eml 3100 exam 3 review 2011

eml 3100 exam 3 review 2011 - Thermodynamics A rural...

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1 Thermodynamics A rural hospital requires 14,000 cfm of outdoor air for air conditioning. The 14,000 cfm of outdoor air is at 95 deg F db and 78deg F wb and has to be cooled and dehumidified to 54deg F db and 53deg F wb before being distributed to the hospital rooms. A refrigeration cycle using R-134a as a refrigerant is to be used for this process. The evaporator will operate at a saturation temperature of 35deg F and the condenser operates at a saturation temperature of 110 deg F. A diesel engine is to be used to power the compressor of the refrigeration cycle. This engine is to have a compression ratio of 20 and a cutoff ratio of 2.0. In this area there is a source of biofuel available that has a heating value of 119,000 btu/gallon. You can assume an ideal diesel cycle and an ideal refrigeration cycle for your analysis.
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2 Thermodynamics A. What is the cooling capacity required for the refrigeration system? ________________btu/h A. What is the mass flow of refrigerant required for the vapor compression cycle? ________Lbm/h A. What is the power input required to operate the refrigeration cycle compressor? _______Hp A. What is the COP for this refrigeration cycle? ___________ A. What is the efficiency of the diesel engine cycle? ______________ F. How many gallons per hour of biofuel are required to operate this engine in support of the refrigeration cycle?________________gal/hour
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3 Thermodynamics Diesel Engine, r = 20, r c = 2 Biofuel, 119,000 btu/gal Condenser Evaporator Compressor 95 deg F db 78% rh 54 deg F db, 53 deg F wb R-134a Air Conditioning Unit 14,000 cfm 110deg F, Satd liquid 35 deg F Sat’d Vapor 1 2 3 4
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4 Thermodynamics Strategy: Use psychrometric analysis to find the cooling requirement for air conditioning system in btu/h or tons. Analyze refrigeration cycle using the cooling requirement to get the flow rate of
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This note was uploaded on 08/03/2011 for the course EML 3100 taught by Professor Sherif during the Summer '08 term at University of Florida.

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eml 3100 exam 3 review 2011 - Thermodynamics A rural...

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