**** Entered By: dlooman @ 12/28/2007 03:33 PM ****
Q1: Simulation 11.0 is writing the Stefan Boltzman constant at 3.08e-11. What are the units for this number?
Q2: Why is the default value in ANSYS in BTU/hr.in^2.R^4 and not BTU/s.in^2.R^4?
Q3: How can the default value be converted to the value of 3.08E-11?
Unfortunately, the BIN unit system is not consistent between mechanical and thermal units.
A1: The units are in-lb/(sec-in^2-R^4)
A2: Internally we do use secs, but the Btuh is the most commonly used unit for heat rate.
A3: 1.199e-11 (Btu/(hr-in^2-R^4)*(9378.873in-lb/Btu)*(1hr/3600sec) = 3.1e-11
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**** Entered By: dlooman @ 12/28/2007 03:33 PM **** Q1: Simulation 11.0 is writing the Stefan Boltzman constant at 3.08e-11. What are the units for this number? Q2: Why is the default value in ANSYS in BTU/hr.in^2.R^4 and not BTU/s.in^2.R^4? Q3: How can the default value be converted to the value of 3.08E-11? Unfortunately, the BIN unit system is not consistent between mechanical and thermal units. A1: The units are in-lb/(sec-in^2-R^4) A2: Internally we do use secs, but the Btuh is the most commonly used unit for heat rate. A3: 1.199e-11 (Btu/(hr-in^2-R^4)*(9378.873in-lb/Btu)*(1hr/3600sec) = 3.1e-11 |
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