Improvement of urban thermal environment by managing heat discharge sources and surface modification in Tokyo

This paper analyzes the implications of anthropogenic heat discharges into the urban thermal environment of Tokyo. Heat discharges by the representative office, commercial and residential buildings were simulated with the help of the DOE-2 building energy simulation model. The approach used in this paper also takes into account the heat storage within building structures. The geographical information system based technique was used to estimate the heat discharge distribution all over Tokyo. The mesoscale analyses of the urban climate were carried out with a model that was based on the Colorado State University Mesoscale Model. The improvements in the urban thermal environment via the various measures were analyzed for two types of scenarios, namely, scenarios related to the management of heat discharge sources and urban surface modifications. The maximum improvement in average temperature for daytime was found to be 0.47°C (at noon) as a result of greening the areas around the buildings of Tokyo. Similarly, the maximum improvement in average temperature for the evening was found to be 0.11°C by discharging all heat to the ground.

[1]  俊明 一ノ瀬.  International symposium on monitoring and management of urban heat island, proceedings, Fujisawa, November 19-20, 1997, in Shonan campus, Keio University , 1997 .

[2]  T. S. Saitoh,et al.  Modeling and simulation of the Tokyo urban heat island , 1996 .

[3]  T. Oke,et al.  The energy balance of central Mexico City during the dry season , 1999 .

[4]  Hashem Akbari,et al.  Peak power and cooling energy savings of high-albedo roofs , 1997 .

[5]  A. Rosenfeld,et al.  Practical issues for using solar-reflective materials to mitigate urban heat islands , 1998 .

[6]  Keisuke Hanaki,et al.  Impact of anthropogenic heat on urban climate in Tokyo , 1999 .

[7]  Clifford F. Mass,et al.  Numerical Investigation of Mesoscale Circulations over the Los Angeles Basin. Part I. A Verification Study , 1990 .

[8]  Y. Kuo,et al.  Description of the Penn State/NCAR Mesoscale Model: Version 4 (MM4) , 1987 .

[9]  Roger A. Pielke,et al.  A Three-Dimensional Numerical Model of the Sea Breezes Over South Florida , 1974 .

[10]  Toshio Ojima,et al.  Changing Tokyo Metropolitan area and its heat island model , 1990 .

[11]  H. Taha.  Urban climates and heat islands: albedo, evapotranspiration, and anthropogenic heat , 1997 .

[12]  H. Akbari,et al.  Long-term performance of high-albedo roof coatings , 1997 .

[13]  Keisuke Hanaki,et al.  Thermal environment simulation for three dimensional replacement of urban activity , 1999 .

[14]  I. Uno.  Quantitative Evaluation of a Mesoscale Numerical Model Simulation Using Four-Dimensional Data Assimilation of Complex Airflow over the Kanto Region in Japan , 1996 .

[15]  Fujio Kimura,et al.  The effects of land-use and anthropogenic heating on the surface temperature in the Tokyo Metropolitan area: A numerical experiment☆ , 1991 .

[16]  Haider Taha,et al.  Modeling the impacts of large-scale albedo changes on ozone air quality in the South Coast Air Basin , 1997 .