ANALYSIS OF CLIMATE THERMAL COMFORT USING PHYSIOLOGICALLY EQUIVALENT TEMPERATURE (PET) IN JAKARTA

Thermal comfort level needs to be analyzed because it can affect human activity and productivity regarding to climate change issue now days. One recent study to generate thermal comfort index is Physiologically Equivalent Temperature (PET). Not only using climate parameters, PET also considers the human energy balance that derived from short and long wave radiation and also human activity. This study aimed to determine the climatic thermal comfort and its trend in Capital City of Jakarta, as one of the most populous city in Indonesia. The daily data of average air temperature (°C), maximum temperature (°C), relative humidity (%), wind velocity (m/s), and cloud cover (octas) during period of 1992 – 2012 were collected from 6 rainfall stations around Jakarta. PET calculated by Rayman application and the trend evaluated with Mann-Kendall test. The result showed that climatic thermal comfort in Jakarta was comfortable (69%) with no thermal stress in most area except Curug and Kemayoran which were dominantly slightly cool. Thermal comfort during daytime indicated all areas over Jakarta were dominated by slightly warm condition (45%) where slight heat stress might appear even about 36% of daytime faced heat stress in most area. Monthly patterns showed that Jakarta has 2 peaks of PET occurred on May and October where the lowest of PET occurred on July. The average of PET showed Pondok Betung as the warmest and Curug as the coolest. Mann Kendall test indicated that PET significantly tend to increase with time in most area