Sample Exam 3 (C) - EML 3100 Thermodynamics Fall 2012 Exam...

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EML 3100 Thermodynamics Fall 2012 Exam 3 Friday, November 30 Instructor: Philip Jackson Materials allowed: - Basic calculator and/or graphing calculator - Supplied formula and data sheets - CLOSED BOOK - CLOSED NOTES
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EML 3100 Exam 3 Fall 2012 Friday, November 30 Name UF-ID
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Problem 1 (20 points): Consider the ideal, steady-state gas-refrigeration cycle shown in the schematic below. The working fluid is helium and the following operating conditions are known. Use properties for helium at STP and assume that the specific heats are constants. T 1 = -125 °C, T 2 = 275 °C, T 3 = 50 °C, T 4 = -185 °C, P 2 / P 1 = 26, T L = 175 K, T H = 300 K (A) Complete the vertical axis of the phase diagram provided by labeling the mean effective temperatures, 𝑇 𝐿 and 𝑇 𝐻 , the min. and max. process temperatures, 𝑇 𝐿 and 𝑇 𝐻 , and the reservoir temperatures, 𝑇 𝐿 and 𝑇 𝐻 . (B) Calculate the mean effective process temperature, 𝑇 𝐿 .
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