Engineering, 25.03.2020 05:01 AdrienneFaye
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30 ℃ by rejecting its waste heat to cooling water that enters the condenser at 18 ℃ at a rate of 0.25 kg/s and leaves at 26 ℃. The refrigerant enters the condenser at 1.2 MPa and 65 ℃ and leaves at 42 ℃. The inlet state of the compressor is 60 kPa and -34 ℃ and the compressor is estimated to gain a net heat of 450 W from the surroundings. Determine the quality of the refrigerant at evaporator inlet.
Answers: 2
Engineering, 04.07.2019 18:10
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Engineering, 06.07.2019 04:10
Cold water (cp=4180j/kg k) leadıng to a shower enters a thin-walled double-pipe heat transfer at 15c at a rate of 0.25kg/s and is heated to 45c by hot water (cp=4190j/kg k) that enters at 100c at the rate of 3kg/s. if the overall heat transfer coefficient is 950w /m2 k , determıne the rate of heat transfer and the heat transfer surface area of the heat exchanger using e - ntu method
Answers: 1
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerate...
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