Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2803
Title: Emission characterisation of interior architectural coatings by the use of dynamic environmental chambers
Authors: Kwok, Ngai-hong Arnold
Keywords: Hong Kong Polytechnic University -- Dissertations
Paint materials -- Environmental aspects
Coatings -- Environmental aspects
Varnish and varnishing -- Environmental aspects
Issue Date: 2003
Publisher: The Hong Kong Polytechnic University
Abstract: Emission characterisation is determine to find the emission rates, changes in emissions over time and the potential indoor pollutant concentrations. The purpose of emission characterisation is to evaluate the sampling and analysis methods for identifying and quantitating chemical species in air samples. Indoor architectural coatings are well recognised as sources for volatile organic compounds (VOCs) and hydrocarbons. The resulting build-up of emissions poses a serious threat to the health and comfort of building occupants. Emissions from indoor architectural coatings depend on a variety of factors. They include those related to the materials themselves (emitting source factors) and those related to the environment within which they are tested (environmental factors). Investigation on the effects of these factors on emissions is, therefore, one appropriate measure for understanding the corresponding impact on the indoor air quality. The amount of VOC and NMHC emissions from two types of interior architectural coatings together with the factors affecting the emission rate measurement are investigated. The correlations between the emission rates and those factors are developed. Environmental chamber testing is proposed to evaluate the emissions from a finishing varnish and an alkyd paint. The major VOCs emitted from the interior architectural coatings were mainly aromatics, namely toluene, chlorobenzene, ethylbenzene, styrene, xylene isomers, and trimethylbenzene isomers. The results showed that the general profiles of the emissions were quite similar and showed rapid changes in the initial emission characteristics. The results indicate that the emission rates become higher when the wet film is thicker and the size of specimen is smaller. Emission rates from painted inert substrate were higher than those from painted real substrate. The results also indicate that increased air exchange rate, temperature and RH level increase the emission rate, which are consistent with theoretical predication far gas-phase, mass transfer-controlled emissions. The emitting source factors (e.g. thickness and material loading) influence significantly on the VOC and NMHC concentration, while the environmental factors (e.g. temperature and relative humidity) influence significantly on the initial VOC and NMHC emissions. The present work confirmed that both the emitting source and environmental factors influenced noticeably the VOC and NMHC emissions. Emission source empirical models, first-order decay and double-exponential models, are proposed in the present study, to be intended to describe the time dependence of VOC and NMHC emission in the environmental test chambers with relatively few parameters, and to evaluate the effectiveness of emission reduction options. The models consider the effect of air exchange rate, source strength and material loading on the emission. The non-linear squared correlation coefficients (R²) and the sum of the squared error (SSE) showed that the models had closely described the measured values. With these emission source models, the concentrations and emissions in indoor air under specific conditions can be predicted.
Description: xxiii, 214 leaves : col. ill. ; 30 cm.
PolyU Library Call No.: [THS] LG51 .H577M CSE 2003 Kwok
URI: http://hdl.handle.net/10397/2803
Rights: All rights reserved.
Appears in Collections:Thesis

Files in This Item:
File Description SizeFormat 
b17330683_link.htmFor PolyU Users 161 BHTMLView/Open
b17330683_ir.pdfFor All Users (Non-printable) 18.67 MBAdobe PDFView/Open
Show full item record

Page view(s)

405
Last Week
3
Last month
Checked on Oct 22, 2017

Download(s)

157
Checked on Oct 22, 2017

Google ScholarTM

Check



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.