# Question Solved1 AnswerD.30 A small heat pump unit is used to heat water. The heat pump using R-134a has refrigerant entering the condenser at 800 kPa and 80 °C. The refrigerant leaves the condenser as a saturated liquid and leaves the evaporator as a saturated vapor. The evaporator temperature is 16°C. The refrigerant flow rate is 0.022 kg/s. Assume an adiabatic expansion valve and an adiabatic, but non-isentropic compressor. он © Work a) b) c) Sketch the T-S diagram for this refrigeration cycle, labeling the states. - Find the specific work to the compressor. (kJ/kg) W Find the specific heat, supplied out of the heat pump, to heat the water. (kJ/kg) OL Find the Coefficient of Performance (COP) for this heat pump. If the water flow is to be heated from 15 to 60 °C at a water flow rate of 0.1 kg/s, how much compressor power would be required to drive the heat pump? (You may assume a constant heat capacity for the water of 4.18 kJ/kgK) (kW) e)

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Transcribed Image Text: D.30 A small heat pump unit is used to heat water. The heat pump using R-134a has refrigerant entering the condenser at 800 kPa and 80 °C. The refrigerant leaves the condenser as a saturated liquid and leaves the evaporator as a saturated vapor. The evaporator temperature is 16°C. The refrigerant flow rate is 0.022 kg/s. Assume an adiabatic expansion valve and an adiabatic, but non-isentropic compressor. он © Work a) b) c) Sketch the T-S diagram for this refrigeration cycle, labeling the states. - Find the specific work to the compressor. (kJ/kg) W Find the specific heat, supplied out of the heat pump, to heat the water. (kJ/kg) OL Find the Coefficient of Performance (COP) for this heat pump. If the water flow is to be heated from 15 to 60 °C at a water flow rate of 0.1 kg/s, how much compressor power would be required to drive the heat pump? (You may assume a constant heat capacity for the water of 4.18 kJ/kgK) (kW) e)
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Transcribed Image Text: D.30 A small heat pump unit is used to heat water. The heat pump using R-134a has refrigerant entering the condenser at 800 kPa and 80 °C. The refrigerant leaves the condenser as a saturated liquid and leaves the evaporator as a saturated vapor. The evaporator temperature is 16°C. The refrigerant flow rate is 0.022 kg/s. Assume an adiabatic expansion valve and an adiabatic, but non-isentropic compressor. он © Work a) b) c) Sketch the T-S diagram for this refrigeration cycle, labeling the states. - Find the specific work to the compressor. (kJ/kg) W Find the specific heat, supplied out of the heat pump, to heat the water. (kJ/kg) OL Find the Coefficient of Performance (COP) for this heat pump. If the water flow is to be heated from 15 to 60 °C at a water flow rate of 0.1 kg/s, how much compressor power would be required to drive the heat pump? (You may assume a constant heat capacity for the water of 4.18 kJ/kgK) (kW) e)