Document KJbe3RDrN3ZNzBgM5n77QayzN

614 CHAPTER 23 1957 Guide Step 9. Design Panel Area Divide the room heat loss found in Step 1 by the design panel output found in Step 8. Room ;A B C Design Panel Area (Ap) Sq ft 132 (Unchanged from Step 2) 77 . .. 242 Step 10. Total Panel Output '. Add the heat flow upward (o,,) to the design panel output (gj) and multiply by the design panel area to obtain the total panel output. If the design panel output is different from the panel output (ga) used in Steps 3 and 4, the heat flow upward (g,,) should be redetermined. Room 9u Total Panel Output 9d ?a + Qd Ap Ap(g + gs) Btu/hr A 12.5 47.7 60.2 132 7946 B 9.5f 32.5 42. 77 3234 C 5.5t 33 38.5 242 9317 t redetermined. Step 11. Fluid Circuit Design the fluid circuit (panel piping and mains) for a temperature drop of 10 to 20 F deg between the water inlet and outlet of the panel (See Chapter 21 Hot Water Heating Systems). Step IS. Boiler Size Size the boiler according to method contained in Chapter 16 Heating Boilers, Furnaces, and Space Heaters. The net Btu rating of the boiler should equal or ex ceed the total output of all panels plus any other loads on the boiler. Procedure for Metal Ceiling Panels13 . Follow the procedure for Hot-Water Plaster Ceiling Panels. Procedure for Concrete Ceiling Panels13 Concrete ceiling panels are distinguished from concrete floor panels in intermediate floors by the position of the tubes in the concrete slabs (see Tables 2 and 3). Both types of panels have heat outputs in both direc tions in amounts determined by the thermal resistances and the temper ature differences in the two directions. The effect of both outputs on heating requirements of the spaces and the comfort of the occupants should always be considered. (See section on Procedure for Concrete Floor Panels--Intermediate Slab.) The procedure for hot-water plaster ceiling panels cannot be applied in its entirety to concrete ceiling panels because some of the simplifying as sumptions regarding the upward heat flow from plaster panels are not Panel Heating 615 Table 2. Thermal Resistance of Concrete Ceilinq Panels Panel Construction /HICKNESS f// k SPACING-*! YJ panel j ^ ^surface ^^ COVER"""'" Thermal Resistance (F deg)(hr)(sq ft per Btu) Spacing in. Heat Flow Ratio Ca/?d 0 0.5* 1.0 up down up down up down 6 in. Concrete Slab--1 in. cover H in. (nom.) non-ferrous tube Vs in. (nom.) ferrous pipe or ^ in. (nom ) non-ferrous tube in- (nom.) ferrous pipe or 1 in. (nom.) nonferrous tube 1 inch (nom.) ferrous pipe 8 in. Concrete Slab--1 in. cover 9 12 9 12 9 12 15 9 12 15 . fa* rd rB rd ra rd 3.6 5.1 0.30 0.35 0.9 1.1 0.35 0.45 0.7 0.9 0.45 0.55 2.6 4.0 0.25 0.30 0.7 0.9 0.30 0.40 0.6 0.8 0.35 0.50 2.1 3.3 4.5 0.20 0.30 0.35 0.6 0.8 1.0 0.25 0.35 0.45 0.6 0.7 0.8 0.30 0.40 0.55 1.6 2.6 0.20 0.25 .0.5 0.7 0.25 0.30 0.5 0.6 0.25 0.35' 3.6 0.30 0.9 0.40 0.7 0.45 -- H in. (nom.) non-ferrous tube H in. (nom.) ferrous pipe or H in. (nom.) non-ferrous tube ^ in. (nom.) ferrous pipe or 1 in. (nom.) non- lerrous tube 1 in. (nom.) ferrous pipe 9 12 9 12 9 12 15 9 12 15 3.6 5.2 0.30 0.35 1.0 1.2 0.35 0.45 0.8 1.0 0.40~ 0.55 2.9 4.0 0.25 0.30 0.9 1.1 0.30 0.40 0.8 0.9 0.35 0.45 2.2 0.20 0.8 0.30 0.7 0.30_ 3.3 0.30 1.0 0.35 0.8 0.40 4.3 0.35 1.1 0.40 0.9 0.50 1.7 0.20 0.7 0.25 0.7 0.25 2.7 0.25 3.7 . 0.30 0.9 1.0 0.30 0.40 0.8 0.9 0.35 0.45 . 1 Any ceiling panel also acta aa a floor panel-to the extent of its upward heat flow. If the upward heat flow is high and the space above is occupied, check floor surface temperature for possible foot discomfort (see Reference 7). Also check effect on heating requirements of the space above. It is not good practice to have the major portion of the upper room's heating requirements supplied by the upward neat flow of a ceiling Panel below. Danpl fnF "7* pane]s;, The necessary modification of the plaster ceiling panel procedure is as follows: - Step 1. Heat Loss Follow the procedure for Plaster Ceiling Panels, Step 1. Step 2. Required Panel Output Follow the procedure for Plaster Ceiling Panels, Step 2. Step S. Panel Surface Temperature Follow the procedure for Plaster Ceiling Panels, Step 3. Step Upward Heal Flow Estimate ?0 = C,(t,, - (p) 6. Upward and Downward Panel Resistance (10) sistances (t>he. parnodcerddu).re for Plaster Panels, Step 5, using Table 2 to find both re