Frame parts are arranged in a row, and in each of which a compressor, an air heat exchanger, a receiver, and a system-side electric component box corresponding to each other are installed as a single unit.

A heat source side unit connected to load side units by pipes and constituting a refrigerant circuit, includes a compressor that compresses refrigerant and discharges the refrigerant, a heat source side heat exchanger that serves as an evaporator or a radiator, a gas-liquid separator that separates inflow refrigerant into liquid refrigerant and gas refrigerant, a liquid refrigerant outlet from which the liquid refrigerant flows out being connected to a connecting pipe at a refrigerant inflow side in a case where the heat source side heat exchanger serves as the evaporator, a sixth connecting pipe that connects a gas refrigerant outlet of the gas-liquid separator from which the gas refrigerant flows out to a pipe at a refrigerant outflow side in a case where the heat source side heat exchanger serves as the evaporator, and an expansion device that controls passage of refrigerant in the sixth connecting pipe.

The present invention relates to an air conditioner. The air conditioner comprises: an indoor unit having an indoor heat exchanger installed therein; a first outdoor unit having a first outdoor heat exchanger and a first compressor installed therein; a second outdoor unit having a second outdoor heat exchanger and a second compressor installed therein; an auxiliary module which connects the indoor unit, the first outdoor unit, and the second outdoor unit; a first connection line by which the auxiliary module is connected to the first outdoor unit; a second connection line by which the auxiliary module is connected to the second outdoor unit; and a two-stage compression line by which the first outdoor unit is connected to the second outdoor unit.

An air conditioner and a method for controlling an air conditioner are provided. The air conditioner may include an EHP outdoor device configured to drive a first compressor using electric power, and having a first heat exchanger that evaporates or condenses a refrigerant; a GHP outdoor device having an engine configured to drive a second compressor using a burned gas and a second heat exchanger that evaporates or condenses the refrigerant; and a flow rate balancing device configured to connect the first heat exchanger with the second heat exchanger, and to control a flow rate of the refrigerant through the EHP outdoor device and the GHP outdoor device.

A heating, ventilation, and/or air conditioning (HVAC) system has a first variable refrigerant flow outdoor unit, a first ducted variable speed indoor unit configured to selectively exchange refrigerant with the first variable refrigerant flow outdoor unit, and a second indoor unit configured to selectively exchange refrigerant with the first variable refrigerant flow outdoor unit.

An air-conditioning apparatus includes a refrigerant circuit, an air-conditioning load state detection unit, an operation-state detection unit, and a controller. The refrigerant circuit includes a main circuit and a bypass circuit. The air-conditioning apparatus has a simultaneous heating and defrosting operation mode. In the simultaneous heating and defrosting operation mode, the controller controls a compressor, a pressure reducing device, and a defrosting refrigerant pressure-reducing device such that control amounts of the compressor, the pressure reducing device, and the defrosting refrigerant pressure-reducing device reach respective normal-time control target values that are set based on an air-conditioning load state and an operation state.

The present invention relates to a gas engine driven heat pump system (GHP) and, more particularly, to a gas engine driven heat pump system with a generator, the system including a generator that is driven to generate power by a gas engine in addition to driving a compressor by driving the gas engine, thereby using external power only in the early-state operation and, later, being able to drive a gas hat pump using self-power generated by the generator without using specific external power and to supply the power to an energy storage system (ESS) storing power and a power system requiring power in buildings, and the system further supplying hot water by restoring engine waste heat.

An air-conditioning apparatus includes a selection unit and a determination unit, the selection unit selecting a reverse-defrosting operation mode or a heating-defrosting simultaneous operation mode, the reverse-defrosting operation mode being a mode in which all of parallel heat exchangers are defrosted by stopping a heating operation, the heating-defrosting simultaneous operation mode being a mode in which each parallel heat exchanger is sequentially defrosted while continuing a heating operation, the determination unit determining whether or not a defrosting operation is to be started, in which the determination unit is configured to start the defrosting operation in a state where the amount of frost deposited on the parallel heat exchangers is smaller in a case where the heating-defrosting simultaneous operation mode is selected than in a case where the reverse-defrosting operation is selected.

An air-conditioning apparatus includes a refrigerant circuit and a controller. The refrigerant circuit includes a main circuit and a bypass circuit. The bypass circuit is connected, by a pipe, to each of a plurality of parallel outdoor heat exchangers via a defrosting refrigerant pressure-reducing device, a defrosting flow passage switching device, and a backflow prevention device. The controller switches a flow passage for use in introduction of refrigerant using the defrosting flow passage switching device, to select one of the plurality of parallel outdoor heat exchangers as a defrosting target to be defrosted; and supplies defrosting refrigerant whose pressure is reduced by the defrosting refrigerant pressure-reducing device to the selected one of the plurality of parallel outdoor heat exchangers.

An air conditioner may include a first compressor that compresses a refrigerant; a second compressor that compresses the refrigerant; an indoor heat exchanger that performs heat exchange between the refrigerant and air; a first four-way valve having a port connected to the first compressor; a first outdoor heat exchanger connected to a port of the first four-way valve; a first valve connected to a port of the first four-way valve; a second four-way valve having a port connected to the second compressor; a second outdoor heat exchanger connected to a port of the second four-way valve; a second valve connected to a port of the second four-way valve; a first valve pipe that connects a port of the first four-way valve and a port of the second four-way valve; a second valve pipe that connects the first valve and the second valve; and a third four-way valve having a port connected to the first valve pipe, a port connected to the second valve pipe, a port connected to the first compressor and the second compressor, and a port connected to the indoor heat exchanger.