Document remLGaE0mrOjYQ8bqbbyDjN4r

440 CHAPTER 30 1960 Guide Step 9. Design Panel Area Divide the room heat loss found in Step 1 by the design panel output found io Step 8. P.001: A B C Design Panel Area (A,) Sq ft 132 (Unchanged from Step 2) 77 242 Step 10. Total Panel Output Add the heat flow upward (g) to the design panel output (?<) and multiply by the design panel area to obtain the total panel output. If the design panel output is different from the panel output (94) used in Steps 3 and 4, the beat flow upward (?) should be redetermined. Room 9- q* 9- + V a. Total Panel Output d,(q, + 94) Btu/hr A 12.5 47.7 B 9-5t 32.5 C 5.5t 33.0 t redetermined 60.2 42.0 38.5 132 77 242 7946 3234 9317 Step II. Fluid Circuit Design the fluid circuit (panel piping and mains) for a tem perature drop of 10 to 20 F deg between the water Inlet and outlet of the panel (see Chapter 28, Hot Water Heating Sys tems). Step It. Boiler Size Sire the boiler according to method contained in Chapter 35, Heating Boilers, Furnaces, and Space Heaters. The net Btu rating of the boiler should equal or exceed the total out put of all panels plus any other loads on the boiler. Procedure for Metal Ceiling Panels1* Follow the procedure for Hot Water Plaster Ceiling Panels. Procedure for Concrete Ceiling Panels" 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 directions in amounts determined by the thermal resistances and the temperature differences in the two directions. The effect of both outputs on heating requirements of the spaces and the comfort of the occupants should alwayB 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 assumptions regarding the upward heat flow from plaster panels are not valid for concrete panels. The necessary modification of the plaster ceiling panel procedure is as follows: Step 1. Beat Lost Follow the procedure for Plaster Ceiling Panels, Step 1. Step t. Required Panel Output Follow the procedure for Plaster Ceiling Panels, Step 2. Table 2 .... Thermal Resistance of Concrete Ceiling Panels Panel Construction /mooNSI________ Tft* [\ COVt""'" Thereto! Resilience (F deg)[*q ft) (hr) per Btu Hoot Row Ratio q*/qe In. 0 0.5* 1.0* wp down p down tfp down 6-in. Concrete Sob--I4i cow r- 14 r. re r. re (nom.) nonferrous tube 9 3.6 0.30 0.9 0.35 0.7 0.45 12 5.1 0.35 1.1 0.45 0.9 0.55 }-in. (nom.) ferrous pipe or H'iu- (nom.) nonferrous tube 9 2.6 0.25 0.7 0.30 0.6 0.35 12 4.C 0.3C 0.9 0.40 0.8 0.50 {-m. (nom.) ferrous pipe or 1-in. (nom.) nonferrous tube 9 2.1 0.20 0.6 0.25 0.6 0.30 12 3.3 0.3C 0.8 0.35 0.7 0.40 15 4.5 0.35 1.0 0.45 0.8 0.55 1-in. (nom.) ferrous pipe 9 1.6 0.20 0.5 0.25 0.5 0.25 12 2.6 0.25 0.7 0.30 0.6 0.35 15 3.6 0.30 0.9 0.40 0.7 0.45 -oa Concrete Slah~l-ia. Cow (nom.) nonferrous tube 9 3.6 0.30 1.0 0.35 0.8 0.40 12 5.2 0.35 1.2 0.45 1.0 0.55 )-in. (nom.) ferrous pipe or $-in. (nom.) nonferrous tube 9 2.9 0.25 0.9 0.30 0.8 0.35 12 4.0 0.30 1-1 0.40 0.9 0.45 M-in. (nom.) ferrous pipe or 1-in. (nom.) nonferrous tube 9 2.2 0.20 0.8 0.30 0.7 0.30 12 3.3 0.30 1.0 0.35 0.8 0.40 15 4.3 0.35 1.1 0.40 0.9 0.50 1-in. (nom.) ferrous pipe 9 1.7 0.20 0.7 0.25 0.7 0.25 12 2.7 0.25 0.9 0-30 0.8 0.35 15 3.7 0.30 1.0 0.40 0.9 0.45 Any oefliag penel Also acts e * flare toad to the extent of its upward heat flow. II the upward heat flow is bi^h and the spare above is occupied, cheek floor surface temperature (re possible foot diacreafret (see Reference 7). Also check effect ret heating requirements of the space above- It is Dot good practice to have the major portion of the upper room's totting requirement* supplied by the upward heat flow of a eeilinc panel below. Step S. Panel Surface Temperature Follow the procedure for Plaster Ceiling Panels, Step 3. Step 4 Upward Heat Plow Estimate a. If the upper surface of the slab is exposed to form a floor, find the heat flow upward from Fig. 16, using the panel surface temperature (Ip) found in Step 3, and the air tempera ture of the space above. b. If the upper surface of the slab is not exposed, use tbe equation: 9. - C,(4 - tp) (10) i Panel Heating Table 3____Thermal Resistance of Bare Concrete Floor Panels itmnoel ftedstonce \f deg)t*q ft)\M/Btv Pmd Construction Heat Row Retie qu/qe or q%/qe. 1 3 5 10 4-in. Concrete