Use of the pulse transient method to investigate the thermal properties of two porous materials

2003 ◽  
Vol 35/36 (1) ◽  
pp. 67-74 ◽  
Author(s):  
Vlastimil Boháč ◽  
L'udovít Kubičár ◽  
Viliam Vretenár
Keyword(s):  
Thermal Properties ◽  
Porous Materials ◽  
Transient Method ◽  
Pulse Transient Method

Pulse Transient Method as a Tool for the Study of Thermal Properties of Solar Cell Laminating Films

2009 ◽  
Vol 30 (6) ◽  
pp. 1891-1901 ◽  
Author(s):  
O. Zmeškal ◽  
P. Štefková ◽  
L. Hřebenová ◽  
R. Bařinka
Keyword(s):  
Thermal Properties ◽  
Solar Cell ◽  
Transient Method ◽  
Pulse Transient Method

Thermophysical Analysis of Sandstone by Pulse Transient Method

2006 ◽  
Vol 27 (1) ◽  
pp. 220-234 ◽  
Author(s):  
L’ Kubičár ◽  
V. Vretenár ◽  
V. Boháč ◽  
P. Tiano
Keyword(s):  
Transient Method ◽  
Pulse Transient Method

scholarly journals Possibility of Advanced Modified-Silica-Based Porous Materials Utilisation in Water Adsorption Processes—A Comparative Study

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 368
Author(s):  
Karol Sztekler ◽  
Agata Mlonka-Mędrala ◽  
Nezar H. Khdary ◽  
Wojciech Kalawa ◽  
Wojciech Nowak ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Porous Materials ◽  
Silica Gel ◽  
Water Adsorption ◽  
Gas Adsorption ◽  
Simultaneous Thermal Analysis ◽  
Flash Method ◽  
Diffusivity Coefficient ◽  
Dynamic Vapor Sorption ◽  
Thermal Diffusivity Coefficient

Due to a high risk of power outages, a heat-driven adsorption chillers are gaining the attention. To increase the efficiency of the chiller, new adsorbents must be produced and examined. In this study, four newly developed silica–based porous materials were tested and compared with silica gel, an adsorber commonly paired with water. Extended sorption tests using mercury intrusion porosimetry, gas adsorption, and dynamic vapor sorption were performed. The morphology of the samples was determined using a scanning electron microscope. The thermal properties were defined using simultaneous thermal analysis and a laser flash method. Metal organic silica (MOS) nanocomposites analysed in this study had thermal properties similar to those of commonly used silica gel. MOS samples have a thermal diffusivity coefficient in the range of 0.17–0.25 mm2/s, whereas silica gel of about 0.2 mm2/s. The highest water adsorption capacity was measured for AFSMo-Cu and equal to 33–35%. For narrow porous silica gel mass uptake was equal about 25%. In the case of water adsorption, it was observed that the pore size of the sorbent is essential, and adsorbents with pore sizes higher than 5 nm, are most recommended in working pairs with water.

Transient methods for the measurement of thermophysical properties: The pulse transient method

2002 ◽  
Vol 34 (5) ◽  
pp. 505-514 ◽  
Author(s):  
L'udovít Kubičár ◽  
Vlastimil Boháč ◽  
Viliam Vretenár
Keyword(s):  
Thermophysical Properties ◽  
Transient Method ◽  
Pulse Transient Method ◽  
Transient Methods

A COMPARISON OF THE VARIOUS PARAMETERS EMPLOYED IN THE VARIABLE‐FREQUENCY INDUCED‐POLARIZATION METHOD

Geophysics ◽  
1964 ◽  
Vol 29 (3) ◽  
pp. 425-433 ◽  
Author(s):  
Philip G. Hallof
Keyword(s):  
Induced Polarization ◽  
Frequency Effect ◽  
Variable Frequency ◽  
Transient Method ◽  
Polarization Method ◽  
Applied Current ◽  
Frequency Method ◽  
Pulse Transient Method ◽  
Factor Data ◽  
The Time Domain

The increased use of the induced‐polarization method in recent years has resulted in two methods of measurement. The measurements in the frequency domain (variable‐frequency method) rely on changes in the apparent resistivities measured as the frequency of the applied current is varied. The measurement in the time domain (pulse‐transient method) detects transients in the measured potentials when the applied current is interrupted. The “chargeability” is the parameter used in the pulse‐transient method, while both the “frequency effect” and the normalized parameter “metal factor” are used in the variable‐frequency method. The most useful parameter would be the one which best indicates the amount of metallic mineralization present. Eight sets of field results from variable‐frequency field surveys are shown. The cases are shown in pairs; in each pair, the geometry of the source is much the same. By comparing the resistivity, the frequency effect (chargeability), and metal‐factor data with the amount of mineralization indicated by the drilling results, the usefulness of these parameters can be evaluated.

Sign in / Sign up

Export Citation Format

Share Document