Wyniki wyszukiwania - BazTech

1

The influence of particular parameters on the temperature distribution in the impletion of regenerative heat exchanger

Chylińska D.

Structure and Environment

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2015

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Vol. 7, no. 1

29--33

EN

The article describes the process of unsteady heat transfer that occurs between the impletion of regenerative heat exchanger and the surrounding air. A mathematical model of this phenomenon and its exemplary solution using the method of elementary balances were presented. Numerical calculations using Mathcad were applied. As a result, the set temperature field is formed in the heat exchanger wall. The influence of the geometrical dimensions (length of the filling) and air velocity on the temperature distribution in the fill were analysed.

2

The influence of grout used in borehole vertical ground heat exchangers on heat flux from the ground

Jurek A.

Structure and Environment

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2014

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Vol. 6, no. 3

45--50

EN

This paper describes a process for the non-stationary heat transfer that occurs between the vertical ground heat exchanger, surrounded by grout and the surrounding ground. Mathematical model of this phenomenon and its exemplary solution using the method of elementary balances were presented. Numerical calculations were performed using Mathcad. As a result, the set temperature field is formed in the wall of the heat exchanger, in the grout and also in the ground surrounding the U-tube and the amount of heat extracted from ground in the case of not including the occurrence of filling and using a variety of commonly used grouts.

3

Warunki pomiaru a wartość współczynnika przewodzenia ciepła

Garbalińska H., Siwińska A.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2010

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z.57[271], nr 4

161-166

PL

W referacie przedstawiono wyniki badań współczynnika przewodzenia ciepła przeprowadzonych metodą niestacjonarną w odniesieniu do zaprawy cementowej czystej, modyfikowanej i cementowo-wapiennej. Pomiary zrealizowano na próbkach o różnych kształtach i gabarytach, przy czym próbki badane były w dwóch stanach: suchym i nasączonym wodą. Pomiary przeprowadzono aparatem ISOMET2104 z wykorzystaniem sondy przylgowej. Zebrane w eksperymencie wyniki poddano ocenie porównawczej, której celem było oszacowanie wpływu cech geometrycznych próbek na wartości współczynnika przewodzenia ciepła danego materiału, otrzymane przy pomocy zastosowanej techniki pomiarowej.

EN

The paper presents results of tests for the thermal conductivity coefficient, conducted with the non-stationary method, on pure cement, modified and cement-lime mortars. The measurements were performed on samples of various shapes and sizes, whereas the samples were either dry or soaked with water. The measurements were conducted with apparatus ISOMET2104, using a contact probe. The results collected in the experiment underwent a comparative assessment in order to evaluate influence of geometric characteristics of the samples on value of the thermal conductivity coefficient for each material, obtained by the means of the applied measurement technique.