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 correct. A 20 percent damper opening should not lead to over-ventilation if the system is designed for that minimum ventilation requirement.
C. Excessive loads on the boiler in the winter and chiller in the summer - This could be correct. If the damper is allowing outdoor air in at a rate that is not balanced with the system's heating and cooling capacity, it could lead to excessive loads on the heating and cooling systems.
D. Unnecessarily increasing the owner’s utility bills - This is also correct. If the system is not properly balanced and is bringing in more outdoor air than necessary, it can lead to increased energy consumption and higher utility bills.
Therefore, the correct answers are **A, C,