Development of Outlast Fiber and Study about its Character of Thermoregulation

2012 ◽  
Vol 557-559 ◽  
pp. 979-982
Author(s):  
Yong Fang Zhang ◽  
Bu Kun Sun
Keyword(s):  
Thermal Analysis ◽  
Heat Release ◽  
Temperature Regulation ◽  
Heat Absorption ◽  
Acrylic Fiber ◽  
The Future ◽  
Crystallization Heat ◽  
Enthalpy Data

On the ground of its development and thermoregulation theory, thermoregulation property of Outlast fiber was subjected to test and analysis by means of thermal analysis. Specifically over the applied sample of Outlast acrylic fiber, it was concluded by test that the ranges of fusion heat absorption and crystallization heat release were 22.11°C～25.84°C and 27.45°C～20.07°C, peak temperatures of heat absorption and release were 25.84°C and 20.07°C, and enthalpy data of fusion & crystallization were 7.887J/g and 9.667J/g respectively. Outlast fiber, therefore, has been certified its obvious capability of temperature regulation, as a foundation for further study in the future.

The future of thermal analysis

1988 ◽  
Vol 135 ◽  
pp. 11-17
Author(s):  
Edith A. Turi
Keyword(s):  
Thermal Analysis ◽  
The Future

Thermodynamical Calculations and Experimental Confirmation about the Mg-Al-Spinel Reaction Path in the Sol-Gel-Process

2006 ◽  
Vol 317-318 ◽  
pp. 135-138 ◽  
Author(s):  
Wilfried Wunderlich ◽  
Krupathi Vishista ◽  
Francis D. Gnanam ◽  
Daniel Doni Jayaseelan
Keyword(s):  
Thermal Analysis ◽  
Reaction Path ◽  
Sol Gel ◽  
Chemical Processing ◽  
Aluminium Isopropoxide ◽  
Spinel Formation ◽  
Sol Gel Process ◽  
Wet Chemical ◽  
Enthalpy Data ◽  
Good Agreement

The aim of this research is, to clarify which route the sol-gel-process is taking in the case of a Al-Mg-spinel slurry, in particular, whether the hydrolysis reaction or the spinel formation is faster and which of the intermediate hydroxide phases Al(OH)3, and Mg(OH)2, or MgO and Al2O3 or MgAl2O4H2O are formed during the spinel formation. The spinel-alloy was produced using the polymeric route during wet chemical processing. Aluminium-isopropoxide was hydrolyzed in order to form the boehmite-sol and then the same amount of magnesia was added and mixed. This sol precipitated as boehmite (AlOOH) and brucite (Mg(OH)2) after ageing for 12h as confirmed by differential thermal analysis (DTA), and differential thermal gravity (DTG) measurements. After that, the powders were subsequently annealed at 900oC for 3h in air and observed by TEM. Calculations using thermodynamic enthalpy data are in good agreement with the experiments and can be used to predict reaction paths in other system as well.

scholarly journals Comparison of Thermal Analysis and Differential Thermal Analysis for Evaluating Solid Fraction Evolution during Solidification of Al-Si Alloys

2010 ◽  
Vol 649 ◽  
pp. 493-498 ◽  
Author(s):  
Ana Isabel Fernández-Calvo ◽  
Andrea Niklas ◽  
Jacques Lacaze
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Heat Release ◽  
Latent Heat ◽  
Solid Fraction ◽  
Metallic Alloys ◽  
Transfer Model ◽  
Cooling Curves ◽  
Latent Heat Release ◽  
Controlled Cooling

Both thermal analysis (TA) and differential thermal analysis (DTA) have been used since long to evaluate latent heat release and solid fraction evolution during solidification of metallic alloys. TA makes use of cooling curves recorded under "natural" cooling while DTA consists in recording the temperature difference between the sample temperature and an inert reference during a controlled cooling, i.e. at imposed constant cooling rate. In both cases, the solid fraction evolution is deduced from a calculation of the latent heat release as estimated by means of a heat transfer model. This paper provides a comparison of such evaluations performed on one Al-Si alloy.

scholarly journals ON A METAL FIRE DETECTION

2018 ◽  
pp. 197
Author(s):  
Nada Jovičić
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Early Stage ◽  
Fire Detection ◽  
High Heat ◽  
The Other ◽  
Heat Absorption ◽  
Class D ◽  
Flame Detector

The aim of this paper is to analyze possibilities of metal fire detection using various types of fire detectors, and find the most convenient type of detector. Metal fires belong to class D fires, and demand extinguishing agents which work by smothering and heat absorption. On the other hand, it is too risky to use heat generated by fire for early-stage detection due to high heat release rate. Some metals burn with smoke, but during the fire, most of them produce significant ultraviolet and infrared component of radiation which can be used for detection. Therefore, this paper analyzes the possibility of using a flame detector in case of metal fires, as well as sitting and spacing of flame detectors for metal fire detection at its earliest stage.  

scholarly journals The Principle of Least Action for Reversible Thermodynamic Processes and Cycles

Entropy ◽  
2018 ◽  
Vol 20 (7) ◽  
pp. 542 ◽  
Author(s):  
Tian Zhao ◽  
Yu-Chao Hua ◽  
Zeng-Yuan Guo
Keyword(s):  
Heat Release ◽  
Optimization Problems ◽  
Optimal Path ◽  
Classical Mechanics ◽  
Carnot Cycle ◽  
Heat Absorption ◽  
Least Action ◽  
Principle Of Least Action ◽  
Thermodynamic Processes ◽  
Release Processes

