Hello,
I am designing a HVAC system for an Equipment Room. Design set point is 22 deg C with 55% humidity. When I set the parameters and run in HAP, it says reheat is not required (@ setpoint of 55% RH).

Now, there are instances when the internal sensible loads are not high enough to raise the supply air temperature (13 deg) to room setpoint, and I end up in a mess with very high RH in room, sometimes even condensation .

I need to introduce a heater to control this. The issue is, the heater capacity is damn high if I consider the temperature difference of 9 (22 - 13), with the airflow of 12000l/s! Its more than the chiller capacity and its ridiculous!

What would be the best solution to reduce this reheater capacity to an optimum level?

N.B
Im using Q=mCp(T2-T1) for calculating the capacity.

Thanks
Nevin.