Coolants At Elevated Temperatures
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Coolants At Elevated Temperatures
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Author : Serge Lievens
language : en
Publisher:
Release Date : 2008
Coolants At Elevated Temperatures written by Serge Lievens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Corrosion inhibitors categories.
Over the years, new performance requirements and environmental regulations have driven engine manufacturers to design new engines. The new engine technologies have resulted in different operating conditions in cooling systems. In general, a trend towards higher coolant temperatures is observed, which is expected to have an implication on the coolant stability and corresponding lifetime. In heavy duty applications, this trend is even more pronounced as engines are running longer and under more severe conditions. In this paper, a selection of different current coolant technologies available in the market have been tested to obtain more information on the influence of the coolant additive package on the thermal stability of the most commonly used coolant base fluid, mono ethylene glycol (MEG). For this reason glycol oxidation products have been measured after subjecting the coolants to high temperature oxidative conditions. In addition the physical/chemical stability of the coolants and corrosion protection level of the additive packages have been evaluated.
Coolants At Elevated Temperatures
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Author : S. Claeys
language : en
Publisher:
Release Date : 2006
Coolants At Elevated Temperatures written by S. Claeys and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Corrosion and anti-corrosives categories.
Over the years, new performance requirements and environmental regulations have driven engine manufacturers to design new engines. The new engine technologies have resulted in different operating conditions in cooling systems. In general, a trend towards higher coolant temperatures is observed, which is expected to have an implication on the coolant stability and corresponding lifetime. In heavy duty applications, this trend is even more pronounced as engines are running longer and under more severe conditions. In this paper, a selection of different current coolant technologies available in the market have been tested to obtain more information on the influence of the coolant additive package on the thermal stability of the most commonly used coolant base fluid, mono ethylene glycol (MEG). For this reason glycol oxidation products have been measured after subjecting the coolants to high temperature oxidative conditions. In addition the physical/chemical stability of the coolants and corrosion protection level of the additive packages have been evaluated.
The Influence Of Elevated Coolant Temperatures On Internal Combustion Engine Performance
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Author : Harry Brandt
language : en
Publisher:
Release Date : 1950
The Influence Of Elevated Coolant Temperatures On Internal Combustion Engine Performance written by Harry Brandt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1950 with Internal combustion engines categories.
Extreme Temperature Range Organic Coolants 800f To 4000f Temperature Range Fluids
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Author : Dale A. Barsness
language : en
Publisher:
Release Date : 1961
Extreme Temperature Range Organic Coolants 800f To 4000f Temperature Range Fluids written by Dale A. Barsness and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Cooling categories.
The Behavior Of Electrolytic Solutions At Elevated Temperatures As Derived From Conductance Measurements
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Author : J. M. Wright
language : en
Publisher:
Release Date : 1961
The Behavior Of Electrolytic Solutions At Elevated Temperatures As Derived From Conductance Measurements written by J. M. Wright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Electrolyte solutions categories.
Development Of A High Temperature Coolant For Advanced Diesel Engines
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Author : I. S. Rhee
language : en
Publisher:
Release Date : 1984
Development Of A High Temperature Coolant For Advanced Diesel Engines written by I. S. Rhee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
This study sought to develop a high-temperature coolant for future advanced military diesel engines capable of operating at high temperatures (up to 150 C). The desirable coolant for high-temperature application must have a high boiling point, a low freezing point, good thermal properties (specific heat and thermal conductivity) and must be able to protect the various metals of the cooling system and the engine components against corrosion. In order to evaluate the candidate for high-temperature application under laboratory conditions, the simulated service corrosion test, ASTM D-2570 was conducted at 121 C for 1064 h. Also with this corrosion test mock-up, the cavitation-corrosion test was performed using an aluminum water pump at 121 C for 700 h. The antifreezes used in these tests were mixtures of MIL-A-46153 antifreeze and water containing 50, 60, and 80 wt percent ethylene glycol and similar mixtures containing the antifreeze extender additive, MIL-A-53009. Based on simulated service test results, the antifreeze mixtures containing 50, 60, and 80 wt percent ethylene glycol with antifreeze extender additive were found to be acceptable as potential candidates for the future advanced diesel engine operating at 121 C. Among the three candidate coolants, the antifreeze mixture containing 60 wt percent of MIL-A-46153 with antifreeze extender additive proved to be the optimum coolant for high-temperature application (121 C) based on its boiling point, freezing point, and thermal properties and on the results of the simulated service corrosion and cavitation-corrosion tests. Keywords: pH and reserve alkalinity.
