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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]
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.
Propane may be the most suitable for high temperature heat pumps. [53] 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. [54] A 2024 report said that refrigerants with GWP are vulnerable to further international restrictions. [55]
Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] 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]
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]
For a heat engine, thermal efficiency is the ratio of the net work output to the heat input; in the case of a heat pump, thermal efficiency (known as the coefficient of performance or COP) is the ratio of net heat output (for heating), or the net heat removed (for cooling) to the energy input (external work). The efficiency of a heat engine is ...
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