, May be further included.

The return line 251 is a pipe installed to connect the cooling water supply line 152 and the cooling water return line 151. Part of the cooling water returned to the cooling tower 130 through the cooling water return line 151 is returned to the return line 251 to the cooling water supply line 152. [

On the other hand, when the cooling water returned to the cooling tower 130 through the cooling water return line 151 is supplied to the cooling water supply line 152 through the return line 251, the relatively high temperature return cooling water is supplied at a relatively low temperature The temperature of the supplied cooling water can be increased. Accordingly, the temperature of the cooling water supplied to the water-cooled refrigerator 120 can be adjusted to a certain level through proper opening of the return line 251.

The condensation pressure sensor 252 is installed in the water-cooled refrigerator 120 to detect the condensation pressure of the refrigerant.

The third valve 253 controls the flow of the cooling water flowing through the return line 251 and may be a three-way valve provided at a connection point between the cooling water return line 151 and the return line 251. have.

The three-way valve constituting the third valve 253 controls the opening of the return line 251 and the opening of the cooling tower 130 in accordance with the control signal generated by the controller 230, And is configured to regulate the flow rate of the cooling water supplied to the cooling water supply line 152 through the line 251.

If the return line 251, the condensation pressure sensor 252 and the third valve 253 are further included, the controller 230 outputs a pressure value detected by the condensation pressure sensor 252 in advance, A function of increasing the temperature of the supply cooling water by mixing the relatively high temperature return cooling water with the relatively low temperature supply cooling water through the opening of the return line 251 when the condensation value is lower than the reference value by comparing the set reference value .

FIG. 3 is a flowchart illustrating a control method for a constant temperature and humidity system according to the present invention. FIG. 4 is a view illustrating an operation state of a constant temperature and humidity system according to the present invention, FIG. 6 is a view illustrating an example of the operation of the constant temperature and humidity system according to the present invention during the summer season.

The control method of the constant temperature and humidity system according to the present invention, which is implemented by the thermo-hygrostat as described above, includes the steps of: (S10) determining whether the cooling water supply temperature is lower than or equal to the cold water supply temperature; When the cooling water supply temperature is lower than or equal to the cold water supply temperature, the operation of the water-cooling type refrigerator 120 is stopped and the cold water returned to the water-cooling type refrigerator 120 is bypassed to the cooling tower 130 (S20) of supplying it to the constant temperature and humidity unit (110); (S30) if the cold water supply temperature is higher than the cold water supply temperature, and if the cold water supply temperature is higher than the coolant supply temperature and the coolant supply temperature is higher than the cold water supply temperature (S30); If it is determined in step S30 that the cold water return temperature is higher than the cooling water supply temperature and the cooling water supply temperature is higher than the cold water supply temperature, the cold water cooled by the operation of the water-cooling type refrigerator 120 and the second bypass pipe 170 (S40) mixing the supplied cooling water to the constant temperature and humidity unit (110); If the cold water return temperature is not higher than the cooling water supply temperature or the cooling water supply temperature is not higher than the cold water supply temperature, the cold water cooled by the operation of the water-cooling type refrigerator 120 is returned to the constant temperature and humidity unit 110 (S50). ≪ / RTI >

In step S10, the controller 230 receives and compares the temperature of the cooling water detected by the third temperature sensor 220 with the temperature of the cold water detected by the first temperature sensor 200. When the controller 230 determines that the cooling water supply temperature is lower than the cold water supply temperature Is determined to be low or equal.

On the other hand, prior to step S10, the cold water supply temperature is set, and the first, second, third pump and cooling tower are operated.

If the cooling water supply temperature is lower than or equal to the cold water supply temperature, the operation of the water-cooling type refrigerator 120 is stopped and the cold water returned to the water-cooling type refrigerator 120 is supplied to the cooling tower 130 And then supplied to the constant temperature and humidity unit (110).

That is, the step S20 is performed when the temperature of the cooling water is lower than the cold water supply temperature due to the low temperature of the outside air, such as during the winter season, and the cooling process is performed using freezing cooling water with a relatively low temperature .

At this time, the controller 230 stops the operation of the water-cooled refrigerator 120 and opens the flow path of the first bypass pipe 160 and the second bypass pipe 170, 180 and the second valve type 190 and controls the cooling tower 130 to operate.

Therefore, the cold water returned to the water-cooled freezer 120 through the cold water return line 141 flows into the cooling water return line 151 through the first bypass pipe 160 and is mixed with the cooling water, 130 and cooled by the outside air.

