Automobile air-conditioner gives up 18 kW at 65 km/h if the outside temperature is 35°C. The refrigerant temperature is constant at 65°C under these conditions, and the air rises 6°C in temperature as it flows across the heat exchanger tubes. The heat exchanger is of the finned-tube type shown in Fig. 3.6b, with U? 200 W/m°K. If U? (Air velocity) 0.7 and the mass flow rate increases directly with the velocity, plot the percentage reduction of heat transfer in the condenser as a function of air velocity between 15 and 65 km/h. b. A section of an automotive air condition- tall wavy
Automobile air-conditioner gives up 18 kW at 65 km/h if the outside temperature is 35°C. The refrigerant temperature is constant at 65°C under these conditions, and the air rises 6°C in temperature as it flows across the heat exchanger tubes. The heat exchanger is of the finned-tube type shown in Fig. 3.6b, with U? 200 W/m°K. If U? (Air velocity) 0.7 and the mass flow rate increases directly with the velocity, plot the percentage reduction of heat transfer in the condenser as a function of air velocity between 15 and 65 km/h. b. A section of an automotive air condition- tall wavy
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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Transcribed Image Text:b. A section of an automotive air condition-
ing condenser. The flow through the horizon-
tal wavy fins is allowed to mix with itself while
the two-pass flow through the U-tubes remains
unmixed.
Transcribed Image Text:Automobile air-conditioner gives up 18 kW at 65 km/h
if the outside temperature is 35°C. The refrigerant
temperature is constant at 65°C under these
conditions, and the air rises 6°C in temperature as it
flows across the heat exchanger tubes. The heat
exchanger is of the finned-tube type shown in Fig.
3.6b, with U? 200 W/m°K. If U? (Air velocity) 0.7 and
the mass flow rate increases directly with the velocity,
plot the percentage reduction of heat transfer in the
condenser as a function of air velocity between 15 and
65 km/h.
b. A section of an automotive air condition- tall wavy
fins is allowed to mix with itself while unmixed
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