Cooling Load

[ChrisF11]

I am designing a HVAC system for a location off the coast of Nigeria.

Along with the AHU there is chiller system which I am trying to size.

To calculate the cooling load can I simply use the volume airflow multiplied by the density of air and the delta T? Or do I have to use the equation:

Qc = ma(ho – hs)

My problem with the later method is whilst I have the db and wb of the outside conditions i only have the db of the supply conditions so pinning down the process line of the psychrometric chart is difficult.

Would an acceptable solution be to estimate the %RH for the supply conditions?

Any advice would be appreciated.

[r.bartlett]

do you have a cooling load for the space already?

[ChrisF11]

Well i have calculated it using the air flow, air density and delta T but i dont think that is correct???

Is that a correct assumption

[marc5180]

Hi Chris, yes that is how I would do it.

Q= m x cp x DT

[ChrisF11]

Thanks Marc,

I was not sure if i should be using the enthalpies.

Really appreciated.

Regards

Chris