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Question: a building shall be heated by a heat pump with...

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A building shall be heated by a heat pump with heating capacity equal to 200 KW. The heat pump is using ground water as heat source and R-134a as refrigerant. The condensing and evaporating temperature are respectively equal to 70°C and -10°C. The sub-cooled liquid R124a at the condenser outlet is -50 C and the vapor at the compressor inlet is saturated. The isentropic efficiency for the compressor is equal to 80% 1. 2. 3. 4. 5. Calculate the specific work needed for the compressor Sketch the P-h diagram Calculate the specific heat exchanged for the condenser and the evaporator Determine the COP of heat pump Calculate the mass flow rate of water used as heating medium in the evaporator. Given ATwater 10°C and Cw-4.18KJIKg/oC Consider the same cycle, but in this case, the refrigerant at the condenser outlet is saturated. What would the effect of sub-cooling on the COP? 6.

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