typical losses per manufacturer at full load
Post on 06-Jul-2018
213 Views
Preview:
TRANSCRIPT
-
8/17/2019 Typical Losses Per Manufacturer at Full Load
1/1
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
()
top related