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Energyplus multi zone HVAC system

asked 2016-07-27 18:06:27 -0500

Rafa-el-guerra's avatar

updated 2017-05-06 08:30:37 -0500

I am a student currently developing my architectural dissertation. I have encountered a problem I have not been able to solve. I need to set up a combined, constant air volume system, with a fan coil system for a three story building. My dissertation is about optimising the glazing ratio. I have used several approaches to do so, specially using the example files from energy plus.

First I tried setting up the HVAC exactly as the example file, which worked perfectly, however as soon as I added more zones the error appeared and increased the zones being left with a thermal zone = to zero. I am currently trying to set up the System for 34 thermal zones, 26 with CAF and 8 with Fan coil HVAC. I have tried using more than 2 AHU units to serve the multiple zones, as well as changing the Heating and cooling set points and starting over but the issue persists. I have to say this is my first big project using energyplus and my understanding of HVAC system is rather limited. I have used the templates with the hope it would simplify the process but I haven't yet succeeded. I have uploaded the Error log as well as upload the link to my idf file.

I appreciate any help you might provide.

Error log 1

Error log 2

IDF File

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Please always tag your question with the simulation software you're using if appropriate and refrain from creating new tags (when you type a tag, the autocomplete shows the existing tags, just use these)

Julien Marrec's avatar Julien Marrec  ( 2016-07-28 04:05:35 -0500 )edit

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answered 2016-09-29 21:22:13 -0500

It's been a while since you posted this, so maybe you figured it out already. But for the record, there are several things contributing to no heating load in many zones.

  1. GroundTemperatures are all 22C. This is quite warm.
  2. There is no infiltration.
  3. Lights and electric equipment are using normal weekday schedules for WinterDesignDay - suggest using the holiday day schedules for WinterDesignDay.
  4. Thermal Zone 10, for example, has no exterior surfaces, so I would not expect a design heating load for this zone.
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Asked: 2016-07-27 18:06:27 -0500

Seen: 1,044 times

Last updated: Sep 29 '16