A new calorimeter for measuring thermal conductivity of liquids has been constructed. It is wholly automatic under the computer
control. The time of measurement is 1 s and the temperature rise due to heating is within 1°C. Six organic liquids and six
aqueous solutions of electrolytes were employed as reference standards. The instrument was calibrated at 25°C. Its accuracy
is better then 1% with a precision of about 0.2%.
The present study introduces a volumetric heat and mass source model to investigate the flow field inside the hood and duct
system and optimize the sampling technique in a large scale fire calorimeter. The model was validated using experimental measurements
of the oxygen depletion factor, gas temperature and heat release rate. The calculated heat release rates determined using
the CFD model were in good agreement with the experiments with the maximum discrepancy between the simulations and experiments
being less than 5%. A series of CFD simulations were performed to examine the effects of sampling location, and the number
of sampling points on the uncertainty of the heat release calculation. Detailed flow characteristics were analyzed to understand
the complicated internal duct flow.
Authors:Beata Salamon, Jan Kapała, and Marcelle Gaune-Escard
height) [ 1 ] contains two cavities for one thermopile each and is surrounded by kanthal resistance and kaowool acting as a thermal insulation. Each thermopile is located in a cylindrical bottom-closed tube, a so-called “calorimeter cell” of thin
In this paper, several small-scale screening test methods were discussed on evaluating the thermal hazard of reactive substances.
Generally the sensitivities of DSC and ARC are not high enough to evaluate the thermal hazards for all reactive substance,
especially, for those of complex reactions containing a phase and/or chemical reaction mechanism change in the lower temperature
range. Using the C80, however, the reaction can easily be detected in the lower temperature range due to its high sensitivity.
Therefore, the C80 gives generally more accurate results than DSC and ARC. Data from C80 and Dewar vessel were compared and
it indicates that the Dewar vessel has also high enough sensitivity to evaluate the thermal hazard and determine the heat
flux in lower temperature range of reactive substances.
Classification based on thermal properties and temperature conditions of heat transfer between proper calorimeter andsurrondings
was presented. The dynamic properties of distinguished groups of calorimeters were determined.
Authors:Vratislav Tydlitát, Jan Zákoutský, and Robert Černý
Calorimeters were originally constructed for the measurement of specific heat capacity, and this application remained the most frequent hitherto [ 1 , 2 ]. Their current usage is, however, much wider. The enthalpy
Authors:G. Kotelnikov, S. Moiseyeva, and E. Mezhburd
A modulated capillary titration calorimeter has been developed. New software and optimization of the calorimetric unit CTD2156
are used as a basis of the modulated capillary titration calorimeter. The scanning mode of the calorimeter has been theoretically
substantiated. The scanning of chambers temperature is provided due to the fact that the shield temperature is linearly varied
at heating and cooling. The reversing and kinetic part of the total heat flow are measured at heating of a diluted collagen
solution. The main advantage of the calorimeter is its ability to operate in a modulation mode, in an isothermal mode, in
modes of linear heating and cooling of homogeneous and dispersoid liquid samples at an effective mixing of reagents in calorimetric
Authors:V. García-Cuello, J. Moreno-Pirajan, L. Giraldo-Gutiérrez, K. Sapag, and G. Zgrablich
In this work, it is described an innovative heat flux micro calorimeter Tian-Calvet type designed to measure adsorption heats
and reactions as well as adsorption isotherms. It consists in an adsorption instrument for volumetric gases, which is coupled
to the micro calorimeter. The changes in the pressure are monitored by means of high sensitivity and high precision pressure
transducers. The micro calorimeter has thermo elements that work by a Seebeck effect, in a twin cells system. The cells are
inside a box in which the temperature can be adjusted from 77 to 300 K. The sensitiveness of the calorimeter is established
by applying a perfectly known electric work. The results corresponding to the electric calibration, the base line stability
determination and the time constant in the equipment are shown.
Authors:S. A. Malik, L. Wang, M. A. Paget, F. Biddlestone, and G. F. Fernando
Differential scanning calorimetry is an established technique for characterising the thermal properties of materials. Experiments involving a differential scanning calorimeter (DSC) generally involve the use of