Sot--2-in. Cow op down Op down up down up down r,, re. re. rw re* re* H-in. (nom.) nonferrous tube 9 0.57 0.52 0.46 0.84 0.43 1.17 0.42 1.97 12 0.73 0.68 0.58 1.16 0.54 1.65 0.51 2.86 H-in. (nom.) ferrous pipe or &-in. (nom.) nonferrous tube 9 0.49 0.42 0.41 0.66 0.39 0.90 0.38 1.80 12 0.63 0.55 0.50 0.93 0.4S 1.30 0.46 2.35 04b. Concrete Stab--2-in. Coro, W-in. (nom.) nonferrous tube 9 0.59 0.70 0.47 1.05 0.45 1.39 0.43 2.25 12 0.78 0.90 0.60 1.40 0.56 1.97 0.54 3.21 Ji-in. (nom.) nonferrous tube 9 0.51 0.61 0.43 0.87 0.41 1.13 0.40 1.78 12 0.68 0.78 0.54 1.23 0.51 1.63 0.49 2.61 %-in. (nom.) 9 0.47 0.55 0.40 0.77 0.39 0.98 0.38 1.50 ferrous pipe 12 0.63 0.71 0.50 1.07 0.48 1.44 0.46 2.36 1-in. (nom.) nonferrous tube or 1-in. (nom.) fer rous pipe 12 0.59 0.66 0.48 0.98 0.46 1.30 0.45 2.11 15 0.73 0.83 0.57 1.21 0.54 1.73 0.51 2.74 Step S. Upward and Downward Panel Resistance Follow the procedure for Piaster Panels, Step 5, using Table 2 to find both resistances (r, and r<). Step 8. Mean Water Temperature and Upward Beat Plow a. Follow the procedure for Plaster Panels, Step 6.. b. Find the heat flow upward from the panel (9*) from Fig. 16. Add to the thermal resistance of the slab to upward heat flow (rM), the resistance to heat flow (rM) of any material between the upper surface of the Blab and tbe space above to obtain the resistance (r.) to be used in Fig. 16. Tbe mean water temperature ((*) found and tbe air temperature of the space above tbe panel are the other two factors to be used. Step 7. Design Mean Water Temperature Select the highest mean water temperature (tm) as the de sign mean water temperature (tem*). Step 8. Design Panel Output Follow tbe procedure for Plaster Panels, 8tep 8. Step 9. Design Panel Area Follow the procedure for Plaster Panels, Step 9. 441 Step 10. Total Panel Output Follow the procedure for Plaster Panels, Step 10. Step 11. Fluid Circuit Follow the procedure for Plaster Panels, Step II. Step IB. Boiler Size Follow the procedure for Plaster Panels, Step 12. Procedure for Plaster Wall Panels A design graph has not been prepared for wall panels but a design can be approximated using the equations of heat transfer from walls together with the thermal resistance properties of plaster railings from Table 2. Hie procedure for Plaster Ceiling Panels is used as a guide. Step 1. Beat Loss Follow tbe procedure for Plaster Ceiling Panels, Step 1. Step B. Required Panel Output Follow the procedure for Plaster Ceiling Panels, Step 2. Step S. Panel Surface Temperature Assume a trial panel surface temperature and determine the resulting heat output from Figs. 9 and 10 as explained in the accompanying section of the test. (Additional neat flow due to the infiltration can be estimated from Fig. 12, if de sired.) Assume successive trial panel surface temperatures until the temperature is found at which the combined heat transfer from the panel equals the output determined in Step 2. Step 4. Reverse-Side Heat Plow Follow the procedure for Plaster Ceiling Panels, Step 4. Step 8. Panel Resistance Follow the procedure for Plaster Ceiling Panels, Step 5. Step 8. Mean Water Temperature For the required panel output found in Step 2, the panel resistance found in Step 6, and the room air temperature, calculate the required mean water temperature as follows: + rsiqe) (U) Step 7. Design Mean Water Temperature Follow the procedure for Plaster Ceiling Panels, 8tep 7. Step 8. Design Panel Output From equations, Step 6, and Figs. 9 and 10 find the panel output for design mean water temperature tw by successive Step 9. Design Panel Area Follow the procedure for Plaster Ceiling Panels, Step 9. Step 10. Total Panel Output Follow tbe procedure for Plaster Ceiling Panels, Step 10. Step 11. Fluid Circuit Follow tbe procedure for Plaster Ceiling Panels, Step 11. Step IB. Boiler Size Follow the procedure for Plaster Ceiling Panels, Step 12. Procedure for Hot Water Concrete Floor Panels (Slab-On-Grade)" The procedure for designing & concrete floor panel (slabon-grade) will be illustrated by Example 2. Example B: Three rooms, A, B, and C, are to have a com mon water supply temperature; that is, they represent a single zone. They are to be maintained at 72 F air temperature J