Engine Cooling System Design and Development
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Abstract:
Engine cooling is a complex multi-stage process of which only the latter stages, that of heat exchange between water and air, are considered. Cooling system performance targets as air temperature to boil values are indicated. The relationship between engine heat rejection to the coolant, radiator matrix specific dissipation and air temperature to boil is established in a form suitable for simple calculations. Measurement of cooling system quantities and performances of individual components requires suitable test rigs and a full size vehicle wind tunnel. Data acquired from such measurements provides the basis for the application of an analytical approach to the design and development of cooling systems to achieve given cooling performance targets in the most economical manner. A computer programme, capable of embracing the wide range of cooling system parameters, is seen as the most effective way of fully examining both new and alternative designs.Keywords:
Radiator (engine cooling)
Active cooling
Thermoelectric generators (TEGs) have the ability to convert waste heat into electrical energy under unfavorable conditions and are becoming increasingly popular in academia, but have not yet achieved a broad commercial success, due to the still comparably low efficiency. To increase the efficiency and economic viability of TEGs, research is performed on the materials on one hand and on the system connection on the other. In the latter case, the net output power of the cooling system plays a key role. At first glance, passive cooling seems preferable to active cooling because it does not affect the net electrical output power. However, as shown in the present review, the active cooling is to be preferred for net output power. The situation is similar in air and water-cooling. Even though air-cooling is easier to set up, the water-cooling should be preferred to achieve higher net output power. It is shown that microchannel cooling has similar hydraulic performance to conventional cooling and inserts increase the net output power of TEG. As the review reveals that active water-cooling should be the method of choice to achieve high net output power, it also shows that a careful optimization is necessary to exploit the potential.
Thermoelectric cooling
Active cooling
Thermoelectric generator
Computer cooling
Passive cooling
Net (polyhedron)
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With more and more stringent requirements for miniaturization and high power density in electric power devices,the research and analysis on the thermal problems become particularly important.In this paper,the theories for the thermal analyses on power devices are introduced,and the physical model for rectifier modules cooling system is proposed.The Finite Element Method(FEM) is determined as the analysis method,by which the temperature field of an air-cooling radiator is calculated numerically.Based on the analysis,the basic operating process of ANSYS software in handling such thermal problems is summarized.Considering the overall distribution of the rectifier modules on one air-cooling radiator,temperature fields of air-cooling radiators with two different shape fins are simulated.Based on the comparisons of the heat transfer affections in such different air-cooling radiators,a new-type practical structure for air-cooling radiator is proposed.
Radiator (engine cooling)
Rectifier (neural networks)
Active cooling
Evaporative cooler
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The cooling mechanisms of water cooling, evaporation cooling and air cooling are introduced. In practical application the evaporation cooling and air cooling both can combine with water cooling to save water and acquire good economic benefits.
Evaporative cooler
Free cooling
Active cooling
Air water
Passive cooling
Chiller
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Abstract : An engine cooling system affects overall performances of an engine which has been recently requested higher power in more confined engine room. The design of efficient cooling system demands a great effort to effectively correlate with each components, such as water jacket, radiator, coolant pump, cooling fan, etc. Thus, the aim of this study is to provide the design tool of the cooling system in the early design stage by enabling for the designer to accurately predict the engine cooling performances. This user-friendly design tool has various ways to assemble each components and control the running condition with related database. The present design tool was simulated and compared with experimental data. As a result, the inlet and outlet temperature of the radiator agree very well with experiments. It was concluded that the present design tool could be effectively used for the design of the engine cooling system. Key words : Engine cooling system(엔진 냉각 시스템), Thermal radiation analysis(방열 해석), Heat transfer analysis(열 전달 해석), Coolant flow analysis(냉각수 해석), Simulator(시뮬레이터)
Radiator (engine cooling)
Active cooling
Automotive engine
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Citations (6)
The paper presented methods for calculating cooling air flow of automobile engine cooling system using test results of vehicle and parts of engine cooling system.The factors that affect cooling air flow were analyzed and used in the calculation revising.All these will aid analysis on the performance of engine cooling system.
