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Buildings 2020+. EnErgy sourcEs 5.3. Functioning and components of compression heat pump system Qin Expansion valve Compressor Pin Qout Fig. 5.3. The energy flow in a heat pump system (Source: own elaboration) As it was mentioned above, the task of a compression heat pump is to transport heat energy from a low temperature level to a high temperature level (Fig. 5.3). The fluid used to heat the pump cycle is called a refrigerant. The refrigerant is a liquid or gaseous substance that circulates through the heat pump in turns absorbing, transporting and discharging heat. This can be achieved using the anti-clockwise cycle (Eicker, 2014). The system must satisfy the first law of thermodynamics, which says that all energy supplied must be equal to the energy discharged, and this relationship can be expressed by the following Eq. (5.1): where: Qc – Q0 – Pin – QC = Q0 + Pin total output of the condenser (kW), total output of the evaporator (kW), total compressor output (kW). (5.1) Calculations for a heat pump system are performed using the p-h diagram. The temperatures and pressures measured in a system can be plotted in the diagram and used to determine corresponding enthalpy, results are presented graphically. The theoretical calculation is extremely difficult, depending on very complicated relationships between thermal and calorific state variables for actual substances, which can be derived from Gibbs fundamental equations (Oughton & Wilson, 2015). The p-h diagram is an important tool, it means that calculation is not necessary. The specific enthalpy h is on the horizontal axis in the 148 Evaporator CondenserPDF Image | Heat Pumps 978-83-65596-73-4
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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