Air-conditioning system

Abstract

An air-conditioning system includes an air conditioner, a heat source device, and a controller. In a case where an indoor temperature is a setting value, the controller performs a first adjustment operation including: transmitting a switching signal to the heat source device to instruct the heat source device to switch a setting water temperature to a first setting water temperature; and adjusting a temperature difference of heat-exchange water to a target water temperature difference. In a case where the indoor temperature is not the setting value, the controller performs a second adjustment operation including: transmitting a switching signal to the heat source device to instruct the heat source device to switch the setting water temperature to a second setting water temperature; and adjusting an air supply temperature of air-conditioning air to a setting air supply temperature.

What is claimed is: 
     
         1 . An air-conditioning system comprising:
 an air conditioner configured to adjust an air supply temperature of air-conditioning air by using heat-exchange water, and supply the air-conditioning air to indoors;   a heat source device configured to adjust a temperature of the heat-exchange water, and selectively switch a setting water temperature of the heat-exchange water, to which the temperature of the heat-exchange water is to be adjusted, between a first setting water temperature preset corresponding to low exergy and a second setting water temperature preset corresponding to high exergy; and   a controller configured to transmit a switching signal to the heat source device to instruct the heat source device regarding which one of the first setting water temperature and the second setting water temperature the setting water temperature of the heat-exchange water is to be switched to, and perform loading of a preset indoor temperature allowable range, a target water temperature difference, a setting value of an indoor temperature, and a setting air supply temperature, wherein the air conditioner includes:   a heat exchanger, through which the heat-exchange water flows; and
 a water regulating valve configured to increase and decrease an amount of heat-exchange water flowing through the heat exchanger to adjust a temperature difference between a temperature of the heat-exchange water at an inlet side of the heat exchanger and a temperature of the heat-exchange water at an outlet side of the heat exchanger and adjust the air supply temperature of the air-conditioning air, 
   the controller performs a first adjustment operation in a case where the indoor temperature is the setting value, the first adjustment operation including:
 transmitting a switching signal to the heat source device to instruct the heat source device to switch the setting water temperature of the heat-exchange water to the first setting water temperature; and 
 operating and controlling the water regulating valve to adjust the temperature difference between the temperature of the heat-exchange water at the inlet side of the heat exchanger and the temperature of the heat-exchange water at the outlet side of the heat exchanger to the target water temperature difference, and 
   the controller performs a second adjustment operation in a case where the indoor temperature is not the setting value, the second adjustment operation including:
 transmitting a switching signal to the heat source device to instruct the heat source device to switch the setting water temperature of the heat-exchange water to the second setting water temperature; and 
 operating and controlling the water regulating valve to adjust the air supply temperature of the air-conditioning air to the setting air supply temperature. 
   
     
     
         2 . The air-conditioning system according to  claim 1 , wherein
 in a case where the indoor temperature deviates from the indoor temperature allowable range, the controller outputs a switching signal to the heat source device to instruct the heat source device to switch the setting water temperature of the heat-exchange water to the second setting water temperature, and   when a setting elapsed time has passed after the indoor temperature reaches the setting value, if a state where the indoor temperature is in the indoor temperature allowable range is maintained, the controller outputs a switching signal to the heat source device to instruct the heat source device to switch the setting water temperature of the heat-exchange water to the first setting water temperature.   
     
     
         3 . The air-conditioning system according to  claim 1 , wherein
 in a case where the heat-exchange water is cold water, the first setting water temperature is set to 9 to 11° C., and the second setting water temperature is set to 6 to 8° C., and   in a case where the heat-exchange water is hot water, the first setting water temperature is set to 34 to 36° C., the second setting water temperature is set to 39 to 41° C., and the target water temperature difference is set to 9 to 11° C.   
     
     
         4 . The air-conditioning system according to  claim 1 , comprising a water circulating apparatus configured to circulate the heat-exchange water between the heat source device and the heat exchanger, wherein
 the water circulating apparatus includes:
 a cold water circulation passage, through which the heat-exchange water that is cold water flows; 
 a hot water circulation passage, through which the heat-exchange water that is hot water flows; and 
 a water circulation passage switching mechanism configured to connect the cold water circulation passage, the hot water circulation passage, and the heat exchanger, and switch the heat-exchange water flowing through the heat exchanger between the cold water and the hot water. 
   
     
     
         5 . The air-conditioning system according to  claim 1 , wherein
 the heat exchanger includes a heat transfer pipe, through which the heat-exchange water flows, and   the heat transfer pipe has an ellipsoidal cross section.   
     
     
         6 . The air-conditioning system according to  claim 2 , wherein
 in a case where the heat-exchange water is cold water, the first setting water temperature is set to 9 to 11° C., and the second setting water temperature is set to 6 to 8° C., and   in a case where the heat-exchange water is hot water, the first setting water temperature is set to 34 to 36° C., the second setting water temperature is set to 39 to 1° C., and the target water temperature difference is set to 9 to 11° C.   
     
     
         7 . The air-conditioning system according to  claim 2 , comprising a water circulating apparatus configured to circulate the heat-exchange water between the heat source device and the heat exchanger, wherein
 the water circulating apparatus includes:
 a cold water circulation passage, through which the heat-exchange water that is cold water flows; 
 a hot water circulation passage, through which the heat-exchange water that is hot water flows; and 
 a water circulation passage switching mechanism configured to connect the cold water circulation passage, the hot water circulation passage, and the heat exchanger, and switch the heat-exchange water flowing through the heat exchanger between the cold water and the hot water. 
   
     
     
         8 . The air-conditioning system according to  claim 2 , wherein
 the heat exchanger includes a heat transfer pipe, through which the heat-exchange water flows, and   the heat transfer pipe has an ellipsoidal cross section.