DocumentCode
681013
Title
Effect of coolant water and intake air temperatures on thermal efficiency of a spark ignition engine
Author
Kuboyama, Tatsuya ; Moriyoshi, Yasuo ; Iwasaki, Mitsuru ; Hara, Junichiro
Author_Institution
Department of Mechanical Engineering, Chiba University, Japan
fYear
2013
fDate
14-17 Sept. 2013
Firstpage
385
Lastpage
388
Abstract
An improvement of thermal efficiency is strongly demanded for gasoline engines. In this study, experiments were carried out to investigate the effects of intake air temperature and coolant temperature on brake thermal efficiency, heat loss and friction loss in a spark ignition gasoline engine. Experimental results showed that, intake air temperature has a little effect on brake thermal efficiency during partical load operation. During high load operation, a decrease in intake air temperature improved brake thermal efficiency due to an improvement in indicated thermal efficiency and decrease in exhaust loss. It was also revealed that the combination of high temperature cooling water for the engine block and low temperature cooling water for the cylinder heat is effective for improving brake thermal efficiency.
Keywords
Coolants; Engines; Optical pumping; Temperature measurement; Valves; Cooling water temperature; Intake air temperature; Spark ignition engine; Thermal efficiency;
fLanguage
English
Publisher
ieee
Conference_Titel
SICE Annual Conference (SICE), 2013 Proceedings of
Conference_Location
Nagoya, Japan
Type
conf
Filename
6736180
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