The engineering task
Humid process air must reach a specified dew point. It is cooled below dew point, condensate is removed and the air is often reheated or mixed with return air to the required supply temperature.
Sensible and latent loads require separate balances. Bypass factor, wet coil surface, condensate drainage and fan heat affect the actual outlet state.
Required design data
- Dry/wet-bulb state or relative humidity
- Supply-air dew point and target temperature
- Fresh/return-air fractions
- Coolant temperature and air pressure drop
Technical solution approach
Determine air states
Calculate humidity ratio, enthalpy and dew point for each inlet stream.
Form the mixed state
Balance fresh and return air on a dry-air basis.
Balance cooling and condensation
Cooling duty and condensate follow from enthalpy change to the coil outlet.
Size coil and reheat
Match area, coolant flow and any reheat to dew point and supply-air temperature.
Integrate the fan
Feed filter, coil and duct losses plus fan heat back into the final state.
Expected deliverables
Suitable SOL ALPHA modules
The modules form a technically plausible toolchain. Their final selection and sequence will be confirmed during the later calculation against the applicable code and project conditions.