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Dear Knut, I´m not quite sure about the internal shading in TRNSYS, but in
my understanding your description is quite reasonable. Outside shading reflects
the radiation and thus keeps the radiation heat flux outside of your building.
Internal shading allows the radiation heat flux to enter the building and is “trapped”
between window and internal shading, which is heated. From the shading heat is transferred
by convection into the zone. Hope this helps. Best regards, Christian Von:
knut.erik.enerstvedt@niva.no [mailto:knut.erik.enerstvedt@niva.no] Hello all, I'm using Type 56 to develop a model of a
greenhouse which has controllable inside screens to reduce incoming and
outgoing radiation. I have used the "internal shading factor" of the
windows with an input variable to achieve this, since the screens are actually
on the inside of
the greenhouse. However, the internal shading device does not have quite the
effect I expected. It does not seem to reduce solar radiation hitting the
zone, so that temperatures rise very high on warm and sunny days. It does
however seem to reduce temperature loss at night, but this could be due to the
additional thermal resistance. By testing the "external shading
factor" instead, I found that this device has the effect I want, blocking
out radiation and keeping temperatures down on hot days. Can someone please
tell me if I have misunderstood the concept of internal shading? Does it not
prevent outside solar radiation from hitting the zone after passing through the
windows? Best regards, Knut Erik Enerstvedt
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