Design and Optimization of Compact Heat Exchangers to be Retrofitted into a Vehicle for Heat Recovery from a Diesel Engine

Abstract

Higher depletion rate and increasing price of fossil fuels have motivated many researchers to harness energy from the waste heat from internal combustion engines, and thus improve the overall efficiency. Among the waste heat recovery methods, the bottoming Rankine cycle is the most promising. In this technique, the recovered heat is used to produce additional power using turbine. In order to maximise the additional power production, an effective heat exchanger design is necessary. The main focus of the current research was to design heat exchangers which needed to be pancake-shaped to be retrofitted into a vehicle. The heat exchanges chosen were shell and U-tube type. CFD simulations were carried out to optimize the design of the heat exchangers and calculate the additional power that could be achievable by using this optimized pancake-shaped heat exchangers.

Developing and testing air-fuel mixture heating system for internal combustion engine

“…The experimental unit operates in such a way that the movement of the piston (16) in the engine cylinder (19) creates negative pressure in the following parts of the supply system: the air filter (9), the carburettor (8), the HEX air-fuel mixture channel (14), the inlet manifold (15), and the engine cylinder (19). Under negative pressure the fuel is sucked in from the carburettor's (8) float chamber (11), through the nozzle (12), and into the carburettor throat (10), and an air-fuel mixture is formed. The carburised air-fuel mixture then moves to the HEX's (13) air-fuel mixture channel (14), in which the air-fuel mixture will be complementary mixed and heated.…”

“…The technical specifications, the design of the engine, and the technological pre-limits must be taken into account when developing the supply system [10]. The tube and plate-shaped HEX [11] are suitable for heating the air-fuel mixture, but in tube-type solutions the air-fuel mixture channel becomes longer. Therefore, the egine reaction time increases, depending upon the engine load, and engine volumetric efficiency decreases.…”

Development of heat exchange reactor for preparation of air-fuel mixture in spark ignition engine

“…For a spark-ignition internal combustion engine it is possible to use two types of heat exchangers, i.e. tubeshape and plate heat exchanger [18]. Development of a tubeshape heat exchanger requires in particular the identification of problems that may occur when making improvements to the fuel mixture preparation system of the spark-ignition internal combustion engine.…”

The Influence of Thermal Insulation Types on the Efficiency of the Heat Exchanger Operation in the System of Mobile Compressor Unit Thermal Losses Recovery

“…Актуальность поставленной цели обусловлена тем, что вся энергия, генерируемая в ДВС и затрачиваемая на сжатие газа в мобильной компрессорной установке, выбрасывается в окружающую среду в виде тепла. Рекуперация этой тепловой энергии обратно в установку в механической форме представляет собой актуальную научно-техническую задачу [5][6][7][8][9][10][11][12][13][14]. Известно, что рекуперация данных тепловых потерь может позволить вдвое увеличить производительность установки и уменьшить расход топлива на её привод.…”