Bojic, M; Yik, F and Lee, M (2003) Influence of air-conditioning exhaust on exterior recessed space. Building Research & Information, 31(1), pp. 24-33. ISSN 0961-3218
Abstract
Recessed spaces are essential for high-rise residential buildings in Hong Kong. During the summer, they allow the discharge of heat from residential air-conditioners; throughout the year, they enable natural lighting and natural ventilation. Investigations are reported on the dynamic flow inside a 30-story-high recessed space for different amounts of waste heat (different sizes of cooled rooms) by window-type air-conditioners. Predictions based on a computational fluid dynamics code showed that when waste heat per air-conditioner is R = 2 kW, mechanical cooling is efficient (coefficient of performance, COP ≅ 3.1). However, when the waste heat increases, a buoyant air stream inside the recessed space becomes hotter and more powerful. Condenser units draw hotter air from this air stream, and their efficiency drops. In addition, this air stream strongly obstructs airflows through condenser units and natural ventilation through flats. The usability, efficiency and comfort of buildings will benefit from an enhanced understanding of the dynamic relationships between the configuration of the recessed exterior space, the amounts of waste heat discharged into it and the configuration of internal rooms.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | air-conditioners; heat rejection; high-rise residential buildings; Hong Kong; recessed spaces; temperature rise |
| Index terms: | usability, coefficient of performance, efficiency, Hong Kong, stream, window, natural ventilation, high-rise residential building, summer, configuration, comfort, investigation, computational fluid dynamics |
| Subjects: | modelling and simulation, energy systems, construction type, data collection methods, user-centered design, climate science, occupational health and safety management, systems engineering, environmental engineering, architectural elements, performance management, Geography, water management |
| Topics: | Construction Technology, Sustainability, Health and Safety, Geographical Context, Research Practice, Engineering Principles, Design Practice, Digital Applications, Quality Management |
| Descriptive scope: | 3 PCA |
N.B. Descriptive scope is a count of how many of the five facets of empirical research are indicated by the words used in title, abstract and keywords. It is not intended as a judgement on the research; merely a count of the kind of word we would expect to indicate Phenomenon, Concepts, Theoretical framing, Empirical techniques, Analytical techniques. If all five are present, then a code of “5 PCTEA” will indicate this. If you feel the coding for this record is questionable, we welcome discussion around the terms we matched or the way we categorized them. The facet you would expect may not be coded, or a facet may be coded inappropriately. This can also bear on a larger question, of which facets should be treated as defining in construction management research. Please get in touch, and we will look at it. More details here