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- ДокументEfficiency evaluation of domestic solar assisted ground-source heat pump system for southern Ukrainian region(2017) Ostapenko, O.; Yakovleva, O.; Khmelniuk, M.With raising energy prices and more restricted environment regulations, the rational use of energy resources in household sector becomes more important. It is directly linked to increasing energy needs of humanity and the simultaneous depletion of traditional non-renewable energy resources in the world as a whole and in individual regions. Heat pumps are widely used in the chemical and food industries, housing and communal services. The use of heat pumps allows reducing greenhouse gas and carcinogenic substances emissions and, thus reducing human impact on the environment. The heat pump performance is based with following factors: the temperature of heat source, schematic diagram of the heat pump, climate conditions of the region, working fluids of heat pump (refrigerants and intermediate coolants), heat pump elements (type of compressors, heat exchangers, control systems).