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Re: [EnergyPlus_Support] total energy flow
It is very difficult to separate envelope loads from the total zone load,
because a heat balance is performed at each surface which includes incident
solar and long-wave radiation. There is no report variable with such a value.
Surfaces interact with the zone air heat balance by convection. The ultimate
load from the surfaces is (SurfaceInsideTemperature - ZoneAir Temperature) *
SurfaceArea * SurfaceInsideConvectionCoefficient, but this includes the solar
gains and radiant internal gains which are absorbed by the surfaces. The best
way to approximate the contribution from the envelope is to take the total load
and subtract off the gains from windows, internal loads, infiltration, and
ventilation. The remainder will approximate the impact of the envelope.
On 1 Mar 2005, at 12:40, mohammed khaylani wrote:
> dear sirs
> how can i calculate the total energy flowed into the zone (Q total= Q wall + Q
> windows + Q roof) if it is possible to guide me how to calculate it thank u
> mohammed samier
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Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
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