The diagrams below are calculated from the equations above and can be used to estimate heat required to rise temperature in air flows.
A building with a large room with a heat loss 20 kW is heated with air with a maximum temperature 50 o C . The room temperature is 20 o C . The required air flow rate can be calculated as
L = (20 kW) / ((1.005 kJ/kg o C) (1.2 kg/m 3 ) ((50 o C) - (20 o C)))
= 0.55 m 3 /s
Required air flow from an electric furnace can be expressed in Imperial units as
L cfm = P w 3.42 / 1.08 dt (3)
L cfm = required air flow (cfm)
P w = electric power (watts)
dt = temperature difference ( o F)
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Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.
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Latent and sensible cooling and heating equations - imperial units.
Ventilation and heat-recovery calculations, sensible and latent heat - online calculators - imperial units.
Classification of heat recovery efficiencies - temperature efficiency, moisture efficiency and enthalpy efficiency - online heat exchanger efficiency calculator.
Calculating steam and condensate loads in steam heated systems.
Enthalpy change and temperature rise when heating humid air without adding moisture.
Latent heat is the heat when supplied to or removed from air results in a change in moisture content - the temperature of the air is not changed.
The change in state wwhen mixing moist air - enthalpy, heat, temperature and specific humidity.
Sensible and latent heat of moist air.
Calculating heat removed with air by measuring the wet bulb temperature.
Calculate steam heated air systems.
Calculating the amount of steam in non-flow batch and continuous flow heating processes.
Steam radiators and steam convectors - heating capacities and temperature coefficients.
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