Miami Retail Dehumidification Load peak )

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Winfred Gibson
6 years ago
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1 Miami Retail Dehumidification Load peak ) Respiration (PPL) Occupant Ventilation Bldg. Ventilation Infiltration (ACH Nat) 19 Door Activity 5 Humid Product Damp Carpet Permeation (Walls) TOTAL LOAD = 345 lb/h Control Level ( F, gr/lb) TOTAL LOAD = 130 lb/h, or 16 gallons/hour Indoor Humidity Ratio 65 Grains per pound Number of Occcupants 75 Ventilation Rate (per person) 7.5 cfm per person ( 5.0 = Auditoriums & Offices 7.5 = Retail 10 = Students) Ventilation Rate per sq.ft. (Min) 0.12 cfm per ft2 (0.06 = Auditoriums 0.12 = Retail, classrooms, 0.18 = Offices) Infiltration Test Pressure 0.25 cfm per 75 Pa - six sides (Tight =.25 Average =.75 Loose = 1.5) Door Openings 100 Openings per hour Humid Product 10 Humid dresses per hour Damp Carpet 10 Square feet of damp carpet (rainy weather) Permeation (Walls) 1.6 gr/hr/in.hg. 1.6 = Enamel paint w. primer 2.4 = Unpainted concrete block 50.0 = Unpainted gypsum board.

2 Weather Data for Design 83 Dry Bulb Temperature ( F) 144 Humidity Ratio (gr/lb) 0.95 Vapor Pressure (in.hg.) Miami, FL Phoenix, AZ Dry Bulb Temperature ( F) Humidity Ratio (gr/lb) Vapor Pressure (in.hg.) Seattle, WA Chicago, IL Dry Bulb Temperature ( F) Humidity Ratio (gr/lb) Vapor Pressure (in.hg.) Atlanta, GA St. Louis, MO Dry Bulb Temperature ( F) Humidity Ratio (gr/lb) Vapor Pressure (in.hg.) Bahrain London, England Dry Bulb Temperature ( F) Humidity Ratio (gr/lb) Vapor Pressure (in.hg.)

3 Building Walls Length Height/Width Total Area (ft) (ft) (ft2) Wall ,500 Wall ,500 Wall ,500 Wall ,500 Total Wall Surface (permeation) 10,000 Floor Area ,000 Number of floors 1 Total floor area 10,000 Total air barrier surface (for infiltration) 30,000

4 Numbers Used For The Summary Graph Permeation (Walls) 1.2 Don't changes any of these numbers Damp Carpet 0.5 They just repeat the values calculated below Humid Product 1 Door Activity 5 Infiltration (ACH Nat) 19 Bldg. Ventilation cfm total total minimum ventilation Occupant Ventilation cfm total for people Respiration (PPL) Total 130 Calculations For Individual Load Elements Respiration Lb/h Number of people 75 Don't enter the # of people here! If you want to change this value, go to the "Summary" sheet. lb/h/person = Seated theater patron 0.15 = Seated restaurant diner 0.19 = Walking retail patron 0.24 = Walking retail clerk 0.60 = Restaurant server 1.04 = Basketball, vigorous exersize Ventilation (PPL) 29 Lb/h Number of people 75 Don't enter the # of people here! If you want to change this value, go to the "Summary" sheet. cfm/person 7.5 Don't enter the cfm/person here! If you want to change this value, go to the "Summary" sheet. Ventilation (Minimum) 61 Lb/h Square feet in the building Don't enter the square feet here! If you want to change this value, go to the "Building Walls & Floor" sheet. cfm/ft Don't enter the cfm/f2 here! If you want to change this value, go to the "Summary" sheet. Whole-building Infiltration 19 Lb/h (natural) cfm (Natural) 375 LBL Number for the site 20 specified ACH Air barrier surface area (ft2) Don't enter the internal volume here! If you want to change this value, go to the "Building" sheet. 75 Pa test pressure 0.25 Don't enter the ach/75 here! This box simply repeats the value entered on the summary sheet Door Activity 5 Lb/h

5 Openings/hr 100 Don't enter this value here. To change it, go to the "Summary" sheet Vestibule Height (ft) 10 Vestibule width (ft) 15 Vestibule depth (ft) 20 Vestibule volume (ft3) 3000 Calculated from the height, width and depth values. Pecent air exchange 0.15 The base assumption is that 0.15 (15%) of the airlock air enters the building with each door opening. If you want to change that assumption, do it here and enter the number as a decimal. Humid Product 0.8 Lb/h Number of dresses/hr 10 Don't enter the # of dresses here! If you want to change this value, go to the "Summary" sheet. Dry Weight Of One Dress (lb) 1.5 A typical cotton dress weighs weighs about 1.5 lbs when dry. Percent MC at Loading Dock Condition 0.12 At 85%rh, cotton absorbs about 0.12 times it's dry weight of water vapor Percent MC at Control Condition 0.07 At 50%rh, the same dress contains about 0.07 times it's dry weight of water vapor Wet Carpet 0.5 Lb/h Square feet of wetted carpet 10 Don't enter this value here. To change it, go to the summary sheet Evap rate (lb/h/ft2) = Truck-mount unit, wide-open spaces, poor extraction 0.05 = Truck-mount unit, small spaces, poor extraction 0.01 = Truck-mount unit, wide-open spaces, good extraction Wall Permeation 1.2 Lb/h Square feet of wall surface Don't enter the square feet here! If you want to change this value, go to the "Building Walls & Floor" sheet. Perm value of wall 1.6 Don't enter this value here. To change it, go to the "Summary" sheet Outdoor vapor pressure (in.hg.) 0.95 Don't enter this value here. To change it, go to the "Weather City" sheet. Indoor vapor pressure (in.hg.) = 65 gr/lb 0.37 = 55 gr/lb 0.30 = 45 gr/lb 0.24 = 35 gr/lb

Design Criteria Data

MEMPHIS TN Latitude = 35.35 N WMO No. 723345 Longitude = 89.87 W Elevation = 322 feet Period of Record = 1973 to 1996 Average Pressure = 29.68 inches Hg Design Criteria Data Mean Coincident (Average) Values