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Analysis of thermal parameters of heat storages for use in vehicles with combustion engines

Mężyk Przemysław, Przybyła Grzegorz, Petela Karolina

Combustion Engines

2019

R. 58, nr 4

119--125

The propulsion system of a vehicle using an internal combustion engine generates a significant amount of waste heat during operation, which is almost entirely discharged into the environment without any useful effect. One of the ways of using waste heat is storing it, and then using, for example, when starting the engine in winter conditions. The application of the indicated solution, in particular for the combat vehicle will allow to reduce the effects of cold start and will shorten the time of preparing such a vehicle for combat operations. The article presents: types of heat accumulators that could be used in a military vehicle, the results of preliminary tests carried out on the test stand and the impact of an additional heat source on the time of heating the internal combustion engine and on emission of exhaust gas components.

Identification of waste heat energy sources of a conventional steam propulsion plant of an LNG carrier

Adamkiewicz Andrzej, Grzesiak Szymon

Archives of Thermodynamics

2019

Vol. 40, no 3

195--210

This paper presents the origins of marine steam turbine application on liquefied natural gas carriers. An analysis of alternative propulsion plant trends has been made. The more efficient ones with marine diesel engines gradually began to replace the less efficient plants. However, because of many advantages of the steam turbine, further development research is in progress in order to achieve comparable thermal efficiency. Research has been carried out in order to achieve higher thermal efficiency throughout increasing operational parameters of superheated steam before the turbine unit; improving its efficiency to bring it nearer to the ideal Carnot cycle by applying a reheating system of steam and multi stage regenerative boiler feed water heating. Furthermore, heat losses of the system are reduced by: improving the design of turbine blades, application of turbine casing and bearing cooling, as well as reduction in steam flow resistance in pipe work and maneuvering valves. The article identifies waste energy sources using the energy balance of a steam turbine propulsion plant applied on the liquefied natural gas carrier which was made out basing on results of a passive operation experiment, using the measured and calculated values from behavioral equations for the zero-dimensional model. Thermodynamic functions of state of waste heat fluxes have been identified in terms of their capability to be converted into usable energy fluxes. Thus, new ways of increasing the efficiency of energy conversion of a steam turbine propulsion plant have been addressed.

Marine Turbine Application In Waste Heat Recovery Systems

Adamkiewicz A., Wietrzyk B.

Journal of Polish CIMAC

2009

Vol. 4, no 1

7-16

This study shows an analysis of a ship power plant with waste heat recovery systems – Thermo Efficiency System (TES) with main engine exhaust gases utilization and exhaust power gas and steam turbines application. The systems were compared each other. The energetic efficiency in chosen waste heat recovery systems was compared. The advantages and disadvantages of turbines application in waste heat recovery systems were listed in a summary.