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Engineering · Mechanical Engineering
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/6.107 Figure P6.107 provides the schematic of a heat pump using Refrigerant 134a as the working fluid, together with steady-state data at key points. The mass flow rate of the refrigerant is 7 kg/min, and the power input to the compressor is 5.17 kW. (a) Determine the coeffi cient of performance for the heat pump. (b) If the valve were replaced by a turbine, power could be produced, thereby reducing the power requirement of the heat pump system. Would you recommend this power-saving measure? Explain. 437 b) .53 k
274 CHAPTER 6 Using Entropy Qout Saturated liquid P2=p3 = 9 bar T2 = 60°C Condenser We = 5, 17 kW Expansion Compressor A valve Evaporator 4 m= 7 kg/mín Pi = P4 = 2.4 bar in FIGURE P6.107 V 6.109 As shown in Fig. P6.109, air enters the diffuser of a jet engine 18 kPa, 216 K with a velocity of 265 m/s, all data corresponding
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