[TRNSYS-users] Reflective insulation in TRNSYS

[Xandrika <xandrika77@gmail.com>]

Dear TRNSYS experts,

I am trying to represent radiant heat reflective insulation such as alumimium foil for roofs (http://supreme.co.in/protectivepack/insureflector-underdeck-insulation.html) in TRNBUILD.

This kind of insulation has a low absorptance and low emittance and, thus, reduces radiant heat transfer. It is combined with an airspace. My roof layer are as followed (inside to outside):

Option 1:

1. 1/2" flattened bamboo on rafters
2. Radiative aluminium foil on 2" Styrofoam 
3. 2" air layer (ventilated)
4. CGI roof on timber structure

Option 2:

1. 1/2" flattened bamboo on rafters
2. Radiative aluminium foil/sheet
3. 2" air layer (ventilated)
4. CGI roof on timber structure

However, I cannot put absorptance and emittance for each layer. So, I am not sure how I can represent this material in TRNBUILD?

Could you, please, give me any advice? Thanks a lot.

Warm regards,

Susanne

__________________________________________________________
Susanne Bodach
PhD. Candidate
Technical University Munich

Institute of Energy Efficient and Sustainable Design and Building

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