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

Sorry, I forgot my next question...

When there are differences between DRYCOLD.TMY and DRYCOLD.EPW, then when I simulate CASE 600, it means I compare the same case but different weather data?
If yes, I conclude that this difference in weather data is one of the factor that make my results different from the reference (what's EP developers have been done/provided in the literature)

Thanks again,
Rahmi

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "rahmiandarini" <rahmiandarini@...> wrote:
>
> 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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