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Unit Sizing

 

Airex Spray Nozzle Air Washer

 Airex Spray Nozzle Washer

FORMULA A

Air washer leaving air dry bulb can be calculated from formula: 

	T2 = T1 - (T1 - T3) (E) 

	Where: 
	T2 = Leaving dry bulb
	T1 = Entering dry bulb
	T3 = Entering wet bulb 
	E  = Efficiency

FORMULA B

Air washer size for summer operation can be determined from CFM required by a two step process: 

       (1) Minutes per =   Design dry bulb 
           air change     -Design wet bulb
                           _______________
                                 10

       (2) CFM  =          Building volume in cubic feet
           required        _____________________________
                                Min.per air change

Increase CFM up to 50% for heavy loads or humid area

FORMULA C

BTU's of Attained Sensible Cooling 

CFM x Aƒ x DeltaT x E =
BTU's of attained sensible cooling
   Tons of Cooling = BTU's÷12,000

    CFM = Quantity of Delivered Air
     Aƒ = altitude factor
    DeltaT = design dry
bulb-design wet bulb
      E = efficiency 

  Sea level = 1.08      4,000 ft. = .93
  1,000 ft. = 1.04      5,000 ft. = .90
  2,000 ft. = 1.00      6,000 ft. = .86
  3,000 ft. = .97

Image Image

AVERAGE WATER CONSUMPTION

 
       
Evaporation = CFM(thousands) x (EDBT - LDBT)
			500
	i.e. E = 50 x (98 - 75) = 2.3 GPM
			500

Air Washer Dimensions

MODEL NO: 50
SNW		 75
SNW		 100
SNW		 140
SNW		 160
SNW		 180
SNW		 240
SNW		 300
SNW		 350
SNW		 400
SNW		 500
SNW		 600
SNW		 700
SNW		 800
SNW
A 42 1/4 48 1/4 60 1/4 72 1/4 84 1/4 84 1/4 96 1/4 96 1/4 120 1/4 144 1/2 168 1/2 168 1/2 168 1/2 216 1/2
B 42 1/8 42 1/8 54 1/8 54 1/8 54 1/8 66 1/8 66 1/8 78 1/8 78 1/8 78 1/8 78 1/8 90 1/8 102 1/8 102 1/8
C 7 7 7 7 7 7 7 7 7 7 7 7 7 7
D 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4 32 1/4

HIGHER EFFICIENCIES ALLOW FOR MORE COOLING PER CFM THAN OTHER EVAPORATIVE TYPES

Example: Airex 100 SNW at 90% efficiency in comparison to other evaporative types with their common 70% efficiency rating.

Common Type: 10,000 (CFM) x 30° (DeltaT) x .7 (E) 1.08 (Af ) = 226,800 BTUH (18.9 Tons)

100 SNW: 10,000 (CFM) x 30° (DeltaT) x .9 (E) 1.08 (Af ) = 291,000 BTUH (24.25 Tons)

There is a 22% difference in the amount of sensible cooling that can be achieved with an Airex unit over a conventional evaporative type. The common type evaporative cooler would require 12,857 CFM to attain equal sensible cooling in comparison to an Airex 100 SNW (10,000) CFM). This provides more than 5 tons of extra cooling capacity.

                      1975 S. Navajo St. Denver, CO. 80223-3845
                        1-800-886-5484
                      Tel (303) 934-5551 Fax (303) 922-3709

              EMAIL US: airexmse@aol.com

                In order to maintain our policy of continuous product improvement, we reserve the right to change      prices, specifications, rates, or dimensions without notice or obligation.

                                   Copyright 2003 - Airex