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Technical Problem in Changing the simulation tab output values by changing the input values of the location template in DesignBuilder

asked 2023-01-15 12:55:36 -0500

behmoonesi's avatar

updated 2023-01-16 09:46:30 -0500


I want to do energy modeling of my desired building in the DesignBuilder software. However, I encountered a major and serious problem in the software.

1- By changing the values of maximum and minimum temperature as well as wind speed, in the location template of the software, instead of applying the changes in the heating and cooling design tab, these changes are also applied in the simulation tab. That is, by changing the weather parameters in the location template, the cooling and heating load output values are also applied in the simulation tab, and this should not be the case.

2- By reducing the temperature and increasing the wind speed in the location template, the amount of heat consumption in winter decreases (in the simulation tab). And it is obvious that this amount should increase and the opposite happens in summer.

3 - The output values in the simulation tab should be affected by weather data (epw file) and not change by changing the values related to the location template.

I should say that I am using a HVAC system. Logically, the amount of heating consumption should increase with the increase of wind speed in winter, but this amount has decreased. and logically, no matter how much the software changes the size, the heat consumption must still increase. Please let me know if there are any settings to fix this problem. Because I check different systems in different conditions, these settings need to be implemented correctly.

Please help me to solve this problem.

Best Regards

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@behmoonesi what simulation tool are you using? Please mention it in the title or body of your post, as well as add a tag so that others can provide better help. Adding images to your post will help also allow others to provide better help.

Aaron Boranian's avatar Aaron Boranian  ( 2023-01-15 14:47:46 -0500 )edit

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answered 2023-01-17 11:05:56 -0500

Luís Filipe S.'s avatar

updated 2023-01-17 11:06:31 -0500

Hello @behmoonesi

Q1. This is working as expected. The annual simulation requires the SizingPeriod:DesignDay object and the inputs for this object are set in the Location tab. See example below:

image description

Q2. The change you are making will increase the heating system sizing but the heating consumption will depend of the weather hourly conditions (epw file), the space's heat balance, and the HVAC system capacity to meet the requirements. My suggestion is to check the hourly results for the heat balance and system loads to have a better understanding of the model. One question for you, does the heating demand remains the same in both your case studies?

Q3. I disagree with you as this is not as linear as you think. If you have an undersized HVAC system that operates based on performance curves then the equipment might be at maximum operating capacity and consequently less efficient and with higher energy consumption.

Another question, is the indoor setpoint temperatures being met in both cases? If not, then there might be an issue with the HVAC system.

One final suggestion is to check for warnings and errors in the eplusout.err file that might indicate issues with your HVAC system.

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Asked: 2023-01-15 12:55:36 -0500

Seen: 104 times

Last updated: Jan 17 '23