THERMAL ANALYSIS OF DIFFERENT CONFIGURATIONS FOR BUILDING INSULATION SYSTEMS WITH ACTUAL MATERIALS USING REAL SOLAR RADIATION AND TEMPERATURE DATA

2020 ◽  
Author(s):  
Carlos Sa ◽  
Marcos Curi
Keyword(s):  
Thermal Analysis ◽  
Solar Radiation ◽  
Temperature Data ◽  
Building Insulation ◽  
Insulation Systems

scholarly journals THERMAL ANALYSIS OF DIFFERENT CONFIGURATIONS FOR BUILDING INSULATION SYSTEMS WITH ACTUAL MATERIALS USING REAL SOLAR RADIATION AND TEMPERATURE DATA

2021 ◽  
Vol 20 (1) ◽  
pp. 52
Author(s):  
C. B. P. Sa ◽  
M. F. Curi
Keyword(s):  
Heat Flow ◽  
Air Conditioning ◽  
Temperature Data ◽  
Heat Diffusion ◽  
Launch Vehicles ◽  
Heat Diffusion Equation ◽  
Insulating Material ◽  
Building Insulation ◽  
Insulation Systems ◽  
Flow Through

Thermal insulation is present in several engineering areas, such as in civilconstruction, in industrial ovens, in satellites and launch vehicles and even indomestic applications, such as refrigerators. This work aims to presentmultilayer insulation for civil construction, thus reducing electrical energyexpenditure on air conditioning the environment and increasing thermalcomfort. To determine the heat flow through the wall, it was necessary tosolve the heat diffusion equation in rectangular Cartesian coordinates for eachinsulation layer, and the boundary conditions of each differential equationdepend on the neighboring layers, thus forming a system of equations. TheWolfram Mathematica computational software was used to solve themathematical equations. The heat flow was determined for the four seasonsof the year throughout the day for different configurations of thermalinsulation, varying the insulating material and its thickness. After analyzingthe results, it was possible to observe the great efficiency of the models withthermal insulation compared to traditional walls, making the internal wall'stemperature profile more constant throughout the day.

scholarly journals FIRE TESTING OF THE BUILDING FACADE INSULATED WITH FOAM POLYSTYRENE/PUTŲ POLISTIRENU APŠILTINTŲ FASADO FRAGMENTŲ GAISRINIAI BANDYMAI

1999 ◽  
Vol 5 (5) ◽  
pp. 340-346 ◽  
Author(s):  
Albertas Nyderis ◽  
Romualdas Mačiulaitis
Keyword(s):  
Thermal Radiation ◽  
Functional Relation ◽  
Heat Radiation ◽  
Bottom Line ◽  
Fire Hazards ◽  
Testing Conditions ◽  
Foam Polystyrene ◽  
Building Insulation ◽  
Building Facade ◽  
Insulation Systems

In the past decade, construction business applied various heat insulating materials comprising a spectrum of properties according to their combustibility. Particular attention was paid to insulation materials related to fire hazards. The normative fire safety documents started to be drawn up in this country at the time when the process of building insulation had not been initiated yet. Therefore, there still exists a great need for assessing the fire hazards of building insulation systems. With the use of the experience of other countries new testing equipment for insulating building facade with foam polystyrene has been recently established. The equipment is loaded with a 2.4×2.0 meter wall fragment and 800×700 mm plate of electrical thermal radiation flow, as well as a gas burner and a device for taking the temperature. The theoretical bottom-line of these testing methods lies in the heat exchange between two parallel walls, one of which is much hotter. The calculation of the thermal radiation flow is presented in formula 1 and the theoretical basis is indicated in formulae 2–10. Formula 11 indicates the rates of the flame heat radiation flows. Formula 12 shows special testing conditions. In the course of testing the insulation systems, the geometrical quantities of violation zones of foam polystyrene have been determined, they have exceeded the calculations of the flow radiation plate of active heat several times. A strong functional relation between the thickness of foam polystyrene and the rates of violation zones (r xy =0.694) and a weak functional relation between the thickness of plaster and the rates of violation zones (r xy = −0.580) have also been defined. Formulas 13 and 14 describe the relations between the surface areas of the destruction, the thickness of the foam polystyrene and the thickness of the plaster. By taking the temperatures in the vertical axis of the geometrical centre of the wall fragment, it was determined that in the course of testing the temperatures become dangerous in relation to the combustibles (about 250°C). The tests indicate that favourable and stable testing conditions established. It is expedient to continue the tests with other types of building facade materials.

scholarly journals Mechanical Fault Detection on Electrical Machine: Thermal Analysis of Small Brushed DC Motor with Faulty Bearing

2018 ◽  
Vol 225 ◽  
pp. 05012
Author(s):  
Abbas A. Wahab ◽  
N. Fatimah Abdullah ◽  
M.A.H. Rasid
Keyword(s):  
Thermal Analysis ◽  
Steady State ◽  
Direct Current ◽  
Dc Motor ◽  
Temperature Data ◽  
Electrical Machine ◽  
Financial Loss ◽  
Data Logger ◽  
Steady State Temperature ◽  
Using Data

Direct current motors (DC motor) are used in the small electric devices commonly. DC motor are cheap and easy to install, thus their popularity. Despite the popularity, faults occur which make diagnosis and detection of faults very important. It avoids financial loss and unexpected shutdown operation causes by these faults. This paper presents an analysis of temperature profile of the much famous small Brushed DC motor with a faulty bearing. The temperature data of healthy DC motor and DC motor with faulty bearing were measured by thermocouple and recorded using data logger in real time until steady state temperature, under different load. The analysis on the steady state temperature allow to conclude that bearing fault can clearly be recognised through characteristics temperature difference with a healthy motor.

