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Do I have to put an irrigation system for green roof?

asked 2016-06-06 09:59:13 -0600

dana94_08 gravatar image

updated 2017-05-04 06:11:54 -0600

I am modelling a green roof in OpenStudio (I put the properties of each material constructions) but the results are not logical. I'm wondering if it maybe because I don´t put anything of irrigation.

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What roof construction are you using?

Adam Hilton gravatar image Adam Hilton  ( 2016-06-07 07:45:37 -0600 )edit

Plants, Soil, drainage layer, polypropylene layer, drainage layer, roof.

Im putting the materials constructions in that order.

dana94_08 gravatar image dana94_08  ( 2016-06-07 08:11:43 -0600 )edit

Why do you think the results aren't logical?

Adam Hilton gravatar image Adam Hilton  ( 2016-06-07 08:26:29 -0600 )edit

Because the results say the cooling load of the third floor doesn't change. It goes to 1,98 ton to 1,97 ton or less.

dana94_08 gravatar image dana94_08  ( 2016-06-07 08:46:12 -0600 )edit

Ya, I can't speak to the thermal characteristics you're using for your materials, but with your current setup I think the main things you're not accounting for (and you can't in explicitly in OS to my knowledge) is the evaporative heat loss and your change in thermal mass when you go from saturated to dry soil. Did the object I mentioned in my answer help?

Adam Hilton gravatar image Adam Hilton  ( 2016-06-07 09:10:50 -0600 )edit

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answered 2016-06-07 08:33:40 -0600

Adam Hilton gravatar image

EnergyPlus has a Material:RoofVegetation object that you should look into. I believe that it captures the effective PC properties from wet to dry soil. You'll have to write a measure to use this in OpenStudio. I don't know much about modeling green roofs, but that object looks fairly convincing and easy to use.

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Asked: 2016-06-06 09:59:13 -0600

Seen: 321 times

Last updated: Jun 07 '16