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People Sensible Heat Addition Using Design Builder and Energy Plus [closed]

asked 2022-06-08 09:37:37 -0600

updated 2022-06-09 08:46:43 -0600

Dear Sir

I am trying to compare the energy consumption patterns for the two cases as flowing.

Case 1: Central Ciller Plant with air cooled condenser. The cold water temperature at inlet of cooling coil is 7oC. The generic air loop set point is 16 oC. While the zone set point is 26 oC.

Case 2: Packaged Terminal Air Conditioner (PTAC) for cooling and one generic air loop with one electric cooling coil. The air loop cooling set point is 26 oC. The zone cooling set point is 26 oC.

In the both of the cases the occupancy density, scheduling, lighting density and scheduling, plug load density, scheduling are same. I am getting the people sensible heat addition different in both cases while the lighting and equipment sensible heat addition are same. Please explain why such results I am getting? Are the result are correct or wrong?

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Closed for the following reason duplicate question by Himanshu Saini
close date 2022-06-27 02:18:10.002336


@Himanshu Saini 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.

Aaron Boranian's avatar Aaron Boranian  ( 2022-06-08 16:32:25 -0600 )edit

I am currently using design builder software and IDF file imported through design builder is used in Energy Plus 9.2. So, i am working with both design builder and energy plus.

Himanshu Saini's avatar Himanshu Saini  ( 2022-06-08 22:47:07 -0600 )edit

Please clarify what you mean by "people sensible heat addition". Where do you see those values?

Jim Dirkes's avatar Jim Dirkes  ( 2022-06-09 05:03:11 -0600 )edit

In the .html result file "Sensible heat gain summary" table I found this column.

Himanshu Saini's avatar Himanshu Saini  ( 2022-06-09 11:22:56 -0600 )edit

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answered 2022-06-10 09:09:33 -0600

Jim Dirkes's avatar

Thanks for that. It would be even more helpful to share the exact values (or files) and which values seem inappropriate. Some of these values should be identical between models, but I think some will vary depending on the responsiveness of the HVAC system. Your HVAC systems are very different, so that may be a factor which affects your results.

ps, Kudos for examining your results carefully!

pps, The DesignBuilder Data Grid view is very helpful to confirm that all of your inputs are as you "think" they should be. With thousands of inputs, it's easy to miss the fact that some are not as you intend.

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Asked: 2022-06-08 09:35:34 -0600

Seen: 355 times

Last updated: Jun 10 '22