Abstract
The objective of this study was to propose a control method with a ventilation requirement of variable air volume (VAV) system in multi-zone. In order to control the VAV system inmulti-zone, it is essential to control the terminal unit installed in each zone. A VAV terminal unit with conventional control method using a fixed minimum air flow can cause indoor air quality (IAQ) issues depending on the variation in the number of occupants. This research proposes a control method with a ventilation requirement of the VAV terminal unit and AHU inmulti-zone. The integrated control method with an air flow increase model in the VAV terminal unit, AHU, and outdoor air intake rate increase model in the AHU was based on the indoor CO2 concentration. The conventional and proposed control algorithms were compared through a TRNSYS simulation program. The proposed VAV terminal unit control method satisfies all the conditions of indoor temperature, IAQ, and stratification. An energy comparison with the conventional control method showed that the method satisfies not only the indoor thermal comfort, IAQ, and stratification issue, but also reduces the energy consumption.
Highlights
Buildings account for 25%, or more, of the entire amount of domestic energy consumption
The minimum air flow rate of the variable air volume (VAV) terminal unit is a chief factor that has a direct influence on indoor heat comfort, indoor air quality (IAQ), and energy consumption
According to the existing VAV terminal unit control, indoor temperature, alone, is controlled using a fixed minimum air flow rate, and IAQ can be affected by the change in the number of occupants
Summary
Buildings account for 25%, or more, of the entire amount of domestic energy consumption. Mid-sized and large buildings continue to increase in energy consumption. These days, the reduction of greenhouse gases by energy saving is highlighted as an important issue. Building facility systems should be operated to make sure that energy is used and saved efficiently. The variable air volume system (VAV system) is adopted in many large buildings with increasing interest in energy saving and various studies have been performed for its efficient operation [1]. A terminal unit is located in the end terminal that supplies air conditioned air to each zone, which makes it necessary to control a terminal unit in each zone in order to control a VAV system in multi-zone
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