Determination of Time Variant 1D-3D Temperature and Heat Transfer Distribution Inside the Cooling Jacket of a SI Engine Cooling System after Key-Off

2012 ◽  
Author(s):  
Md. Hazrat Ali ◽  
Masjuki Hassan ◽  
Md. Kalam ◽  
Suh Chyn Pang ◽  
Liaquat Memon ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Cooling System ◽  
Si Engine ◽  
Engine Cooling ◽  
Cooling Jacket

scholarly journals THE RESEARCH OF THE WORK OF THE HEAT ACCUMULATOR OF THE PRE-STARTING SYSTEM OF WORMING UP OF THE INTERNAL COMBUSTION ENGINE

2020 ◽  
Vol 42 (3) ◽  
pp. 76-83
Author(s):  
K. Lunyaka ◽  
O. Kliuiev ◽  
S. Rusanov ◽  
O. Kliuieva
Keyword(s):  
Heat Transfer ◽  
Heat Storage ◽  
Cooling System ◽  
Storage Material ◽  
Heat Accumulator ◽  
Operating Modes ◽  
Engine Cooling ◽  
Cooling Agent ◽  
Heat Storage Material ◽  
Engine Coolant

Problem statement. Starting internal combustion engines for a large car fleet at ambient temperature of less than 5 ºС requires considerable time; it leads to increased wear of the components of the connected engine pairs, increased fuel consumption during start-up and warm-up and increased emissions of harmful substances into the atmosphere with exhaust fumes. Therefore, prestart warming up   of car engines is given great attention. Actual scientific researches and issues analysis Recently, this problem has been solved by using heat accumulators, moreover, heat accumulators with heat storage material of a phase transition are given preference. The engine exhaust gases (temperature 600-700 ºС) or the engine cooling liquid (water,                 tosol cooling agent) are used as a heat transfer agent. Given the negative impact of high temperatures on the heat storage material, the metal of the heat storage structure and overheating (boiling) of the engine coolant, the first way has certain disadvantages. In this regard, we consider it more promising to use a liquid cooling engine as a coolant for a heat accumulator. High temperatures have no positive affect on the heat storage material, the metal of the heat storage structure and these are a cause for boiling a coolant –cooler of the engine. In this regard, we consider more promising to use a cooling fluid of the heat accumulator as a heat transfer agent. The aim of this work is to develop a new design of a heat accumulator for pre-starting warming up of a car engine, to make the experimental installation to research its work and conducting researches in order to find the time of charging and discharging of the heat accumulator, to construct operating modes during charging and discharging, to determine the necessary mass of the heat-accumulating material and the battery size. Base material The experimental installation was a closed system: the heat accumulator — a passage of the VAZ 2109 car engine cooling system. Taking into account the work peculiarities of the heat accumulator in the cooling system of the car engine, unlike other areas where all mass of the heat storage material constantly is in contact with the substance which the heat storage material giving up heat, in our case, the engine cooling liquid is located in the heat accumulator and in the cooling jacket. They mixes before starting the engine, while its temperature decreases. The time of charging and staying of the heat accumulator in the charged state has been determined, the operating modes during charging and discharging have been constructed, the necessary mass of the heat-accumulating material and the battery size has been determined.  Conclusions The experimental model of the heat accumulator of the pre-starting system of worming up of the engine of the car has been developed. This experimental model is included in a closed circuit with engine cooling system. On the model the researches of charging and discharging process of the heat accumulator have been conducted. The required time for these processes has been determined and on this basis the modes of operation of the heat accumulator - engine cooling system have been constructed. The temperatures of tosol cooling agent in the cooling system were calculated and it allowed finding mass (volume) of heat storage material of the heat accumulator and it served as the basis for determining the size of the heat accumulator. Establishment of a computerized control system on/off control of the heat accumulator in order to maintain the desired temperature of the engine coolant liquid using of heat storage material of phase transition and controlling this system using supplements to phones.

Determination of the Thermal Conductivity of Metal-Polymers

2019 ◽  
Vol 973 ◽  
pp. 9-14 ◽  
Author(s):  
Mikhail S. Chepchurov ◽  
Nikolay S. Lubimyi ◽  
Vladimir P. Voronenko ◽  
Daniel R. Adeniyi
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Heat Transfer Coefficient ◽  
Injection Molding ◽  
Transfer Coefficient ◽  
Cooling System ◽  
Using Data ◽  
Measuring Tool ◽  
The Heat Transfer Coefficient

The use of metal-polymers in the manufacture of mold-forming parts allows for the significant reduction in price and time used in manufacturing of parts. Using data on the thermal conductivity of metal-polymers in calculations of the cooling system of molds allows calculating the optimal cycle of obtaining the product. The authors propose a method of determining the coefficient of heat transfer of metal-polymers based on a die matrix, filled with aluminum. The chosen equipment or measuring tool by them, allows determining the heat transfer coefficient of the material in use. The values of the coefficient of heat transfer of the material in question, obtained in the course of the research can be use in different databases of applications used for modeling production by injection molding. The described method of determining the coefficient of heat transfer may be repeated for samples of metal-polymers.

scholarly journals Hydrogen Containing Nanofluids in the Spark Engine’s Cylinder Head Cooling System

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 59
Author(s):  
Alexander Balitskii ◽  
Myroslav Kindrachuk ◽  
Dmytro Volchenko ◽  
Karol F. Abramek ◽  
Olexiy Balitskii ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Cylinder Head ◽  
Base Fluid ◽  
Mass Concentration ◽  
Thermal Conductivity Coefficient ◽  
Cooling System ◽  
Cooling Systems ◽  
Engine Cooling ◽  
Head Cooling

The article is devoted to the following issues: boiling of fluid in the cooling jacket of the engine cylinder head; agents that influenced the thermal conductivity coefficient of nanofluids; behavior of nanoparticles and devices with nanoparticles in the engine’s cylinder head cooling system. The permissible temperature level of internal combustion engines is ensured by intensification of heat transfer in cooling systems due to the change of coolants with “light” and “heavy” nanoparticles. It was established that the introduction of “light” nanoparticles of aluminum oxide into the water in a mass concentration of 0.75% led to an increase in its thermal conductivity coefficient by 60% compared to the base fluid at a coolant temperature of 90 °C, which corresponds to the operating temperature of the engine cooling systems. At the indicated temperature, the base fluid has a thermal conductivity coefficient of 0.545 W/(m °С), for nanofluid with particles its value was 0.872 . At the same time, a positive change in the parameters of the nanofluid in the engine cooling system was noted: the average movement speed increased from 0.2 to 2.0 m/s; the average temperature is in the range of 60–90 °C; heat flux density 2 × 102–2 × 106 ; heat transfer coefficient 150–1000 . Growth of the thermal conductivity coefficient of the cooling nanofluid was achieved. This increase is determined by the change in the mass concentration of aluminum oxide nanoparticles in the base fluid. This will make it possible to create coolants with such thermophysical characteristics that are required to ensure intensive heat transfer in cooling systems of engines with various capacities.

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