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Too high temperature

asked 2018-09-12 07:41:18 -0500

MAKOTO's avatar

updated 2019-03-05 06:56:07 -0500

dhollman's avatar

Hello, I'm Japanese student majoring in Architecture. I'm using EnergyPlus to calculate inside temperature and sensible cooling energy of model house that made by SketchUp in my own. I set materials, constructions, HVACs, internal gains( lights, electricity, people) and simulated, but some of inside temperature became too high. (Ex. outside temperature 26℃, inside temperature 52℃)

First, I thought it caused because I put wrong number to materials(conductivity, thickness or more), so I changed number and tried simulate again, but its results were still too high.

Could someone tell me possible causes that makes inside temperature relatively high than outside temperature?

P.S. I'm so sorry about using poor English to ask these Questions because I'm not native in English.

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Can you provide more detail on what you used for lights, electric equipment, and people, possible that they are introducing more heat than expected.

David Goldwasser's avatar David Goldwasser  ( 2018-09-12 12:38:33 -0500 )edit

Thank you very much for giving me comments.

My simulation details are below.

  • Lights: using schedule on/off
  • ZONE1,6 7.3W(lightning level)
  • ZONE2 99W
  • ZONE3 22.8W
  • ZONE4 15.1W
  • ZONE5 12W
  • ZONE7,8 49.5W
  • ZONE9 10.7W

  • People: using schedule on/off

  • ZONE7,8 2people, Activity level: 72(using schedule any number)
  • ZONE2 4 people, Activity level: 103

  • Electric equipment: using schedule on/off

  • ZONE1 354.5W(equipment level) -ZONE2 425W
  • ZONE3 44.5W,2120W
  • ZONE4 1196W,354.5W
  • ZONE7 458.5W

  • Hot water: using schedule on/off

  • ZONE4 4400W
MAKOTO's avatar MAKOTO  ( 2018-09-12 23:00:27 -0500 )edit

Do you have any infiltration or ventilation defined? If you have a very insulated box with no infiltration or ventilation, that could cause heat build up.

Julien Marrec's avatar Julien Marrec  ( 2018-09-13 03:31:18 -0500 )edit

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answered 2018-09-14 12:34:56 -0500

Avi's avatar

As @Julien Marrec commented if your building doesn't have any mechanical system to deal with the energy you gain inside your building it make sense that your building temperature will rise. Other factor might be sun radiation penetrating the space through the windows. As mentioned before you should set realistic air infiltration which might reduce the load inside your building.

Generally I would recommend on doing the following:

  1. Assign proper infiltration rates.
  2. Assign Heating and Cooling thermostat schedule for each zone (and maybe Humidistat if needed).
  3. Assign ideal load air system to the different zones.
  4. After running the model make sure the load for each zone make sense.
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Asked: 2018-09-12 07:41:18 -0500

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Last updated: Sep 14 '18