Re: [EnergyPlus_Support] ceiling, adiabatic surface or not?

[teklay Weldeabzgi <teklay1979@xxxxxxxxx>]

you can take ceilings as an adiabatic if you set the
indoor tempereture of the space above and below the
ceiling is the same. otherwise you should cnsider heat
transfer through ceilings if the temperature of the
storise are differrent.

 in short you can take surfaces as adiabatic if the
surface is in one zone, else take the surface as heat
transfer surface if it separates two different thermal
zones.
--- pizzaalan <pizzaalan@xxxxxxxxx> wrote:
> Thank you very much for those who helped me before. 
> 
> I simulated 3 story building without adding any HVAC
> system first. 
> If I set all ceilings between any two stories to
> adiabatic walls, 
> then mean air temperature of third floor is close to
> outside 
> environment temperature. Say outdoor temperatue is
> -21 C, then mean 
> air temperature of first level is 18 C, second level
> is -2 C, the 
> third level is -20 C.
> 
> If I add the heat transfer between each story by
> setting that each 
> ceiling's outside surface environment object is
> floor of its upper 
> level, then now outdoor temperatue is still -21 C, 
> mean air 
> temperature of first level is 15 C, second level is
> 9 C, the third 
> level is 5 C.
> 
> Should mean air temperature of each story be very
> close? Should I 
> view ceilling as an adiabatic surface or not? 
> 
> Thanks again.
> 
> Alan
> 
> 
> 
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