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Figure 6-6 7/16" oriented strand board batt insulation 3/4" foil faced foam insulation 1/2" PEX-AL-PEX tubing, 8" spacing 6" aluminum heat transfer plates, 8" spacing 1/2" drywall q=0.71×(Twa −Troom) Thus, if the radiant wall panel operates with an average water temperature of 110oF in a room with 70oF air temperature, each square foot of heated wall would release about 0.8 x (110 - 70) = 32 Btu/hr/ft2. RADIANT CEILING PANELS Another possibility is a radiant ceiling panel using the same materials and construction methods as the radiant wall panel. Figure 6-6 shows a cross section of this construction. Figure 6-7 shows an example of a radiant ceiling under construction. In this construction, the 1/2” PEX-AL-PEX tubes are spaced 8 inches apart. The plates are 5 inches wide. The Figure 6-7 life of the building. They are also ideal surfaces for radiant cooling using chilled water supplied from an air-to-water heat pump. However, when radiant cooling is 3/4-inch foil-faced polyisocyanurate foam insulation strips q=k(Twa −Troom)=15=k(115−70) are “held back” near the U-bends in the tubing. A 3/4- inch thick furring board runs adjace1n5t to the upper plate of k = = 0.333 the partition. This assembly will be covered with 1/2-inch 115−70 drywall. 2.5-inch long drywall screws will be installed halfway between adjacent tubes and spaced 12 inches apart in the direction parallel with the tubes. q=0.8×(T −T ) The rate of heat emission to the room can be estimated using Formula 6-3: Formula 6-3: where: q = heat output of ceiling panel (Btu/hr/ ft2) T = averat(gQe water−teqmpe)rature in wa V = heat source load panel (oF) Troom = room air temperature (oF) 500(ΔT) Heated ceilings have the advantage wa room of not beingt Qcovered −oqr block1e0d 4b8y000 − 2000 ()() V = heat source load coverings or furniture, and thus, are likely = 500(ΔT) 500(120−100) to retain good performance over the used, it is critical to maintain the chilled water temperature above the dewpoint COPave = ( ) of the interior air. kwhr used × 3413 More information on radiant cooling is available in idronics #13. PANEL RADIATORS Generously sized panel radiators can also provide good performance when used as part of a hydronic heat pump system. The suggested guideline is to Btu delivered 49PDF Image | Heat Pump Systems 2020
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