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- W2395356129 abstract "To prevent global warming, the social need to improve the thermal efficiencies of engines and thereby reduce CO 2 emissions is being increasingly acknowledged. As a comprehensive engine manufacturer, Mitsubishi Heavy Industries, Ltd., (MHI) has been working on various technological developments to address the increased demand for dealing with environmental and energy issues regarding clean emission gases and reduced CO2 output. This paper outlines MHI’s approaches to improving the thermal efficiency of small and large diesel and gas engines to enable the clean and effective use of fuel oil and natural gas as valuable human assets. 1. Outline of the development and high-efficiency performance of engines MHI has developed and currently manufactures piston engines, with the world’s widest output, ranging from small gasoline engines (less than 1 kW) to large, low-speed diesel engines (68 MW class). Moreover, MHI is a comprehensive engine manufacturer that produces major components such as exhaust turbochargers and fuel injection systems. These are used in engines for a wide range of products, including vehicles and ships, various mobile industrial machines, and cogeneration and electricity generation equipment. Thus, MHI plays an important role in supporting worldwide economic development. However, piston engines have encountered environmental and energy problems, such as air pollution caused by exhaust gas and global warming caused by CO2 emissions. The company is striving to utilize and evolve its wide technological capabilities toward solving these problems, and is working on developing engines that respond to the diverse and sophisticated needs of its customers. In view of its improved thermal ef f iciency, which is directly related to reduced CO2 emissions, a piston engine is inherently advantageous in its working principles and characteristics. In a piston engine, a sequence of strokes, including compression, combustion, and expansion, takes place repeatedly within one cylinder, making up a hightemperature pressure cycle. The maximum temperature constraints of the working media inside the cylinder are not very severe due to the unsteady cyclic combustion. A piston engine has another advantage in that its thermal losses can be reduced because of the slow gas flow, leading to higher thermal efficiencies. This will be discussed below. As a result, the highest thermal efficiencies are realized in smallto medium-sized engines, as shown in Fig. 1." @default.
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- W2395356129 date "2008-01-01" @default.
- W2395356129 modified "2023-09-27" @default.
- W2395356129 title "Approach to High Efficiency Diesel and Gas Engines" @default.
- W2395356129 hasPublicationYear "2008" @default.
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