An absorption heat pump (AHP) is a heat pump driven by thermal energy such as combustion of natural gas, steam solar-heated water, air or geothermal-heated water[1][2] differently from compression heat pumps that are driven by mechanical energy.[citation needed]
AHPs are more complex and require larger units compared to compression heat pumps.[3] In particular, the lower electricity demand of such heat pumps is related to the liquid pumping only.[3] Their applications are restricted to those cases when electricity is extremely expensive or a large amount of unutilized heat at suitable temperatures is available and when the cooling or heating output has a greater value than heat input consumed.[3] Absorption refrigerators also work on the same principle, but are not reversible and cannot serve as a heat source.[citation needed]
^Cite error: The named reference :0 was invoked but never defined (see the help page).
^Romero, Rosenberg J.; Silva-Sotelo, Sotsil (2017-06-28), Mendes, Marisa Fernandes (ed.), "Energy Evaluation of the Use of an Absorption Heat Pump in Water Distillation Process", Distillation – Innovative Applications and Modeling, InTech, doi:10.5772/67094, ISBN 978-953-51-3201-1, retrieved 2020-07-14
^ abcBerntsson, Thore; Harvey, Simon; Morandin, Matteo (2013-01-01), Klemeš, Jiří J. (ed.), "5 – Application of Process Integration to the Synthesis of Heat and Power Utility Systems Including Combined Heat and Power (CHP) and Industrial Heat Pumps", Handbook of Process Integration (PI), Woodhead Publishing Series in Energy, Woodhead Publishing, pp. 168–200, doi:10.1533/9780857097255.2.168, ISBN 978-0-85709-593-0, retrieved 2020-07-14
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