THE EFFECT OF HOT WATER FLOW RATE IN THE SOLAR COLLECTOR FLOW LOOP AT SOLAR THERMAL COOLING SYSTEM NASRUDDIN (*), ARNAS (**), ALHAMID M. I.(*), SAITO K.(***), YABASE H.(****) (*) Department of Mechanical Engineering, Faculty of Engineering, University of Indonesia, Indonesia, (**) Graduate School of Fundamental Science and Engineering, Waseda University, Japan, (***) Faculty of Science and Engineering, Waseda University, Japan, (****) Energy Solution Engineering Department, Kawasaki Thermal Engineering Co., Ltd., Japan