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Buildings 2020+. EnErgy sourcEs where: Pin – h1– h2– mR– w– compressor output (kW), refrigerant enthalpy before compression (kJ/kg), refrigerant enthalpy after compression (kJ/kg), refrigerant mass flow rate (kg/s), specific compressor work (kJ/kg). The compressor compresses the refrigerant and discards it at high pressure. During compression, the internal energy and temperature of the gas increases. The isentropic compression cannot be achieved in a real process. This is because the internal friction of the fluid is never reduced to zero, and also because of the inevitable transfer of heat through the cylinder wall. 5.3.2. Second stage – Isobaric condensation p qc 32 4 1 h Fig. 5.6. Heat pump condensation in a p-h diagram (Source: own elaboration) In isobaric condensation, the heat energy (Fig. 5.6) is discharged to the environment by condensation of the refrigerant. The total output of the condenser can be determined from the p-h diagram and expressed by Eq. (5.4): Qc = (h3 – h2) · mR The specific condenser output rate is calculated by Eq. (5.5): qc = Qc/mR = (h3 – h2) where: QC– condenser output (kW), h2– refrigerant enthalpy before condenser (kJ/kg), h3– refrigerant enthalpy after condenser (kJ/kg), (5.4) (5.5) 150PDF Image | Heat Pumps 978-83-65596-73-4
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