Water Vapor Flow and High Thermal Resistance Insulation Systems for Metal Buildings

2009 ◽  
pp. 651-651-10 ◽  
Author(s):  
RM Kelso
Keyword(s):  
Water Vapor ◽  
Thermal Resistance ◽  
Vapor Flow ◽  
Insulation Systems ◽  
High Thermal Resistance ◽  
Metal Buildings

scholarly journals Evaluation of thermal properties of insulation systems in pitched roofs

2019 ◽  
Vol 91 ◽  
pp. 02047 ◽  
Author(s):  
Alexey Zhukov ◽  
Armen Ter-Zakaryan ◽  
Ekaterina Bobrova ◽  
Igor Bessonov ◽  
Andrey Medvedev ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Water Vapor ◽  
Thermal Resistance ◽  
Heat Loss ◽  
Thermal Insulation ◽  
Insulating Layer ◽  
Insulation Systems ◽  
Materials Used ◽  
Supporting Structures

The article outlines the basic requirements for pitched roof insulation systems. The analysis of the properties of thermal insulation materials used in insulation systems was conducted. It is substantiated that the thermal resistance of such structures on the surface of the roof is formed taking into account the thermal conductivity of thermal insulation, thermal conductivity of wooden rafters and heat loss through the leakiness of joints and mounting devices. An assessment was made of the effect of loads of various types on the heat-insulating layer, namely: the effect of the air flow in the ventilated gap; the movement of the vapor-air mixture in the material; condensation of water vapor and penetration of drip liquid; exfiltration of air at the joints of the plates and on the surfaces of contact with the supporting structures. The expediency of using products on the basis of unstitched polyethylene foam in the construction of pitched roofs with a wooden roof system, taking into account the advantages and features of this material, as well as taking into account the possibility of creating a seamless insulating shell, is substantiated.

scholarly journals Thermal-wet model of knitted double jersey based on backpropagation algorithm of neural network

2020 ◽  
Vol 15 ◽  
pp. 155892501990083
Author(s):  
Xintong Li ◽  
Honglian Cong ◽  
Zhe Gao ◽  
Zhijia Dong
Keyword(s):  
Neural Network ◽  
Water Vapor ◽  
Thermal Resistance ◽  
Resistance Test ◽  
Training Algorithm ◽  
Backpropagation Algorithm ◽  
Optimal Network ◽  
Resistance Model ◽  
Hidden Layer ◽  
The Relationship

In this article, thermal resistance test and water vapor resistance test were experimented to obtain data of heat and humidity performance. Canonical correlation analysis was used on determining influence of basic fabric parameters on heat and humidity performance. Thermal resistance model and water vapor resistance model were established with a three-layered feedforward-type neural network. For the generalization of the network and the difficulty of determining the optimal network structure, trainbr was chosen as training algorithm to find the relationship between input factors and output data. After training and verification, the number of hidden layer neurons in the thermal resistance model was 12, and the error reached 10−3. In the water vapor resistance model, the number of hidden layer neurons was 10, and the error reached 10−3.

Breathable properties ofm-Aramid nanofibrous membrane with high thermal resistance

2014 ◽  
Vol 132 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Young Shin Park ◽  
Jong Wha Lee ◽  
Young Sik Nam ◽  
Won Ho Park
Keyword(s):  
Thermal Resistance ◽  
Nanofibrous Membrane ◽  
High Thermal Resistance

The Study on Flow Patterns of Condensation of Superheated Vapor in Nanochannels

2010 ◽  
Author(s):  
Hualing Zhang ◽  
Liu Chao
Keyword(s):  
Water Vapor ◽  
Flow Patterns ◽  
Vapor Condensation ◽  
Condensation Process ◽  
Vapor Flow ◽  
Bubble Flow ◽  
Superheated Water ◽  
Injection Flow ◽  
Two Phases ◽  
Solid Walls

The model of two phases of liquid and vapor flow and vapor condensation under the condition of exerted force was established in parallel nanochannel. Fluid was water molecular and the solid walls are composed of Pt atoms. The process of vapor condensation in nanochannel wall was simulated by molecular dynamic simulation. The different flow patterns of the condensation process of superheated water vapor, which mainly were annular flow, injection flow, slug flow, bubble flow and shrinking bubble flow, were observed under different conditions. For low pressure of water vapor, a new flow pattern which was named as fluctuation flow appeared during condensation process. The simulation results agreed very well with the experimental results provided by references.

scholarly journals Investigation of Bath/Freeze Lining Interface Temperature Based on the Rheology of the Slag

JOM ◽  
2021 ◽  
Author(s):  
Samant Nagraj ◽  
Mathias Chintinne ◽  
Muxing Guo ◽  
Bart Blanpain
Keyword(s):  
Thermal Degradation ◽  
Thermal Resistance ◽  
Conceptual Framework ◽  
Batch Process ◽  
Heat Losses ◽  
Interface Temperature ◽  
Freeze Lining ◽  
High Thermal Resistance ◽  
Critical Viscosity ◽  
Physical And Chemical

AbstractFreeze lining is a solidified layer of slag formed on the inner side of a water-cooled pyrometallurgical reactor, which protects the reactor walls from thermal, physical, and chemical attacks. Because of the freeze lining's high thermal resistance, the reactor heat losses strongly depend on the freeze lining thickness. In a batch process such as slag fuming, the conditions change with time, affecting the freeze lining thickness. Determining the freeze lining thickness is challenging as it cannot be measured directly. In this study, a conceptual framework based on the morphology and microstructure of freeze lining and the rheology of the slag is discussed and experimentally evaluated to determine the freeze lining thickness. It was found that the bath/freeze lining interface lies just below critical viscosity temperature. The growth of the freeze lining is primarily controlled by the mechanical and thermal degradation of the crystals forming at the interface. The bath/freeze lining interface temperature for the measured slag lies in the range of 1035–1070°C.

scholarly journals The lifetimes of evaporating sessile droplets are significantly extended by strong thermal effects

2018 ◽  
Vol 851 ◽  
pp. 231-244 ◽  
Author(s):  
F. G. H. Schofield ◽  
S. K. Wilson ◽  
D. Pritchard ◽  
K. Sefiane
Keyword(s):  
Thermal Properties ◽  
Thermal Resistance ◽  
Thermal Effects ◽  
Asymptotic Solutions ◽  
Saturation Concentration ◽  
High Thermal Resistance ◽  
Explicit Expressions

The evaporation of sessile droplets is analysed when the influence of the thermal properties of the system is strong. We obtain asymptotic solutions for the evolution, and hence explicit expressions for the lifetimes, of droplets when the substrate has a high thermal resistance relative to the droplet and when the saturation concentration of the vapour depends strongly on temperature. In both situations we find that the lifetimes of the droplets are significantly extended relative to those when thermal effects are weak.

Superconducting Multilayer High-Density Flexible Printed Circuit Board for Very High Thermal Resistance Interconnections

2018 ◽  
Vol 193 (3-4) ◽  
pp. 578-584 ◽  
Author(s):  
Xavier de la Broïse ◽  
Alain Le Coguie ◽  
Jean-Luc Sauvageot ◽  
Claude Pigot ◽  
Xavier Coppolani ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
Printed Circuit Board ◽  
High Density ◽  
Circuit Board ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
High Thermal Resistance ◽  
Very High
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