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    Part Load Performance Characteristics of a Low-Heat Rejection Diesel Engine Fueled with Biodiesel
    (ASCE-AMER SOC CIVIL ENGINEERS, 2011) Hasimoglu, Can; Ciniviz, Murat; Parlak, Adnan; Ozsert, Ibrahim; Icingur, Yakup
    This experimental study focused on improving performance characteristics of a low-heat rejection (LHR) diesel engine operating with biodiesel fuel. To ensure LHR conditions, the cylinder head and valves of the test engine were coated with a Y(2)O(3)-ZrO(2) (yttria-stabilized zirconia) layer of 0.35 mm thickness over a NiCrAl bond coat of 0.15 mm thickness. The fuel used in the engine tests was produced from sunflower oil with transesterification methods. The engine test results showed that brake-specific fuel consumption (BSFC) and brake thermal efficiency were improved with biodiesel usage and thermal barrier coating (TBC) application. Further, exhaust gas temperature was decreased with use of biodiesel, while it was increased with TBC application. DOI: 10.1061/(ASCE)EY.1943-7897.0000037. (C) 2011 American Society of Civil Engineers.
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    Performance characteristics of a low heat rejection diesel engine operating with biodiesel
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) Hasimoglu, Can; Ciniviz, Murat; Oezsert, Ibrahim; Icinguer, Yakup; Parlak, Adnan; Salman, M. Sahir
    Vegetable oils are a promising alternative among the different diesel fuel alternatives. However, the high viscosity, poor volatility and cold flow characteristics of vegetable oils can cause some problems such as injector coking, severe engine deposits, filter gumming, piston ring sticking and thickening of lubrication oil from long-term use in diesel engines. These problems can be eliminated or minimized by transesterification of the vegetable oils to form monoesters. These monoesters are known as biodiesel. The important advantages of biodiesel are lower exhaust gas emissions and its biodegradability and renewability compared with petroleum-based diesel fuel. Although the transesterification improves the fuel properties of vegetable oil, the viscosity and volatility of biodiesel are still worse than that of petroleum diesel fuel. The energy of the biodiesel can be released more efficiently with the concept of low heat rejection (LHR) engine. The aim of this study is to apply LHR engine for improving engine performance when biodiesel is used as an alternative fuel. For this purpose, a turbocharged direct injection (DI) diesel engine was converted to a LHR engine and the effects of biodiesel (produced from sunflower oil) usage in the LHR engine on its performance characteristics have been investigated experimentally. The results showed that specific fuel consumption and the brake thermal efficiency were improved and exhaust gas temperature before the turbine inlet was increased for both fuels in the LHR engine. (c) 2007 Elsevier Ltd. All rights reserved.