The principle of least action, which is usually applied to natural phenomena, can also be used in optimization problems with manual intervention. Following a brief introduction to the brachistochrone problem in classical mechanics, the principle of least action was applied to the optimization of reversible thermodynamic processes and cycles in this study. Analyses indicated that the entropy variation per unit of heat exchanged is the mode of action for reversible heat absorption or heat release processes. Minimizing this action led to the optimization of heat absorption or heat release processes, and the corresponding optimal path was the first or second half of a Carnot cycle. Finally, the action of an entire reversible thermodynamic cycle was determined as the sum of the actions of the heat absorption and release processes. Minimizing this action led to a Carnot cycle. This implies that the Carnot cycle can also be derived using the principle of least action derived from the entropy concept.

Preparation and Properties of Magnesium Based Hydrogen Storage Alloy Mg2NiH4 in Chemical Engineering

2012 ◽  
Vol 577 ◽  
pp. 61-64
Author(s):  
Lei Li Liu ◽  
Jing Jing Xin ◽  
Feng Ma
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Hydrogen Storage ◽  
Heat Release ◽  
Chemical Engineering ◽  
Catalytic Effect ◽  
Diffusion Method ◽  
Hydrogen Storage Alloys ◽  
Thermal Decomposition Behaviour ◽  
Decomposition Behaviour

Mg2NiH4 was prepared by replacement-diffusion method, and its structure was determined by XRD、ICP and DSC-TG. The influence of Mg2NiH4 on the thermal decomposition behaviour for ammonium perchlorate (AP) was carried out by thermal analysis (DSC). Results show that Mg2NiH4 has obvious catalytic effect on the thermal decomposition of AP. This catalytic effect of Mg2NiH4 was enhanced with its increase in content, and the DSC heat release for AP was on its biggest value when the content of Mg2NiH4 was 30%. With the increase of hydrogen storage, the catalytic effect of Mg-Ni hydrogen storage alloys became stronger.

scholarly journals Thermal Analysis of Solar Protection on Windows in Tropical Areas

2020 ◽  
Vol 2 (2) ◽  
pp. 45-56
Author(s):  
Fadhilla Azherda ◽  
Remon Lapisa ◽  
Waskito Waskito ◽  
Hasanuddin Hasanuddin
Keyword(s):  
Thermal Analysis ◽  
Thermal Comfort ◽  
Tilt Angle ◽  
Room Temperature ◽  
Cool Temperature ◽  
Heat Absorption ◽  
Indoor Thermal Comfort ◽  
Solar Shading ◽  
Tropical Areas ◽  
Indoor Lighting

Thermal comfort is one element of comfort that is very important, because it concerns the condition of the room temperature. Where the cool temperature in the room is a condition of thermal comfort of a building, besides indoor lighting also affects the comfort of the room. The building window is one of the factors that affects the thermal comfort of the building, therefore, it is necessary to find the solution for the heat absorption that occurs through the glass window not directly into the building. This research aims to analyze the solar protection on the windows of the building on the teropical climate, in the windows of paired Building solar protection (Solar Shading) that can be variated tilt angle. which uses a variation of tilt angles of 0 ° (-), 45 ° (/), and 90 ° (|) with the aim of obtaining indoor thermal comfort as well as indoor lighting. Kenyamanan termal merupakan salah satu unsur kenyamanan yang sangat penting, karena menyangkut kondisi suhu ruangan. Dimana temperature dalam ruangan yang sejuk adalah syarat kenyamanan termal suatu bangunan, selain itu pencahayaan dalam ruangan juga mempengaruhi kenyamana dalam ruangan. Jendela bangunan merupakan salah satu faktor yang mempengaruhi kenyamanan termal pada bangunan, Oleh karena itu perlu dicarikan solusi agar penyerapan panas yang terjadi melalui jendela kaca tidak lansung masuk kedalam bangunan. Penelitian ini bertujuan untuk menganalisis proteksi surya pada jendela bangunan pada iklim teropis, pada jendela bangunan dipasangkan proteksi surya (Solar Shading) yang dapat divariasikan sudut kemiringan. dimana menggunakan variasi sudut kemiringan 0˚(-), 45˚(/), dan 90˚(|) dengan tujuan mendapatkan kenyamanan termal dalam ruangan dan juga pencahayaan dalam ruangan.

The CdO–CdF2 system: X-ray diffractogram, infrared spectrum, and density of CdO•2CdF2

1970 ◽  
Vol 48 (10) ◽  
pp. 1619-1622 ◽  
Author(s):  
P. Ramamurthy ◽  
E. A. Secco
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Infrared Spectrum ◽  
Powder Diffraction ◽  
Heat Absorption ◽  
X Ray

The CdO–CdF2 system has been studied by differential thermal analysis (DTA), X-ray powder diffraction, and infrared spectroscopy.The results show a distinct X-ray diffractogram and infrared spectrum for the CdO–CdF2 mole ratio 1:2, prefused and annealed, suggesting the existence of the compound CdO•2CdF2. The compound undergoes a transformation at 690 °C, characterized by a low heat absorption suggesting an order–disorder phenomenon.

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