Reverse Carnot cycles Refrigeration/Heat pump cycle Process 1-2:gas expands isothermally at Shaded area:input work 1 Tc while receiving energy Qc from cold reservoir Process 2-3:gas compressed adiabatically 3 TH=const. until its temperature is TH. net.in Process 3-4:gas compressed isothermally at TH while it discharges Te const. energy QH to hot reservoir. c 2 Process 4-1:gas expands adiabatically until its temperature decreases to Tc. 上游充通大 April 9,2019 8 SHANGHAI JIAO TONG UNIVERSITYApril 9, 2019 8 Reverse Carnot cycles Refrigeration / Heat pump cycle : Process 1–2: gas expands isothermally at TC while receiving energy QC from cold reservoir Process 2–3: gas compressed adiabatically until its temperature is TH . Process 3–4:gas compressed isothermally at TH while it discharges energy QH to hot reservoir. Process 4–1: gas expands adiabatically until its temperature decreases to TC . Shaded area: input work