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[EnergyPlus_Support] Re: Heating degree days and cooling degree days

OK Drury,

Thanks a lot for this answer.
I need more clarification, the DRYCOLD.TMY is provided also by ASHRAE, but why they put different 'base'? (18.3°C and 10°C)

Thanks
Rahmi

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Crawley, Drury" <Drury.Crawley@...> wrote:
>
> ASHRAE Standard 90.1 uses a base of 10C for cooling degree days.  That is often the point at which a commercial building requires some sort of cooling because of internal loads such as computers or other equipment.  This cooling can be either by natural means -- natural ventilation, economizer -- or by cooling equipment.
> 
> ________________________________
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of rahmiandarini
> Sent: Thursday, October 22, 2009 4:42 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Re: Heating degree days and cooling degree days
> 
> 
>   
> 
> Yes, I know that.
> But, why, for cooling, EP uses 'base' of 10°C?
> Does it means that when the outside air temperature is 15°C, then cooling is required??
> 
> Thanks
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx <mailto:EnergyPlus_Support%40yahoogroups.com> , Don Shirey <shirey@> wrote:
> >
> > Notice that the "base" is different (18.3C vs 18C vs 10C).
> > 
> > 
> > rahmiandarini wrote:
> > > Hi,
> > >
> > > I have question regarding weather data of DRYCOLD.TMY, provided for simulation of case 600, ANSI/ASHRAE Standard 140-2004.
> > > I have converted the weather so that i can use the simulation in DesignBuilder & EnergyPlus.
> > > When I checked the documentatio of ANSI/ASHRAE Standard, it is mentioned :
> > > Heating degree-days (Base 18.3°C) : 3636.2°C - days
> > > Cooling degree-days (Base 18.3°C) : 487.1°C - days
> > >
> > > and in the DesignBuilder
> > >
> > > Heating degree-days (Base 18°C) : 3379.2°C - days
> > > Cooling degree-days (Base 10°C) : 1446°C - days
> > >
> > > and my question is that, what does it means, and why those values are difference as they're originally from the same data.
> > >
> > > Thanks,
> > > Rahmi
> > >
> >
>




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