Wyniki wyszukiwania - BazTech

1

Zastosowanie miernika gęstości strumienia ciepła do oceny dynamiki spieniania poliuretanów

Trzyna M., Zygmunt B., Koniorczyk P., Zmywaczyk J., Preiskorn M.

Przemysł Chemiczny

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2013

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T. 92, nr 6

975--979

2

Kamera termograficzna jako narzędzie do ilościowego określania gęstości strumienia ciepła

Wróbel A., Wróbel A., Kwartnik-Pruc A., Ortyl Ł.

Pomiary Automatyka Kontrola

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2009

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R. 55, nr 11

938-941

PL

Przeprowadzono badania doświadczalne mające na celu wykazanie równoważności określania gęstości strumienia ciepła przy pomocy ciepłomierza i techniki termografii. Pomiary doświadczalne przeprowadzono w komorze klimatycznej. Badano korelacje pomiędzy wartością gęstości strumienia ciepła pomierzoną ciepłomierzem i obliczoną na podstawie pomiarów termograficznych. Wartość współczynnika korelacji dla badanych przegród wynosi 0.95÷0.99. Wynika stąd, że dokładność pomiaru kamerą termograficzną jest wystarczająca do pomiarów ilościowych w budownictwie.

EN

Determination of thermal properties of building partitions is becoming more important as the requirement for building certification is becoming obligatory. Data for energetic qualification of buildings is taken from their projects. This is a problem in case of old buildings, where there is usually no documentation. Thermography can be used for determination of the actual heat transfer coefficient, which can be useful for thermal assessment of such buildings. The existing norms say that thermography may be used for qualitative evaluation of building partitions. For the quantitative analysis, heat flow is measured with heat flow meters. Conducted investigations show that heat flow measurement with a thermographic camera is equivalent to a measurement taken with a heat flow meter. The investigations were performed in a climate chamber for four real-life partitions. The analyzed partitions were made with use of typical technologies. They differ in ability of heat accumulation. The measurements of the heat flow density were made with use of a heat flow meter. Thermographic cameras were used to record the surface temperature image and air temperature (Fig. 1). The heat flow density determined with the thermographic method had been calculated from formula (2). The correlation between the heat flow density measured by the heat flow meter and that calculated from the thermographic measurements was analyzed. The value of the determination coefficient R2 for the analyzed partition was between 0.91 and 0.99; while the correlation coefficient R between 0.95 and 0.99 (Tab. 1). The conclusion drawn from the investigations is that the accuracy of temperature difference measurements with use of a thermographic camera is good enough to be used for quantitative measurements.

3

Remarks on the thermal conductivity and heat flow density of the Indian Craton

Maj S.

Acta Geophysica

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2008

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Vol. 56, no. 4

994-999

EN

The virtual or effective thermal conductivity (ETC) of the Indian subcontinental crust model is calculated from geochemical/geothermal data on the mean radiogenic heat production and on the real thermal conductivity (TC) of crystalline rocks of India. This ETC, amounting to about 3.45 W/mźK, is 1.4 time greater than the mean real TC value (about 2.5 W/mźK). This is in good agreement with the empirical relation between the surface heat flow density and the Curie depth for the Indian Craton.

4

A note on the lithosphere thickness and heat flow density of the Indian Craton from MAGSAT data

Sarkar R., Saha D., Saha D.

Acta Geophysica

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2006

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Vol. 54, no. 2

198-204

EN

The Curie depth map of India compiled from MAGSAT data has been used for preparing the lithosphere thickness and the surface heat flow density maps of the Indian Craton, utilizing the concept of magnetothermometry. The lithosphere thicknesses of the major Indian geological units/provinces, as obtained from the prepared map, are found to be in reasonably good agreement with the previously published values for these regions. Also, the surface heat flow density values ob-tained from the prepared maps closely follow the previously published results. The maps are useful in providing first order estimates of lithosphere thickness and sur-face heat flow density of the important geological units/provinces of India.

