A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

The objective of this study was to propose a stratification control method for the minimum air flow of a variable air volume (VAV) terminal unit. The minimum air flow rate of the VAV terminal unit is the key factor affecting thermal comfort, indoor air quality (IAQ), stratification and energy consum...

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Bibliographic Details
Published in:Journal of Asian architecture and building engineering 2015, Vol.14 (2), p.467-474
Main Authors: Kim, Hyo-Jun, Kang, Su-Hyun, Cho, Young-Hum
Format: Article
Language:English
Subjects:
Air flow
Buildings
Computer simulation
Energy consumption
Indoor
Stratification
Terminals
Thermal comfort
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Summary:The objective of this study was to propose a stratification control method for the minimum air flow of a variable air volume (VAV) terminal unit. The minimum air flow rate of the VAV terminal unit is the key factor affecting thermal comfort, indoor air quality (IAQ), stratification and energy consumption depending on the operating mode of the VAV system. Therefore, selecting the proper minimum air flow is very important. In this study, a building simulation was conducted to evaluate the indoor thermal comfort, stratification, IAQ and energy consumption according to the fixed minimum air flow rate of the VAV terminal units. In addition, an algorithm was proposed considering the stratification and variable minimum air flow rate depending on the indoor load. The results of the fixed minimum air flow rate simulation showed that the minimum air flow rate considering stratification satisfies all the conditions of indoor thermal comfort, IAQ and without stratification. The proposed method was found to be more effective than the existing control method. The energy comparison with the existing control method showed that the proposed method reduces the energy consumption.
ISSN:1346-7581
1347-2852
DOI:10.3130/jaabe.14.467