Patent ID: 11867414
Assignee: DAIKIN EUROPE N.V.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A system for air-conditioning and hot-water supply configured to alternatively perform a cooling operation and a heating operation, comprising:
an outdoor unit having a compressor and an outdoor heat exchanger;
a plurality of indoor units each of which is connected to the outdoor unit and includes an indoor heat exchanger and a first expansion valve, each indoor unit being configured to control a room temperature;
a hot-water supply unit connected to the outdoor unit so as to be arranged in parallel to the plurality of indoor units and including a refrigerant-water heat exchanger and a second expansion valve; and
a controller configured to monitor an occurrence of a hot-water request for hot-water supply from the hot-water supply unit during the cooling operation performed at at least one of the plurality of indoor units, and then to stop the cooling operation performed at the at least one of the plurality of indoor units and to start the heating operation in accordance with the hot-water request;
wherein
a refrigerant circuit of the system for air-conditioning and hot-water supply has a first connection state in which the first expansion valve of at least one of the plurality of the indoor units are open and the second expansion valve is closed and a second connection state in which the first expansion valve of all of the plurality of the indoor units are closed and the second expansion valve is open,
the controller is further configured to set the refrigerant circuit to the first connection state when at least one of the plurality of indoor units performs the cooling operation by opening the first expansion valves of the indoor units, which perform the cooling operation, and closing the second expansion valve, and to the second connection state when the system performs the heating operation for hot-water supply,
the controller is further configured to monitor an occurrence of an indoor-unit request from any one of the plurality of indoor units; and
the controller is further configured to stop the heating operation and to resume said cooling operation where said indoor-unit request is an increase request for an increase of load of said cooling operation to reduce the room temperature,
wherein
the controller is further configured to determine that the increase request has occurred where said indoor-unit request occurred during said heating operation is a cooling request for a cooling operation and is from an indoor unit, which was not operating before starting the heating operation and which has received instruction to start the cooling operation.