Emission characterisation of interior architectural coatings by the use of dynamic environmental chambers

Pao Yue-kong Library Electronic Theses Database

Emission characterisation of interior architectural coatings by the use of dynamic environmental chambers

 

Author: Kwok, Ngai-hong Arnold
Title: Emission characterisation of interior architectural coatings by the use of dynamic environmental chambers
Degree: M.Phil.
Year: 2003
Subject: Hong Kong Polytechnic University -- Dissertations
Paint materials -- Environmental aspects
Coatings -- Environmental aspects
Varnish and varnishing -- Environmental aspects
Department: Dept. of Civil and Structural Engineering
Pages: xxiii, 214 leaves : col. ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1733068
URI: http://theses.lib.polyu.edu.hk/handle/200/155
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.

Files in this item

Files Size Format
b17330683.pdf 19.10Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information