... Engineering, Faculty of Engineering, Mahasarakham University,Thailand2Bio-Energy Research Laboratory (BERL), Division of MechanicalEngineering, Faculty of Engineering, Mahasarakham University, ... oleicacid surfactant in a thermosyphon economizerThanya Parametthanuwat1, Sampan Rittidech1*, Adisak Pattiya2, Yulong Ding3and Sanjeeva Witharana3AbstractThis article reports a recent ... effectiveness of about 0.3 at a filling ratio of 50%, with the nanofluid containing 1 w/v% of OA. It was further found that the effectiveness of nanofluid and theOA containing nanofluids were superior in...