JP3195376B2 - Chilled water system control method in air conditioning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a nuclear facility or the like, and more particularly, to a method for controlling cooling water supplied to a cooler for heating internal equipment and a cooler for outside air.

[0002]

2. Description of the Related Art For example, in a nuclear facility or the like, in order to eliminate heat generated from equipment and the like, cooling is performed throughout the year by a cooler for internal heating, and ventilation is provided to a potentially contaminated area. The air is sent at a constant supply temperature.

FIG. 2 shows an example of a conventional chilled water system for air conditioning in a nuclear facility. The cold water cooled by the refrigerating machine group E is sent to the internal device heat generating cooler group F and the outside air cooler group G by the cold water outgoing pipelines 4 and 5, respectively. The internal equipment heat-generating cooler group F is basically for eliminating the heat generated from the installed equipment. Therefore, when the installed equipment is operated at a constant rate throughout the year, the air conditioning load is similarly increased year by year. , And the amount of water supplied to each of the internal device heat-generating coolers 1, 1,... Is also substantially constant throughout the year.

On the other hand, in the outdoor air cooler group G, air supply thermometers 8, 8,... Are installed for each outdoor air cooler 2, 2,.
In order to make the supply air temperature measured by the thermometers 8, 8,... The designed supply air temperature, the opening of the regulating valves 6, 6,. Are controlled by the water heaters 7, 7,.
The amount of water supplied to the island will fluctuate throughout the year.

Returning cold water from the internal equipment heat generating cooler group F and the external air cooler group G passes through the cold water return pipes 9 and 10 through the respective cold water pumps 11, 11. Circulated to ... As described above, the amount of water supplied to the internal equipment heat generating cooler group F is substantially constant throughout the year, but the amount of water supplied to the outdoor air cooler group G varies throughout the year. Fluctuate through. Therefore, the temperature of the return chilled water is measured by the return water thermometer 12 to grasp the load fluctuation of the chilled water, and the number of operating chillers 3 is controlled by the operating number controller 13 so that the operation of each of the refrigerators 3, 3,. , 3 ... are controlled.

[0006]

It is most desirable that the design air supply temperature (set value) in the above-described outdoor air coolers 2, 2,... Is set as an optimum temperature for maintaining the indoor environment. Because the load on the machines 3, 3,... Increases, the design supply air temperature (set value) is set to the supply air temperature that keeps the indoor environment at an acceptable minimum condition at the design outside air condition temperature (maximum temperature). ing. Therefore, although the outside air temperature is actually lower than the design outside air condition temperature for most of the period and the operation capacity of the refrigerators 3, 3,... It is not enough for indoor environment because it is the amount of water supply to make "temperature to keep the minimum condition".

If the outside air condition exceeds the designed outside air condition due to abnormal weather, the cooling capacity of the outside air coolers 2, 2,... Increases, and the load of the refrigerator increases. In addition, there is a problem that the operation of the entire cooling system is stopped and, at the same time, the operation of the devices becomes impossible because the heat generation of the devices cannot be eliminated.

Therefore, a main object of the present invention is to optimally control the indoor environment within the range of the refrigerating capacity of the refrigerator,
Even if the load exceeds the refrigerating capacity of the refrigerator,
An object of the present invention is to provide a method for controlling a chilled water system in an air conditioner, which prevents the entire cooling system from being stopped and at least cools the devices.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to provide a cooling unit for heating internal equipment to which a substantially constant amount of chilled water is supplied throughout the year, and that a water supply amount is variably controlled so that the supply air temperature becomes a target supply air temperature. Outside air cooler group, comprising a plurality of refrigerators installed to cool the water supply to the internal device heat generation cooler group and the outside air cooler group, the cold water from the refrigerator is parallel to supply the internal equipment heating cooling unit group to the outside air cooler group, in air conditioning which is adapted to circulate cold water again the refrigerator went back from the condenser: the outer
The inlet air temperature for each outdoor air cooler of air cooling unit group and controls the water amount so as to obtain the target supply air temperature, setting the optimal supply air temperature based on the target supply air temperature to the measured value of the outside air temperature Then, an optimal supply air temperature cascade control for individually controlling the amount of water supplied to each of the outside air coolers so as to obtain the optimal supply air temperature is performed , and the internal equipment heat generation cooler group and the outside air cooling control are performed .
The temperature of the return chilled water from each of the coolers in the heat exchanger group is measured, and when the temperature of the returned chilled water is equal to or higher than the design temperature, the amount of water supplied to each of the external air coolers is adjusted to the optimum supply amount. The problem can be solved by performing control that prioritizes the air temperature cascade control.

