Karol, as always there is possibility to model it with Trnsys
J.
The basic idea is to model the “semi-outdoor space” as an “indoor space” and you have think about how the main thermal processes
are modelled:
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short-wave radiation (direct and diffuse)
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long-wave radiation
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convection
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humidity
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comfort For example: short-wave radiation (direct and diffuse)
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depending on the size and distribution of the holes you can use the so-c
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The direct distribution model is fine, for the diffuse radiation you need to check if the model
is adequate.
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…. Long-wave radiation
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What is the temperature of the “leaf roof” for long-wave radiation exchange within space?
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… Convection
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What input values do you have? Can a nodal model like TRNFlow solve this or do you need a CFD to
define the ventilation rates?
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…. Humidity
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Do you need to take into account the impact of vegetation with respect to humidity and cooling effects?
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…. The success really depends on your project and what the aim of the simulation. Dipl.-Ing.
Transsolar Energietechnik GmbH Curiestraße 2 70563
Transsolar: KlimaEngineering- Technologien für energieeffizientes Bauen und Nutzerkomfort in Gebäuden Geschäftsführer :Diplom-Ingenieur
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Steuernummer: 99073/00911,USt-IdNr.: DE 152272639 Von: TRNSYS-users [mailto: Dear Users and Developers, I would like to model the zone that envelope is ‘fully of holes’, it consists of only shading elements. Like space inside upper branches of a tree or in the forest.
So, there is no thermal insulation and air and heat can flow into and across zone by natural ventilation, but sun radiation is limited. I wonder if TRNSYS simulation (TRNBUILD+TRNFLOW) can be appropriate to model such objects (inside thermal comfort) or it is necessary to use CFD simulation. I think to prepare zone (maybe a few airnodes) with very low thermal resistance (or thermal properties of construction material, e.g. steel) and with a lot of cracks
in the walls, then to model shading elements using shading zones. Do you have some idea or some experience with such objects? Any comments, hints and tips are appreciated! Kind regards, Karol ------------------------------------------------ Karol Bandurski MSc. Institute
of Environmental Engineering www.put.poznan.pl/~karol.bandurski |