scholarly journals Method for Determining the Optimum Insulation Thickness of the Plaster Tow Material: Influence of the Heat Exchange Coefficient in Transient Regime

2021 ◽  
Vol 16 (3) ◽  
pp. 53
Author(s):  
Papa Touty TRAORE ◽  
Fatimata BA ◽  
Babou DIONE ◽  
Moussa DIENG
Keyword(s):  
Heat Exchange ◽  
Thermal Resistance ◽  
Numerical Method ◽  
Transient Regime ◽  
Exchange Coefficient ◽  
Heat Exchange Coefficient ◽  
Insulation Thickness ◽  
Resistance Value ◽  
Optimum Insulation Thickness

In this paper, we have applied a numerical method to determine the optimum insulation thickness of the tow plaster plane material. The influence of the exchange coefficients at the level of the two faces of the material has been highlighted. The optimum insulation thickness of the material is at the area where the thermal resistance value of the material is the maximum. We added the relative thermal resistance to show how the optimum insulation thickness changes when the exchange coefficients change values.

scholarly journals On the Heat Exchange Between Rivers and Atmosphere

1982 ◽  
Vol 13 (2) ◽  
pp. 65-78
Author(s):  
Ole Stang
Keyword(s):  
Heat Exchange ◽  
Empirical Relationship ◽  
Flowing Water ◽  
Exchange Coefficient ◽  
Heat Exchange Coefficient ◽  
Hydro Power ◽  
Temperature Changes ◽  
Air Temperatures ◽  
The One ◽  
Semi Empirical

In order to be able to predict water temperatures in rivers which are to be harnessed for hydro power, it is essential to take into account the heat exchange with the atmosphere. It is often sufficient to predict average temperatures and temperature changes for periods of some days. A simple model for the heat exchange between flowing water and atmosphere has been developed for this purpose. The model offers a semi-empirical relationship between air temperature and water temperature. In this paper the model is applied to the Orkla river in Central Norway, and it is demonstrated how analyses of diurnal variations of water and air temperatures make it possible to predict the downstream decay of temperature changes originating from man-made releases. As a result an average heat exchange coefficient is calculated for Orkla for the summer of 1980. This calculation indicates that the cooling/heating rate in the flowing water in Orkla is considerably greater than the one for lakes under the same meteorological conditions.

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