5 in 004167 ft r2 075 in 00625 ft t 00625 in 0005208

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Unformatted text preview: 1812 x 10-3 ft C2 = 2.7046 x 10-3 Btu/°F A2 = 4.1666 x 10-2 ft h = 4 Btu/hr-ft2-°F Loading q = 10 Btu/hr Ton = 100°F Toff = 125°F To = 70°F Analysis Assumptions and Modeling Notes The conductivity resistance is assumed to be small compared with the thermal capacitance for both the heater and the box. A time of 12 min (0.2 hr) is arbitrarily selected to allow several cycles of response. The integration time step is chosen to be 0.001 and automatic time stepping is used to reduce the number of substeps. The nodes are arbitrarily located at the origin. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–351 VM159 Results Comparison Target ANSYS Ratio First “off” temp,°F 125 Between 124.842 - 125.003 - First “on” temp,°F 100 Between 100.854 - 99.564 - Figure 159.2 Box Temperature vs. Time 1–352 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. VM159 Figure 159.3 Control Status vs. Time ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–353 VM160: Solid Cylinder wi...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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