Engineering Research Seminar Series 28, 2011: Effectiveness of an R-134a-filled Thermosyphon Heat Pipe Heat Exchanger

Assoc. Prof. Ong Kok Seng, lecturer from School of Engineering, Monash University Sunway Campus

Date: 2011-08-15
Time: 14:00 to 15:00
Venue: Classroom 6-3-10


The effects of evaporator and condenser air velocities and inlet temperatures on the overall effectiveness of an R-134a filled thermosyphon heat pipe heat exchanger (THPHE) was experimentally investigated. Condenser air velocity ranged from 1.17 - 1.63 m/s and evaporator velocity from 0.845 - 2.14 m/s. Air conditioned cold air for the condenser side air flow was taken from the outlet of a Hilton air conditioning trainer. Evaporator side air flow was taken from the ambient and electrically heated with finned electrical resistance heating elements in the duct. It was observed that the effectiveness was minima at capacity rate ratio equal to about 1. The results also showed that the effectiveness increased as air velocities and evaporator inlet temperature decreased. Effectiveness also increased as condenser inlet air temperature decreased.

About the Speaker

Ong KS retired as Professor and Deputy Dean of the Engineering Faculty, University of Malaya after 27 years of service (1971 – 1998). He is currently attached to Monash University Malaysia as Associate Professor in the Mechanical Engineering Department. His research activities are on the field of Solar Energy, Heat Pumps, Heat Pipes, Drying, Air conditioning and Refrigeration. He has authored more than 130 papers in International Journals. Dr Ong holds professional qualification from Fellow of Institution of Engineers, Malaysia (FIEM), Fellow of Institution of Mechanical Engineers, UK. (FIMechE), Registered Professional Engineer Malaysia (PEng) and Chartered Engineer UK (CEng).