CALCULATION OF HEAT CAPACITY IN MEAT DURING  ITS FREEZING CONSIDERING PHASE CHANGE

As a consequence of insufficient study of water phase change in meat accompanied by water crystallization, its modeling is currently based on the empirical dependence of the frozen water portion on temperature. Such model does not allow answering a number of questions such as of metrological order, and also of physicochemical interpretation of processes occurring in meat during water crystallization. In this paper, we propose an approach to modeling the phase change process of meat during its freezing on the basis of the phonon theory of Debye crystallization, which allows to obtain physically justified dependences of heat capacity on temperature in the phase change region. The obtained dependences may serve as a simple method for calculating the heat capacity of meat in the temperature range of 113 K to the cryoscopic temperature of the given meat type, or as a basis for the analysis and correction of factors affecting the meat freezing in the temperature range of the phase change.

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Factors affecting phase-change paint heat-transfer data reduction with emphasis on wall temperatures approaching adiabatic conditions

10.2514/6.1972-1030 ◽

1972 ◽

Cited By ~ 1

Author(s):

D. STONE ◽

J. HARRIS ◽

D. THROCKMORTON ◽

V. HELMS, III

Keyword(s):

Heat Transfer ◽

Phase Change ◽

Data Reduction ◽

Factors Affecting ◽

Transfer Data ◽

Adiabatic Conditions

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Ideal–Gas Thermochemical Properties for Alkanolamine and Related Species Involved in Carbon Capture Applications

10.26434/chemrxiv.12743552 ◽

2020 ◽

Author(s):

Nayyereh hatefi ◽

William Smith

Keyword(s):

Heat Capacity ◽

Electronic Structure ◽

Co2 Capture ◽

Carbon Capture ◽

Ideal Gas ◽

Thermochemical Properties ◽

Temperature Range ◽

Comparison Results ◽

Electronic Structure Methods ◽

Protonated Forms

<div>Ideal{gas thermochemical properties (enthalpy, entropy, Gibbs energy, and heat capacity, Cp) of 49 alkanolamines potentially suitable for CO2 capture applications and their carbamate and protonated forms were calculated using two high{order electronic structure methods, G4 and G3B3 (or G3//B3LYP). We also calculate for comparison results from the commonly used B3LYP/aug-cc-pVTZ method. This data is useful for the construction of molecular{based thermodynamic models of CO2 capture processes involving these species. The Cp data for each species over the temperature range 200 K{1500 K is presented as functions of temperature in the form of NASA seven-term polynomial expressions, permitting the set of thermochemical properties to be calculated over this temperature range. The accuracy of the G3B3 and G4 results is estimated to be 1 kcal/mol and the B3LYP/aug-cc-pVTZ results are of nferior quality..</div>

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Relationship between Heat Capacity and Topological Characteristics of Molecules in a Series of Gaseous Substituted Derivatives of Alkenes at a Pressure of 100 kPa and in the Temperature Range from 298.15 to 1000 K

Theoretical Foundations of Chemical Engineering ◽

10.1134/s0040579520040168 ◽

2020 ◽

Vol 54 (4) ◽

pp. 624-630

Author(s):

M. Yu. Dolomatov ◽

T. M. Aubekerov ◽

E. V. Vagapova ◽

K. R. Akhtyamova

Keyword(s):

Heat Capacity ◽

Temperature Range ◽

Topological Characteristics ◽

Derivatives Of

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Simplified relations for the phase change process in spherical geometry

International Journal of Heat and Mass Transfer ◽

10.1016/0017-9310(85)90239-x ◽

1985 ◽

Vol 28 (4) ◽

pp. 884-885 ◽

Cited By ~ 2

Author(s):

Luiz F. Milanez

Keyword(s):

Phase Change ◽

Change Process ◽

Spherical Geometry ◽

Phase Change Process

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Testing a Gypsum Composite Based on Raw Gypsum with a Direct Admixture of Paraffin and Polymer to Improve Thermal Properties

Materials ◽

10.3390/ma14123241 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3241

Author(s):

Krzysztof Powała ◽

Andrzej Obraniak ◽

Dariusz Heim

Keyword(s):

Thermal Conductivity ◽

Heat Capacity ◽

Thermal Properties ◽

Phase Change ◽

Large Scale ◽

Building Materials ◽

Residential Buildings ◽

Energy Performance ◽

Polymer Content ◽

Volumetric Heat Capacity

The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test.

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