Patent ID: 9709304
Date: 2017-07-18
CPC Classifications: F25B

Claim:
1. An air-conditioning apparatus comprising: a compressor into which an intermediate-pressure refrigerant is allowed to be injected in the course of compressing a refrigerant; an outdoor heat exchanger; an indoor heat exchanger; a first path through which the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger; an injection pipe including a first end being connected to the compressor and a second end being connected to the first path; a flow passage switching device configured to switch connection of the outdoor heat exchanger; a second path connecting the flow passage switching device to the outdoor heat exchanger; an injection flow rate control device configured to control a flow rate of injection into the compressor; an outdoor-side flow rate control device configured to generate an intermediate pressure for injection into the compressor and that is able to change a flow passage resistance in a continuous manner; a bypass pipe bypassing the outdoor heat exchanger and the outdoor-side flow rate control device; a bypass flow rate control device provided to the bypass pipe in parallel to the outdoor-side flow rate control device being configured to change a flow passage resistance in a continuous manner, and being configured to control an amount of heat exchange of the outdoor heat exchanger together with the outdoor-side flow rate control device; and an indoor-side flow rate control device configured to adjust a flow rate of refrigerant to the indoor heat exchanger, wherein the compressor, the outdoor heat exchanger, the flow passage switching device, the injection flow rate control device, the outdoor-side flow rate control device, and the bypass flow rate control device are provided within an outdoor unit, wherein the indoor heat exchanger and the indoor-side flow rate control device are provided within an indoor unit, wherein the indoor unit includes a plurality of indoor units, which are connected to the outdoor unit in parallel, and wherein in accordance with an indoor load or an outside air temperature, one of control (a) and (b) is selectively performed: (a) control of the amount of heat exchange of the outdoor heat exchanger by the outdoor-side flow rate control device and the bypass flow rate control device; and (b) control of the intermediate pressure by the outdoor-side flow rate control device, the bypass flow rate control device, and the injection flow rate control device, and control of the flow rate of injection into the compressor in which the bypass flow rate control device is closed.