Laboratory tests and modelling of mineral wool insulated steel sandwich panels

This study presents results from laboratory measurements of mineral wool insulated steel sandwich panels. The purpose of the work was to have a better understanding on the heat and moisture conditions inside sandwich panels and to study how the structure behaves in water leakage situation. The tests were done by sealing the structure from all sides and regulating the temperature on one side of the test structure while measuring the temperature and relative humidity conditions inside the structure. Water leakages were created by injecting liquid water onto the insulation layer. According to the results, water vapour pressure differences stayed relatively small both in stationary and dynamic conditions. This implies that the limiting factor for moisture source was the evaporation rate from the water leakage and that the vapour pressure throughout the insulation layer is determined strongly by the vapour pressure at the possible condensation layer. The paper discusses also the determination of sensor accuracy and impacts of a thermal bridge from the probe itself. Also, measurement results from a new radio wave monitoring method are presented.

Download Full-text

Construction and insulation of agricultural buildings and structures

E3S Web of Conferences ◽

10.1051/e3sconf/202016402030 ◽

2020 ◽

Vol 164 ◽

pp. 02030

Author(s):

Boris Efimov ◽

Oleg Rubtsov ◽

Igor Bessonov ◽

Andrey Medvedev

Keyword(s):

Residential Buildings ◽

Sandwich Panels ◽

Mineral Wool ◽

Internal Environment ◽

Excessive Heat ◽

Protection Systems ◽

Insulation Systems ◽

Weather Impacts ◽

Storage Facilities

The article covers different application aspects of the products made of polyethylene foam within the scope of insulation systems of framed and frameless constructions used in the quality of storage premises, logistic objects, agricultural storage facilities and livestock facilities as well as framed residential buildings. Agricultural storage facilities, livestock facilities, covered parking areas for agricultural machinery and some types of storage premises represent the agricultural construction facilities which require the established protection systems against excessive heat losses as well as monitoring of the state of the internal environment - its temperature and humidity. These structures are built based on one of three schemes: frameless type, framed type with a rigid coating and framed type with a tent coating. The insulation of buildings constructed before 2010 is predominantly characterized by usage of mineral wool plates (with a protective facade covering) or sandwich panels. The main problem of suchlike coverings is the impossibility of creating an insulating coating without joints, seams or gapless junctions to the base. Mineral wool plates, in case of destruction of the waterproof coating, contact with water and firstly lose their thermal and physical properties, and then – come to the destruction themselves. Sandwich panels are more resistant to weather impacts, but create a coating with huge quantity of cold bridges and paths of convective air transfer through gaps or openings.

Download Full-text

Influence of water vapour pressure on the thermal dehydration of lithium sulphate monohydrate

Solid State Ionics ◽

10.1016/0167-2738(93)90130-u ◽

1993 ◽

Vol 63-65 ◽

pp. 363-366 ◽

Cited By ~ 15

Author(s):

F ROUQUEROL ◽

Y LAUREIRO ◽

J ROUQUEROL

Keyword(s):

Water Vapour ◽

Vapour Pressure ◽

Thermal Dehydration ◽

Water Vapour Pressure ◽

Lithium Sulphate ◽

Influence Of Water

Download Full-text

Water vapour pressure above saturated salt solutions at low temperatures

Fluid Phase Equilibria ◽

10.1016/s0378-3812(99)00009-6 ◽

1999 ◽

Vol 155 (2) ◽

pp. 297-309 ◽

Cited By ~ 29

Author(s):

V Morillon ◽

F Debeaufort ◽

J Jose ◽

J.F Tharrault ◽

M Capelle ◽

...

Keyword(s):

Water Vapour ◽

Vapour Pressure ◽

Low Temperatures ◽

Water Vapour Pressure ◽

Salt Solutions

Download Full-text

Study of the function of the insulation layer for treating water leakage in permafrost tunnels

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2006.05.032 ◽

2007 ◽

Vol 27 (2-3) ◽

pp. 637-645 ◽

Cited By ~ 7

Author(s):

Zhang Xuefu ◽

Xiao Jianzhang ◽

Zhang Yaonan ◽

Xiao Shengxie

Keyword(s):

Insulation Layer ◽

Water Leakage

Download Full-text

The Study of Evaporation from Small Surfaces by the Direct Measurement of Water Vapour Pressure Gradients

Journal of Experimental Biology ◽

10.1242/jeb.53.3.753 ◽

1970 ◽

Vol 53 (3) ◽

pp. 753-762

Author(s):

JOHN MACHIN

Keyword(s):

Water Vapour ◽

Direct Measurement ◽

Vapour Pressure ◽

Point Method ◽

Dew Point ◽

Water Vapour Pressure ◽

Pressure Gradients ◽

Pressure Measurements ◽

Wind Speeds ◽

Experimental Values

1. The construction, maintenance and calibration of a sensitive instrument capable of making numerous vapour-pressure measurements within humidity gradients by the dew-point method is described. 2. Coefficients of diffusion of water vapour in air, calculated from observed vapour-pressure gradients and measured rates of evaporation agree with theoretical and other experimental values in still air. 3. Apparent coefficients in wind speeds between 10 and 100 cm/s were significantly lower than those in still air. 4. This finding, together with the performance of the dew-point probe, is discussed in relation to its possible use in the study of evaporation from animals and plants.

