The Science of ComfortTM
Fan-powered terminal units use a motor and blower assembly to handle high levels of external static pressure, which enables the product to serve long duct runs and multiple air outlets. Using a motor within an assembly allows for smaller air handling units and gives the terminal unit the ability to tolerate variability in the heating and cooling requirements of exterior zones.
Topics: Terminals, HVAC Fundamentals, HVAC, Engineering
Terminal units influence a building occupant’s experience through heating, cooling and acoustics. Price offers attenuators and silencers as two different methods to reduce a terminal unit’s operating sound level. An attenuator reduces sound levels by utilizing a section of duct lined with acoustical media whereas a silencer utilizes both baffling and acoustical media to break sound waves and reduce the sound level leaving the unit. Although attenuators may suit a project depending on its acoustical requirements and pricing, silencers offer optimal sound reduction.
Topics: HVAC Silencers, Terminals, HVAC Fundamentals, HVAC
Pressure drop – the difference in pressure between two points in a fluid-carrying system – is one of the most critical design considerations for air distribution equipment in the HVAC industry. The problem with pressure drop for terminal units is that there are a number of metrics that are often confused with one another despite referring to different performance variables. These include static pressure drop, velocity pressure drop, pressure drop associated with acoustics and pressure drop associated with accessories.
Topics: Pressure Drop, Terminals, HVAC Fundamentals, HVAC, Engineering, Design Engineering
Water-to-air heat exchangers are commonly used throughout commercial HVAC systems. The amount of fluid flowing through a coil directly influences the temperature exchanged to the air, which ultimately impacts the thermal comfort of those in the space. Both the type and size of piping package components are important to ensure that the overall system is running efficiently and to optimize thermal comfort.
Topics: Terminals, HVAC Fundamentals, HVAC, Engineering, Design Engineering
Air filters are an essential part of any HVAC system to remove particulates in the supply air that would otherwise be harmful to the building occupants, or build up in the ductwork or equipment. They are also 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.
Topics: Terminals, System Efficiency, HVAC Fundamentals, HVAC, Training, Handbook, Engineering Update, Critical Environments
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