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Refrigerant 134a enters an air-cooled condenser at 12 bars and 60°C, and leaves as a saturated liquid at 12 bars. Atmospheric air at 35°C is blown over the condenser tubes and leaves at 45°C. The heat transfer between the two fluid streams equals 25 MJ/h. Changes in kinetic and potential energy are negligible. Make any reasonable assumptions if necessary. Determine (a) the mass flow rates for the R-134a and the air, in kg/h, Hint: Use the energy conservation on each of the {uid streams separately. (b) the entropy production rate in the condenser, in kJ h-'K-, Hint: Use the entropy balance over the whole condenser.

Refrigerant 134a enters an air-cooled condenser at 12 bars and 60°C, and leaves as a saturated liquid at 12 bars. Atmospheric air at 35°C is blown over the condenser tubes and leaves at 45°C. The heat transfer between the two fluid streams equals 25 MJ/h. Changes in kinetic and potential energy are negligible. Make any reasonable assumptions if necessary. Determine (a) the mass flow rates for the R-134a and the air, in kg/h, Hint: Use the energy conservation on each of the {uid streams separately. (b) the entropy production rate in the condenser, in kJ h-'K-, Hint: Use the entropy balance over the whole condenser.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Refrigerant 134a enters an air-cooled condenser at 12 bars and 60°C, and leaves as a saturated liquid at 12 bars. Atmospheric air at 35°C is blown over the condenser tubes and leaves at 45°C. The heat transfer between the two fluid streams equals 25 MJ/h. Changes in kinetic and potential energy are negligible. Make any reasonable assumptions if necessary. Determine (a) the mass flow rates for the R-134a and the air, in kg/h, Hint: Use the energy conservation on each of the { uid streams separately. (b) the entropy production rate in the condenser, in kJ h-'K-1, Hint: Use the entropy balance over the whole condenser. (c) the change in kinetic energy for R-134a if the pipe diameter is 2.0 cm, in kJ/h (d) Draw the T-s diagram for the process for R-134a. Air P=1 atm T3= 35°C %3! Ref rant 134a R-134a P = 12 bar 2 T = 60°C R-134a P2 = 12 bar Air 4- T4= 45°C
Transcribed Image Text:Refrigerant 134a enters an air-cooled condenser at 12 bars and 60°C, and leaves as a saturated liquid at 12 bars. Atmospheric air at 35°C is blown over the condenser tubes and leaves at 45°C. The heat transfer between the two fluid streams equals 25 MJ/h. Changes in kinetic and potential energy are negligible. Make any reasonable assumptions if necessary. Determine (a) the mass flow rates for the R-134a and the air, in kg/h, Hint: Use the energy conservation on each of the { uid streams separately. (b) the entropy production rate in the condenser, in kJ h-'K-1, Hint: Use the entropy balance over the whole condenser. (c) the change in kinetic energy for R-134a if the pipe diameter is 2.0 cm, in kJ/h (d) Draw the T-s diagram for the process for R-134a. Air P=1 atm T3= 35°C %3! Ref rant 134a R-134a P = 12 bar 2 T = 60°C R-134a P2 = 12 bar Air 4- T4= 45°C
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