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Density, Moisture, and Static Pressure Loss in Air Ducts, Study notes of Chemistry

Long Island University (LIU) - RiverheadChemistry

A table of density and moisture weight per cubic foot of air at various temperatures and relative humidities, as well as a table of duct flow and static pressure losses per 100 feet at different duct diameters and flow rates. The data can be useful for hvac system design and analysis.

What you will learn

  • What is the relationship between temperature, relative humidity, and the density and moisture weight of air?
  • How can the data in these tables be used in HVAC system design and analysis?
  • How does duct diameter and flow rate affect static pressure losses in air ducts?

Typology: Study notes

2021/2022

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100% 90% 80% 70% 60% 50% 5%
Temp. Density Moisture Density Moisture Density Moisture Density Moisture Density Moisture Density Moisture Density Moisture
(°F) (lb/ft3) (lb/ft3) (lb/ft3) (lb/f t3) (lb/ft3) (lb/ft3) (lb/ft3) (lb/ft3) (lb/ft3) (lb/f t3) (lb/ft3) (lb/ft3) (lb/ft3) (lb/ft3)
32 0.0806 0.00030 0.0806 0.00027 0.0806 0.00024 0.0807 0.00021 0.0807 0.00018 0.0807 0.00015 0.0808 0.00002
36 0.0799 0.00035 0.0799 0.00032 0.0800 0.00028 0.0800 0.00025 0.0800 0.00021 0.0800 0.00018 0.0801 0.00002
40 0.0793 0.00035 0.0793 0.00037 0.0793 0.00033 0.0793 0.00029 0.0794 0.00025 0.0794 0.00021 0.0795 0.00002
60 0.0759 0.00083 0.0760 0.00075 0.0760 0.00067 0.0761 0.00058 0.0767 0.00050 0.0762 0.00042 0.0764 0.00004
70 0.0743 0.00116 0.0744 0.00104 0.0744 0.00093 0.0745 0.00081 0.0746 0.00069 0.0746 0.00058 0.0750 0.00006
72 0.0740 0.00123 0.0740 0.00111 0.0741 0.00099 0.0742 0.00086 0.0743 0.00074 0.0743 0.00062 0.0747 0.00006
76 0.0733 0.00140 0.0734 0.00126 0.0735 0.00112 0.0736 0.00098 0.0737 0.00084 0.0737 0.00070 0.0741 0.00007
80 0.0727 0.00159 0.0727 0.00143 0.0728 0.00127 0.0729 0.00111 0.0730 0.00095 0.0731 0.00079 0.0736 0.00008
84 0.0720 0.00179 0.0721 0.00161 0.0722 0.00144 0.0723 0.00126 0.0724 0.00108 0.0725 0.00090 0.0730 0.00009
88 0.0713 0.00202 0.0714 0.00182 0.0716 0.00162 0.0717 0.00142 0.0718 0.00121 0.0719 0.00101 0.0725 0.00010
92 0.0706 0.00228 0.0708 0.00205 0.0709 0.00182 0.0710 0.00159 0.0712 0.00137 0.0713 0.00114 0.0719 0.00011
96 0.0699 0.00256 0.0701 0.00230 0.0703 0.00205 0.0704 0.00179 0.0706 0.00154 0.0707 0.00128 0.0714 0.00013
100 0.0693 0.00287 0.0694 0.00258 0.0696 0.00230 0.0698 0.00201 0.0699 0.00172 0.0701 0.00143 0.0709 0.00014
110 0.0675 0.00379 0.0677 0.00341 0.0679 0.00303 0.0681 0.00265 0.0684 0.00227 0.0686 0.00189 0.0696 0.00019
120 0.0656 0.0494 0.0659 0.00445 0.0662 0.00396 0.0665 0.00346 0.0667 0.00297 0.0670 0.00247 0.0684 0.00025
130 0.0635 0.00639 0.0639 0.00575 0.0643 0.00511 0.0647 0.00447 0.0651 0.00383 0.0655 0.00319 0.0672 0.00032
140 0.0614 0.00817 0.0618 0.00735 0.0623 0.00653 0.0628 0.00572 0.0633 0.00490 0.0638 0.00408 0.0660 0.00041
150 0.0590 0.01034 0.0596 0.00931 0.0602 0.00828 0.0608 0.00724 0.0614 0.00621 0.0621 0.00517 0.0649 0.00052
160 0.0564 0.01299 0.0571 0.01169 0.0579 0.01039 0.0587 0.00909 0.0595 0.00779 0.0602 0.00649 0.0637 0.00065
170 0.0535 0.01617 0.0544 0.01455 0.0554 0.01293 0.0564 0.01132 0.0573 0.00970 0.0583 0.00808 0.0626 0.00081
180 0.0503 0.01997 0.0514 0.01797 0.0526 0.01597 0.0538 0.01398 0.0550 0.01198 0.0562 0.00998 0.0615 0.00100
190 0.0447 0.02247 0.0463 0.02022 0.0 480 0.01798 0.0496 0.01573 0.0513 0.01348 0.0529 0.01124 0.0603 0.00112
200 0.0427 0.02978 0.0444 0.02680 0.0462 0.02382 0.0480 0.02084 0.0497 0.01787 0.0515 0.01489 0.0594 0.00149
TABLE 1. DENSITY AND MOISTURE WEIGHT PER CUBIC FOOT OF AIR AND RELATIVE HUMIDITY
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1,000 ft/min 1,500 ft/min 2,000 ft/min 2,500 ft/min 3,000 ft/min 3,500 ft/min 4,000 ft/min DiameterDuct^ FlowRate^ PressureStatic^ FlowRate^ PressureStatic^ FlowRate PressureStatic^ FlowRate^ PressureStatic^ FlowRate^ PressureStatic^ FlowRate^ PressureStatic^ FlowRate^ PressureStatic

