The vapor-compression cycle has four stages (compression, condensation, expansion, and evaporation) and one ultimate goal: converting refrigerant into a state that makes it useful as a heat transfer ...

A Dutch research team has outlined a new method to assess the coefficient of performance of air-to-water heat pumps by considering ambient temperature and relative humidity. The model is based on the ...

A heat pump functions as a typical air conditioning system in the cooling mode — absorbing heat from indoors and rejecting it outdoors. In heating mode, the coils reverse their functions. The outdoor ...