EnergyPlus uses the heat balance method.  The Engineering Reference
(EnergyPlus\Documentation\EngineeringDoc.pdf) dicusses the simulation
methodology.

Mike

On 12 Oct 2002, at 2:22, gagamere wrote:

> I check results of heating load which you presented in your message.
> But the load is not similar yet. Please tell me more knowledges. and
> usally, how calculates heating load in Energy Plus ? Heat balence or
> another mothod ?
>
> Have a nice day..
>
>
> ------------------------------------------------------------------
> DESIGNDAY with constant temperature (Daily Temperature Range = 0), no
> solar (Sky Clearness=0), and no internal gains. You should be able to
> match the UAdeltaT calculation. Be sure to use the interior and
> exterior convection coefficients reported in the output.
>
> Mike Witte
>
>
> On 9 Oct 2002, at 8:17, gagamere wrote:
>
> >
> > I usually know that heating load is calculated as formula
> >
> > Q=U*A*(T_i - T_o)
> >
> > where, U=1/(R_o + R_i + R_c)
> >
> > R_o : outer convection heat resistance
> > R_i : inner convection heat resistance
> > R_c : conduction heat resistance in wall
> >
> > I review a result of heating rate using Energy Plus and another
> S/W.
> > But I know to differ results.
> >
> > So, I check the result of Energy Plus.
> >
> > First, I get a convective coeff in result.
> >
> > R_i = 1/ Surface Int Convection Coeff
> > R_o = 1/ Surface Ext Convection Coeff
> > R_c = thickness/Conductivity
> >
> > Second, I calculate a overall heat conductivit[U] and get heating
> > rating, Q.
> >
> > Then, I know a value calculated by hand is bigger than a value
> > calculated by Energy Plus.
> >
> > Please, tell me a reason.
>
>
>
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