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Re: [EnergyPlus_Support] Total Daylight Factor

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Total Daylight Factor
From: Vaibhav Jain <vaibhav.energyarchitect@xxxxxxxxx>
Date: Thu, 16 Aug 2012 16:19:00 +0200
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I have not used E+ for daylight, but I am surprised to hear Daylight Factor "from window" !?! DF is usually calculated on horizontal (not vertical exterior window) task-planes. Even if we want it to be calculated on vertical surfaces then it should be internal surfaces not exterior window. It could be a percentage of total DF from individual windows, if it would make any sense. Anyways would love to hear some new insight about E+ daylight calculation! Sorry its not the answer to your query.

Vaibhav

On 16 August 2012 15:42, fokus55555 <michael.dahl.knudsen@xxxxxxxxx> wrote:

Hello,

I have two questions concerning daylight factors.
Daylight factors are reported in the .eio file for each window. If I want the total daylight factor can I then simply add the contributions from all the windows?
Are the overcast sky daylight factors calculated for a CIE overcast sky?

Best regards
Michael

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References:
- [EnergyPlus_Support] Total Daylight Factor
  - From: fokus55555

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