Analysis on Thermal Measuring of Rooftop Farming Garden A Case Study of Julong Residential District in Zhongshan

摘要

Nowadays, many urban cities in the world are facing problems of urban heat island and lack of greenery space. Rooftop farming is a strategy for intensifying urban agriculture activities, which can not only improve nutrition and food security in urban neighborhoods, but also reduce the energy consumption of air-condition and ease the power shortage in urban area of metropolitan regions. In this study, a thermal experiment and an index of energy saving analysis were carried out in Zhongshan, Guangdong Province, China in August 2011, measuring external and internal surface temperatures of roofs with and without greening, using the same set of climate parameters. The experiment results show that the green roof with urban farming can contribute to the modulation of air temperature in the interior spaces of building. During the hot days in summer, the external surface temperatures of green roof are lower than the normal flat one. The result also reveals that external surfaces of vegetated green roof system could effectively lower surface temperature by 6°C and save 18.7% electric power, comparing with the general flat roof of traditional building.