According to the US Department of Energy, HVAC energy consumption costs make up anywhere from 35% to 50% of a building’s total energy expenses (depending on type of business). Couple that with more than 50% of all commercial floor space is conditioned by Light Commercial HVAC systems, and businesses have a major problem with HVAC and energy costs.
WIND CAN SIGNIFICANTLY INFLUENCE AN HVAC SYSTEM
Most Light Commercial units do not have devices in place to compensate for things like wind pressure, hysteresis, damper binding and actuator slippage on the OA intake. Wind can significantly influence the amount of fresh air entering the building and cause too much OA into a space. In turn, energy costs could sky-rocket since the system would not be operating at the desired efficiency levels while conditioning far too much OA.
DAMPERS BINDING CAN CAUSE SERIOUS ISSUES
Hysteresis is the inability of an object to return to the same position. When the dampers modulate in accordance with the climate conditions or predetermined schedules, they are unable to reset back in the same place. So, it is conceivable that there could be a lot more OA entering the unit than you realize, causing the system to work harder to condition the air and increase energy costs.
Dampers could bind or actuators could slip as well, and there would be no way to know unless you had someone go on the roof everyday (obviously not a realistic solution). Just like with hysteresis, this issue could cause serious issues to energy consumption and expense.
All of these factors could lead to serious over-ventilating, which would lead to drastic energy expenses.
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