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Re: [EnergyPlus_Support] Space heating demand. HELP



As I think about this....
Why is it a problem for the heating system to have a large peak upon startup? It seems that is exactly what occurs when the heating system starts and begins to transition the building from an unoccupied period with lower setpoint to an occupied period (and higher setpoint).

On Wed, Aug 2, 2017 at 6:43 AM, Giuseppina Buttitta giusybuttitta@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Thank you all for the reply,

I used your suggestions and I applied a schedule with a constant temperature as heating schedule of the design day. Peaks now are significantly reduced, however they are still there (see attached figure).
Do you have any idea about other possible causes? I also considered the heating sizing factor equal to 1.

Thanks again,
Giusi



On Tuesday, August 1, 2017 6:11 PM, "Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@yahoogroups.com> wrote:


 
Your autosizing settings will determine how large the equipment is depending on how fast they have to bring the zone to the required setpoint after they are turned on. Either ramp the setpoint or increase the pulldown time in the autosizing options.

Am 31.07.2017 2:34 nachm. schrieb "Giuseppina Buttitta giusybuttitta@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@yahoogroups.com>:
 
Hi all!
I have tried to model the energy consumption for heating of a dwelling heated by electric baseboards. All the installed electric baseboards are controlled by a thermostat.
However, the results I obtained look weird to me.
The heating energy request is not constant during the period but it has a really big peak when the heaters are turnud on and then the request is quite small during the rest of the day (see attached picture). It looks like the heaters are oversized for the dwellings.
I tried to check again my code several times but everything seems fine.
Do you have any idea what the problem could be?
I know it is a vague request, but probably it has already happened to some of you.

Thanks,
Giusi





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