Engineering thermodynamics by M. David Burghardt, James A. Harbach

By M. David Burghardt, James A. Harbach

Burghardt M.D., Harbach J.A. Engineering thermodynamics (4ed., Harper-Collins, 1993)(ISBN 0060410493)(L)

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Because the heat has been removed from the inside air, the air is now cooled and gets distributed with a blower fan around the interior of the vehicle, which cools it off. 2 Experimental Setup 19 In the test system, the evaporator stand consists of an automotive evaporator, an electric heater, an air-blower to circulate the air inside the duct to simulate environmental conditions, a temperature controller. A K type thermocouple is between the heater and the evaporator to measure the actual temperature.

2) No heat exchange with the environment. (3) The vapour bulk in the accumulator has a uniform pressure. A test was done to investigate the influence of external heat transfer to AC systems. The AC system ran at conditions with and without heat transfer between accumulator and the surroundings. 35 % for cooling loads. For practical purposes, it was acceptable to neglect the external heat transfer, so it can be assumed that there was no heat transfer between the accumulator and surroundings, and no liquid refrigerant evaporated inside accumulator.

The average density at point D is same as at point A, because they have the same vapour quality when the heat transfer between accumulator and its surroundings is ignored. qD ¼ qA V6À1 ¼ m_ pqD D2j ð4:46Þ ð4:47Þ 1 2 PdynÀD ¼ qD V6À1 2 ð4:48Þ PstagÀD ¼ PD þ PdynÀD ð4:49Þ From points D to E, the total pressure drops include: DP6–1 due to friction through l3, DP6–2 due to friction through lout, and DP6–3 due to a 90 ° bend. 24. 6 MATLAB program For the program in this work, a set of input parameters that fully describes the problem is defined.

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