In industry, heat pumps are used to deliver hot air, water or steam, or to directly heat materials. Many of the heat pumps can also provide space cooling in summer in addition to meeting space heating needs in winter. Heat pumps can be connected to a tank to produce sanitary hot water or provide flexibility in hydronic systems. In buildings, the heat is delivered using either forced air or hydronic systems such as radiators or under‐floor heating.
The heat is then passed on to a heat sink through another heat exchanger. Assumptions 1 Steady operating conditions exist. The pressure at which reheating takes place, the total rate of heat input in the boiler, and the thermal efficiency of the cycle are to be determined. The heat pump itself consists of a compressor, which moves a refrigerant through a refrigeration cycle, and a heat exchanger, which extracts heat from the source. A steam power plant that operates on an ideal reheat Rankine cycle between the specified pressure limits is considered. Heat pumps can be combined with other heating systems, commonly gas, in hybrid configurations. This makes current models 3‐5 times more energy efficient than gas boilers. the energy output is four times greater than the electrical energy used to run it. For example, the coefficient of performance (COP) for a typical household heat pump is around four, i.e. The output of energy in the form of heat is normally several times greater than that required to power the heat pump, normally in the form of electricity. Because most of the heat is transferred rather than generated, heat pumps are far more efficient than conventional heating technologies such as boilers or electric heaters and can be cheaper to run. The thermal efficiency of the cycle is 50. The work output from the low pressure turbine is 1500 kJ/kg. The work output from the high pressure turbine is 750 kJ/kg. It then amplifies and transfers the heat to where it is needed. Consider a steam power plant operating on an ideal reheat Rankine cycle. It extracts heat 1 from a source, such as the surrounding air, geothermal energy stored in the ground, or nearby sources of water or waste heat from a factory.
A heat pump uses technology similar to that found in a refrigerator or an air conditioner.
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