Heat of Occupants
     Qo = n × Q / person × D .F .
     Where :
     n = Number of occupants
     Q = Heat produced / per...
Example:
     100 persons
     seating in theater.
     Calculate the heat
     From occupants:

      Qo = n × Q / person...
Light Heat gain

             Example          W / m2   Type of Building

     For 150 m2 area flat,     60             Of...
Heat of equipment & Motors
     Example:
                               Motor Power        Efficiency
     A computer room...
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Cooling Load Estimation

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Cooling Load Estimation

  1. 1. Heat of Occupants Qo = n × Q / person × D .F . Where : n = Number of occupants Q = Heat produced / person Q = (Qs + QL ) / person D.F . = Diversity factor 15
  2. 2. Example: 100 persons seating in theater. Calculate the heat From occupants: Qo = n × Q / person Qs = 100 × 72 = 7200 W QL = 100 × 31 = 3100 W Qo = 100 × ( 72 + 31) = 10300 W Assuming D.F . = 1 121 Light Heat gain. Q L = ∑ (I n + 1.25 F) in watt Where : I n = heat radiation from lamps in watt. ( From Electrical Drawing) F = heat radiation From Fluorescent Or using Specific table ; Q L = Area × ( W/m 2 ) × DF. Diversity Factor DF taking into consideration the possibilty of not using all lighting connections at the same time . For Example 65% of the light is ON DF = 0.65 16
  3. 3. Light Heat gain Example W / m2 Type of Building For 150 m2 area flat, 60 Office estimate the heat 45 Factory gained from lighting: School, University 150 x 20 = 3000 W. 40 Assuming DF = 1. 20 Flat, theater, hotel, 17 Restaurant 15 Hospital, Library, Museum 123 Heat of equipment & Motors Qe = Sum ( E ×η ) Where : E = Power in watt . η = Efficiency of the motor . 17
  4. 4. Heat of equipment & Motors Example: Motor Power Efficiency A computer room, having 10 computers Less than 200 0.6 Watts. calculate the heat From 375 up to 750 0.7 gained from Watts computers; each From 1 Kw up to 4 0.8 computer has a power Kw of 700 Watts. From 5.5 Kw up to 0.85 15 Kw. Qe = Sum ( E ×η ) Greater than 15 Kw. 0.88 Qe = 10 (700 × 0.7 ) Qe = 4900 W . Heat gain from some equipments, W 18

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