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Buildings 2020+. EnErgy sourcEs The system (Fig. 5.21) has the same units as a single absorption cycle. The difference is that a pump (Fig. 5.21, pos. 3) is installed between the condenser and the evaporator. The intermediate temperature heat QI supplied to the generator (Fig. 5.21) is used to evaporate the refrigerant from the solution. The refrigerant is supplied to the condenser (Fig. 5.21) that emits heat QL. Liquid refrigerant is pumped from the condenser to the evaporator. The pump raises the pressure in the evaporator. Liquid refrigerant is evaporated using the same intermediate waste heat QI used to drive the generator. The vapour refrigerant is absorbed by the solution in the absorber which discarded the heat in a high temperature environment. 5.11. Examples of practical applications Ground heat pumps Heat pumps often use ground as a lower heat source. Heat exchangers are installed in a horizontal or vertical position as shown in Fig. 5.22. Fig. 5.22. Scheme of the system with a heat pump: 1 – horizontal heat exchanger, 2 – vertical heat exchanger, 3 – heat pump, 4 – radiator (Source: own elaboration) Vertical ground heat pumps (Fig. 5.23) can be used even in small areas, however the knowledge of ground layers is necessary. The boreholes are mostly drilled to depths from 30 to 120 m. Fig. 5.24 shows the equipment for drilling vertical boreholes. 172PDF Image | Heat Pumps 978-83-65596-73-4
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