Planning and Urban Design for a Liveable High-Density City

This topical paper constitutes part of the research series under “Hong Kong 2030+: Towards a Planning Vision and Strategy Transcending 2030” (Hong Kong 2030+). The findings and proposals of the paper form the basis of the draft updated territorial development strategy which is set out in the Public Engagement Booklet of Hong Kong 2030+.

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Daytime urban heat island effect in high-rise and high-density residential developments in Hong Kong

by R. Giridharan, S. Ganesan, and S.S.Y. Lau

Nearly 60% of electrical energy use in Hong Kong is for space conditioning during summer months. The paper investigates the impact of design-related variables on outdoor micro level daytime heat island effect in residential developments in HongKong. The paper hypothesizes that the differences in outdoor temperatures within and between residential developments can be explained by the impact of design-related variables on the overall environment. Case studies of three large housing estates reveal urban heat island effect (UHI) in the order of 1.5 ◦C within an estate, and 1.0 ◦C between estates. The results indicate that energy efficient designs can be achieved by manipulating surface albedo, sky view factor and total height to floor area ratio (building massing) while maximizing cross ventilation.

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Low energy building design in high density urban cities

Sam C.M. Hui

Abstract

This paper investigates the concept of low energy building, examines how urban density might affect building energy design in high density cities, and discuss the strategies for low energy building design in densely populated areas. Using Hong Kong as a case study, the characteristics of dense building development and the major factors affecting low energy building are evaluated. The approaches taken in Hong Kong to accommodate its growing population provide an interesting background for understanding the constraints and potential of low energy design. The energy situation in Hong Kong is explained and the major considerations for energy efficiency in high density conditions are discussed. It is hoped that the research findings would contribute useful information for designing methods to achieve low energy building in a complex and dense urban environment.

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Hong Kong, photo by whitecat singapore

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Do We Really All Have To Live Like New Yorkers? Does Density Matter?

by Lloyd Alter 

07.27.10

Reading David Owen's The Green Metropolis, one would conclude that density is everything, that New York is, as he wrote in the New Yorker, "The Greenest City in America":

"Barring an almost inconceivable reduction in the earth's population, dense urban centers offer one of the few plausible remedies for some of the world's most discouraging environmental ills. To borrow a term from the jargon of computer systems, dense cities are scalable, while sprawling suburbs are not. The environmental challenge we face, at the current stage of our assault on the world's non-renewable resources, is not how to make our teeming cities more like the pristine countryside. The true challenge is how to make other settled places more like Manhattan."

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