[EnergyPlus_Support] Re: Calculation method of heat loss due to mechanical ventilation

["Zhang Xiangjing" <geshen516@xxxxxxxxx>]

Dear Robin

You can look at the heat balance model of air mass inside a zone.
The mechanical ventilation part should be one item inside that equation.

Regards
ZHANG Xiangjing

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "rgen1202" <robin.genoud@...> wrote:
>
> Hello,
> 
> I can't find in the engineering reference document the formula used to calcul the heat loss due to mechanichal ventilation. In fact, I have a constant mechanical ventilation rate set and I can't calcul on my own the same heat transfer as retourned by EnergyPLus. Indeed, I started by calculating the outdoor air density with the dry temperature, the atmospheric pressure and the relative moisture, but I already find different values. I used the magnus formula for the vapor saturation pressure, but my values are approximatively 0.1 kg/m3 higher.
> 
> Is there a file in which I could find the formula used by EnergyPlus for air density calculation and heat transfert due to mechanical ventilation and infiltration (I assume it requires the air heat capacity too).
> 
> Thanks in advance.
> 
> Best regards.
> 
> Robin Genoud
>




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