  • 32 0.0806 0.00030 0.0806 0.00027 0.0806 0.00024 0.0807 0.00021 0.0807 0.00018 0.0807 0.00015 0.0808 0. Temp.(°F) Density(lb/ft 3 ) Moisture(lb/ft 3 ) Density(lb/ft 3 ) Moisture(lb/ft 3 ) Density(lb/ft 3 ) Moisture(lb/ft 3 ) Density Moisture(lb/ft 3 ) (lb/ft 3 ) Density(lb/ft 3 ) Moisture(lb/ft 3 ) Density(lb/ft 3 ) Moisture(lb/ft 3 ) Density(lb/ft 3 ) Moisture(lb/ft 3 )
  • 36 0.0799 0.00035 0.0799 0.00032 0.0800 0.00028 0.0800 0.00025 0.0800 0.00021 0.0800 0.00018 0.0801 0.
  • 40 0.0793 0.00035 0.0793 0.00037 0.0793 0.00033 0.0793 0.00029 0.0794 0.00025 0.0794 0.00021 0.0795 0.
  • 60 0.0759 0.00083 0.0760 0.00075 0.0760 0.00067 0.0761 0.00058 0.0767 0.00050 0.0762 0.00042 0.0764 0.
  • 70 0.0743 0.00116 0.0744 0.00104 0.0744 0.00093 0.0745 0.00081 0.0746 0.00069 0.0746 0.00058 0.0750 0.
  • 72 0.0740 0.00123 0.0740 0.00111 0.0741 0.00099 0.0742 0.00086 0.0743 0.00074 0.0743 0.00062 0.0747 0.
  • 76 0.0733 0.00140 0.0734 0.00126 0.0735 0.00112 0.0736 0.00098 0.0737 0.00084 0.0737 0.00070 0.0741 0.
  • 80 0.0727 0.00159 0.0727 0.00143 0.0728 0.00127 0.0729 0.00111 0.0730 0.00095 0.0731 0.00079 0.0736 0.
  • 84 0.0720 0.00179 0.0721 0.00161 0.0722 0.00144 0.0723 0.00126 0.0724 0.00108 0.0725 0.00090 0.0730 0.
  • 88 0.0713 0.00202 0.0714 0.00182 0.0716 0.00162 0.0717 0.00142 0.0718 0.00121 0.0719 0.00101 0.0725 0.
  • 92 0.0706 0.00228 0.0708 0.00205 0.0709 0.00182 0.0710 0.00159 0.0712 0.00137 0.0713 0.00114 0.0719 0.
  • 96 0.0699 0.00256 0.0701 0.00230 0.0703 0.00205 0.0704 0.00179 0.0706 0.00154 0.0707 0.00128 0.0714 0.
  • 100 0.0693 0.00287 0.0694 0.00258 0.0696 0.00230 0.0698 0.00201 0.0699 0.00172 0.0701 0.00143 0.0709 0.
  • 110 0.0675 0.00379 0.0677 0.00341 0.0679 0.00303 0.0681 0.00265 0.0684 0.00227 0.0686 0.00189 0.0696 0.
  • 120 0.0656 0.0494 0.0659 0.00445 0.0662 0.00396 0.0665 0.00346 0.0667 0.00297 0.0670 0.00247 0.0684 0.
  • 130 0.0635 0.00639 0.0639 0.00575 0.0643 0.00511 0.0647 0.00447 0.0651 0.00383 0.0655 0.00319 0.0672 0.
  • 140 0.0614 0.00817 0.0618 0.00735 0.0623 0.00653 0.0628 0.00572 0.0633 0.00490 0.0638 0.00408 0.0660 0.
