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2. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   Propane may be the most suitable for high temperature heat pumps. [73] Ammonia (R717) and carbon dioxide also have a low GWP. As of 2023 smaller CO 2 heat pumps are not widely available and research and development of them continues. [74] A 2024 report said that refrigerants with GWP are vulnerable to further international restrictions. [75]

3. Heat pump and refrigeration cycle - Wikipedia

   en.wikipedia.org/wiki/Heat_pump_and...

   A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2] Thus a heat pump may be thought of as a "heater" if the objective is to warm the heat sink (as when warming the inside of a home on a cold day), or a ...

4. Absorption-compression heat pump - Wikipedia

   en.wikipedia.org/wiki/Absorption-compression...

   This configuration is used to increase the temperature of waste heat since it allow high absorption temperature at lower pressure than compression heat pumps. [11] Another possible configuration for the absorption compression heat pump is obtained from the combination of a gas-driven absorption heat pump (GAHP) with a vapor-compression heat pump.

5. Ground source heat pump - Wikipedia

   en.wikipedia.org/wiki/Ground_source_heat_pump

   Ground-source heat pumps take advantage of the difference between the ambient temperature and the temperature at various depths in the ground. The thermal properties of the ground near the surface [2] [3] can be described as follows: In the surface layer to a depth of about 1 meter, the temperature is very sensitive to sunlight and weather.

6. Absorption heat pump - Wikipedia

   en.wikipedia.org/wiki/Absorption_heat_pump

   For low-temperature heat sources of 15–25 °C, driven by a small amount of high-temperature heat sources (such as high-temperature steam or direct combustion), cold water at a temperature of 7–15 °C and hot water at a temperature above 47 °C can be prepared. 1.2, >1.5 when heating. [4]

7. Working fluid selection - Wikipedia

   en.wikipedia.org/wiki/Working_fluid_selection

   The choice of working fluids is known to have a significant impact on the thermodynamic as well as economic performance of the cycle. A suitable fluid must exhibit favorable physical, chemical, environmental, safety and economic properties such as low specific volume (high density), viscosity, toxicity, flammability, ozone depletion potential (ODP), global warming potential (GWP) and cost, as ...