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negative solar radiation

asked 2021-07-27 21:11:44 -0600

llfan_123 gravatar image

updated 2021-07-31 10:46:42 -0600

https://www.pveducation.org/pvcdrom/p...

According to this model and TMY3, solar radiation on a building wall facing south is sometimes negative. Is it reasonable?

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My result is for Fairbanks. Is it too special a place chosen? Or is it reasonable to have negative solar illumination?

llfan_123 gravatar image llfan_123  ( 2021-07-27 21:31:41 -0600 )edit

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answered 2021-07-28 08:37:59 -0600

lklawrie gravatar image

Are you actually seeing this in results of a run?


Linda

FIBPSA, FASHRAE http://climate.onebuilding.org - free repository of climate data for building simulation Climate.onebuilding is a FREE service not supported by any outside organization or government agency.

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yes i saw it when running on fairbanks data

llfan_123 gravatar image llfan_123  ( 2021-07-28 10:09:48 -0600 )edit

Attach your IDF file? Did you use the TMY3 from energyplus.net or from climate.onebuilding.org?


Linda

FIBPSA, FASHRAE http://climate.onebuilding.org - free repository of climate data for building simulation Climate.onebuilding is a FREE service not supported by any outside organization or government agency.

lklawrie gravatar image lklawrie  ( 2021-07-28 10:22:05 -0600 )edit

I used the formula from this, not energyplus: https://www.pveducation.org/pvcdrom/p... I used TMY3 data.

llfan_123 gravatar image llfan_123  ( 2021-07-28 10:30:34 -0600 )edit

Then I don't think I can help you. Not sure who wrote this formula, etc, etc.


Linda

FIBPSA, FASHRAE http://climate.onebuilding.org - free repository of climate data for building simulation Climate.onebuilding is a FREE service not supported by any outside organization or government agency.

lklawrie gravatar image lklawrie  ( 2021-07-28 10:36:40 -0600 )edit

what would be the standard way of calculating the solar radiation received by a wall?

llfan_123 gravatar image llfan_123  ( 2021-07-28 10:48:01 -0600 )edit

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Asked: 2021-07-27 21:11:44 -0600

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Last updated: Jul 28