[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] RE: Thermal mass





You should try using very extreme conditions. 

I used periodic conditions in the weather file (and there was no internal loads, no ventilation or infiltration) and the period was equal to 24 hours.

The internal space was conditioned and I got the following results for different materials in the external wall composition:  http://img593.imageshack.us/img593/109/6khg.jpg

With the finite different method I got similar results. 

Best Regards




---In energyplus_support@xxxxxxxxxxxxxxx, <RRaustad@...> wrote:

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@..." <josep.sole@...> 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
 cid:image002.gif@01CB9782.91A51950
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
 
 
Sir
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 ?



-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 50 Years


__._,_.___


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.




Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___