Radiation Scattering Versus Radiation Absorption — Effects on Performance of Thermal Insulation Under Non-Steady-State Conditions

2009 ◽  
pp. 366-366-15 ◽  
Author(s):  
DR Flynn ◽  
R Gorthala
Keyword(s):  
Steady State ◽  
Thermal Insulation ◽  
Radiation Absorption ◽  
Radiation Scattering

scholarly journals Numerical Simulation of Thermal Conductivity of Foam Glass Based on the Steady-State Method

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 54 ◽  
Author(s):  
Zipeng Qin ◽  
Gang Li ◽  
Yan Tian ◽  
Yuwei Ma ◽  
Pengfei Shen
Keyword(s):  
Thermal Conductivity ◽  
Steady State ◽  
Heat Flow ◽  
Thermal Resistance ◽  
Thermal Insulation ◽  
Foam Glass ◽  
Orthogonal Experimental Design ◽  
Carbonate Content ◽  
Steady State Method ◽  
State Method

The effects of fly ash, sodium carbonate content, foaming temperature and foaming time on foam glass aperture sizes and their distribution were analyzed by the orthogonal experimental design. Results from the steady-state method showed a normal distribution of the number of apertures with change in average aperture, which ranges from 0.1 to 2.0 mm for more than 93% of apertures. For a given porosity, the thermal conductivity decreases with the increase of the aperture size. The apertures in the sample have obvious effects in blocking the heat flow transmission: heat flow is quickly diverted to both sides when encountered with the aperture. When the thickness of the sample is constant, the thermal resistance of the foam glass sample increases with increasing porosity, leading to better thermal insulation. Furthermore, our results suggest that the more evenly distributed and orderly arranged the apertures are in the foam glass material, the larger the thermal resistance of the material and hence, the better the thermal insulation.

Understanding the Dynamic and Static Thermal Transfer in Brick Walls

2012 ◽  
Vol 512-515 ◽  
pp. 2834-2837 ◽  
Author(s):  
Emilio Sassine ◽  
Zohir Younsi ◽  
Yassine Chérif ◽  
Emmanuel Antczak
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Thermal Insulation ◽  
Brick Wall ◽  
Equivalent Resistance ◽  
Thermal Transfer ◽  
Electrical Analogy ◽  
State Case

The aim of this paper is to study the thermal heat transfer through a 33 cm brick wall, typical of old houses in Lille, a northern French town. First, the wall was studied in a steady state case in order to determine its equivalent resistance using the electrical analogy. Then, the wall is replaced by an equivalent homogeneous wall in order to compare the 1D and the 3D thermal transfer. The results show a perfect consistency between the two models, representing a big advantage when other layers are added to the model like thermal insulation and facing.

Ontogeny of homeothermy in the immature rat: metabolic and thermal responses

1986 ◽  
Vol 60 (4) ◽  
pp. 1190-1197 ◽  
Author(s):  
D. E. Spiers ◽  
E. R. Adair
Keyword(s):  
Steady State ◽  
Metabolic Rate ◽  
Skin Temperature ◽  
Thermal Insulation ◽  
Primary Factor ◽  
O2 Consumption ◽  
Immature Rat ◽  
Ambient Temperatures ◽  
Thermoregulatory Responses ◽  
Age Dependent

Steady-state thermoregulatory responses were measured in the immature rat at 5, 7, 9, 11, 13, 15, 17, and 19 days of age. Tests were conducted at controlled ambient temperatures (Ta) ranging from 22.5 to 37.0 degrees C. Colonic (Tco) and skin (tail, interscapular, abdominal) temperatures were measured, as was O2 consumption from which metabolic rate (M) was calculated. Significant improvements in homeothermic ability occurred from 5 to 19 days of age. Although the resting level of M (RMR) increased by 6.9 W/m2 and the lower Ta limit for RMR (LCT) decreased by 2.5 degrees C as age advanced from 5 to 19 days, Tco at LCT was 36.8–37.1 degrees C at all ages studied. Below LCT the elevation of M to a given decrease in Tco was greater the older the animal. A comparable response to a change in skin temperature was not age dependent. Improvement in thermal insulation was the primary factor responsible for increases in homeothermic ability between 5 and 19 days of age.

Studies on Water in the Hydration Chamber of a Modified Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 544-545
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electron Microscope ◽  
Steady State ◽  
Room Temperature ◽  
Small Mass ◽  
Equilibrium Pressure ◽  
Biological Objects ◽  
Mechanical Pump ◽  
Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

Continuous hydrogenolysis of acetal-stabilized lignin in flow

2021 ◽  
Author(s):  
Wu Lan ◽  
Yuan Peng Du ◽  
Songlan Sun ◽  
Jean Behaghel de Bueren ◽  
Florent Héroguel ◽  
...  
Keyword(s):  
Steady State ◽  
Challenges And Opportunities

We performed a steady state high-yielding depolymerization of soluble acetal-stabilized lignin in flow, which offered a window into challenges and opportunities that will be faced when continuously processing this feedstock.

Sign in / Sign up

Export Citation Format

Share Document