Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/45890
Title: Tracer gas measurement of airflow rates in spaces with several air-handling units, recirculation, or large time constants
Authors: Roulet, C.-A.
Zuraimi, M.S.
Sekhar, S.C. 
Tham, K.W. 
Issue Date: 2006
Source: Roulet, C.-A.,Zuraimi, M.S.,Sekhar, S.C.,Tham, K.W. (2006). Tracer gas measurement of airflow rates in spaces with several air-handling units, recirculation, or large time constants. HVAC and R Research 12 (3) : 477-496. ScholarBank@NUS Repository.
Abstract: Methods to measure airflow rates using tracer gas in single air-handling units are well known. In some buildings, however, in particular in Singapore, rooms are often ventilated with two or more units and present large recirculation rates. Large recirculation ratios homogenize the concentrations, so concentrations in supply and extract ducts are close to each other. In addition, these spaces often present a large time constant, so much time is needed to reach steady state. The purpose of this paper is to document an adapted methodology to measure not only the airflow rates provided by each unit but also the inter-unit airflow rates and the global ventilation efficiency, The method is illustrated with an example of measurement in an actual building. It is shown that the most accurate method is not the same for small and large recirculation ratios.
Source Title: HVAC and R Research
URI: http://scholarbank.nus.edu.sg/handle/10635/45890
ISSN: 10789669
Appears in Collections:Staff Publications

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