  • 150 0.0590 0.01034 0.0596 0.00931 0.0602 0.00828 0.0608 0.00724 0.0614 0.00621 0.0621 0.00517 0.0649 0.
  • 160 0.0564 0.01299 0.0571 0.01169 0.0579 0.01039 0.0587 0.00909 0.0595 0.00779 0.0602 0.00649 0.0637 0.
  • 170 0.0535 0.01617 0.0544 0.01455 0.0554 0.01293 0.0564 0.01132 0.0573 0.00970 0.0583 0.00808 0.0626 0.
  • 180 0.0503 0.01997 0.0514 0.01797 0.0526 0.01597 0.0538 0.01398 0.0550 0.01198 0.0562 0.00998 0.0615 0.
  • 190 0.0447 0.02247 0.0463 0.02022 0.0480 0.01798 0.0496 0.01573 0.0513 0.01348 0.0529 0.01124 0.0603 0.
  • 200 0.0427 0.02978 0.0444 0.02680 0.0462 0.02382 0.0480 0.02084 0.0497 0.01787 0.0515 0.01489 0.0594 0.
    • 8 349 0.21 524 0.45 698 0.77 873 1.18 1,047 1.68 1,222 2.26 1,396 2. (in.) (cfm) Loss (in. w.c.) (cfm) Loss (in. w.c.) (cfm) Loss (in. w.c.) (cfm) Loss (in. w.c.) (cfm) Loss (in. w.c.) (cfm) Loss (in. w.c.) (cfm) Loss (in. w.c.)
  • 10 545 0.16 818 0.34 1,091 0.59 1,364 0.90 1,636 1.28 1,909 1.72 2,182 2.
  • 12 785 0.13 1,178 0.27 1,571 0.47 1,963 0.72 2,356 1.02 2,749 1.37 3,142 1.
  • 14 1,069 0.10 1,604 0.22 2,138 0.39 2,673 0.59 3,207 0.84 3,742 1.14 4,276 1.
  • 16 1,396 0.09 2,094 0.19 2,793 0.33 3,491 0.50 4,189 0.72 4,887 0.97 5,585 1.
  • 18 1,767 0.08 2,651 0.16 3,534 0.29 4,418 0.44 5,301 0.62 6,185 0.84 7,069 1.
  • 20 2,182 0.07 3,272 0.15 4,363 0.25 5,454 0.38 6,545 0.55 7,636 0.74 8,727 0.
  • 22 2,640 0.06 3,960 0.13 5,280 0.22 6,600 0.34 7,919 0.49 9,239 0.66 10,559 0.
  • 24 3,142 0.05 4,712 0.12 6,283 0.20 7,854 0.31 9.425 0.44 10,996 0.59 12,566 0.
  • 30 4,909 0.04 7,363 0.09 9,817 0.15 12,272 0.24 14,726 0.33 17,181 0.45 19,635 0.
  • 36 7,069 0.03 10,603 0.07 14,137 0.12 17,671 0.19 21,206 0.27 24,740 0.36 28,274 0.
  • 42 9,621 0.03 14,432 0.06 19.242 0.10 24,053 0.16 28,863 0.22 33,674 0.30 38,485 0.
  • 48 12,566 0.02 18,850 0.05 25,133 0.09 31,416 0.13 37,699 0.19 43,982 0.26 50,265 0.
  • 54 15,904 0.02 23,856 0.04 31,809 0.08 39,761 0.12 47,713 0.17 55,665 0.22 63,617 0.
  • 60 19,635 0.02 29,452 0.04 39,270 0.07 49,087 0.10 58,905 0.15 68,722 0.20 78,540 0.