The cold water cooled together with the cooled cooling water is discharged from the cooling tower 130 through the cooling water supply line 152. A part of the cold water flowing through the cooling water supply line 152 is supplied to the water- Cooled refrigerator (120) through an opened second bypass pipe (170) and supplied to the cold water return line (141).

The cold water supplied to the cold water return line 141 passes through the water-cooled freezer 120 together with the refrigerant returned from the constant temperature and humidity unit 110 and then supplied to the constant temperature and humidity unit 110 through the cold water supply line 142 do.

As described above, since the cold water is cooled by bypassing the cold water to the cooling tower 130 without operating the water-cooled refrigerator 120 during the season or when the cooling water supply temperature is lower than the cold water supply temperature, the energy required for cooling the cold water . ≪ / RTI >

On the other hand, the amount of cold water bypassed to the cooling tower 130 increases or decreases in proportion to the difference between the cooling water supply temperature and the cold water supply temperature, which is controlled by the first valve 180 by the controller 230 .

For example, the controller 230 bypasses all or a part of the cold water by adjusting the opening degree of the first bypass pipe 160 in proportion to the difference between the cooling water supply temperature and the cold water supply temperature.

In the step S20, it is determined whether the cooling water supply temperature is lower than the cold water supply temperature (S21). If it is determined in step S21 that the cooling water supply temperature is lower than the cold water supply temperature, the operation of the second pump 242 for circulating the cooling water to the water-cooling type refrigerator 120 is stopped and the cooling fan provided in the cooling tower 130 is stopped (S22) repeating the operation from the operation S10; And repeating (S103) if the cooling water supply temperature is not lower than the cold water supply temperature as a result of the determination in the step S21.

When the operation of the second pump 242 is stopped through the step S22, both the cooling water and the cold water flowing through the cooling water supply line 152 pass through the second bypass pipe 170 to the cold water return line 141 ).

If it is determined in step S30 that the coolant supply temperature is not equal to or higher than the cold water supply temperature, that is, the coolant supply temperature is higher than the cold water supply temperature, the cold water return temperature detected by the second temperature sensor 210 is lower than the third temperature sensor 220, and determines whether the cooling water supply temperature is higher than a cold water supply temperature detected by the first temperature sensor 200. [0033] FIG.

If it is determined in step S30 that the cold water return temperature is higher than the cooling water supply temperature and the cooling water supply temperature is higher than the cold water supply temperature, the cold water cooled by the operation of the water- 170 and the cooling water supplied to the constant temperature and humidity unit 110 are mixed with each other.

That is, step S40 is a mode in which the temperature of the outside air is not sufficiently low and the temperature of the outside air is not sufficiently low and the temperature change width is large, and the preheating operation using the cooling water and the refrigerant evaporation heat of the water- .

The controller 230 operates the water-cooling type refrigerator 120 and the cooling tower 130 so that the flow of the first bypass pipe 160 and the second bypass pipe 170 is opened One valve 180 and the second valve 190 are controlled.

Meanwhile, the controller 230 increases or decreases the amount of cold water bypassed through the first bypass pipe 160 in proportion to the difference between the cooling water supply temperature and the cold water return temperature.

That is, the controller 230 adjusts the opening of the first bypass pipe 160-side flow path by controlling the first valve flow 180 according to the temperature difference between the cooling water supply temperature and the cold water return temperature, 1 bypass pipe 160 to the cooling tower 130 and the remaining cold water is cooled through the water-cooled freezer 120. [

In step S40, the cold water is cooled using both the cooling water and the water-cooled freezer 120. By controlling the amount of cold water to be bypassed in response to the temperature change of the cooling water according to the temperature change of the outside air, It is possible to supply the constant temperature cold water to the constant temperature and humidity unit 110 and to save energy for cooling the cold water.

If the cold water return temperature is not higher than the cooling water supply temperature or the cooling water supply temperature is not higher than the cold water supply temperature, the cold water cooled by the operation of the water-cooling type refrigerator 120 is supplied to the constant temperature and humidity unit 110 .

That is, in step S50, the cold water is cooled using the evaporation heat of the refrigerant, which is performed in the summer when the temperature of the outside air is high and the cooling of the cold water using the cooling water is not suitable.

The controller 230 operates the water cooling type refrigerator 120 and the cooling tower 130 so that the flow path between the first bypass pipe 160 and the second bypass pipe 170 is blocked One valve 180 and the second valve 190 are controlled.

