| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an air-conditioning unit capable of simultaneously performing a cooling operation and a heating operation, a valve unit used in the air-conditioning system, and an operation method of the air-conditioning system, with respect to the air-conditioning system using the cold/hot water at a primary side and a phase-change refrigerant at a secondary side. <P>SOLUTION: This air-conditioning system comprises flow channels 71a, 72a connected to main gas flow channels (refrigerant pipe 22a, 24a) of first and second primary heat exchangers exchanging heat with cold/hot water, flow channels 73a, 74a connected to main liquid flow channels (refrigerant pipes 22b, 24b) of the first and second primary heat exchangers, opening and closing valve 75 disposed in the flow channel 71a, a check valve 76 for permitting flow to the refrigerant pipe 24a, and an opening and closing valve 77, disposed in the flow channel 72a, an opening and closing valve 78 disposed in the flow channel 73a, an opening and closing valve 79 and a check valve 80 for preventing the flow to the refrigerant pipe 24b, disposed in the flow channel 74a, and an indoor machine unit 61 for connecting each of the flow channels to an indoor machine 63. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
