Assuming that you are trying to set a minimum ventilation value of 20% on an AHU, a 20 percent command to the parallel blade outdoor air damper will result in Select all that apply.
A. A 20 percent flow through the damper B. Greatly over ventilating the space C. excessive loads on the boiler in the winter and chiller in the summer D. unnecessarily increasing the owner�s utility bills
When setting a minimum ventilation value of 20% on an Air Handling Unit (AHU) and commanding a 20 percent opening of the parallel blade outdoor air damper, the following outcomes can be expected:
A. A 20 percent flow through the damper - This is correct. A 20 percent command to the damper should theoretically allow 20 percent of the maximum airflow through the damper.
B. Greatly over ventilating the space - This is not necessarily correct. If the damper is set to 20 percent and the system is designed for that minimum ventilation, it should not lead to over-ventilation unless the system is not properly calibrated or if the airflow requirements change.
C. Excessive loads on the boiler in the winter and chiller in the summer - This could be correct. If the damper is not properly controlled or if the system is not designed to handle the outdoor air load efficiently, it could lead to increased heating or cooling loads.
D. Unnecessarily increasing the owner’s utility bills - This could also be correct. If the system is not operating efficiently due to improper damper settings or excessive outdoor air intake, it could lead to higher energy costs.
In summary, the correct options based on the scenario provided would be: