Developing a credit weighting scale for a building environmental assessment scheme

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Developing a credit weighting scale for a building environmental assessment scheme

 

Author: Leung, Chi-lung
Title: Developing a credit weighting scale for a building environmental assessment scheme
Degree: M.Eng.
Year: 2005
Subject: Hong Kong Polytechnic University -- Dissertations
Buildings -- Environmental aspects
Buildings -- Performance -- Evaluation
Department: Dept. of Building Services Engineering
Pages: x, 101, 31 leaves : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1810020
URI: http://theses.lib.polyu.edu.hk/handle/200/4676
Abstract: The credit weighting scale is the heart of all building environmental assessment scheme since it will dominate the final eco-profile of the building being assessed. There are currently two credit weighting allocation strategies available, namely End Point Approach (EPA) and Expert Subjective Weighting (ESW). EPA is considered the most appropriate method for the allocation of credit. However, it can only be applied successfully for the credit allocation within the same issue. Due to this limitation, researchers tend to use ESW for setting the weighting scale among issues. Given that the opinions may vary with different groups of people, the weightings allocated by this method may not come up with a consistent result. In this study, a new credit weighting allocation strategy, the Analytical Hierarchy Process (AHP) was used to replace the ESW method. This method can provide more consistent results since the consistency of the weightings can be checked. Also, a new credit weighting allocation procedure was developed which can provide a reliable credit weighting scale in the building environmental assessment scheme. The pilot version of Hong Kong Building Environmental Assessment Method for new building (HK-BEAM 4/03) was used as an example to show the development of the credit scale for a building environmental assessment scheme using the new credit allocation strategy. The study uses three questionnaire surveys to gather opinions from practitioners about the allocation of weighting for different environmental criteria in HK-BEAM 4/03. The first one is on the scope of the scheme. The second and the third one are to collect professionals' views on the relative weighting between criteria and sub-criteria. The findings indicate that Sustainability issue is to be added to the revised HK-BEAM 4/03. Also, the credit weighting scale across different issues was formulated using the AHP approach. The credit weighting within the same issue was established by the ESW method. Besides that, three energy sub-criteria were converted to the end point impact using the EPA. As a whole, the credit weighting scale for the HK-BEAM 4/03 were formulated and revised using the three credit weighting allocation strategies. Moreover, a general procedure for the credit weighting allocation in the building environmental assessment scheme was developed. This procedure can give a more consistent result and form a good basis for policy makers in formulating the credit weighting across different issues in building environmental assessment schemes.

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