Question Solved1 Answer 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)

Z0HT1U The Asker · Mechanical Engineering

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)
More
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)
See Answer
Add Answer +20 Points
Community Answer
K4V6J9 The First Answerer
See all the answers with 1 Unlock
Get 4 Free Unlocks by registration

{:[{:[T_(1)=16^(@)c],[x_(1)=1]}h_(1)=259.51ko//ky],[{:[P_(2)=800kPa],[T_(2)=80^(@)C]}h_(2)=286.71kJ//hg],[" s "h_(3)=h_(4)=h_(7)" at "800" tPa "],[=95.48kolkg]:}b) Specific work to compressor, u=h_(alpha)-h_(1)=286*71-259.51ul=27.2kolkgc) ... See the full answer