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[EnergyPlus_Support] Lighting Heat Gain - Space gain Fraction
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- Subject: [EnergyPlus_Support] Lighting Heat Gain - Space gain Fraction
- From: "Jean marais" <jeannieboef@xxxxxxxxx>
- Date: Fri, 01 Jun 2012 05:45:05 -0000
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Dear Group,
I would like your thoughts on how you incorporate the lighting heat gain fractions into the zone when assessing a suspended ceiling situation, with a) ducted and b) plenumn exhaust.
Q1) Return Air Fraction: Where does e+ send the energy when no return-air-fraction coefficients are specified ( i.e. Return Air Fraction Calculated from Plenum Temperature = No) , but a Return Air Fraction > 0 is specified? Does the equation fconvected = 1.0 â?" (Return Air Fraction + Fraction Radiant + Fraction Visible) still apply? Does Return Air Fraction energy contribute to the exhaust air stream temp for subject zone, or is it just lost?
Q2) How does the table in the io ref
Table 13. Approximate values of Return Air Fraction, Fraction Radiant and Fraction Visible for overhead fluorescent lighting for different luminaire configurations. These values assume that no light heat goes into an adjacent zone. Source: Lighting Handbook: Reference & Application, 8th Edition, Illuminating Engineering Society of North America, New York, 1993, p. 355.
compare to
Table 3 in chapter 18.6 2009 ASHRAE HOF
?
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