Total Site targeting with process specific minimum temperature difference (ΔTmin)

Energy ◽  
2012 ◽  
Vol 44 (1) ◽  
pp. 20-28 ◽  
Author(s):  
Petar Sabev Varbanov ◽  
Zsófia Fodor ◽  
Jiří Jaromír Klemeš
Keyword(s):  
Temperature Difference ◽  
Minimum Temperature ◽  
Site Targeting

Minimum temperature difference detected by the thermal radiation of objects

1994 ◽  
Vol 35 (5) ◽  
pp. 715-732 ◽  
Author(s):  
Igor I. Taubkin ◽  
Michael A. Trishenkov ◽  
Nikolai V. Vasilchenko
Keyword(s):  
Thermal Radiation ◽  
Temperature Difference ◽  
Minimum Temperature

scholarly journals Thermal Performance of Micro Hotplates with Novel Shapes Based on Single-Layer SiO2 Suspended Film

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 514 ◽  
Author(s):  
Qi Liu ◽  
Guifu Ding ◽  
Yipin Wang ◽  
Jinyuan Yao
Keyword(s):  
Power Consumption ◽  
Mechanical Strength ◽  
Thermal Performance ◽  
Temperature Difference ◽  
Minimum Temperature ◽  
Single Layer ◽  
Temperature Uniformity ◽  
Infrared Images ◽  
Reticular Structure ◽  
The One

In this paper, two kinds of suspended micro hotplate with novel shapes of multibeam structure and reticular structure are designed. These designs have a reliable mechanical strength, so they can be designed and fabricated on single-layer SiO2 suspended film through a simplified process. Single-layer suspended film helps to reduce power consumption. Based on the new film shapes, different resistance heaters with various widths and thicknesses are designed. Then, the temperature uniformity and power consumption of different micro hotplates are compared to study the effect of these variables and obtain the one with the optimal thermal performance. We report the simulations of temperature uniformity and give the corresponding infrared images in measurement. The experimental temperature differences are larger than those of the simulation. Experimental results show that the lowest power consumption and the minimum temperature difference are 43 mW and 50 °C, respectively, when the highest temperature on the suspended platform (240 × 240 μm2) is 450 °C. Compared to the traditional four-beam micro hotplate, temperature non-uniformity is reduced by about 30–50%.

Effects of day-night temperature combinations under constant day length on emergence and early growth of sericea lespedeza genotypes

2007 ◽  
Vol 87 (1) ◽  
pp. 77-81
Author(s):  
K. L. Kalburtji ◽  
J. A. Mosjidis ◽  
A. P. Mamolos
Keyword(s):  
Temperature Difference ◽  
Minimum Temperature ◽  
Seedling Emergence ◽  
Dry Weight ◽  
Day Length ◽  
Night Temperature ◽  
Sericea Lespedeza ◽  
Leaf Dry Weight ◽  
Maximum Minimum ◽  
Number Of Branches

Establishment of sericea lespedeza [Lespedeza cuneata (Dumont de Courset) G. Don.] in southeastern USA is difficult. Seedling emergence may be related to the range of temperatures prevalent during establishment. A growth chamber study was undertaken to measure the effect of temperature on seedling emergence of 56 sericea lespedeza genotypes. Main treatments were: (1) plants grown at three day-night temperature combinations with maximum/minimum temperature difference of 14°C. The temperature combinations were 22/8°C, 27/13°C, and 32/18°C; (2) plants grown at three day-night temperature combinations with maximum/minimum temperature difference of 7°C. This was accomplished by lowering the day temperature and keeping the night temperature the same as above. Emergence was reduced by about 27% with reduction of 7°C in day-night temperature within the range of temperatures used. Plant height, leaf dry weight, stem dry weight and number of branches were very sensitive to temperature combinations. Increases in temperature caused increases in height, leaf dry weight, stem dry weight and number of branches of all genotypes. Further screening of sericea for emergence and growth under low temperature may lead to cultivars with more vigorous seedlings that can be better established early in the season. Key words: Plant growth, temperatures, seedling emergence, Sericea, southern USA

Numerical Simulation of Temperature Field in the Cyclone

2012 ◽  
Vol 614-615 ◽  
pp. 208-211
Author(s):  
Zhen Wei Zhang ◽  
Ying Yu ◽  
Jie Leng ◽  
Su Juan Zhang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Turbulence Model ◽  
Temperature Difference ◽  
Minimum Temperature ◽  
Maximum Temperature ◽  
Inlet Tube ◽  
Higher Temperature ◽  
Air Compression

The temperature distribution of the cyclone was analyzed in the presented work, which was imitated by using RSM turbulence model of software FLUENT. Temperature difference in different regions is less than one centigrade degree with the maximum temperature in the cone part and the minimum temperature in inlet tube and cylinder part of the cyclone, what’s more, the temperature is relatively higher near the wall. The air compression can lead the higher temperature in the lower part, so the cone part has the maximum temperature. The higher temperature near the wall is caused by the friction between the wall and flow.

scholarly journals The airglow layer emission altitude cannot be determined unambiguously from temperature comparison with lidars

2018 ◽  
Vol 18 (9) ◽  
pp. 6691-6697 ◽  
Author(s):  
Tim Dunker
Keyword(s):  
Temperature Difference ◽  
Minimum Temperature ◽  
Rotational Temperature ◽  
Half Maximum ◽  
Data Set ◽  
Gaussian Distributions ◽  
Northern Norway ◽  
Mean Temperature ◽  
The Mean ◽  
Emission Height

Abstract. I investigate the nightly mean emission height and width of the OH* (3–1) layer by comparing nightly mean temperatures measured by the ground-based spectrometer GRIPS 9 and the Na lidar at ALOMAR. The data set contains 42 coincident measurements taken between November 2010 and February 2014, when GRIPS 9 was in operation at the ALOMAR observatory (69.3∘ N, 16.0∘ E) in northern Norway. To closely resemble the mean temperature measured by GRIPS 9, I weight each nightly mean temperature profile measured by the lidar using Gaussian distributions with 40 different centre altitudes and 40 different full widths at half maximum. In principle, one can thus determine the altitude and width of an airglow layer by finding the minimum temperature difference between the two instruments. On most nights, several combinations of centre altitude and width yield a temperature difference of ±2 K. The generally assumed altitude of 87 km and width of 8 km is never an unambiguous, good solution for any of the measurements. Even for a fixed width of ∼ 8.4 km, one can sometimes find several centre altitudes that yield equally good temperature agreement. Weighted temperatures measured by lidar are not suitable to unambiguously determine the emission height and width of an airglow layer. However, when actual altitude and width data are lacking, a comparison with lidars can provide an estimate of how representative a measured rotational temperature is of an assumed altitude and width. I found the rotational temperature to represent the temperature at the commonly assumed altitude of 87.4 km and width of 8.4 km to within ±16 K, on average. This is not a measurement uncertainty.

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