An evaluation of the design rules of thumb for estimating cooling load in office buildings in Hong Kong

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An evaluation of the design rules of thumb for estimating cooling load in office buildings in Hong Kong

 

Author: Lao, Tung-han Stephen
Title: An evaluation of the design rules of thumb for estimating cooling load in office buildings in Hong Kong
Degree: M.Sc.
Year: 2000
Subject: Office buildings -- Air conditioning -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: xiii, 202 p. : ill. (some col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1523553
URI: http://theses.lib.polyu.edu.hk/handle/200/3819
Abstract: It is a common practice in building services design for designers to draw on their experience for rapid assessment of the approximate value of system design parameters and costs. This accumulated experience manifests itself as a set of guidelines or rules - known colloquially as "Rules of Thumb". In Hong Kong, however a publicly available set of such rules applicable to building services design does not seem to exist. On the other band, local designers often tend to propose high value of rules of thumb to allow for so-called safety margin. This makes over-sizing a common practice in building services systems in Hong Kong. In this project, existing rules of thumb employed by a number of leading local consultants were collected and then evaluated by manual calculation, computer simulation and field measurement approaches. The evaluation results indicated that, for exterior zone the rule of thumb adopted by the industry could provide acceptable load estimation, with, on average, about 20% over estimation, however, load estimation by using the rule of thumb could be as high as 76% above actual load intensity in the worst case. For interior zone, the rule of thumb produces even poorer estimation. The mean estimation by rule of thumb is already 89% above the actual load intensity and, in the worst case, 177% above the actual. This may lead to significant over-sizing the HVAC system and result in increased equipment size and, installation and operating cost. Based the results from this study, new compromised design rules of thumb for estimating cooling load in office buildings are proposed, taking into consideration of energy efficiency, safe/flexible system design and operation, and peak loading conditions.

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