[0010]

According to the present invention, Oite water supply amount to the supply air temperature for each outdoor air cooler and the target supply air temperature to the air cooler water control for controlling individually the target supply air temperature of the outside air temperature The optimum supply air temperature is set based on the measured value, and the optimum supply air temperature cascade control for controlling the amount of water supplied to the outside air cooler so as to achieve the optimum supply air temperature is performed. Therefore, basically, within the capacity range of the refrigerator, the target air supply temperature is freely set to the optimum air supply temperature based on the measured value of the outside air temperature, so that the indoor environment can be maintained optimally.

When the outside air temperature rises above a certain value due to the freely set supply air temperature, the refrigerator is overloaded due to overload, and both the internal equipment heat generating cooler and the external air cooler are cooled. Insufficient ability. For this reason, the temperature of the returning cold water is sequentially measured and compared with a design temperature to detect an overload state. When the return chilled water temperature is equal to or higher than the design temperature (overload state)
When it becomes, by controlling the amount of chilled water to be supplied to each of the outside air coolers so as to be throttled in preference to the optimal supply air temperature cascade control, while sacrifice cooling on the outside air cooler side. At least, cooling is ensured on the side of the internal device heat generating cooler, and control is performed so as not to cause an overload state. Such chilled water system control can suppress overload of the refrigerator and prevent the entire operation of the cooling system from being stopped due to the overload of the refrigerator.

Further, since the amount of cold water supplied to the outside air cooler varies throughout the year, the required capacity of the refrigerator also varies.
In the past, the number of chillers operated was measured by measuring the return chilled water temperature, but this management system automatically increases the amount of chilled water to the outside air cooler when the outside air temperature rises. However, if the number of operating chilled water pumps is the same, the amount of chilled water to the internal equipment heat-generating cooler will decrease, and cooling to internal heat generation will be insufficient, and the load on the refrigerator (return chilled water temperature) and the amount of chilled water Did not always link.

Therefore, in the present invention, when the amount of chilled water required in the cooler group exceeds the supply amount of the refrigerator, the water pressure difference between the forward side and the return side of the refrigerator group is reduced below the design condition. And the number of operating chillers is controlled based on the water pressure change on the outward and return sides of the chiller, so that the amount of chilled water to the internal equipment heat-generating cooler can be ensured.

By using the conventional control system of the number of operating refrigerators based on the measurement of return chilled water temperature and the control system of the number of operating refrigerators based on the water pressure difference according to the present invention, a more reliable control system can be realized. can do.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in FIG. In FIG. 1, the chilled water from the refrigerator group E is supplied to the internal equipment heat-generating coolers F by the cold water outgoing lines 4 and 5, respectively.
And returned to the cooler group G for outside air, and return cold water from the cooler groups F and G passes through the cold water return lines 9 and 10 through the respective cold water pumps 11 and 11. …
Has been circulated.

Since the internal equipment heat-generating cooler group F is basically for removing the heat generated from the installed equipment, when the installed equipment is operated constantly throughout the year,
Similarly, the air conditioning load is constant throughout the year, and the amount of water supplied to each of the internal device heat-generating coolers 1, 1,... Is also substantially constant throughout the year.

On the other hand, in the outdoor air cooler group G, supply air thermometers 8, 8,... Are installed for each outdoor air cooler 2, 2,.
In order to make the supply air temperature measured by the thermometers 8, 8,... The target supply air temperature, the opening of the regulating valves 6, 6,. Are controlled by the heaters 7, 7,...

In this embodiment, in order to optimize the indoor environment within the capacity of the refrigerators 3, 3,..., An outside air thermometer 17 for measuring the outside air temperature is provided, and the measured temperature is adjusted. ..., and connected to outside air coolers 2, 2,.
The cascade control for setting the optimum supply air temperature so that the room temperature becomes optimum based on the outside air temperature is performed.

