An evaluation data of solar irradiation and dry bulb temperature at Subang under Malaysian climate

Solar irradiation and the temperature played a major role in the PV designing system. This factor differs with the latitude, geographic and time of day due to the various sun positions. This paper presents an average of solar irradiation over 10 years data for the Subang area with respect to the complete set data of daily global solar radiation that monitored by the Malaysian Meteorological Department (MMD) from year 1993 to 2002. In this study, the data were analysed to understand the pattern of hourly solar irradiance and also to recommend the appropriate value of daily solar irradiation for the designing of PV system in Malaysia region especially for Subang and Klang Valley. The highest sum of 24 hours average solar irradiation per year was 4.72 kWh m−2 in 1998 as well as temperature 28.5 °C and the annually average solar irradiations for Subang were collected from 3.91 kWh m−2 to 4.30 kWh m−2 during 10 years period. Also, the recommended daily solar irradiation in Malaysian climate is 4.39 kWh m−2, 133.0 kWh m−2 for monthly and the standard value for annual is 1596.5 kWh m−2. The standard deviation for daily solar irradiation is 0.29.