During which phase does the compressor in a heat pump operate to absorb heat from the evaporator?

The compressor in a heat pump is designed to absorb heat from the evaporator during the suction stroke. During this phase, the compressor takes in low-pressure refrigerant vapor from the evaporator. As the refrigerant enters, it carries heat that has been absorbed from the indoor or outdoor environment (depending on the mode of operation). This is a crucial part of the heat transfer process, as it allows the heat pump to effectively extract heat from a source and prepare the refrigerant for compression.

In this phase, the compressor's action is vital for transforming the low-pressure refrigerant vapor into a high-pressure vapor, which subsequently moves to the discharge phase. This process enables the heat pump to continue circulating refrigerant and absorbing heat, making heating and cooling possible in residential applications. Understanding this phase is essential for anyone looking to operate or maintain heat pump systems effectively.