How a Heat Pump Works: Refrigeration Cycle Explained #1262004 (License: Personal Use)

This diagram depicts the vapor-compression refrigeration cycle essential to heat pump operation: (1) evaporator absorbs heat from the source, turning refrigerant into vapor; (4) the compressor raises its pressure and temperature; (3) the condenser releases heat to the target environment as refrigerant condenses; and (2) the expansion valve reduces pressure, cooling the refrigerant before it re-enters the evaporator. Arrows indicate refrigerant flow direction and phase transitions (red = warm/high-pressure, blue = cool/low-pressure).

Used in educational content about HVAC systems, thermodynamics, or sustainable heating/cooling technologies; serves users seeking technical understanding of heat pump mechanics for academic, DIY, or professional installation contexts.