As described above, since the target supply air temperature is freely set according to the outside air temperature, when the outside air condition becomes higher than the design outside air condition, the outside air coolers 2, 2,... Cooling capacity exceeds the design value, and the load on the refrigerator increases, resulting in overloading. For this reason, in the present invention, the temperature of the return chilled water is measured by the return water thermometer 12, and the load fluctuation of the chilled water is sequentially grasped. Cooler 2, 2
Are narrowed down in priority to the control of the regulators 7, 7,... (Control to set the optimum supply air temperature in accordance with the outside air temperature).

Further, the amount of water supplied to the internal equipment heat generating cooler group F is substantially constant throughout the year, but the amount of water supplied to the external air cooler group G is set to be equal to the external air coolers 2, 2,. Are reduced, the number of operating refrigerators 3, 3,... Is reduced, the overall load capacity can be reduced, and the total water supply varies throughout the year.

Therefore, the temperature of the return chilled water is measured by the return water thermometer 12 so as to prevent the operation of each of the refrigerators 3, 3,... A control system for controlling the number of operating chillers 3, 3,... Is provided, and piping on the outgoing and returning sides of the chillers 3, 3,. the water pressure of 21 and 20 were measured by the pressure difference detector 14, the two control system and a control system for controlling the refrigerator 3,3 ... number of operating by the operation number controller 15 based on the difference pressure change , The operating number of the refrigerators 3, 3,... Is changed when one of the control systems operates.

[0022]

As described above, according to the present invention, the indoor environment can be optimally controlled within the range of the cooling capacity of the refrigerator, and when the load exceeding the cooling capacity of the refrigerator is applied. However, stoppage of the entire cooling system can be prevented, and at least cooling of the equipment can be ensured.

[Brief description of the drawings]

FIG. 1 is an overall flowchart of an air-conditioning chilled water system according to the present invention.

FIG. 2 is an overall flowchart of a conventional chilled water system for air conditioning.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cooler for heat generation of internal equipment, 2 ... Cooler for outside air, 3 ... Refrigerator, 4/5 ... Cold water outgoing line, 6 ... Regulator, 7 ... Regulator
8: supply air thermometer, 9/10: cold water return line, 11: cold water pump, 12: return water thermometer, 17: outside air thermometer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-106343 (JP, A) JP-A-49-82160 (JP, A) JP-A-2-61454 (JP, A) JP-A 55-106 56553 (JP, A) JP-A-64-19263 (JP, A) JP-A-61-59142 (JP, A) JP-A-2-192539 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) F24F 5/00 F24F 11/02 F25B 1/00

Claims (2)

(57) [Claims] 1. A group of heat generating coolers for internal equipment to which a substantially constant amount of cold water is supplied throughout the year, and a group of external air coolers for controlling the amount of water supplied to change the supply air temperature to a target air supply temperature. It comprises a plurality of refrigerators installed to cool the water supply to the internal equipment heat generation cooler group and the outside air cooler group, and the internal equipment heat generation cooler group to cool water from the refrigerator. In an air-conditioning system that supplies the outside air coolers in parallel to each other and circulates the return cold water from each cooler again to the refrigerator: supply of each outside air cooler of the outside air coolers In addition to controlling the water supply amount so that the air temperature becomes the target air supply temperature, the target air supply temperature is set to the optimum air supply temperature based on the measured value of the outdoor air temperature, and each of the air supply air is set to the optimum air supply temperature. the optimal supply air temperature slag individually controlling the water amount to use cooler Performed over de control, the measured temperature of the cold water went back from the internal device heating cooling unit group and the cooler ambient air cooler group, if this went back chilled water temperature is equal to or higher than the design temperature, the respective A method for controlling a chilled water system in an air conditioner, wherein a control is performed to narrow down an amount of water supplied to a cooler for outside air in preference to the optimal supply air temperature cascade control. 2. The chilled water system control method in an air conditioner according to claim 1, wherein the water pressure on the outward side and the return side of the group of chillers is measured, and the number of chillers operated is controlled based on a change in the differential pressure between the water pressures. .