8/17/2019 Typical Losses Per Manufacturer at Full Load

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Typical Losses per Manufacturer at Full Load

To calculate total heat losses on the 1st

 floor,

( )  

Loss associated with 3750 kVA load on 1st  Floor = 46 kW loss

 

To calculate total heat losses in the Mezzanine,

( )  

Loss associated with 1500 kVA load in Mezzanine = 20.5 kW loss

 

Overall heat loss due to all loads is then given by the sum of the losses on the 1st

 Floor and Mezzanine

 

The overall heat loss due to all loads (in kW) is equivalent to the heat transfer rate to or from air, q (in

Btu/h).

 

In order to determine the airflow rate, the Sensible Heating or Cooling equation is used:

 

where q = heat transfer rate to or from air, Btu/h

Q a = airflow rate, cfm

Ρa = density of air, lb/ft3 

Cp = specific heat of air, Btu/lb∙⁰F

Δt = temperature increase or decrease of air, ⁰F 

For standard air with a density of 0.075 lb/ft3 and a specific heat of 0.24 Btu/lb∙⁰F, the Sensible Heating

or Cooling equation can be simplified to:

 

Solving for the airflow rate, the equation becomes

()