There is another way to control the cell temperature using the zone thermostat and the IdealLoadsAirSystem.
You can model the two zones with IdealLoadsAirSystem, and set the two zones with two different heating or cooling set point schedules at one hour interval using the measured interior room temperature. You can then compare the wall temperature by measurement and by simulation. Dr. LI. To: EnergyPlus_Support@xxxxxxxxxxxxxxx From: mohammadkheradmand@xxxxxxxxx Date: Wed, 14 Mar 2012 03:28:29 -0700 Subject: Re: [EnergyPlus_Support] define schedule compact for infiltration to reach convergence results Hello Dr. Li, Thanks again for wide spread information, In my case,we did experimental tests that in detail: A test cell which created a wall inside it we put sensors in two parts(north and south ambient part of cell) for measuring temperate changes and i try to simulate it by E+(attached pictures). when i put infiltration such as .idf file i can obtain good results in simulation,but i am not sure that is correct or not ...because infiltration can be exist in real. could you please put comment for me? how can
i evaluate my simulation. regards From: YuanLu Li <yli006@xxxxxxxxxxx> To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx> Sent: Tuesday, March 13, 2012 11:47 PM Subject: RE: [EnergyPlus_Support] define schedule compact for infiltration to reach convergence results
There is no problem with your IDF, except that you do not have DesignDay sizing.
The air infiltration rates to the zones were very high, 0.5 to 3.5 ACH. You can add the followings to display them. ============================ Output:Variable,*,Zone Mean Air Temperature,Timestep; Output:Variable,*,Outdoor dry bulb,Timestep; Output:Variable,*,Schedule Value,Timestep; Output:Variable,*,Zone Infiltration Air Change Rate,Timestep; ============================== Output:Table:TimeBins, *, !- Key Value Zone Mean Air Temperature, !- Variable Name , !- Interval Start , !- Interval Size 20, !- Interval Count , !- Schedule Name Temperature; !- Variable Type ============================ I do not know what this is for and was not simulated. Dr. Li To: EnergyPlus_Support@xxxxxxxxxxxxxxx From: mohammadkheradmand@xxxxxxxxx Date: Tue, 13 Mar 2012 10:31:59 -0700 Subject: [EnergyPlus_Support] define schedule compact for infiltration to reach convergence results Hello, Could you please explain to me this point in schedule compact: Field: Value Finally, the value field is the schedule value for the specified time interval. what is meaningful of it? and is it true that i did in .idf file till now? regards, From: saleh saadi <salehsnjsaadi404@xxxxxxxxx> To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx> Sent: Thursday, March 8, 2012 7:33 PM Subject: Re: [EnergyPlus_Support] what can i do for convergence the result ? Does the simulation underestimate or overestimate your experimental results?
You might need to consider the infiltration in your model. try to use simple convective heat transfer coefficient algorithm. Use real weather data measured at site. what is the uncertainty in your measurements equipment. ? your results need to be within 1 deg difference. (3-4) degree difference is large. regards, From: Mohammad Kheradmand <mohammadkheradmand@xxxxxxxxx> To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx> Sent: Thursday, March 8, 2012 11:06 AM Subject: [EnergyPlus_Support] what can i do for convergence the result ? I simulate my model for coldest and hottest a day of August, for comparing results between experimental and simulation results, i got reasonable result for hottest day(almost 4-5 degree differences ), but for coldest day i have difference almost 10-12 degree ...what is my problem? regards
__._,_.___ 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 __,_._,___ |