Re: [TRNSYS-users] Type 56 window fraction

[David BRADLEY <d.bradley@tess-inc.com>]

TRNBuild does not have a method for specifying a glazing fraction per orientation. Typically you would draw your windows in SketchUp along with the rest of the building's geometry.

I would hesitate to recommend a % glazing factor for a greenhouse; there are a lot of variables that come into play. In northern climate greenhouses for example, you often see an insulated or even earth bermed north wall and you have to balance the glazing area between getting enough light to the plants and not losing too much heat at night. In hot climate greenhouses then cooling is the bigger challenge and that might direct you towards a different amount of glazing.

When in doubt, test the simulation's sensitivity to the design variable. Try some simulations with a range of glazing fractions! 

kind regards,

 David

On 02/07/2022 04:01, Zeynep Özcan via TRNSYS-users wrote:

Dear Trnsys users,

I am working with a type 56 building model for a greenhouse, is there a specific ratio or a constant value for the fraction of windows in external walls (%) for each orientation? I do not have a specific window area value, so for example is 0.95 (%) suitable for greenhouse modelling? Do you have any suggestions? 

Kind regards,

Zeynep Ozcan

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David BRADLEY
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Thermal Energy System Specialists, LLC
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