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Re: [EnergyPlus_Support] Thermal mass

For thermal mass to be effective in offsetting HVAC operation, the mass must be cooling (heated) to below (above) the zone temperature so that energy is stored in the mass. This means you must undershoot (overshoot) the zone temperature set point before you turn off the system.

On 10/9/2013 11:34 AM, yasin khan wrote:
Actually sir i want to estimate the energy saving by using thermal mass, So I shut off my system 2 to 3 hour before it's schedule. If there is thermal mass effect in energyplus, then my zone temperature is maintain around set point, so cooling energy not required in last 2 or 3 hour and save the energy. this is what i am thinking but its not happening in modeling. So plz tell mo how can i do it ?

On Wednesday, 9 October 2013 8:54 PM, "josep.sole@xxxxxxxxxxx" <josep.sole@xxxxxxxxxxx> wrote:
You can run your model using IdeaLoad system controlled by a constant (or variable) thermostat and after compare District Heating and Cooling in both cases
According my experience differences are quite small.
Josep Solé
URSA Insulation S.A
Sustainibility & Technical Manager 
Móvil +34 606 42 32 14
P URALITA / URSA se compromete con el ahorro de energía. Antes de imprimir este mensaje asegúrese de que es necesario.
De: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] En nombre de yasin khan
Enviado el: miércoles, 09 de octubre de 2013 17:17
Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
Asunto: [EnergyPlus_Support] Thermal mass
I want to find out the effect of Thermal mass, so i model  two type of different wall having almost same U-value but different heat capacity
( density X specific heat ) and simulate. But the profile of zone temperature for 24 hour are same. So how can i model the thermal mass effect ?

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