Condensate Flow Rate Calculator for HVAC Systems

This condensate flow rate calculator is designed to calculate the amount of moisture removed from air across a cooling coil. Enter the air conditions for both on-coil air (entering air) and off-coil air (leaving air).

For each condition, input the barometric pressure, dry bulb temperature, and select one parameter such as relative humidity, wet bulb temperature, dew point, humidity ratio, or enthalpy. Then enter the corresponding value along with the airflow rate (m³/hr).

Once all inputs are provided, click calculate to determine the condensate flow rate, which is essential for drain sizing, coil design, and dehumidification system performance evaluation.

Condensate flow rate is determined by calculating the difference in humidity ratio between entering and leaving air conditions across a cooling coil, multiplied by the airflow rate.

In simple terms:
Condensate = Airflow × (Humidity Ratio In – Humidity Ratio Out)

This calculation helps engineers evaluate latent heat removal and ensures that the drainage system can handle the moisture removed during cooling and dehumidification processes.

Accurate condensate flow rate calculation is essential for designing reliable HVAC systems. Incorrect estimation can lead to undersized drainage systems, water overflow, and damage to equipment or building interiors.

Proper condensate calculation ensures efficient humidity control, system performance, and long-term reliability, especially in high humidity environments like the UAE where moisture loads are significantly higher.