Air conditioning apparatus having heat-source-side expansion valve control

摘要

An air conditioning apparatus includes a heat source unit, usage units, and a controller. The heat source unit has a compression mechanism, a heat-source-side heat exchanger operable at least as an evaporator, and a heat-source-side expansion valve. The usage units have usage-side heat exchangers operable at least as condensers, and usage-side expansion valves. The controller regulates the opening degree of the heat-source-side expansion valve based on the opening degrees of the usage-side expansion valves.

主权项

1. An air conditioning apparatus, comprising:
a heat source unit having a compression mechanism, a heat-source-side heat exchanger operable at least as an evaporator, an accumulator on an intake side of the compression mechanism, and a heat-source-side expansion valve; a plurality of usage units having usage-side heat exchangers operable at least as condensers, and usage-side expansion valves; and a controller configured
to regulate an opening degree of the heat-source-side expansion valve based on opening degrees of the usage-side expansion valves,to set a degree of subcooling target value for each of the usage units in accordance with a required load of each of the usage units, andto regulate the opening degree of the heat-source-side expansion valve based on a representative opening degree of the usage-side expansion valves of die usage units so that an amount of depressurization by a usage-side expansion valve at the representative opening degree maintains refrigerant upstream of the heat-source-side expansion valve in a liquid phase.