Document omzR5Qm9QL59wGZ3GZ6kJBQYE

HEATING VENTILATING AIR CONDITIONING GUIDE 1944 (dollars) heat lost -i- 13,000 (Btu) X 2000 (lb) X 0.55 per year -- 0.804 X 181.6 (thousand B(etuffi)ci=en$c1y4) 6=.00S$. 0,804. The total cost of Table 3. Heat Loss from Bright Copper Pipe Given One Thin Coat of Clear Lacquer EXpreShtt^b PZj?UrJ>er linearf` P* degree Fahrenheit between the pipe and surrounding still air at 70 F PlPH (Inches) X i1x IX 2 32X. 3X 4 iX 5 6 8 Hot Wates (Typo E Copper Tube) Steam (Standard Pipe Size Pipe) 120 F I ISO F 180 F 210 F 227.1 F (5 Lb) 297.7 F (50 Lb) 337.9 F ' Temperature Difference 50F 0.240 0.320 0.390 0.470 0.540 0.690 0.840 0.960 1.100 1.241 1.480 1.700 2.200 80 F 0.265 0.356 0.437 0.537 0.612 0.762 0.937 1.025 1.250 1.400 1.685 1.936 2.500 110 F 0.282 0.373 0.463 0.554 0.645 0.818 0.991 1.135 1.318 1.480 1.790 2.052 2.630 . 140 F 0.307 0.414 0.507 0.614 0.714 0.892 1.085 1.270 1.442 1.556 1.965 2.272 2.854 1 157.1 F | 227.7 F 0.401 0.477 0.598 0.700 0.830, 1.005 1.178 1.400 1.580. 1.750 1.910 2.130 2.450 3.120 0.461 0.571 0.681 0.812 0.966 1.164 1.361 1.625 1.845 2.040 2.240 2.415 2.810 3.425 | 267.9 F 0.478 0.578 0.710 0.840 0.990 1.201 1.420 1.700 1.905 2.130 2.350 2.610 2.990 3.730 Table 4. Heat Loss from Horizontal Tarnished Copper Pipe Fxpressed in Btu per hour per linear foot per degree Fahrenheit between the pipe and surrounding sttU air at 70 F Nominal Fin &za (Inches) x X 1 IX ix 2 2X 3 m 4 *X 5 6 8 Hot Wateb (Type K Copper Tube) Steak (Standard Pipe Sire Pipe) 120 F 150 F 180 F 221100 F * 11 2(527L.1b)F 297.7 F (SO T.M i 337.9 F Tempsraturb Differences 50 F 0.250 0.340 0.440 0.500 0.580 0.730 0.880 1.040 1.180 1.460 1.600 1.840 2.400 80 F 0.287 0.381 0.475 0.559 0.656 0.825 1.000 1.175 1.350 1.500 1.812 2.125 2.685 110 F 0.300 0.409 0.509 0.618 0.710 0.890 1.091 1.272 1.454 1.635 1.980 2.270 2.910 140 F 0.321 0.429 0.536 0.622 0.750 0.957 1.143 1.343 1.535 1.715 2.071 2.430 3.110 157.1 F 0.433 0.533 0.636 0.764 0.904 1.101 1.305 1.560 1.750 1.941 2.131 2.387 2.740 3.310 . 227.7 F 0.500 0.543 0.746 0.878 1.053 1.273 1.490 1.800 2.020 2.240 2.465 2.770 3.210 4.050 267.9 F 0.530 0.654 0.803 0.934 1.120 1.364 1.605 1.940 2.170 2.430 2.650 2.990 3.440 4.370 CHAPTER 18. PIPE INSULATION HEAT LOSSES FROM INSULATED PIPES The conductivities of various materials used for insulating steam and hot water'systems are given in Table 8. They are given as functions of *f '''d Aiifor cnrfarp fPrn- ~' 1 Table 5. External Surface per Linear Foot of Pipe Nominal Pipe Sun (Inches) _ .1 Surface Area | (So Ft) I NominRatlm (Inches) 0.22 0.275 0.344 0.435 0.498 2 2X 3 3X 4 mm a 1 Nominal Surface Area | p,--, g^s (So Ft) 1 (Inches) 0.622 I 5 0.753 1 6 0.917 ! 8 1.047 I 10 1.178 I 12 Surface Abba (So Ft) 1.456 1.734 2.257 2.817 3.338 Table External Surface per Linear Foot of Copper 'rUBING Outside diameter X .* greater than nominal size Tubs Size (Inches) X iX ix IX Surface Area (So Ft) Tubs Size (Inches) 0.164 2 0.229 2X 0.295 3 0.360 I 3X 0.426 I 4 Surface Area 1 (So Ft) 1 0.556 I Tube Size (Inches) 5 0.687 0.818 0.949 1.080 I I I r 6 8 Surface Abba* (So Ft) 1.342 1.604 2.128 Table 7. Areas, of Flanged Fittings, Square Feet Nominal Pipe Size (Inches) 1 IixX 2 2X 3 3X 4 iX 5 6 8 10 12 Flanged Coupling 90 Dbg Ell Long Radius Rt.t. Teb Cross. Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy Standard Extra Heavy 0.320 0.383 0.477 0.672 0.841 0.945 1.122 1.344 1.474 1.622 1.82 2.41 3.43 4.41 0.438 0.510 0.727 0.848 1.107 1.484 1.644 1.914 2.04 2.18 2.78 3.77 5.20 6.71 0.795 1.015 0.957 1.098 1.174 1.332 1.65 2.01 2.09 2.57 2.38 3.49 2.98 3.96 3.53 4.64 3.95 5(02 4.44 ' 5.47 5.13 6.99 6.98 9.76 10.18 13.58 13.08 17.73 0.892 1.084 1.337 1.84 2.32 2.68 3.28 3.96 4.43 5.00 5.99 8.56 12.35 16.35 1.083 1.340 I.874 2.16 2.76 3.74 4.28 4.99 5.46 6.02 7.76 II.09 15.60 18;76 1.235 1.481 1.815 2.54 3.21 3.66 4.48 5.41 6.07 6.81 7.84 10.55 15.41 19.67 1.575 1.925 2.68 3.09 4.05 5.33 6.04 7.07 7.72 8.52 10:64 14.74 20.41 26.65 1.622 1.943 2.38 3.32 4.19 4.77 5.83 7.03 7.87 8.82 10.08 13.44 19.58 24.87 2.07 2.53 3.54 4.06 5.17 6.95 7.89' 9.24 10.07 10.97 13.75 18.97 26.26 34.11 Including areas of accompanying flanges bolted to the fitting. peratures of the insulations. It should be emphasized that they are the average values obtained from a number of tests made on each type of material, also that alt variables due to differences in thickness, pipe sizes, and air conditions are eliminated. Individual manufacturer's materials will, of course, vary in conductivity to some extent from these values.