Download Full-text

The Thermal Comfort of Premature Newborn versus Water Vapour Pressure

IFMBE Proceedings - World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany ◽

10.1007/978-3-642-03885-3_170 ◽

2009 ◽

pp. 612-615

Author(s):

C. F. Oldenburg Neto ◽

M. F. Amorim ◽

S. H. Silva ◽

M. A. Gariba

Keyword(s):

Thermal Comfort ◽

Water Vapour ◽

Vapour Pressure ◽

Water Vapour Pressure ◽

Premature Newborn

Download Full-text

Properties of hydrated TiO2 and SiO2 nanoclusters: dependence on size, temperature and water vapour pressure

Nanoscale ◽

10.1039/c8nr07262k ◽

2018 ◽

Vol 10 (45) ◽

pp. 21518-21532 ◽

Cited By ~ 3

Author(s):

Andi Cuko ◽

Antoni Macià Escatllar ◽

Monica Calatayud ◽

Stefan T. Bromley

Keyword(s):

Water Vapour ◽

Systematic Study ◽

Vapour Pressure ◽

Water Vapour Pressure ◽

Nano Silica

The stabilities and properties of globally optimised (TiO2)M(H2O)N and (SiO2)M(H2O)N clusters with M = 4–16 and a range of N/M ratios are studied with respect temperature and water vapour pressure. Our systematic study provides a comparative reference for understanding hydration of nano-silica and nano-titania.

Download Full-text

Study of the reaction CaSO4.½H2O (β-hemihydrate) = CaSO4 (β-soluble anhydrite)+½H2O in the temperature range 20–100° C

Mineralogical Magazine and Journal of the Mineralogical Society ◽

10.1180/minmag.1965.034.268.28 ◽

1965 ◽

Vol 34 (268) ◽

pp. 327-345 ◽

Cited By ~ 5

Author(s):

J. D. C. McConnell

Keyword(s):

Water Vapour ◽

Vapour Pressure ◽

Physical Adsorption ◽

Linear Increase ◽

Water Vapour Pressure ◽

Hydration Reaction ◽

Temperature Range ◽

Dehydration Reactions ◽

Adsorption Of Water ◽

Hydration And Dehydration

SummaryA thermogravimetric vacuum microbalance has been used to study the reaction between β-soluble anhydrite and water vapour in the temperature range 20–100° C. Equilibrium water-vapour pressures for the hydration reaction in this temperature range were determined directly and have been compared with available data obtained by Kelly, Southard, and Anderson (1941) in the temperature range 80–120° C. The kinetics of the hydration and dehydration reactions have also been studied in a series of isothermal experiments with varying water-vapour pressure. These experiments indicate that in a vapour-pressure range close to the equilibrium value very low rates for both hydration and dehydration are observed. Outside this range of vapour pressures both hydration and dehydration rates increase suddenly and show an approximately linear increase with imposed water-vapour pressure.At low temperatures (25° C) the dehydration reaction has an associated activation energy of approximately 10 kcal mole−1. In the same temperature range additional, physical adsorption of water vapour by the specimen was noted.

Download Full-text

Techniques and Applications for Imaging Biological Samples in a Low Vacuum Environmental Scanning Electron Microscope

Microscopy and Microanalysis ◽

10.1017/s1431927600029986 ◽

2001 ◽

Vol 7 (S2) ◽

pp. 782-783

Author(s):

C. J. Gilpin.

Keyword(s):

Water Vapour ◽

Biological Samples ◽

Vapour Pressure ◽

Water Vapour Pressure ◽

Environmental Scanning ◽

Sample Collection ◽

Electron Microscopes ◽

A Site ◽

Scanning Electron Microscopes ◽

Scanning Electron

Of all the commercially available scanning electron microscopes which operate at “low vacuum” the ESEM is the most suitable for examining biological samples. in order to maintain samples with liquid water present the specimen chamber must be capable of operating at a pressure of at least 4.6 Torr (611 pascals) of water vapour pressure (the vapour pressure of water at 0°C). Use of lower pressures or a chamber gas other than water vapour will result in evaporation of water from the sample at a rate dependant on the partial pressure difference between the sample and its surrounding environment. Tables of relative humidity as a function of water vapour pressure and temperature are readily available to calculate desired settings for the microscope.One of the difficulties associated with examining fresh biological material is the need to have the microscope and sample available in the same location at the same time.If sample collection occurs at a site remote from the microscope inevitable necrotic changes will occur before examination can be carried out.

Download Full-text