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Unformatted text preview: Department of Mechanical Science and Engineering ME 300 Thermodynamics Section D Fall 2009 Homework #4 due Friday, September 25 th Problem 4.1 Determine the specific volume of refrigerant-134a vapor at 0.9 MPa and 70 ◦ C based on: (a) the ideal-gas equation (b) the generalized compressibility chart (c) data from tables. (d) Determine the error involved for case (a) and (b) when compared to your answer from part (c). Problem 4.2 Complete the following table by using the steam tables (Table A-1 to A-5) T p h x Phase Description ◦ C kPa kJ/kg- (a) 200 0.7 (b) 140 1800 (c) 950 (d) 80 500 (e) 800 3162.2 Problem 4.3 (a) On the attached P-v diagram for R-134a sketch the constant temperature process through the interme- diate state p i =280kPa, v i =0.06m 3 /kg as pressure changes from the initial state of p 1 =400kPa to the final state p 2 =90kPa. Mark the three states on the diagram and use arrows to indicate the direction of the pro- cess. Determine the temperature of the process and label the isotherm (dotted line in diagram) accordingly.cess....
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This note was uploaded on 09/30/2011 for the course ME 300 taught by Professor Staff during the Fall '08 term at University of Illinois, Urbana Champaign.
- Fall '08