5

Wpływ zmian klimatycznych na temperaturę podpowierzchniową Ziemi

Szewczyk J.

Przegląd Geologiczny

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2005

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Vol. 53, nr 1

77--86

EN

Climate changes are accompanied by temperature changes on the Earth’s surface. Over the past cen-tury the Earth’s surface temperature has been increasing. Is the observed warming simply a natural climatic fluctuation or is it tied to industrialization? A key to the understanding of the climate changeis to understand past climate fluctuations. Temperature changes at the Earth’s surface spread into the subsurface by heat conduction, and manifest at a later time by perturbations in the background of temperature field. Boreholes of several hundreds or thousands of meters depth contain a record of responses to ground surface temperature history over thousands or even of hundreds of thousands years, back to the last glaciation. Geothermal data provide an important supplement to traditional proxy records of surface temperature change. The paper presents results of our investigations of this problem starting from daily temperature fluctuations to the temperature of Weichselian glaciation.

6

A note on the heat flow studies at Sohagpur and Raniganj coalfield areas, India

Sarkar R.K.

Acta Geophysica Polonica

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2005

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Vol. 53, nr 2

197-204

EN

Heat flow density (HFD) studies have been carried out in four boreholes (ranging in depth from 100 to 725 m) spread over Sohagpur and Raniganj Gond-wana basin (India). Thermal conductivities have been measured for about 136 core specimens using divided bar method. Estimated mean HFD of the areas are found to be higher than the mean HFD of the Precambrian shield area of India. The higher HFD could mostly be attributable to the heat generation of the Precambrian base-ment and crustal geothermal provinces of the areas.

7

Warunki geotermiczne Dolnego Śląska

Bruszewska B.

Przegląd Geologiczny

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2000

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Vol. 48, nr 7

639-643

PL

W sposób kompleksowy przedstawiono analizę parametrów termicznych: temperatury, gradientu temperatury, przewodności cieplnej i strumienia cieplnego na obszarze Dolnego Śląska. Zweryfikowano 72 pomiary temperatury w głębokich otworach wiertniczych, z czego 51 wykorzystano do obliczeń średniego gradientu temperatury i strumienia cieplnego (10 tych pomiarów wykonano w 1996 r. w monitoringowej sieci hydrogeologicznej PIG). Wykonano mapy temperatury dla głębokości: 500 m, 1000 m, 1500 m, gradientu temperatury, strumienia cieplnego. Zanotowano, że obniżony strumień cieplny i temperaturę obserwujemy między uskokiem Odry a uskokiem brzeżnym, w starych masywach metamorficznych (metamorfik kaczawski, środkowej Odry, niemczańsko-kamieniecki, kra sowiogórska). Stwierdzono, że istnieje związek między wiekiem i historią geologiczną obszaru a współczesnym strumieniem cieplnym i temperaturą - stare masywy metamorficzne wykazują znaczne obniżenie parametrów termicznych w stosunku do tła. Dla obszarów o dużej powierzchni jest to znana prawidłowość, natomiast dla rejonu o malej powierzchni i do tego mozaikowej budowie - trudno uchwytna zależność.

EN

Analysis of thermal parameters, such as temperature, thermal gradient, thermal conductivity and heat flow in the area of Lower Silesia are presented in the paper. Temperature determinations from 72 deep boreholes were verified, 51 of them were used for mean thermal gradient and heat flow calculations (among them 10 measurements were performed in 1996, for the purpose ofthis project). Basing on above data, the maps of temperature (for the depths 500, 1000, 1500 m), thermal gradient and heat flow were drawn. The correlation between the age, geological history and between the recent heat flow and temperature on the other hand was concluded. The old metamorphic massifs show low a thermal parameters in comparison to the average values for the area. Such a coincidence is a well known rule for the large geological units but for the small units such as dealt in this paper, the correlation is usually difficult to prove.