Filters and Air Flow in .NET framework

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Filters and Air Flow
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FIGURE 94 Typical air-stream pattern (Tuttle & Bailey)
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Total pressure (tp) is the sum of the static pressure and the velocity pressure Total pressure is also known as impact pressure This pressure is expressed in inches of water The total pressure is directly associated with the sound level of an outlet Therefore, any factor that increases the total pressure will also increase the sound level The under-sizing of outlets or increases in the speed of the blower will increase total pressure and sound level Velocity pressure (vp) is the forward-moving force of air within a duct This pressure is measured in inches of water The velocity pressure is comparable to the rush of air from a punctured tire A velometer is used to measure air velocity (see Figure 93)
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DESIGNING A PERIMETER SYSTEM After the heat loss or heat gain has been calculated, the sum of these heat losses or heat gains will determine the size of the duct systems and the heating and cooling unit The three factors that ensure proper delivery and distribution of air within a room are location, type, and size of outlet Supply outlets, if possible, should always be located to blanket every window and every outside wall (see Figure 95) Thus, a register is recommended under each window The outlet selected should be a diffuser whose air pattern is fan-shaped to blanket the exposed walls and windows
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FIGURE 95
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Location of an outlet (Lima)
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The American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) furnishes a chart with the locations and load factors needed for the climate of each major city in the United States The chart should be followed carefully The type of house, the construction materials, location, room sizes, and exposure to sun and wind are important factors With such information, you can determine how much heat will be dissipated You can also determine how much cooling will be lost in a building The ASHRAE Handbook of Fundamentals lists the information needed to compute the load factors Calculate the heat loss or heat gain of the room; divide this figure by the number of outlets to be installed From this you can determine the Btu/h required of each outlet Refer to the performance data furnished by the manufacturer to determine the size the outlet should be For residential application, the size selected should be large enough so that the Btu/h capacity on the chart falls to the side where the quiet zone is indicated There is still a minimum vertical throw of 6 feet where cooling is involved
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Locating and Sizing Returns
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Properly locating and sizing return air grilles is important It is generally recommended that the returns be installed in high sidewalls or the ceiling They should be in one or more centrally located places This depends upon the size and floor plan of the structure Although such a design is preferred, low returns are acceptable for heating To minimize noise, care must be taken to size the return air grille correctly The blower in the equipment to be used is rated in cfm by the manufacturer This rating can usually be found in the specification sheets Select the grille or grilles necessary to handle this cfm The grille or grilles selected should deliver the necessary cfm for the air to be conditioned The throw should reach approximately three-quarters of the distance from the outlet to the opposite wall (see Figure 92) The face velocity should not exceed the recommended velocity for the application (see Table 91) The
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TABLE 91 Register of Grille Size 8 10 10 12 12 12 14 14 14 16 16 20 20 20 24 24 24 24 24 30 30 30 30 36 36 36 4 4 6 4 5 6 4 5 6 5 6 5 6 8 5 6 8 10 12 6 8 10 12 8 10 12 Register or grille size related to air capacities (in cfm) Area in Ft2 163 206 317 249 320 383 292 375 449 431 515 541 647 874 652 779 1053 1326 1595 978 1321 1664 2007 1589 2005 2414 Air Capacities in cfm 250 fpm 300 fpm 400 fpm 500 fpm 600 fpm 700 fpm 750 fpm 800 fpm 900 fpm 1,000 fpm 1,250 fpm 41 52 79 62 80 96 73 94 112 108 129 135 162 219 162 195 263 332 399 245 330 416 502 397 501 604 49 62 95 75 96 115 88 113 135 129 155 162 194 262 195 234 316 398 479 293 396 499 602 477 602 724 65 82 127 100 128 153 117 150 179 172 206 216 259 350 261 312 421 530 638 391 528 666 803 636 802 966 82 103 158 125 160 192 146 188 225 216 258 271 324 437 326 390 527 663 798 489 661 832 1,004 795 1,003 1,207 98 124 190 149 192 230 175 225 269 259 309 325 388 524 391 467 632 796 951 587 793 998 1,204 953 1,203 1,448 114 144 222 174 224 268 204 263 314 302 361 379 453 612 456 545 737 928 1,117 685 925 1,165 1,405 1,112 1,404 1,690 122 155 238 187 240 287 219 281 337 323 386 406 485 656 489 584 790 995 1,196 734 991 1,248 1,505 1,192 1,504 1,811 130 165 254 199 256 306 234 300 359 345 412 433 518 699 522 623 842 1,061 1,276 782 1,057 1,331 1,606 1,271 1,604 1,931 147 185 285 224 288 345 263 338 404 388 464 487 582 787 587 701 948 1,193 1,436 880 1,189 1,498 1,806 1,430 1,805 2,173 163 206 317 249 320 383 292 375 449 431 515 541 647 874 652 779 1,053 1,326 1,595 978 1,371 1,664 2,007 1,589 2,005 2,414 204 258 396 311 400 479 365 469 561 539 644 676 809 1,093 815 974 1,316 1,658 1,993 1,223 1,651 2,080 2,509 1,986 2,506 3,018
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