Chiller plant optimization with considering the thermal comfort with the use of IES

Pao Yue-kong Library Electronic Theses Database

Chiller plant optimization with considering the thermal comfort with the use of IES

 

Author: Cheung, Man Him Eric
Title: Chiller plant optimization with considering the thermal comfort with the use of IES
Degree: M.Eng.
Year: 2015
Subject: Architecture and energy conservation.
Office buildings -- Air conditioning.
Work environment -- Psychological aspects.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: 62 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2826116
URI: http://theses.lib.polyu.edu.hk/handle/200/8212
Abstract: Climate change has become an increasing concern for the environment on a global scale, and here in Hong Kong, it has been recognised as an issue that needs to be dealt with urgently. One major concern is the electricity consumption that gives rise to carbon emissions, where buildings consume 90% of the city's overall electricity usage and more than 50% of this is for the central air conditioning systems required for the sub-tropical climate. Air-conditioning is essential in order to keep building occupants thermally comfortable and more importantly to ensure the productivity of employees, as it has been proven that thermal comfort has a direct effect on productivity. Thus, this study aims to investigate the relationship between indoor thermal comfort and indoor design temperature that may lead to potential energy and cost savings from the central air conditioning plant. With the use of building energy software, Integrated Environmental Solution (IES), the maximum tolerable indoor design temperature of a typical office environment is investigated whilst not compromising the level of indoor thermal comfort in terms of Predicted Mean Vote (PMV). The minimum allowable indoor dry bulb temperature has been stipulated in the BEC2012 as 23 degC and it has become a standard design temperature that most building developers typically use. However, is 23 degC the most energy efficient temperature to provide a thermally comfortable working area within an office building? In answer to this question, a number of scenarios are defined to test the maximum indoor design temperature from 23 degC up to 24.5degC. Results from the simulations show that even at 24.5degC, building occupants would still be able to work comfortably and thus not hinder productivity, and the temperature difference of 1.5 degC also leads to approximately 12.8% reduction in peak cooling load and energy consumption and subsequently provide an approximate HKD 36,898,414.3 of annual cost saving in terms of electricity tariff.

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