1 Cooling Effect by Vertical Greenery System in a High Rise Building and Surroundings Badrulzaman Jaafar 1 , Ismail Said 2 and Mohd Hisyam Rasidi 3 1 Phd Candidate, 2 Associate Professor and Senior Lecturer 3 Department of Landscape Architecture, Faculty of Built Environment Universiti Teknologi Malaysia Badrazj@gmail.com Abstract Greening the wall of the building facade, known as vertical green system (VGS), has not been fully explored and exploited. Therefore, the widespread use of VGS not only reduces the potential impact of UHI in evapotranspirasi and shade, but it is also a transformation that affects the urban landscape. VGS appears to be a sensible strategy for greening cities, given the preponderance of wall space that is available in urban canyons. Such as green roofs, VGS is expected to reduce the heat, energy consumption and improve the cooling effect on the area around the building. It also has the potential to provide a larger space for the plants may be available on the external walls of buildings in urban areas, and plants growing on the walls can cause a vertical view of the green. The main purpose of this paper is to present research methods and approaches proposed to study the suitability of design and technology for cooling the building and surrounding areas. The effect of design parameters on the microclimate of the building and the cooling technology is discussed. A detailed study of the information revealed that apart from refrigeration, the study design green vertical system, evaluation of many factors such as physical structure, the dimensions of the main panel of species of plants and substrate, type of substrate, composition and moisture content affect the performance of the vertical green. Therefore, the use of VGS is possible to produce a cooling effect on the surface of the building and its surroundings. Experiment and simulation are recommended to confirm the success. In conclusion, the results of this study will help in elucidating the complex interactions between various parameters and the role played by each factor individually and together in the urban built environment. Keywords: Vertical greenery system, cooling effect, urban heat island, plant 1. Introduction In today‟s world, the rapid pace of urbanization and the growing concern for climate change have led to the increasing trend of bringing nature back into cities (Chiang and Tan, 2009). Greenery has become a key element of urban transformation and the exterior surfaces of buildings have been deemed to hold vast opportunities for the insertion of greenery into urban-spaces; planting on roofs and walls has since become one of the most innovative and rapidly developing features of city planning, architecture and ecological landscaping (GRHC, 2008). Demand for office and housing space in ever diminishing land space has led to taller and taller buildings reaching for the skies in cities around the world. This shortage of land in many cities has unfortunately also led to a scarcity of natural vegetation in urban settings. If this situation is not handled properly, there would be an uncomfortable environment for local residents. Due to artificial urbanization, urban heat island has become a serious problem. Greenery is expected to be an effective countermeasure, and much research is available regarding green roofs, green walls, street trees, parks and woodland. Urban heat island is the effect of the increase measured in the ambient air temperature resulting primarily from the replacement of vegetation with buildings, roads and other infrastructure to absorb heat. Heat island effects can cause significant temperature differences between urban and rural areas (EPA, 2008). Heat island phenomenon can occur during the day or night. Givoni (1998) mentions that the greatest height of urban temperatures occur during the night was still clear and the air. In this case, the temperature elevation of about 3- 5 ° C are common, but the ascent of about 80-10 ° C is also observed. Today, the majority of the cities is around 2 ° C warmer than rural areas and commercial areas and high density residential is warmer by 5 to 7 ° C (Bonan, 2002). There are several key parameters that influence the temperature rise in the cities and play an important role in it. Therefore, urban heat islands caused by other factors can be divided into two types: (1) weather factors, such as cloud cover, wind speed and humidity, and the city parameters (2) such as city and population size, heat and anthropogenic effects of urban canyons.