The Determination Of Vapour Pressures Of Organic Liquid Reactor Coolants At Elevated Temperatures
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Author : G. G. Smith
language : en
Publisher:
Release Date : 1968
The Determination Of Vapour Pressures Of Organic Liquid Reactor Coolants At Elevated Temperatures written by G. G. Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
The Determination Of Vapour Pressures Of Organic Liquid Reactor Coolants At Elevated Temperatures
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Author : G. G. Smith
language : en
Publisher: Pinawa, Manitoba : Whiteshell Nuclear Research Establishment
Release Date : 1968
The Determination Of Vapour Pressures Of Organic Liquid Reactor Coolants At Elevated Temperatures written by G. G. Smith and has been published by Pinawa, Manitoba : Whiteshell Nuclear Research Establishment this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
Comparison Of Bench Test Methods To Evaluate Heavy Duty Coolant Thermal Stability
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Author : R. Doug Hudgens
language : en
Publisher:
Release Date : 2007
Comparison Of Bench Test Methods To Evaluate Heavy Duty Coolant Thermal Stability written by R. Doug Hudgens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Antifreeze categories.
The past 10 to 15 years have seen a dramatic change in heavy duty coolants and cooling system maintenance practices. Controversy exists about the relative merits of newer organic acid (OAT) coolants and more conventional products, especially in the area of thermal stability. Coolant life has been extended from two years/240 K miles to at least five years/600 K miles. It is not uncommon for the same charge of coolant to remain in the cooling system until engine rebuild. Further, there has been an equally significant increase in the coolant service intervals. Reinhibition of the coolant was once tied to the oil change interval at 15 to 25 K miles. Now this additive addition has been extended in many cases to one year/150 K miles to two years/300 K miles. • Along with these dramatic increases in coolant life and service interval, strategies to reduce exhaust emissions such as EGR have increased and will continue to increase coolant temperatures. Sorting out coolant stability issues in the field is both expensive and time consuming. Further, it is very difficult to control a field test so as to obtain reliable data. In this environment, a bench test method that can quickly simulate high temperature, severe field service conditions is of vital importance. This paper compares four bench test methods as far as their ability to sort out thermal stability issues based on results from five coolants representing different additive packages and glycol qualities.
Experimental And Computational Study Of Multi Level Cooling Systems At Elevated Coolant Temperatures In Data Centers
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Author : Manasa Sahini
language : en
Publisher:
Release Date : 2017
Experimental And Computational Study Of Multi Level Cooling Systems At Elevated Coolant Temperatures In Data Centers written by Manasa Sahini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Data libraries categories.
Data centers house a variety of compute, storage, network IT hardware where equipment reliability is of utmost importance. Heat generated by the IT equipment can substantially reduce its service life if Tj,max, maximum temperature that the microelectronic device tolerates to guarantee reliable operation, is exceeded. Hence, data center rooms are bound to maintain continuous conditioning of the cooling medium. This approach often results in over-provisioned cooling systems. In 2014, U.S. Data center electricity consumption is about 1.8% of the total electrical energy in the country. Hence, data center power and cooling have become significant issues facing the IT industry. The first part of the study focuses on air cooling of electronic equipment at room level. Data centers are predominantly cooled by perimeter computer air handling units that supply cold air to the raised floor plenum and the cold air helps in removing the heat generated by IT equipment. This method tends to be inadequate especially when the average power density per rack rises above 4 kW. As a solution to mitigate this problem, different rack and row based cooling solutions have been proposed and used. The primary focus of these cooling methods is to bring cooling closer to the heat source which is the IT rack thereby improving the heat dissipation process along with controlled air flow management in the data center room. Mostly known close-coupled cooling solutions include rear-door heat exchanger, in-row coolers, and over-head cooling. In this study, a new end-of-aisle close-coupled cooling solution for small data center cooling room has been proposed. As oppose to the existing designs, this design is distinctive in eliminating the risk of placing the liquid on top of IT racks along with achieving cooling energy efficiency. Three different configurations of the proposed designs are studied for its thermal performance using computational modeling. The second part of the study focuses on liquid cooling at rack level. Liquid cooling addresses the critical issues related to typical air cooling in servers because of its better heat transfer characteristics. Water-cooling at the device level can be an efficient solution since water has higher thermal capacitance when compared to traditional heat carrying medium i.e., air. The emerging practice in the data center industry is to maximize the use of economizer usage by reducing/eliminating the usage of chiller while taking advantage of outside ambient conditions to cool the data centers. Liquid cooled racks are generally designed with different configuration of pumping systems. Empirical study is conducted on a state-of-art liquid cooled electronic rack for high coolant inlet, commonly known as warm-water cooling in order to evaluate the cooling performance of distributed vs. centralized coolant pumping systems. Experimental set up is instrumented such that detailed analysis is employed to study component temperatures as well as cooling performance of the rack at elevated inlet conditions. The third part of the study focuses on the impact of high server inlet temperatures to static power at server level. In order to maximize the use of economizers, the IT hardware will be exposed to higher inlet temperatures which would lead to higher operating temperatures of the processors. The operating temperature of the CPU has direct influence on the static power due to subthreshold leakage which is known to reduce the performance of the processor. The current work serves as a firsthand investigation to study trade-off between IT performance and energy efficiency for elevated inlet temperature in air vs. liquid cooled servers. Air cooled IT along with the liquid cooled counter-parts are instrumented and extensively tested to simulate the high ambient conditions at the test bed data center.