# Energy impact assessment for air-conditioned commercial buildings in Hong Kong

 Author: Shi, Ka-lam Title: Energy impact assessment for air-conditioned commercial buildings in Hong Kong Degree: M.Eng. Year: 2007 Subject: Hong Kong Polytechnic University -- Dissertations.Commercial buildings -- Air conditioning -- China -- Hong Kong.Commercial buildings -- Energy consumption -- China -- Hong Kong. Department: Dept. of Building Services Engineering Pages: xvi, 103 leaves : ill. (some col.) ; 30 cm. Language: English InnoPac Record: http://library.polyu.edu.hk/record=b2117584 URI: http://theses.lib.polyu.edu.hk/handle/200/1126 Abstract: Energy impact of the air-conditioned commercial buildings and satisfaction of occupants are usually determined separately. Since the energy crisis in 1973, engineers have endeavored to implement energy conservation in buildings. Unfortunately, the effort resulted in energy savings without the fundamental delivery of indoor satisfaction in many cases. Hence, it is worthwhile to determine a linkage and balance between the potential energy saving and occupants' satisfaction in office buildings. This dissertation, which based on the simulation results from mathematical models and the reviewed Hong Kong data, demonstrates the energy consumption pattern of the building and discusses the potential saving with respect to occupants comfort. The energy consumption pattern was approximated with a simple and direct mathematical model which allows flexible input of limited amount of building parameters. The model is the by-product of the impact analysis, which benefits building designers in Hong Kong for immediate forecast of thermal energy consumption in buildings. This mathematical model, which results the annual thermal energy consumption for air-conditioned commercial buildings in Hong Kong, includes three universal equations corresponding to the three main components of cooling energy of the buildings, which are the internal load, ventilation load, and fabric load. Each component relies on one multi-regression model. Among these three models, simple regression model for annual fabric energy had not yet been studied. The first part of this thesis determines the annual envelope energy regression model which base on the software simulation data from ECOTECT and obtained the overall thermal energy models with characteristic of buildings and occupants activities in Hong Kong. The second part of the thesis analysis is the energy impact of air-conditioned commercial buildings in Hong Kong by the overall energy models with respect to occupancy satisfaction conditions. This was determined by reviewed Hong Kong data and existed studies on indoor environmental quality (IEQ). The resulted impact assessment and the regression models described in this study may be useful for evaluating energy performance without inclusive complex measurement and promoting energy saving in buildings without any comfort penalty to the occupants.

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