Abstract
A constant minimum airflow rate is used in conventional Single Duct Variable Air Volume Terminal Box control sequences. This control sequence can cause occupant discomfort or use excessive energy under partial load conditions. If the minimum airflow rate is higher than required; terminal boxes will have significantly more simultaneous heating and cooling; and AHUs will consume more fan power. Buildings will have indoor air quality problems if the minimum airflow rate is less than required. Many engineers and researchers have investigated advanced variable air volume terminal box control algorithms without a system retrofit for thermal comfort; indoor air quality and energy savings. In this study a developed control system with variable minimum airflow rate for Single Duct Variable Air Volume Terminal Boxes was applied and validated using an actual building and evaluated for comfort; indoor air quality and energy consumption. The energy consumption and thermal performance of terminal boxes using the conventional and proposed control algorithms were compared.
Highlights
Single duct variable air volume (VAV) air-handling units (AHUs) are the most popular system in the USA
The objective of this study is to develop s terminal control system with the variable minimum airflow rate of Single Duct VAV Terminal Boxes and apply and validate it with an actual building and evaluate it for comfort, indoor air quality (IAQ) and energy consumption performance
In 1989, the ventilation rates established by ASHRAE Standard 62-1989 [11] increased substantially over those previously required by the 1981 version of the standard
Summary
Single duct variable air volume (VAV) air-handling units (AHUs) are the most popular system in the USA. Terminal boxes are a critical component in VAV systems. The minimum airflow rate of terminal boxes is a key factor for user comfort, indoor air quality (IAQ) and energy costs. A constant minimum airflow rate is used in conventional control sequences. This control sequence can cause occupant discomfort or use excessive energy. If the minimum airflow conditions are not optimal in terms of energy efficiency, terminal boxes will have significantly more simultaneous heating and cooling cycles and AHUs will consume more fan power. Buildings will have IAQ problems if the minimum airflow rate is less than required
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