A Climatic Model of Solar Radiation and Temperature Change

1974 ◽  
Vol 4 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Clayton H. Reitan
Keyword(s):  
Solar Radiation ◽  
Energy Budget ◽  
Temperature Data ◽  
Direct Solar Radiation ◽  
Response Ratio ◽  
Radiation Data ◽  
Long Term Trends ◽  
The 1960S ◽  
The Relationship

Mean monthly temperatures for the Northern Hemisphere were determined for the years 1955 through 1968 following the same procedures used by H. C. Willett and J. M. Mitchell, Jr., in their studies of long-term trends. It was found that the downward trend they reported starting in the 1940s continued, though interrupted, into the 1960s.The temperature data when combined with radiation data and other components of the hemispheric energy budget led to the formulation of the response ratio, the relationship between change in incoming solar radiation and change in temperature. When this response ratio was applied to the reported trends in direct solar radiation and to the decrease in direct solar radiation following the eruption of Agung in 1963, a probable cause-effect relationship was suggested.

scholarly journals Point thermal bridges of insulated pitched roof structures

2018 ◽  
Vol 146 ◽  
pp. 03014 ◽  
Author(s):  
Jiří Šál ◽  
Daniela Štroufová ◽  
Petra Bednářová
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Thermal Insulation ◽  
Overall Heat Transfer Coefficient ◽  
Building Insulation ◽  
Insulation Systems ◽  
Thermal Bridges ◽  
The Individual ◽  
The Heat Transfer Coefficient

The current demands on building insulation are continuously increasing. It is understood that the lower the heat transfer coefficient of a particular part of a construction is, the greater the importance of systemic thermal bridges. This article compares the individual systems of insulation of pitched roofs in terms of the heat transfer coefficient. The focus is on the size of the point thermal bridges in rafter thermal insulation systems and determines their impact on increasing the overall heat transfer coefficient. However, it should be noted that point thermal bridges are individually very small and combined only contribute to 2% of the overall heat transfer coefficient of parts of a structure.

scholarly journals A Temperature-Based Model for Estimating Monthly Average Daily Global Solar Radiation in China

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Huashan Li ◽  
Fei Cao ◽  
Xianlong Wang ◽  
Weibin Ma
Keyword(s):  
Solar Radiation ◽  
Air Temperature ◽  
Statistical Error ◽  
Global Solar Radiation ◽  
Measured Data ◽  
Temperature Data ◽  
New Model ◽  
Climatic Regions ◽  
Monthly Average ◽  
Temperature Records

Since air temperature records are readily available around the world, the models based on air temperature for estimating solar radiation have been widely accepted. In this paper, a new model based on Hargreaves and Samani (HS) method for estimating monthly average daily global solar radiation is proposed. With statistical error tests, the performance of the new model is validated by comparing with the HS model and its two modifications (Samani model and Chen model) against the measured data at 65 meteorological stations in China. Results show that the new model is more accurate and robust than the HS, Samani, and Chen models in all climatic regions, especially in the humid regions. Hence, the new model can be recommended for estimating solar radiation in areas where only air temperature data are available in China.

scholarly journals Prediction of solar radiation with air temperature data in a coastal location in Tamilnadu

MAUSAM ◽  
2021 ◽  
Vol 62 (1) ◽  
pp. 85-90
Author(s):  
A. MUGRAPAN ◽  
SUBBARAYAN SIVAPRAKASAN ◽  
S. MOHAN
Keyword(s):  
Solar Radiation ◽  
Air Temperature ◽  
Minimum Temperature ◽  
Reference Evapotranspiration ◽  
Temperature Data ◽  
Maximum Temperature ◽  
Adjustment Coefficient ◽  
Meteorological Observatory ◽  
Daily Sunshine ◽  
Sunshine Hour

The objective of this study is to evaluate the performance of the Hargreaves’ Radiation formula in estimating daily solar radiation for an Indian coastal location namely Annamalainagar in Tamilnadu State. Daily solar radiation by Hargreaves’ Radiation formula was computed using the observed data of maximum temperature, Tmax and minimum temperature, Tmin, sourced from the India Meteorological Observatory located at Annamalainagar and employing the adjustment coefficient KRS of 0.19. Daily solar radiation was also computed using Angstrom-Prescott formula with the measured daily sunshine hour data. The differences between the daily solar radiation values computed using the formulae were more pronounced in year around. Hence, the adjustment coefficient KRS is calibrated for the study location under consideration so that the calibrated KRS could be used to better predict daily solar radiation and hence better estimation of reference evapotranspiration.

A Study on the Flow and Thermal Stress Analysis of the Hot Gas Casing of the Gas Turbine

2006 ◽  
Vol 306-308 ◽  
pp. 169-174
Author(s):  
Young Jin Choi ◽  
Young Shin Lee ◽  
Jae Hoon Kim ◽  
Won Shik Park ◽  
Hyun Soo Kim
Keyword(s):  
Thermal Analysis ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Gas Turbine ◽  
Flow Analysis ◽  
Load Condition ◽  
Temperature Data ◽  
Thermal Gradients ◽  
Thermal Stress Analysis ◽  
Hot Gas

The hot gas casing of the gas turbine has operated in high temperatures and thermal gradients. The structure safety of hot gas casing will be highly depend on the thermal stress. In this paper, flow and thermal stress analysis of the hot gas casing is carried out using ANSYS program. The obtained temperature data by flow analysis of hot gas casing is applied to the load condition of the thermal analysis. The thermal stress analysis is carried out the elastic-plasticity analysis. The pressure, temperature and velocity of the flow and thermal stress of the hot gas casing are presented

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