Determination of non-standard part-load value coefficients for chiller in several cities of Indonesia

There is a common misconception that all central systems are only operating in full-load conditions where in fact, most central systems are have the control system that can adjust the operating condition with the cooling loads. Customers tend to choose the air conditioning systems based only on full-load ratings despite a system may have different ratings on different load profiles. These differences can result in more expensive annual energy cost. The goal of this research is to develop an equation to provide customers with the part-load efficiency ratings of central air conditioning system (chiller) as an addition to full-load efficiency ratings provided by air conditioner companies. Non-standard Part Load Value (NPLV) is an equation to obtain part-load efficiency of a system which coefficients vary with location of interest. In this paper, NPLV for city of Jakarta, Bandung, Pontianak, Kupang, and Palembang were determined by Degree-Hours Method and Radiant Time Series Method. The results are compared and discussed.