Air-conditioning apparatus

An air-conditioning apparatus, comprising:

• a compressor configured to compress and discharge refrigerant;
• a heat source device-side heat exchanger configured to exchange heat between the refrigerant and a heat medium different from the refrigerant;
• a plurality of use-side heat exchangers configured to exchange heat between the refrigerant and a use-side medium around the plurality of use-side heat exchangers;
• a relay device provided between the heat source device-side heat exchanger and the plurality of use-side heat exchangers, the relay device includes a gas-liquid separator, a flow regulator, an intermediate heat exchanger, and a relay controller configured to switch at least one of the plurality of use-side heat exchangers to a cooling operation and switch others of the plurality of use-side heat exchangers to a heating operation;
• and
• at least one system including a heat-medium pump, a heat-medium flow regulator, and a heat-medium flow controller, as a heat medium system capable of regulating a flow rate of the heat medium supplied to the heat source device-side heat exchanger,
• the compressor and the heat source device-side heat exchanger being arranged in a heat source device and the plurality of use-side heat exchangers being arranged in an indoor unit,
• the air-conditioning apparatus being configured to switch each of the plurality of use-side heat exchangers to the cooling operation or the heating operation in accordance with a control command to perform a cooling and heating simultaneous operation,
• the heat-medium flow controller being configured to control the flow rate of the heat medium supplied to the heat source device-side heat exchanger by using an operating frequency of the compressor of the heat source device, a maximum frequency of the compressor of the heat source device, and a minimum frequency of the compressor of the heat source device,
• the heat-medium flow controller being configured to, depending on an operation mode of the heat source device, control the heat-medium flow regulator in four patterns including
• a zero flow rate for causing no heat medium to flow,
• a lower limit flow rate corresponding to a minimum flow rate defined by the heat source device,
• a computed flow rate calculated and defined based on the operating frequency of the compressor of the heat source device, the maximum frequency of the compressor of the heat source device, and the minimum frequency of the compressor of the heat source device, and
• a maximum flow rate corresponding to a rated flow rate of the heat-medium flow regulator.

An air-conditioning apparatus, comprising:

• a compressor configured to compress and discharge refrigerant;
• a heat source device-side heat exchanger configured to exchange heat between the refrigerant and a heat medium different from the refrigerant;
• a plurality of use-side heat exchangers configured to exchange heat between the refrigerant and a use-side medium around the plurality of use-side heat exchangers;
• a relay device provided between the heat source device-side heat exchanger and the plurality of use-side heat exchangers, the relay device includes a gas-liquid separator, a flow regulator, an intermediate heat exchanger, and a relay controller configured to switch at least one of the plurality of use-side heat exchangers to a cooling operation and switch others of the plurality of use-side heat exchangers to a heating operation;
• and
• at least one system including a heat-medium pump, a heat-medium flow regulator, and a heat-medium flow controller, as a heat medium system capable of regulating a flow rate of the heat medium supplied to the heat source device-side heat exchanger,
• the compressor and the heat source device-side heat exchanger being arranged in a heat source device and the plurality of use-side heat exchangers being arranged in an indoor unit,
• the air-conditioning apparatus being configured to switch each of the plurality of use-side heat exchangers to the cooling operation or the heating operation in accordance with a control command to perform a cooling and heating simultaneous operation,
• the heat-medium flow controller being configured to control the flow rate of the heat medium supplied to the heat source device-side heat exchanger by using an operating frequency of the compressor of the heat source device, a maximum frequency of the compressor of the heat source device, and a minimum frequency of the compressor of the heat source device,
• the heat-medium flow controller being configured to control the flow rate of the heat medium between a lower limit value of the heat medium defined by the heat source device and an upper limit value of a flow rate corresponding to a maximum opening degree of the heat-medium flow regulator,
• the heat-medium flow controller being configured to include a plurality of the lower limit values being set to be selectable depending on a characteristic of the heat-medium flow regulator.