New Member
Posts: 1
Registered: ‎10-03-2009
Message 1 of 4 (976 Views)

How to find / calculate Alt Solar Gain (Ligthwt)

976 Views, 3 Replies
10-03-2009 06:08 AM
The Alt Solar Gain (Ligthwt) has major influence on the temperature distribution, Sol-air and direct solar gain values and in fact so imported that failure to use the right values lead to incorrect results.
The preset windows types which are defined in Ecotect are totally outdated and one need to set up more up to date low energy windows. But without the right Alt solar gain values it’s impossible. I know that those values can be found in CIBSE Guide A (if you Google it, ONE topic pops up, referring to with a useless answer and reference to this CIBSE Guide) But I not know this CIBSE and a quick search in my university library database gave no results.
Is it possible to calculate / find those Alt Solar Gain Values in a prober way? So one actual can use Ecotect for something.
Active Member
Posts: 7
Registered: ‎10-20-2009
Message 2 of 4 (976 Views)

Re: How to find / calculate Alt Solar Gain (Ligthwt)

10-20-2009 04:33 AM in reply to: vicivici2

Understand you problem and wish that i could help. I am having the same kind of problems. I am trying to evaluate on the result from Ecotect but is it impossible to make any kind of evaluation without this value!!!!

Active Member
Posts: 7
Registered: ‎01-02-2012
Message 3 of 4 (605 Views)

Re: How to find / calculate Alt Solar Gain (Ligthwt)

01-02-2012 12:27 PM in reply to: nielsthuesen

Hi the truth is out there :-).. écotect is actually using a dynamic simulation that uses a value for a building with ligth and heay materials Ecotect chooses one of the values depending on the responsfactor.


To cal culate see here I actually made a excel sheet for values in Ecotect. But you can see the formula here.. Its really the key for having the rigth temperature cal


I would like to eksplain it in more detail send me an email..



New Member
Posts: 1
Registered: ‎01-31-2012
Message 4 of 4 (577 Views)

Re: How to find / calculate Alt Solar Gain (Ligthwt)

01-31-2012 08:02 AM in reply to: vicivici2

HI nielsthuesen,

but where i can find the SWSC and LWSC factor in the equation of the tabel thath you linked??




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