The cold water is circulated through the cold water circulation pipe 140 to circulate through the thermo-hygrostat unit 110 and the water-cooled refrigerator 120. The cooling water circulates through the cooling water circulation pipe 150 to the cooling tower 130, And the refrigerant is circulated while being circulated through the refrigerant pipe 120.

In the control method of the energy-saving type constant temperature / constant humidity system, the condensing process of the refrigerant in the condenser of the water-cooled refrigerator 120 may be controlled under a predetermined condition.
That is, it is determined whether the condensation pressure detected by the condensation pressure sensor 252 provided in the water-cooled refrigerator 120 is higher than a previously set value (S61). If the condensation pressure is higher than the preset value The second pump 242 is operated to control the third valve 253 so that the return line 251 connecting the cooling water supply line 152 and the cooling water return line 151 is opened and the cooling water return line 151 (S61) that the cooling water returned to the cooling tower 130 through the cooling water supply line 152 is supplied to the cooling water supply line 152. [

In step S61, the controller 230 determines whether the condensation pressure detected by the condensation pressure sensor 252 is higher than a preset value input by the manager.

The cooling water supply line 152 is provided with a part of the relatively high temperature water returned from the water-cooling type refrigerator 120, As the temperature of the cooling water supplied to the water-cooled freezer 120 increases by the return cooling water supplied to the cooling water supply line 152, the condensation pressure of the condenser can be lowered.

Therefore, when the temperature drops sharply, such as during the winter season or during the season of change, it is possible to prevent the water-cooled refrigerator 120 from being damaged due to the subcooled cooling water flowing into the condenser.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
110: constant temperature and humidity unit 120: water-cooled freezer
130: Cooling tower 140: Cold water circulation piping
141: cold water return line 142: cold water supply line
150: Cooling water circulation pipe 151: Cooling water return line
152: cooling water supply line 160: first bypass pipe
170: second bypass piping 180: first valve flow
190: second valve type 200: first temperature sensor
210: second temperature sensor 220: third temperature sensor
230: controller 251: return line
252: condensation pressure sensor 253: third valve flow

Claims (7)

