Document mbaNR3xENvVyRv1zoaKEaDyXQ

482 ' ___________ y - CHAPTER 26 Table 2. Constants for Determining, the Capacity of BIow-Through Type Unit Heaters for Various Steam Pressures . and Temperatures of Entering Air- , (Based on Steam Pressure of 8 psig and Entering Air Temperature of 60 F) , Steam Pressure .0 - -10 1.538 2 1,585 . 5 1.640 10 1.730 " i5;: . 1.799 20s - .1,861 30'' 1.966 ; 40 2.058 ' .50 2.134 .60 2.196 70 ,2.256 75 .2.283 . 80 .. . oo; 2.312 ; 2.36i 2.409 1.446 10 1.369 1,495 1.405 1.550 1.456 1.639 1.545 1.708. 1.614 1.769 1.675 1.871 1.775 1.959 1.862 . 2.035 T. 936, 2.094 1.997- 2.157 2.057 2.183 2.085 2.211 2.112 2.258 2.159;-. 2.307 . 2.204- Temperature of Entering Air 20 1.273 30 1.191 . 40 1.110 1.320 1.237 11155 1.370 1.289 1.206 1.460 1-375 . 1.290 1.525 1.441 1.335 1.584 1.498 . 1.416 1.684 - T597 1.509 i.771; 1.683. 1.596 1.845. 1.755' .1.666 1.902 1.811 1.725 1.961 1.872 1.782 1.990 1.896 1.808 2.015 1.925 1.836 2.063 1.968 , 1.880 2.108.. .. 2.015 1.927 60 . 1.034 60 0.956 1.078 1.000 1.127 1,050 1.211 i.131 1.275 1,194 1.333 1.251 1.429 1.346 1.511 1.430 1.582 1.498. 1.640 .1.555 1.696 1.610 1.721 , 1.635 1.748 1.660;. ' 1.792 1,705 . 1.836 1.749 . 70 ' 0.881.' 0.926 0.974 1.056 1.117 1,174 1.266. 1.3491.416 1,472 1.527 1.552 1.577; 1.621' 1.663 80 0:809 0.853 0.901 0.982 1.043 1.097 1.190 1.270 1.338 1.393 1.447 1.472 1.497 1.541 1.581 60 0.739 100, 0.671 0.782 0.713 - 0.829 0.760 0.908 . 0.838 0.970 0.897 1.024 0.952 .1.115 1.042 1.194 1.1-19 " 1.262 ' 1,187 1.314 1.239 1.368 1.293 1.392 1.316 1.418 1.342 1.461 1.383 . 1.502 1.424 . . o Note: To determine capacity at any steam pressure and entering temperature, multiply constant from table by rated capacity at 00 F entering air and 2 pal/ outlet temperature^lTStfafa^tory ^ ^ *mportant to determine whether the heater la suitable for the Increased pressure application and whether the resulting Increased ' - 1946 G u id e T ' U n it H eaters,'U nit Ventilators, U n it H um idifiers Table 3. Constants for Determining the Capacity of Dkiw-Through Type Unit Heaters for Various Steam Pressures and Temperatures of Entering Air (Based on Steam Pressure of 8 psig and Entering Air Temperature of 60 F) Stiam Pbessurb psi . - .0 ' "10 . 1.483.: ' 0 1.405 ' 1^ . 1.329, 20 1.253 2 1.520 1.442 1.363' 1.290 .5 1.565. 1.485 .1.410 1.334 10 ,1:637 1.558 1.480 . 1.403 15 1,688- . 1.610 ; 1.533 1.458 20 . . 1,728.. .1,649 1.572. , 1.498 30 i.803, 1.725 ; 1.648 1.572 . 40 50 1.864 1,787, ,1.710 1.927 , i. 850 . 1-773 1.637 1.700 .60 1.973 1.897 .1.820 1.748 70 2.018 . 1.943 1:869 1.795 .75 2.043 1.970 1.895 1.822 80 2.064 1.988 -. 1.914 1.841 90 - 2.102 2.028 1.951 1.878 ' . 100 2.150 2.071 1.994 1.919 . 30 1.178 1.215 1.260 1.328 1.382, '1.421 - 1.497 1.563 1,628 1.673 1.722 1.750 1.770 1.804 1.845 Tbmpbratuhb op Entering Am 40 1.105 50? 1-.032 60 , 0.962 1,141. 1.069 1,000 1.187 1.114 1.045 ,1.253 . 1.182 1.112 1.310 1.239 1.168 1.350 1.278 1.208 1.423 . 1.352 1.281- . 1.491 .1.420 1.350 1.554 1.483 1.416 1.601 1.531 : 1;463 1.651 . 1.582 1.512 1.680. 1.609 1.540 1.698 1.629 1.560 1.732 1.661 . 1.590 1.770 1.700 . .1.630 '70 0.892 $0 0.822 0.930 0.861 0.975 0.906 1.042 0.973 1.099 1,028 1.138 . 1.070 1.212 1.145 1.282 1.215 1.347 . 1.278 1.394 . 1.325 1.443 1.377 1.471 1.402 1.491 1.422 i .523 1.457 1.560 1.492 90 0.754 ioo* 0:688 - 0.792 0.728 - 0.838 0:771 . 0.903 0.838 ; 0.960 0.895 1.002 1.078 1.148 01936. .1 -010 ' l.osi : 1.211 l"l45 . 1.260 1.194 1.310 1:243 1.333. 1.268 1.354 1.288 1.387 1.321. 1.425.. 1.359 Note: To determine capacity at any steam pressure and entering temperature, multiply constant from table by rated capacity at 00 F entering air and 2 psi. When Increasing steam pressure it is important to determine whether the heater is suitable for the increased pressure application and whether the resulting increased , outlet temperature is satisfactory. - ^ ^ :\