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Air Leakage In Air Handling Units

Air Leakage In Air Handling Units

Cabinet air leakage in an air handling unit (AHU) will lead to parasitic energy losses and degraded building psychrometric performance. Standards such as ASHRAE Standard 90.1 - Energy Standard for Buildings Except Low-Rise Residential Buildings call out leakage rate criteria for duct systems so why not the AHUs themselves?

Basics of Air Filtration

Basics of Air Filtration

Air filters are an essential part of any HVAC system as they allow for the removal of particulate contaminants in the supply air that would otherwise be harmful to the building occupants, or build up in the ductwork or equipment. They are an essential part of air moving devices such as terminal units, fan coils and air handlers as they remove dirt that would otherwise cause coil blockages and fan wheel imbalances.

Building Performance Metrics

Building Performance Metrics

There is a steady and determined march towards designing better and better performing buildings. The only issue with this approach is that actual building performance is not keeping up. At the end of the day, design is not the same as operation.

DV as a Viable Air Solution for Hospital Patient Rooms

DV as a Viable Air Solution for Hospital Patient Rooms

In few environments is the indoor air quality as important as that in hospital patient rooms. The air system must provide protection for the patient, caregiver as well as any visitors that may be in the room. Current codes and standards have been developed with this in mind, often by prescribing an air change rate, thereby ensuring a minimum amount of air movement and purge rate.

Models for Determination of Length of the Adjacent Zone for DV Diffusers

Models for Determination of Length of the Adjacent Zone for DV Diffusers

Displacement ventilation (DV) systems have been widely used in Europe in the last decades. Compared to traditional mixing ventilation, DV systems provide a better indoor air quality and lower the cooling energy consumption by taking advantage of temperature stratification. However, a complaint generally associated with this kind of ventilation system is the draft discomfort it can induce.

Terminal Unit Installation Orientation Considerations

Terminal Unit Installation Orientation Considerations

Price terminals are shipped with an installation orientation sticker and should be installed according to the arrows featured on this sticker. Special considerations must be made if there is a need to reposition the terminal unit to an orientation other than that indicated by the factory label.

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