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- air velocity is usually in the range of1.5-4 m/s
- Face velocity is based on the gross cross-sectional area for air flow
- increasing velocity leads to increasing the pressure Losses, Fan Power, and Noise
- increasing turbulence leads to increasing heat exchange between air and the other fluid
In this case, the air is regarded as a heat transfer fluid, which contributes to the absorption of heat generated by the fluid circulating in the condenser.
The air speed is the parameter that distinguishes the type of convection (natural convection or forced convection) and the flow regime: turbulence etc, in fact, good design condenser requires a calculation of optimization to achieve better performance.
The effect of amount of air and speed is the total heat rejection capacity of the condenser.
air speed considers to the total heat rejection capacity of the condenser.
as per application we can say about temperature example1450 rpm cooling tower we using forced air and case small Refrigerator we using normal air inside room if we using for 1000 rpm AC outdoor units we will using forced air for those application deference speed and as per adjust temperaturesensor the requires it will be deference
What condenser ?
it effects the noise and heat exchange efficiency
it is the total capacity for heat rejection of condenser
For the air cooled condenser (ACC), the energy balance is:
q = m_ ref (hin - hout) = m_ air cp_air(Ta_out -Ta_in)=UATlmm_ air = ro * A* V
this will lead to compact size air cooled condenser and good design
As the speed of air increses the face area of the condeser decreases As the amount of air increses, the face area of the condeser decreases
in most casses air velocity across condenser to be aroun 550 to 650 FPM
while CFM / ton to be from 600 to 800
