Results 271 to 280 of about 266,752 (314)
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Efficient Calculation of Heats of Formation
The Journal of Physical Chemistry A, 2009An efficient procedure has been devised for calculating heats of formation of uncharged, closed-shell molecules comprising H, C, N, O, F, S, Cl, and Br. Known as T1, it follows the G3(MP2) recipe, by substituting an HF/6-31G* for the MP2/6-31G* geometry, eliminating both the HF/6-31G* frequency and QCISD(T)/6-31G* energy and approximating the MP2 ...
W S, Ohlinger +3 more
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Relativistic heat engines and efficiency
Physics Letters A, 1996zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Reflux heat pipes as components in heat exchangers for efficient heat recovery
Journal of Heat Recovery Systems, 1980With the r&d work carried out an attempt was made to obtain performance data to subsequently generate analysis and design tools for gravity-supported heat pipes (reflux heat pipes) and thermosyphons. With an extended experimental program the performance limitation of screen-wick heat pipes has been determined as a function of various heat pipe ...
M. Groll, H. Nguyen-Chi, H. Krähling
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Journal of Heat Transfer, 2006
This paper provides the solution to the problem of defining thermal efficiency for heat exchangers based on the second law of thermodynamics. It is shown that corresponding to each actual heat exchanger, there is an ideal heat exchanger that is a balanced counter-flow heat exchanger.
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This paper provides the solution to the problem of defining thermal efficiency for heat exchangers based on the second law of thermodynamics. It is shown that corresponding to each actual heat exchanger, there is an ideal heat exchanger that is a balanced counter-flow heat exchanger.
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Localized Heating for Building Energy Efficiency
2013 26th International Conference on VLSI Design and 2013 12th International Conference on Embedded Systems, 2013Commercial and residential buildings account for a large share of any country's energy consumption (e.g., 40% of total energy consumption in the United States). Within buildings, a major portion of the expended energy is used to provide heating and cooling. However, most buildings are heated and cooled regardless of the occupants' locations, presenting
Jun Wei Chuah +3 more
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Efficient heating with a controlled microwave field
Review of Scientific Instruments, 2011To uncover the intriguing non-thermal microwave effect, an experiment was conducted using an amplifier rather than an oscillator as the radiation source, which was injected into an applicator with strong electromagnetic field enhancement. The characteristics of the applicator are discussed and the enhancement of the microwave field is illustrated and ...
T H, Chang +5 more
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Science, 2019
Industrial Catalysis Large-scale production of hydrogen through steam reforming directly produces CO2 as a side product. In addition, the heating of reactors through fossil-fuel burning contributes further CO2 emissions. One problem is that the catalyst bed is heated unevenly, which renders much of the catalyst effectively inactive.
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Industrial Catalysis Large-scale production of hydrogen through steam reforming directly produces CO2 as a side product. In addition, the heating of reactors through fossil-fuel burning contributes further CO2 emissions. One problem is that the catalyst bed is heated unevenly, which renders much of the catalyst effectively inactive.
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Heating efficiencies in the thermosphere of venus reconsidered
Planetary and Space Science, 1988Heating efficiencies less than 10 percent are required by recent models of the low neutral temperatures in the daytime thermosphere of Venus. It is considered here whether such values are justifiable from a molecular point of view. The primary uncertainty in a calculation of the heating efficiency is the fraction of energy, f sub v, that appears as ...
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Heat transfer efficiency of range units
Electrical Engineering, 1937Surface units of electric ranges have various efficiencies of heat transfer according to the design of the unit. Results of a study made with bright- and black-bottomed utensils are reported in this prize-winning student paper.
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THE EFFICIENCY OF ELECTRICAL HEATING
School Science and Mathematics, 1941W. J. Radle, R. G. Wilson
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