Development of web-based indoor environmental quality (IEQ) calculator

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Development of web-based indoor environmental quality (IEQ) calculator


Author: Zhou, Yang
Title: Development of web-based indoor environmental quality (IEQ) calculator
Degree: M.Eng.
Year: 2013
Subject: Indoor air pollution -- Measurement.
Indoor air pollution -- Evaluation.
Air quality management.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: ix, 79 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record:
Abstract: Indoor environmental quality (IEQ) is closely related to occupants' health and working efficiency, and the importance has been realized by modern people gradually. Mathematical equations of evaluating IEQ have been proposed by previous studies, but the practical applicability of these equations has not been validated. Meanwhile, it is not easy to evaluate IEQ with these mathematical equations. The current study was therefore designed to validate the practical applicability of these mathematical equations and develop a web-based IEQ calculator to evaluate IEQ easily. Computational fluid dynamics (CFD) simulation was used to predict the velocity field and temperature field in the classroom CD 302 of The Hong Kong Polytechnic University. The correctness of the simulation was validated by the field measurement data in the previous study. The results of analyzing literature data and CFD simuluation show that environmental conditions (air temperature, air velocity, CO₂ concentration, sound pressure level, illuminance level) at measurement sites can represent the environmental situation at these sites' surrounding areas. Meanwhile, environmental conditions of occupants' peripheral areas were approximate, so the conclusion of environmental parameters at one measurement site that near occupants can be used to evaluate occupants' perception about the IEQ of the whole classroom was drawn. Therefore, the practical applicability of these mathematical equations was validated. The graphs of mathematical equations were plotted, and domains of independent variables were extended to adapt to any environmental conditions of classrooms. The graph of mathematical equation of illumiance environment showed that this equation was not suitable for evaluating occupants' perception of indoor illuminance level, instead illuminance level was used directly to evaluate indoor illuminance environment. A web-based IEQ calculator was developed by Language C based on mathematical equations. The range of operative temperature (t0), carbon dioxide concentration (φ), sound pressure level (Leq) and illuminance level (E) in the web-base calculator which worked as indicators for acceptable IEQ were: 21.5≤t0≤28.2; Φ≤1000 ppm; Leq≤60 dBA; E≥500 lux. Correspondingly, ranges of the solutions of mathematical equations for acceptable IEQ were: 0.787≤θ1≤0.897; θ2≤0.836; θ3≤0.95. If environmental parameters fall within these ranges, the web-based calculator will output "IEQ ACCEPTABLE", if not, will output "IEQ UNACCEPTABLE". This web-based calculator can be used for evaluating IEQ of classroom conveniently, by just inputting measured representative environmental parameters (air temperature, CO₂ concentration, sound pressure level and illuminance level), outcome will be displayed.

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