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Proceedings of the University of Vaasa. Reports 3 Figure 1. Thermodynamic cycles and their temperature range, after (Koro- bitsyn, 1998) Of the various combined cycles, the Joule (Brayton) and steam Rankine combined cycle is the most developed and wide-spread. Inexpensive and readily available media, such as air for the topping cycle, and water/steam for the bottoming cycle, and well-developed technologies (gas turbine, waste heat boiler, steam turbine) have led to wide acceptance of this configuration. (Korobitsyn 1998) The term Combined gas and steam turbine power plant is often used in this context. Regardless of their high brake thermal efficiencies, diesel and gas engines also produce waste heat. Basically, there are four engine waste heat streams that can be recovered by a bottoming cycle: exhaust gas charge air jacket water, and lubricating oil. (Jonsson & Yan 2001) The waste heat rejected through the exhaust gas represents a large fraction of the fuel’s energy (Taylor, 2008). Several modern diesel engines are equipped with exhaust gas recirculation (EGR) to control NOx emissions. High EGR rates re- quire effective cooling of recirculated gas. This heat rejection has a temperature level suitable for an effective WHR system. (Teng et al, 2011) Suitable bottoming cycles for diesel and gas engine are the Rankine, Brayton, Kalina, and Stirling cycles (Korobitsyn 1998).PDF Image | Waste Heat Recovery Bottoming Cycle Alternatives
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