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(subgeothermal, groundwater, heat pump, energy efficiency, eastern Serbia)
used (GORIČANEC et al. 2008):– a single stage heat pump,– a two stage heat pump with a flash vessel, – a two stage heat pump with a heat transmitter.Using a single stage heat pump for heating buildings, the temperature of the

,schematically shown in Figure 3. The heat pump infact consists of the two single stage heat pumps whichare connected by a heat transmitter. The advantage ofsuch a cascade heat pump is that, according to theirphysical-chemical

surfaces or a high-temperature heat pumpwith excellent efficiency is required. The development of a cascade type heat pump and its wide applicationwould enable more efficient utilization of widely available and easy replenished