Automotive engine
Active cooling
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Citations (0)
The research was an advantageous quest of improvement on and design traditional cooling system.According to cooling water temperature,it formed intellectualized control cooling system combining with motor-driven control of cooling fan.Consequently,it realized the rotating speed of fan automata with engine working status,and assures that cooling water temperature keeps in the best range all the time and advances the reliability of engine working and realized exact control of cooling water temperature in deed.
Active cooling
Fan coil unit
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The results are presented of an experimental investigation of heat transfer in an air-liquid cooling system for a Switch-Mode Power Supply (SMPS) for TV digital power amplifiers. Since these SMPSs are characterized by high power and high compactness, thereby making the standard cooling techniques difficult to be used, a new cooling system is developed, using water and air as the cooling media. The active components (MOSFETs) are cooled with a liquid cold-plate, the passive ones (condensers, transformers, coils) with an air flow, in turn cooled by the cold-plate. By inserting the cooling system in an experimental tool where it is possible to control the cooling water, measurements are made of temperature in the significant points of the SMPS. The electric efficiency is also measured. The evaluation of the thermal performance of this cooling system is useful in order to limit its maximum operational temperature. The efficacy of the cooling system is demonstrated; the trends of efficiency and power dissipation are evidenced.
Computer cooling
Active cooling
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Citations (8)
As the facilty which has cooling load at all times has increased, using the free-cooling system is increasing. The free cooling system is able to drop room temperature by cooling water heat exchanged outdoor air. In this study, the performance characteristics of free cooling system is analyzed and compared energy consumption of free cooling system with existing system's. The main result is as follows. In case that the temperature of outdoor air is under 2℃, It is able to handle cooling load by operating dry-cooler solely. But cooling system should be operated when the temperature of outdoor air is over 2℃. The effectiveness of free cooling system appeared between November and March. Comparing free cooling system with existing system, energy can be saved about 15% annually. It is resonable to apply the free cooling system to the facilities having cooling load constantly.
Free cooling
Active cooling
Cooling load
Passive cooling
Evaporative cooler
Cooling capacity
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The three types of motor cooling system of large bulb tubular pump unit,open forced air-cooling and outer water-cooling,closed forced circular air-cooling and outer water-cooling and stator water-cooling and rotor air-cooling,were analyzed and compared from the aspects of the system's safety,economy,maintenance and so on.Results indicate that open forced air-cooling and outer water-cooling system has the best installation,maintainability and reliability,closed forced circular air-cooling and outer water-cooling system makes the motor's temperature rise symmetrically and prolong the motor's insulated life,stator water-cooling and rotor air-cooling system has low cooling expenses and the best cooling effect.The results could provide references to design and select motor cooling system.
Active cooling
Water cooled
Evaporative cooler
Maintainability
Passive cooling
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The article examines the specifics of solving one of the problems of low-speed marine engines, during which low-temperature corrosion of cylinder liners occurs during operation at minimum and partial load modes. An overview of the cooling systems of ship's main engines was conducted and possible prospects for improving the cooling systems of ship's diesel engines were considered. Attention is paid to the causes and methods of combating low-temperature corrosion of ship's main engines. The methods of regulating the cooling system of marine diesel engines were considered, and it was determined that the modern concept of regulation in the cooling system should include both automatic regulation of operational parameters due to the installation of frequency-regulated cooling system pumps, and regulation of the water-chemical parameters of the cooling system. Methods of regulating the operating parameters of the pumps in the cooling system of the ship's main engine were also considered, which use the principle of frequency regulation of centrifugal pumps to ensure the modes of operation with the highest efficiency. Thus, frequency regulation is an energy-efficient way of regulating centrifugal pumps with variable coolant flows in ship engine cooling systems and one of the ways to maintain an optimal temperature state. The possibility of modernizing the cooling system of cylinders of low-speed engines according to the principle of the LDCL system to reduce the impact and occurrence of low-temperature corrosion was considered
Active cooling
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