Synthesis of Heat-Exchange Systems with Flows of Variable Heat Capacity Integrated in a Technological Process

2021 ◽  
Author(s):  
A. M. Tsirlin ◽  
A. I. Balunov ◽  
L. G. Gagarina
Keyword(s):  
Heat Capacity ◽  
Heat Exchange ◽  
Technological Process ◽  
Variable Heat

The evaluation of the influence of heat-exchange gas on the uncertainty of specific heat capacity measurement

Metrologiya ◽  
2020 ◽  
pp. 43-52
Author(s):  
Tatiana A. Kompan ◽  
Viktoriya V. Vlasova ◽  
Valentin I. Kulagin
Keyword(s):  
Heat Capacity ◽  
Heat Exchange ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Thermal Capacity ◽  
Heat Capacity Measurement ◽  
Capacity Measurement ◽  
Measuring Procedure ◽  
Correct Expression

The influence of the gas presence in calorimeter on the result of measuring of thermal capacity is considered. The feature of the case is the unavoidable change of the gas mass during measuring procedure. The correct expression for the value of amendment is obtained, and uncertainty is evaluated for the calorimeter КА-С4 that serves as the standard of the unit of heat capacity.

NONISOTHERMAL METASTABILITY IN MESOSCOPIC SYSTEMS

1991 ◽  
Vol 05 (06) ◽  
pp. 447-453 ◽  
Author(s):  
H. DEKKER
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Heat Exchange ◽  
Energy Barrier ◽  
Degrees Of Freedom ◽  
Helmholtz Free Energy ◽  
Nonequilibrium Thermodynamics ◽  
Magnetic Phase ◽  
Planck Equation ◽  
Temperature Dependent

Since the effective potential for noisy “macroscopic” degrees of freedom (e.g. the magnetic phase in Josephson junctions) in general depends on the (local) temperature, it is given thermodynamical significance as the Gibbs or Helmholtz free energy. Using the notions of nonequilibrium thermodynamics a generalized Kramers Fokker-Planck equation is then presented, which includes nonisothermal effects. The escape rate from a metastable state across a temperature-dependent energy barrier is investigated. A substantial entropic barrier enhancement is found for a specimen with small heat capacity and slow heat exchange with its environment (e.g. the helium reservoir).

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