Clymber
Mechanical
- Jan 7, 2003
- 46
We are renovating an existing greenhouse. The researchers moving into this renovated space require evaporative cooling. This greenhouse, which is divided into two 20' x 33' sections, will have a very short pad-to-fan distance (side wall to opposite side wall). Both ASHRAE and the Nat Greenhouse Mfr Assn (NGMA) recommend a baseline 8 CFM/SF for evaporative cooling airflow. However, the NGMA ventilation white paper requires an additional "velocity adjustment factor" when the pad-to-fan distance is below 100'. In this case that factor is 2.24, which is a significant increase in airflow required.
Which is correct? The pad design is the critical airflow piece. I don't want to over-ventilate such a small space, and pad selection hinges on airflow requirements.
Any ideas or recommendations here?
Thanks in advance.
-Brad
Which is correct? The pad design is the critical airflow piece. I don't want to over-ventilate such a small space, and pad selection hinges on airflow requirements.
Any ideas or recommendations here?
Thanks in advance.
-Brad