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Radiant Systems: Mullions and Radiant Panels

Thermal energy embodied in chilled and heated water streams from the solar and biodiesel units is piped to office, meeting, and work spaces in the IW for cooling and heating.  This means of energy delivery is more effective and economic than circulating large streams of cooled or heated air.  Cooling/heating units must then be provided in the IW spaces to deliver cooling/heating and thus to provide thermal comfort for the occupants.

Many research studies have been done regarding the heat transfer model of windows, but no literature about modeling and performance evaluation of mullion heating and cooling has been found in open publication. Because the mullions are actually radiators and are so close to the window glazing, the heat transfer processes between the mullions and the window glazing, window frames, room surfaces and inside air are complicated. Understanding these principles is important for an accurate simulation of the radiant cooling and heating in the IW.

Figure 1. Radiant mullions in the IW

The overhead radiant panels are the other type of radiant device in the IW. This type of radiant panel is also called a free-hanging ceiling radiant panel. The overhead radiant panel can be used for both heating and cooling in the IW.

Figure 2. Radiant panels in the IW


Gary Gong – PhD