Paper 15: Recent Research and Development in Truck Engine Cooling

1969 ◽  
Vol 184 (1) ◽  
pp. 117-124 ◽  
Author(s):  
S. R. G. Taylor
Keyword(s):  
Coolant Temperature ◽  
Analytical Prediction ◽  
Cooling Performance ◽  
Pump Speed ◽  
Power Characteristics ◽  
Engine Cooling ◽  
System Pressure ◽  
Component Design ◽  
Additional Resistance ◽  
Water Pumps

To improve economically the cooling performance of trucks an analytical approach was used to assist development. The component tests undertaken included the complete net pressure and power characteristics of two engine water pumps and four engine fans, the heat transfer and pressure drop performances over appropriate flow ranges of some 14 radiators, the additional resistance to air flow offered by two noise shields, and studies of the effects of pump speed, coolant temperature, system pressure, thermostat resistance, and by-pass resistance on radiator water flow with three different engines. The apparatus and methods used for each type of test are outlined. Using the above and other existing data, cooling performance was predicted for some 80 different configurations and conditions, and fan power consumption was predicted for several of these. These results enabled component design and manufacturing problems to be identified and the selection of the most promising configurations for actual development testing. The agreement between the predicted and actual cooling performances is discussed. The use of computer programmes in component testing and analytical prediction is mentioned, and various possible developments in future cooling systems of still higher performance are discussed.

scholarly journals Development and Research of the Adaptive Cooling System with an Electric Pump

2021 ◽  
Vol 39 (2) ◽  
pp. 638-642
Author(s):  
Ermakov Andrey ◽  
Salakhov Rishat ◽  
Khismatullin Renat ◽  
Idiatullin Bulat
Keyword(s):  
Energy Savings ◽  
Cooling System ◽  
Combustion Engine ◽  
High Energy ◽  
Coolant Temperature ◽  
Pump Speed ◽  
Operating Modes ◽  
Engine Cooling ◽  
Low Load ◽  
Dimensional Simulation

This paper studies the effect of the electrically-driven pump on improving the efficiency of internal combustion engine cooling systems. Numerical one-dimensional simulation of the system operation was performed according to the European transient cycle (ETC). The paper compares the cooling system with a belt-driven pump and electrically-driven pump. It was found that the electrically-driven cooling system not only could maintain a more stable coolant temperature, and also provided energy savings for the pump drive. It can be noted that the mechanically-driven cooling system has disproportionately high energy costs, unstable coolant temperature, so in case of sudden changes in operating modes, the built-in thermostat cannot keep it within two degrees Celsius. At high engine speeds and low load, the drive consumes too much power, and when thermostat is faulty and the coolant is overcooled, at low speeds and high load, the coolant is overheating. The paper also considers options with electric-driven pump with and without an enabled thermostat. With a working thermostat and electrically driven pump, the system consumes a little more energy, because the thermostat does not open fully and as a result, the pump speed is 8.2% higher than in a cooling system without a thermostat.

scholarly journals Multi-level inverter for driving PV water pumps

2020 ◽  
Vol 27 (4) ◽  
pp. 62-71
Author(s):  
Danny Ibrahim ◽  
Kais Aboud
Keyword(s):  
Conversion Efficiency ◽  
Carrier Wave ◽  
Pump Speed ◽  
Constant Torque ◽  
Voltage Wave ◽  
Multi Level ◽  
Inverter Circuit ◽  
Power Point ◽  
Water Pumps ◽  
Electronic Elements

In this research, we have developed a system for driving PV water pumps based on multi-level inverters, where cascaded H-Bridge-MLI was studied to improve conversion efficiency, by testing three different strategies to generate pulses for electronic elements and determining the best strategy between them, then compare it with the traditional 2-LEVEL inverter circuit.  The results showed the superiority of Phase Disposition (PD-PWM) strategy, where the THD Ratio of the voltage and current wave was minimal compared to the other strategies at different carrier wave frequencies in addition to studying the effect of the number of voltage levels on THD Ratio, and when we simulated a three phase (Cascaded H-Bridge 7 level) inverter circuit based on PD-PWM strategy at 3000 Hz carrier wave frequency, the THD Ratio of voltage wave has not exceed 11%, While in the traditional 2-LEVEL inverter, the THD Ratio of voltage wave is about 66%, which shows the importance of MLI to improve conversion efficiency. The proposed driving system operates according to the v / f control system to control the pump speed in proportion to the intensity of the solar radiation while maintaining a constant torque, and also works to track the maximum power point MPPT according to P&O algorithm, and when we simulated the system by MATLAB / SIMULINK the results showed the effectiveness and reliability of the proposed system

