The Science of ComfortTM
A variable air volume (VAV) diffuser is essentially a ceiling diffuser with a built-in VAV damper and thermostat. Despite its simplicity, this device comes with many benefits and is an effective way to create small-zone comfort for building occupants.
Topics: GRD, Diffusers, Thermal Comfort, HVAC Fundamentals, HVAC, Engineering, Design Engineering
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
In modern buildings, the heating, cooling, and ventilation systems consume a large portion of the total energy use. This creates an obvious target when looking for areas where improvements and optimizations can reduce annual energy consumption. Costs associated with these improvements can be reduced year over year. Within the HVAC system, the largest consumer of energy will typically be fan energy. Using hydronic systems to transport heating or cooling energy throughout a building is a great way to dramatically reduce the overall energy consumption of the entire HVAC system.
Topics: Beams, System Efficiency, HVAC Fundamentals, HVAC, Engineering, Design Engineering, Tech Tip
The fan column is a vertical fan unit designed to discharge air into a raised access floor plenum. The unit may be likened to an air handler as it mixes filtered, cooled return air with pre-treated outside air typically from a dedicated outdoor air system (DOAS) to achieve the design supply air temperature, then discharge the mixed air into the raised access floor plenum.
Topics: Underfloor, HVAC Fundamentals, Engineering, Design Engineering, Tech Tip
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