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Thermodynamics

2.56 A gas within a piston-cylinder assembly undergoes a thermo- dynamic cycle consisting of three processes: Process 1-2: Constant volume V1 m, pi bar, to p2 3 bar, U2- U400 kJ Process 2-3: Constant pressure expansion to V 2 m3 Process 3-1: Adiabatic compression, with W1120 kJ There are no significant changes in kinetic or potential energy. De- termine the net work for the cycle, in kJ, and the heat transfers for Processes 1-2 and 2-3, in kJ. Is this a power cycle or refrigeration cycle? Explain. A heat pump cycle delivers energy by heat ransfer to a 2.71 dwelling at a rate of 11.7 kW. The coefficient of performance of the cycle is 2.8. WP a. Determine the power input to the cycle, in kW. b. Evaluating electricity at $0.10 per kWh, determine the cost of electricity during the heating season when the heat pump op- erates for 1800 hours

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ven +ot gas iin a pion- cder ausembt on de rgoes a e mo dynamie eycs onsisting of tber ports Pastore (P ) 1ba (R) a baf Proresansanvolo ne Wnk done baf Al 1-1-0 Pdvo 400 k 1

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