| 摘要 |
To provide a refrigerating and air-conditioning apparatus capable of performing an operation for defrosting an outdoor heat exchanger in a heating operation under such air conditions that the outdoor heat exchanger is frosted, while continuing the heating operation. The refrigerating and air-conditioning apparatus includes multiple refrigeration cycles each including a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a pressure reducing device 4, and an outdoor heat exchanger 5 which are connected by a pipe, each refrigeration cycle being configured to be capable of performing a cooling operation and a heating operation, an outdoor fan 7 configured to send air for heat exchange with the outdoor heat exchangers 5 of the refrigeration cycles, multiple indoor fans 6 arranged corresponding to the respective indoor heat exchangers 3 of the refrigeration cycles, each indoor fan being configured to create air flow to be sent through the respective indoor heat exchanger 3 to an air-conditioning target space, and a controller 8 configured to, when at least one of the refrigeration cycles starts a defrosting operation to defrost the outdoor heat exchanger of the at least one refrigeration cycle 5, control a rotation speed of the indoor fan 6 corresponding to the refrigeration cycle performing the defrosting operation such that a temperature of air mixed by air-sending through the indoor fans 6 reaches a predetermined temperature. |
