Dan,
The window heat gain output gives you the amount of energy from exterior windows into the zone. Reporting this to the window side of the zone served by the facade may give you the amount of solar radiation transmitted directly from outside into the zone. In other words, the radiation that enters the zone, directly transmitted through the exterior windows of the facade, even though they are in a adjacent zone. This output should be specific for an exterior window though, so make sure you are reporting the right window. If it's correct, try and compare the results with "beam solar transmitted through interior window".
Pedro
On 17-10-2011 8:10, dan_grunbaum wrote:
Hi there,
We are simulating a ventilated double skin facade by creating a cavity zone 200 mm deep adjacent to the occupied perimeter) zone. The external surface of the cavity is glazed and the internal surface separating the cavity from the perimeter zone is also glazed and there is an operable blind within the cavity.
We are attempting to do a heat balance to ensure we understand the benefit of ventilating the cavity with external air. We have started looking at the situation where there is no blind within the cavity. To determine the heat flow from the cavity zone to the perimeter zone we have been looking at the "Window Heat Gain" variable for the internal glazed surface separating the two zones. This value appears very low when compared to the sum of "Beam Solar Transmitted through Interior Window", "Zone Diff Solar from Exterior Windows", and "Surface Int Convection Heat Rate" for the internal window. Does the "Window Heat Gain" variable represent the total heat gain through internal windows or are we misinterpreting?
In addition there does not seem to be variables for the long wave radiant transfer through the internal glazed surface or the conductive gain through the frame. There are the "Window Net Infrared Heat Gain/Loss from Glazing to Zone" and the "Window Heat Gain from Frame and Divider to Zone" variables for the external glazing, however there do not appear to be corresponding values for internal glazed elements. Is there a way of establishing what these variables are for the internal glazing?
Regards,
Dan
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