How does refrigerant flow through the compressor in a heat pump?

In a heat pump, the flow of refrigerant through the compressor is influenced by the system's operating mode, whether it is in heating or cooling mode. It specifically adapts to changes in refrigerant pressure and temperature, which vary based on the intended heating or cooling function.

When in cooling mode, refrigerant absorbs heat from the indoor air and is then compressed in the compressor before releasing that heat outside. Conversely, in heating mode, the refrigerant absorbs heat from the outdoor air and releases it indoors after being compressed. This means the flow is not constant but variable, changing with the operational cycle of the heat pump.

Furthermore, during the defrost cycle, which occurs in heating mode to remove ice buildup on the outdoor coil, the direction of the refrigerant flow is altered to facilitate this process. This again indicates that the flow is not always the same, contrasting with the notion that it would remain unchanged regardless of the operating mode.

Thus, the correct understanding emphasizes that the refrigerant flow is dependent on the mode of operation of the heat pump, reflecting the complexity and adaptability of the system in response to heating or cooling demands.