FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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1. Air enters a reversible compressor steadily and it is compressed from an inlet temperature and
pressure of 20 deg C and 100 kPa respectively. Air leaves the compressor at 900 kPa.Compute
the compressor power assuming a mass flow rate of air of 1.25 kg/sec.
w
In an ammonia refrigerator , the pressure in the evaporator is 267. 58 KPa and the ammonia at is 0.14 dry while at the exit is 0.86 dry . During compression the work done per kg of ammonia is 20 ,000 kg .m . Calculate volume of the vapor entering the compressor per minute if the rate of ammonia circulation is 6.54 kg. The compressor has a volumetric efficiency of 90% and it runs at 150 rpm .The ratio of stroke to bore is 1 .Latent enthalpy of ammonia at based on its evaporating pressure is 320 Kcal per kg and its latent specific volume of ammonia based on its evaporating pressure is 0.436 m3 per kg .Specific volume of ammonia
WITH PH DIAGRAM
An air cooled refrigerant condenser (similar to the ones used for home air conditioners) is shown, The system
condenses 0.1 kg/sec of 60 C R134A refrigerant. Air temperature rises by 5 C passing over the coils. Calculate the
mass flow rate of air pushed through the condenser.
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