FUND OF ENG THERMODYN(LLF)+WILEYPLUS
FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Refrigerators to preserve perishable foods have long been one of the essential appliances in a household. The refrigeration system of the household refrigerator is basically based on the vapor-compression refrigeration cycle, as shown in Figure Q2.1. Among the important components of the vapor-compressions refrigeration cycle are a throttling valve (A) and a compressor (B). In this refrigeration system, tetrafluoroethane (R-134a) is used as the refrigerant. Condenser W B A Evaporator Figure Q2.1: Basic components of a refrigeration system. (a) If the refrigerant enters A as a saturated liquid at 1100 kPa and leaves at 120 kPa, (i) Estimate the quality of the refrigerant at the exit of A. (ii) Calculate the temperature drop during the process. (iii)With appropriate assumptions, prove that the conservation of energy for A as follows the equation below, h= h2 (b) If the refrigerant enters B as a saturated vapor at 120 kPa with flow rate of 1.5 m³/min and leaves at 1100 kPa, (i) Calculate…
The mechanical efficiency and static pressure of fan are 44.3% and 20 m of air respectively. What is the static efficiency if the total pressure created by fan is 25 m of air?
If one 1.0 kW petrol engine consumes 1.5 litre/hr of gasoline, estimate the thermal efficiency of the engine (assume, S.G. of gasoline is 0.8, LHV = 45 MJ/kg).
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