Air conditioner using heat exchange water and air conditioning system including the same

An air conditioning system comprising:

• an air conditioner which includes:
• a first heat exchanger configured to perform a first process of cooling or heating air-conditioning air by heat-exchange water that flows through the first heat exchanger, the air-conditioning air containing outside air from outside of a space to be air conditioned and return air from the space to be air conditioned;
• a second heat exchanger configured to perform a second process of cooling or heating the air-conditioning air by the heat-exchange water that flows through the second heat exchanger;
• a first water passage configured to cause the heat-exchange water to flow through the first heat exchanger and then flow through the second heat exchanger;
• a second water passage branching off from the first water passage and configured to cause the heat-exchange water that has been used in the first process to flow in a manner to bypass the second heat exchanger;
• a first water regulating valve configured to adjust a flow rate of the heat-exchange water to adjust performance of the first heat exchanger in the first process;
• a second water regulating valve configured to adjust a flow rate distribution of the heat-exchange water between the first water passage and the second water passage to adjust performance of the second heat exchanger in the second process;
• and
• an air conditioner control device including a first processor configured to operate the first water regulating valve and the second water regulating valve to adjust the air-conditioning air to be in a suitable air condition for air conditioning of the space to be air conditioned;
• a chiller configured to adjust a supply water temperature of circulating water that is supplied to the air conditioner for air condition adjustment of the air-conditioning air;
• and
• a chiller control device independent of the air conditioner control device, the chiller control device including a second processor configured to automatically adjust the supply water temperature of the circulating water in accordance with variation in an outside air load, wherein
• at a time of performing cooling of the space to be air conditioned, the air conditioning system sets the supply water temperature of the circulating water, which is automatically adjusted by the chiller control device, such that:
• when a temperature and a humidity of the outside air are higher than a preset outside air temperature and a preset outside air humidity, the supply water temperature of the circulating water is set to 6 to 7° C.;
• when the temperature of the outside air is lower than the preset outside air temperature and the humidity of the outside air is higher than the preset outside air humidity, the supply water temperature of the circulating water is set to 7 to 8° C.;
• when the temperature of the outside air is higher than the preset outside air temperature and the humidity of the outside air is lower than the preset outside air humidity, the supply water temperature of the circulating water is set to 8 to 9° C.;
• and when the temperature and the humidity of the outside air are lower than the preset outside air temperature and the preset outside air humidity, the supply water temperature of the circulating water is set to 9 to 10° C., and
• at a time of performing heating of the space to be air conditioned, the air conditioning system sets the supply water temperature of the circulating water, which is automatically adjusted by the chiller control device, such that:
• when the temperature of the outside air is higher than the preset outside air temperature, the supply water temperature of the circulating water is set to 34 to 36° C.;
• and when the temperature of the outside air is lower than the preset outside air temperature, the supply water temperature of the circulating water is set to 39 to 41° C.