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Our Heat Pump --The Heating Cycle Step-by-Step
1. Heat Absorption (Evaporation):
Cold, liquid refrigerant is pumped through the outdoor evaporator coil.
A fan blows outside air over the coil. Even cold air (e.g., -15°C / 5°F) contains thermal energy.
The refrigerant is colder than the outside air, so it absorbs that heat energy and evaporates into a low-pressure, cold gas.
2. Compression:
This cold, gaseous refrigerant is sucked into the compressor.
The compressor squeezes (compresses) the gas. This process dramatically increases its pressure and temperature, turning it into a hot, high-pressure gas (now far hotter than the indoor air).
3. Heat Release (Condensation):
The hot gas flows into the indoor condenser coil.
A fan blows indoor air over this hot coil.
The refrigerant, being hotter than the indoor air, releases its heat to warm up your home's air.
As it loses heat, the refrigerant condenses back into a warm liquid.
4. Pressure Reduction (Expansion):
The warm, high-pressure liquid passes through the expansion valve.
This valve rapidly reduces the refrigerant's pressure, which causes its temperature to plummet, turning it back into a cold, low-pressure liquid.
The cycle repeats, continuously "pumping" heat from outside to inside.
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