[Er.Pankaj Garg]

Types of Internal Load in HVAC cooling load calculation 


Types of Internal Load are

1. Internal loads are
   
   
   1. People
      
   2. Lights
      
   3. Equipment or appliances
      
2. Consist of convective and radiant components
   
   1. Light (mostly radiant)
      
   2. Electrical heat (radiant and convective)
      
   3. People (most convective)
      
3. Time-delay effect  due to thermal storage
   

Internal Load- Lighting
•Heat gain (lighting)= 1.2 x total wattage x CLF
  Or based on light power density ranging from 10-25 W/m2(average   density, say=20 W/m2) •Where light is continuously on, CLF=1

Area                       Light Power Density W/m2
Office                     25
Corridor                 10
Sleeping                10
Recreation            20
Bus terminals         25
Kitchen                   25

Total heat gain from the occupants
Table shows typical values of total heat gain from the occupants and also the sensible heat gain fraction as a function of activity in an air conditioned space.
Activity         Total heat gain, W   Sensible heat   gain fraction  
Sleeping         70 0.75 
Seated, quiet 100 0.60 
Standing 150 0.50 
Walking @ 3.5 kmph 305 0.35 
Office work 150 0.55 
Teaching 175 0.50 
Industrial work 300 to 600 0.35

Q people-s= No x sensible heat gain/p x CLF
Q people-L= No x latent heat gain/p


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