A constant temperature and humidity unit (110) for maintaining a cooling space at a constant temperature and humidity through heat exchange and humidification of air flowing into a cooling space and cold water;
A water-cooled refrigerator 120 provided with the cold water used in the constant temperature and humidity unit 110 and cooling it, and then supplying the cooled water to the constant temperature and humidity unit 110;
A cooling tower 130 for receiving cooling water used for cooling the condenser in the water-cooling type refrigerator 120 and cooling it, and then supplying the cooling water to the water-cooling type refrigerator 120;
A cold water returning line 141 for passing cold water from the constant temperature and humidity unit 110 to the water cooled freezer 120 via the constant temperature and humidity unit 110 and the water cooled freezer 120, A cold water circulation pipe (140) comprising a cold water supply line (142) for flowing cold water to the unit (110);
A cooling water return line 151 for passing cooling water from the water-cooling type refrigerator 120 to the cooling tower 130 via the water-cooling type refrigerator 120 and the cooling tower 130, a cooling water return line 151 from the cooling tower 130 to the water- A cooling water circulation pipe (150) comprising a cooling water supply line (152) for flowing cooling water to the cooling water circulation pipe (150);
A first bypass pipe 160 installed to connect the cold water return line 141 and the cooling water return line 151 to flow all or a part of the cooling water returned to the water cooling type refrigerator 120 to the cooling water return line 151, ;
A second bypass which is installed to connect the cold water return line 141 and the cooling water supply line 152 and flows all or a part of the cooling water supplied to the water-cooled freezer 120 through the cold water return line 141, A piping 170;
A first valve (180) for controlling the flow of cold water flowing through the first bypass pipe (160);
A second valve (190) for controlling the flow of the cooling water flowing through the second bypass pipe (170);
A first temperature sensor (200) installed in the cold water supply line (142) for detecting the temperature of cold water supplied to the temperature and humidity unit (110);
A second temperature sensor 210 installed in the cold water return line 141 to detect the temperature of the cold water returned to the water-cooled freezer 120;
A third temperature sensor 220 installed in the cooling water supply line 152 for detecting the temperature of the cooling water supplied to the water-cooled refrigerator 120; And
A function of comparing the temperature detected by the first temperature sensor 200 with the temperature detected by the second temperature sensor 210 and the third temperature sensor 220 and a function of cooling the cold water without operating the water- And cooling the cold water to the constant temperature and humidity unit 110. The cooling water is supplied to the constant temperature and humidity unit 110 by cooling the cold water to the tower 130, And a controller (230) having a function of mixing cold water and cooling water cooled by the water-cooling type refrigerator (120) according to the result of the comparison and supplying the mixed water to the constant temperature and humidity unit (110) And Cooling Tower Cooling Water Cooling Heat Source Energy Saving Type Constant Temperature and Humidity System. The method according to claim 1,
A return line 251 installed to connect the cooling water supply line 152 and the cooling water return line 151 to flow the cooling water of the cooling water return line 151 to the cooling water supply line 152;
A condensation pressure sensor 252 installed in the water-cooled refrigerator 120 for detecting the condensation pressure of the refrigerant; And
And a third valve (253) for controlling the flow of cooling water flowing through the return line (251)
The controller 230 compares the pressure value detected by the condensation pressure sensor 252 with a preset reference value to determine whether the condensation value is lower than the reference value or not by returning the return line 251 to the return cooling water And cooling the water to be supplied to the cooling water to cool the cooling water to cool the cooling water to cool the supply cooling water. The method according to claim 1,
The cooling water supplied to the cold water return line 141 through the second bypass pipe 170 is supplied to the constant temperature and humidity unit 110 through the water cooled refrigerator 120 and the cold water supply line 142 together with the cold water The cooling / heating cooling / heating source energy saving type constant temperature / humidity system combined with the water cooling type cold water cold water and the cooling tower cooling water. A method of controlling an air-conditioning cooling heat source energy-saving type constant temperature / constant humidity system comprising a water-cooled refrigerator cold water and a cooling tower cooling water according to any one of claims 1 to 3,
Determining whether the cooling water supply temperature is lower than or equal to the cold water supply temperature (S10);
When the cooling water supply temperature is lower than or equal to the cold water supply temperature, the operation of the water-cooling type refrigerator 120 is stopped and the cold water returned to the water-cooling type refrigerator 120 is bypassed to the cooling tower 130 (S20) of supplying it to the constant temperature and humidity unit (110);
(S30) if the cold water supply temperature is higher than the cold water supply temperature, and if the cold water supply temperature is higher than the coolant supply temperature and the coolant supply temperature is higher than the cold water supply temperature (S30);
If it is determined in step S30 that the cold water return temperature is higher than the cooling water supply temperature and the cooling water supply temperature is higher than the cold water supply temperature, the cold water cooled by the operation of the water-cooling type refrigerator 120 and the second bypass pipe 170 (S40) mixing the supplied cooling water to the constant temperature and humidity unit (110); And
If it is determined in step S30 that the cold water return temperature is not higher than the cooling water supply temperature or the cooling water supply temperature is not higher than the cold water supply temperature, the cold water cooled by the operation of the water-cooling type refrigerator 120 is supplied to the constant temperature and humidity unit 110 (S50). The method of controlling an air-conditioning cooling heat source energy-saving type constant temperature / humidity system comprising a water-cooled refrigerator cold water and a cooling tower cooling water. The method of claim 4,
In step S20, the temperature difference between the cooling water supply temperature and the cold water supply temperature is increased. In step S40, the cold water is bypassed to the cooling tower 130 through the first bypass pipe 160 in proportion to the temperature difference between the cooling water supply temperature and the cold water return temperature. Wherein the flow rate of the cooling water is controlled by controlling the flow rate of the cooling water. The method of claim 4,
(S61) determining whether the condensation pressure detected by the condensation pressure sensor 252 provided in the water-cooled freezer 120 is higher than a previously set value;
The second pump 242 is operated and the return line 251 connecting the cooling water supply line 152 and the cooling water return line 151 is opened to open the third pump 242, And a step (S61) of controlling the valves (253) so that the cooling water returned to the cooling tower (130) through the cooling water return line (151) is supplied to the cooling water supply line (152) Control Method of Air - Cooled Heat Source Energy Saving Type Constant Temperature and Humidity System Combined with Cooler Cooling Water and Cooling Tower Cooling Water. The method of claim 4,
During the execution of step S20,
Determining whether the cooling water supply temperature is lower than the cold water supply temperature (S21);
If it is determined in step S21 that the cooling water supply temperature is lower than the cold water supply temperature, the operation of the second pump 242 for circulating the cooling water to the water-cooling type refrigerator 120 is stopped and the cooling fan provided in the cooling tower 130 is stopped (S22) repeating the operation from the operation S10; And repeating the step (S23) from the step S102 if the cooling water supply temperature is not lower than the cold water supply temperature as a result of the determination in the step S21. The water-cooling type refrigerator according to claim 1, Control method of economical constant temperature and humidity system.

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