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In the past three decades, fire engineering has experienced fast development worldwide. Fire regulations for building industry were moved from prescriptive description to performance-based specification. This trend started in the UK in the 1980s and spread to other western countries. Hong Kong closely followed the UK development and adopted the approach of performance-based design (PBD) for the Hong Kong International Airport and MTR stations in the early 1990s. The Government of Hong Kong SAR formally recognised the PBD approach in the prescriptive codes of practice in the mid-1990s and developed the performance-based code (PBC) in the 2000s. This PBC was promulgated in 2011. The evolution in fire engineering impacted the fire community in Mainland China. The State Key Laboratory of Fire Science (SKLFS) was established in University of Science and Technology of China (USTC) in 1991. Then fire science and fire engineering stepped into the fast development track. The building industry in Mainland China started to adopt the PBD approach in the early 2000s for the significant developments including large airport terminals, railway and metro stations, super high-rise buildings, and mega commercial centres. However, a structured PBC system is not available within the regulatory framework to date. Adoption of PBD approach is slowing down in recent years. This paper presents a review of fire engineering development in Hong Kong and Mainland China. The review focuses on the development of the PBC in Hong Kong, and the PBD approach and fire research in Mainland China in the past 30 years. [ABSTRACT FROM AUTHOR]

In Hong Kong, over half of the Protestant churches are located in the upper-floor units in commercial and residential buildings. Because of their physical locations, these churches are sometimes dubbed ‘upper-floor churches’. Unlike those that occupy stand-alone religious buildings or dwell in church-run schools and social service centres, these are often invisible in the landscapes of the city. Through analysis of a case study, this paper aims to explore the spatial practices that a Protestant community has adopted in acquiring, representing, and ritualising a business unit in a residential high-rise for building up their church. Our analysis of the case study shows that in a metropolis like contemporary Hong Kong, the construction of sacred space is full of tensions between utilitarian calculations and concerns of human relations and religious values. While the congregation had been very creative in transforming a commercial unit into a religious site, it did not show much awareness of the oppressive powers of the capitalist market and had a strong tendency to represent its spatial practices as commodities for consumption. [ABSTRACT FROM PUBLISHER]

This paper presents a case study of the prediction, potential and control of plume in wet cooling towers from a huge commercial building in Hong Kong based on the weather data available for a particular year. The power input is found to be lower and the coefficient of performance (COP) moderate when all the 10 towers with low speed are in use, while it is found to be reverse when there are five towers, especially, three low and two high-speed towers are used. It is also found that the combined heating and cooling option can be a better approach than that of the heating option alone from the point of view of thermodynamics as well as from the point of view of economics. The COP of the chillers increases from 6.01 to 7.09 when the number of cooling towers increases from five to ten. On the other hand, the power consumption first decreases and then increases which is mainly due to the increment in the consumption of fan power from 270 to 900 kW for both options. The overall power consumption decreases slightly for the combined heating and cooling option, while in the heating option, the overall power consumption increases slightly. However, it is observed that a proper operation of cooling towers is an effective means to control and/or at least reduce the potential of visible plume generated by wet cooling towers at the existing chilling plant design for this particular building. Copyright © 2006 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

The feasibility of using thermal performance lines to assess the efficiency of using energy in air-conditioned commercial buildings in Hong Kong is being explored. The paper describes a regression study aimed at identifying a suitable climatic variable that would yield linear thermal performance lines for commercial buildings in Hong Kong. The study was based on the monthly electricity consumption of 26 existing office/commercial buildings obtained from a recent survey. Candidate weather parameters considered include monthly mean outdoor temperature, outdoor air moisture content and global solar radiation, and their square and product terms. The regression analysis shows that the square of monthly mean outdoor temperature would be the most appropriate climatic variable. Explanations are also given as to why moisture content and global solar radiation were considered less appropriate, notwithstanding that in Hong Kong, the humidity is high for most of the time in the year and the cooling load due to solar heat gain is a significant component of the design cooling load of air-conditioned buildings. [ABSTRACT FROM AUTHOR]

Abstract: This paper reports the evaluations of energy efficiency, plume potential as well as plume control of a huge chiller plant using water-evaporative cooling towers for heat rejection for a super high-rising commercial office building in a subtropical region of Hong Kong. The evaluations were carried out in a dynamic Transient Simulation Program (TRNSYS)-based simulation platform using alternative control strategies including set-point control logics of the supply cooling water temperature and cooling tower fan modulation control methods as well as different number control means of cooling towers. The results show that different control strategies have significant effects on the energy efficiency of the chiller plant. The quantification of the energy efficiency demonstrates significant energy-saving potential by using advanced technologies for implementing optimal control strategies in this cooling system. The results also reveal that the plume may occur frequently in spring and summer seasons and occasionally in other months due to the odd subtropical weather conditions. Control strategies also have significant effects on the frequency of the plume occurrence. The effective energy efficiency control and effective plume control using wet–dry (i.e., hybrid) cooling towers are also discussed. [Copyright &y& Elsevier]

Purpose - The recession in the late 1990s in Hong Kong has triggered many commercial building owners to cut operation and maintenance (O&M) cost via outsourcing. The purpose of this paper is to investigate the dominant expenditure on O&M service and examine the relation between extent of outsourcing and rental income of the buildings. Design/methodology/approach - Experienced O&M practitioners were interviewed to collect both quantitative and qualitative data of the commercial buildings they looked after. The in-house and outsourced O&M costs, air-conditioning energy costs, rental incomes, and management and air-conditioning fees for the buildings were analysed. Findings - The total air-conditioning O&M cost is the principal cost item, with the energy cost being the dominant element. The analysis reveals that the extent of outsourcing bore little correlation with the air-conditioning O&M cost and the rental income. Research limitations/implications - Further work may take a similar approach to identify the extent and effect of outsourcing other kinds of services that underpin the core business of an organisation. Practical implications - Varying the extent of outsourcing O&M service was found to be unpromising for enhancing rental performance or cutting O&M expenditure. This is an important point that the building managers should address when considering whether to go for outsourcing. Originality/value - The findings imply that in the building O&M service industry, it would be more economical to outsource or undertake in-house the vast majority of O&M work. The focus for cost minimization should be to improve building energy performance rather than reducing labour resources through outsourcing. [ABSTRACT FROM AUTHOR]

Purpose - To explain the recent emergence of the trend of outsourcing for building services operation and maintenance (O&M) work for commercial buildings in Hong Kong and to predict its future development. Design/methodology/approach - Based on economic theories, the authors' understanding of buildings and building services O&M in Hong Kong and information regarding property, companies and manpower statistics, the increasing use of outsourcing is explained with a prediction of its implications for industry stakeholders and future trends. Findings - Reports the common operation and maintenance organization for small, medium and large commercial buildings and explains the relation between outsourcing and the recent economic downturn and sharp cuts in O&M expenditure. Analyses the factors influencing O&M costs and predicts that the trend of outsourcing will continue if contractors keep on upgrading their knowledge and skills to provide quality services more economically than the in-house workforce. Research limitations/implications - The explanation and prediction rely greatly on economic theories and the authors' knowledge and observations from industry, yet the reason for outsourcing and the factors influencing O&M costs are unveiled. Practical implications - The findings have exposed implications for building owners and O&M practitioners as a result of the outsourcing trend, on top of establishing a rigid framework for future practical research in the area. Originality/value - This paper explains the prime motive for outsourcing building services O&M work for commercial buildings, predicts future trends and reveals the implications for stakeholders in the O&M industry in Hong Kong. [ABSTRACT FROM AUTHOR]