DLP-CH-PP106: Document in the field of Central Heating Heating Theory & Heating Techniques Principle of heating pumps

The document contains a detailed explanation of how a heat pump transfers heat using a refrigerant. The process begins with the refrigerant as a low-pressure, low-temperature liquid, which absorbs heat from outside air via an external heat exchanger, evaporating into a gas. This gas then enters a compressor, increasing its temperature and pressure, turning it into a high-temperature gas. The hot gas releases its heat indoors through an indoor heat exchanger, condensing back into a liquid. The liquid refrigerant then passes through an expansion valve, reducing its pressure and temperature, and returns to a low-temperature liquid state, ready to absorb heat again. The document also compares air-source heat pumps, which draw heat from the air, with ground-source heat pumps, which draw heat from the earth and are more efficient but costlier to install. Additionally, it mentions heat pumps that use solar-heated water or natural gas. In heating mode, the heat pump draws heat from outside to warm the house, while in cooling mode, it removes indoor heat and releases it outside, functioning like an air conditioner.

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