AOYOU - Data of cooling effect
Below illustrations highlight the significance of air cooling with open space cooling system in workspace settings:
The example given here is based on a set of temperature conditions recorded in year 2008.
With open space cooling, the reduction in workspace temperature is significant C equals to an average reduction of 5-6 outdoor temperature. The temperature reduction is even more significant when compared to the workspace temperature C an average reduction of 8-10 inside the workspace area. By taking advantage of the wind-chill factor, the temperature reduction capability of open space cooling is illustrated by an example workspace setting that is equipped with open space cooling and wind-chill effect, the temperature is cooled from 36.5 to 25.9 (i.e. a net reduction of 10.6).
 
 
Factory with No Cooling
   Outside Dry Bulb Temp 33.5
   Outside Wet Bulb Temp 26.5
  Radiant Heat 3.0
   Inside Temperature 36.5
   Increase in Temperature 3.0
 
 Dry Bulb Temp 33.5
 Wet Bulb Temp 26.5
Inside Temp Sensation: 36.5
Increase in Temp: 3
 
Factory with Open Space Cooling
   Outside Dry Bulb Temp 33.5
   Outside Wet Bulb Temp 26.5
   Radiant Heat 3.0
   Supply Air Temperature 27.9
   Inside Temp before cooling 36.5
   Reduction in Temperature 8.6
 
 Dry Bulb Temp 33.5
 Wet Bulb Temp 26.5
Inside Temp Sensation: 27.9
Reduction in Temp:8.6
 
Factory With Open Space Cooling and Wind-Chill Effect
   Outside Dry Bulb Temp 33.5
   Outside Wet Bulb Temp 26.5
   Radiant Heat 3.0
   Supply Air Temperature 27.9
   Inside Temp Before Cooling 36.5
   Workers Temp Sensation 25.9
   Reduction in Temperature Sensation 10.6
 
 Dry Bulb Temp 33.5
 Wet Bulb Temp 26.5
Worker Temp Sensation: 25.9
Reduction in Temp:10.6
 
Supply Air Temperature
 
The Supply Air Temperature depends on the "dryness" of the outside air at that time. The drier the outside air, the lower is the wet bulb temperature. The lower the wet bulb temperature, the more temperature depression can be achieved. Table beside illustrates the Supply Air Temperature at several actual occasions in the Guangdong Province.  
Supply Air Temperature
   Outside Dry Bulb Temp 31.9 32 33.5 38.2
   Outside Wet Bulb Temp 26.8 28 26.5 27.2
   Psychrometric difference 5.1 4 7 11
   Supply Air Temp 27.8 28.8 27.9 29.4
Dry bulb temperature is the actual temperature of the air in the atmosphere.
Wet bulb temperature is the temperature of the air if water is allowed to
    evaporate into the air.
 
The Wind-Chill Effect
 
Wind-Chill Effect is the secondary cooling effect when air passes over human skin (similar to a fan created effect) thereby causing a lower temperature sensation. The Wind-Chill Effect depends on both the Supply Air Temperature and the air velocity. As an example, supply air temperature of 28C at 10 m/s velocity can create a sensation of 25.6C.  
Wind-Chill Effect
Air Velocity
m/s
Supply Air Tempetature
25 26 27 28 29 30
Equivalent Temperature Sensation on human
8 21.7 23.3 24.4 26.1 27.2 28.9
9 21.7 22.8 24.4 26.1 27.2 28.9
10 21.1 22.8 24.4 25.6 27.2 28.9
11 21.1 22.8 23.9 25.6 27.2 28.3
12 21.1 22.8 23.9 25.6 27.2 28.3
 
Supply Air Effective Temperature
 
The Supply Air Effective Temperature table here takes into consideration the Wind-Chill Effect of an average cooler sensation of 2C.To predict the Inside Supply Air Effective Temperature, decide the Outside Air Dry-Bulb Temperature first. The column of values below that provides the temperature range. As to what is the actual Inside Supply Air Effective Temperature, it depends on the outside air dryness shown on the left hand column.

This zone is not applicable as
in reality when the temperature is
relatively high, RH is predominantly low
 
Supply Air Effective Temperature
Outside Air
RH(%)
Outside Air Dry-Bulb Temperature
30 31 32 33 34 35 36 37 38 39 40
35 21 21 22 23 24 25 25 26 27 28 29
40 22 22 23 24 25 26 26 27 28 29 30
45 22 23 24 25 26 27 27 28 29 30  
50 23 24 25 26 27 27 28 29 30    
55 24 25 26 27 27 28 29 30      
60 25 26 26 27 28 29 30        
65 25 26 27 28 29 30          
70 26 27 28 29 30            
75 27 28 29 30              
80 28 28 29 30              
Supply air temperature is taken at immediate downstream of fan.
Cooling Space
Data of cooling effect
Annual cooling effect
Quarter cooling effect
Cooling Effect
 
Copyright © Fujian Aoyou Electrical co.,ltd. All rights reserved
Tel: 0595-86233338   Add: Xinting Industry, Shengxin Town, Nan’an, Quanzhou, Fujian, China