Film Cooling Superposition Theory for Multiple Rows of Cooling Holes With Multiple Coolant Temperatures

2020 ◽  
Author(s):  
Matthew N. Fuqua ◽  
James L. Rutledge
Keyword(s):  
Film Cooling ◽  
Classical Method ◽  
Fluid Dynamic ◽  
Coolant Temperature ◽  
Double Row ◽  
Design Work ◽  
Cooling Performance ◽  
Film Cooling Effectiveness ◽  
Different Temperatures ◽  
Cooling Hole

Abstract The classical method of superposition has been used for several decades to provide an estimate of the adiabatic effectiveness for multiple sets of already well-characterized film cooling hole rows. In this way, design work is aided by classical superposition theory prior to higher fidelity experiments or simulations that would account for fluid dynamic interaction for which superposition cannot account. In the present work, we consider the additive effects of multiple rows of coolant holes, but now also with coolant issuing at different temperatures. There are a number of ways that coolant may issue from different cooling hole rows at different temperatures, one of which is simply the necessarily different internal channels through which the coolant must pass. The film cooling effectiveness is investigated for double rows of cooling holes wherein the two rows have different coolant temperatures. A double row consisting of an upstream slot and a downstream row of 7-7-7 cooling holes were first evaluated with a single coolant temperature to demonstrate that classical superposition theory applies well to the present configuration. Superposition theory is then extended to the context of multiple coolant temperatures and a new non-dimensional parameter is identified, which governs cooling performance. The theory is experimentally evaluated by independently varying the coolant temperatures of the two rows. Circumstances are identified in which a second row of cooling holes may be detrimental to cooling performance.

Influence of Steam Generator Tube Bundle Vibrations on the Operating Diagram of a Nuclear Plant During Stretch Out

2006 ◽  
Author(s):  
Andre´ Adobes ◽  
Joe¨l Pillet ◽  
Franck David ◽  
Michae¨l Gaudin
Keyword(s):  
Steam Generator ◽  
Cooling System ◽  
Tube Bundle ◽  
Thermal Power ◽  
Nuclear Plant ◽  
Coolant Temperature ◽  
Primary Coolant ◽  
Pressurized Water ◽  
Normal Cycle ◽  
System Pressure

During the normal cycle of a pressurized water reactor, boron concentration is reduced in the core until fuel burns up. A stretch out of the normal cycle is however possible afterwards, provided primary coolant temperature is reduced. In those stretch out periods, nuclear operators want to keep constant thermal power exchanged in the steam generator, in order to preserve its performances. Under that constraint, the required reduction in primary coolant temperature involves both a decrease of secondary cooling system pressure and an increase of tube bundle vibrations. Since neither pressure nor vibrations should exceed some given thresholds in order to preserve component integrity, the reduction of primary coolant temperature has to be limited. Nuclear plant operators thereafter need an operating diagram, i.e. a diagram that provides minimum allowed primary coolant temperature versus power rate. In that context, we propose a method to derive such a diagram, by combining, on the one hand a code for simulating primary and secondary fluid flows in steam generators and, on the other hand, a software that allows one to predict fluid elastic tube bundle instabilities. That method allows one to take into account both tube fouling and plugging. It is now used by French utility “Electricite´ De France”, in order to check or supplement the analysis that are provided by steam generator manufacturers.

Automotive Thermostat Valve Configurations: Enhanced Warm-Up Performance

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
T. Mitchell ◽  
M. Salah ◽  
J. Wagner ◽  
D. Dawson
Keyword(s):  
Cooling System ◽  
Combustion Engine ◽  
Experimental Testing ◽  
Engine Performance ◽  
Coolant Temperature ◽  
Warm Up ◽  
Engine Cooling ◽  
Temperature Tracking ◽  
Smart Thermostat ◽  
Electric Radiator

The automotive cooling system has unrealized potential to improve internal combustion engine performance through enhanced coolant temperature control and reduced parasitic losses. Advanced automotive thermal management systems use controllable actuators (e.g., smart thermostat valve, variable speed water pump, and electric radiator fan) that must work in harmony to control engine temperature. One important area of cooling system operation is warm-up, during which fluid flow is regulated between the bypass and radiator loops. A fundamental question arises regarding the usefulness of the common thermostat valve. In this paper, four different thermostat configurations were analyzed, with accompanying linear and nonlinear control algorithms, to investigate warm-up behaviors and thermostat valve operations. The configurations considered include factory, two-way valve, three-way valve, and no valve. Representative experimental testing was conducted on a steam-based thermal bench to examine the effectiveness of each valve configuration in the engine cooling system. The results clearly demonstrate that the three-way valve has the best performance as noted by the excellent warm-up time, temperature tracking, and cooling system power consumption.

