eml 3100 exam 3 review 2011

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

This preview shows pages 1–5. Sign up to view the full content.

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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 14

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

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online