PERFORMANCE OF A WATER PUMP IN AN AUTOMOTIVE ENGINE COOLING SYSTEM

2016 ◽  
Vol 78 (10-2) ◽  
Author(s):  
Mohamad Lazim Mohamed Tasuni ◽  
Zulkarnain Abdul Latiff ◽  
Henry Nasution ◽  
Mohd Rozi Mohd Perang ◽  
Hishammudin Mohd Jamil ◽  
...  
Keyword(s):  
Cooling System ◽  
Maximum Power ◽  
Coolant Temperature ◽  
Electric Pump ◽  
Water Pump ◽  
Test Rig ◽  
Engine Operation ◽  
Automotive Engine ◽  
Engine Cooling ◽  
Simulator Test

A cooling system employed in an automobile is to maintain the desired coolant temperature thus ensuring for optimum engine operation. Forced convection obtained by means of a water pump will enhance the cooling effect. Thus it is necessary to understand the system’s pump operation and be able to provide for the ultimate cooling of the engine. The objective of this laboratory investigation is to study the water pump characteristics of an engine cooling system. The crucial water pump parameters are the head, power, and its efficiency. In order to investigate the water pump characteristic a dedicated automotive cooling simulator test rig was designed and developed. All of the data obtained are important towards designing for a more efficient water pump such as electric pump that is independent of the power from the engine. In addition to this fact, the simulator test rig can also be used to investigate for any other parameters and products such as radiator performance and electric pump before installation in the actual engine cooling system. From the experiment conducted to simulate for the performance of a cooling system of a Proton Wira (4G15), the maximum power equals to 37 W which indicates the efficiency of the pump is relatively too low as compared to the typical power consume by the pump from the engine which are about 1 to 2 kW. Whereas the maximum power and efficiency obtained from the simulator test rig simulator is equals to 42 W and 15% respectively.

Application of Controllable Electric Coolant Pump for Fuel Economy and Cooling Performance Improvement

2004 ◽  
Author(s):  
Hoon Cho ◽  
Dohoy Jung ◽  
Zoran S. Filipi ◽  
Dennis N. Assanis ◽  
John Vanderslice ◽  
...  
Keyword(s):  
Fuel Economy ◽  
Cooling System ◽  
Flow Analysis ◽  
Load Condition ◽  
Electric Pump ◽  
Coolant Pump ◽  
Cooling Performance ◽  
Pump Speed ◽  
Recirculating Flow ◽  
Mechanical Pump

The engine cooling system for a typical class 3 pickup truck with a medium duty diesel engine was modeled with a commercial code, GT-Cool in order to explore the benefit of controllable electric pump on the cooling performance and the fuel economy. As the first step, the cooling system model with a conventional mechanical coolant pump was validated with experimental data. After the model validation, the mechanical pump sub-model was replaced with the electric pump submodel and then the potential benefit of the electric pump on fuel economy was investigated with the simulation. Based on coolant flow analysis the modified thermostat hysteresis was proposed to reduce the recirculating flow and electric pump effort, thus enabling assessment of the full power saving potential. It was also demonstrated that the radiator size could be reduced without any cooling performance penalty by replacing mechanical pump with the electric pump and decoupling of the pump speed from engine speed. The predicted results indicate that the cooling system with the electric pump can dramatically reduce the pump power consumption during the FTP 74 driving schedule and that radiator can be down-sized by more than 27% of the original size under grade load condition.

Research on Varying Duty Operation of Self-Circulation Evaporative Cooling System of Single Stator Collector Ring in Hydro-Generator

2014 ◽  
Vol 488-489 ◽  
pp. 975-978
Author(s):  
Hai Hong Dong ◽  
Lin Ruan ◽  
Rui Cao ◽  
Shu Qin Guo ◽  
Jin Xiu Chen
Keyword(s):  
High Efficiency ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Work Conditions ◽  
Practical Application ◽  
Cooling Performance ◽  
System Pressure ◽  
Evaporative Cooling System ◽  
Cooling Technology ◽  
Operation Characteristics

With the advantage of high-security, energy-saving and high efficiency, the self-circulation evaporative cooling technology provides an ideal solution for the cooling problem of stator collector ring in hydro-generator. In this paper, the operation characteristics of self-circulation evaporative cooling system of single stator collector ring under different work conditions were analyzed by experiments. The experimental results show that the cooling performance of this new cooling system is satisfactory. The temperature distribution of stator collector ring and system pressure distribution were discussed on the basis of experimental data and those variation tendencies were concluded. The research results in this paper provide the basis for further researches and practical application of this new cooling system.

Sign in / Sign up

Export Citation Format

Share Document