scholarly journals The calculation of thermodynamic functions for simulation model of the column string-emulsion reactor

2020 ◽  
pp. 33-41
Author(s):  
Pavel Sechenov ◽  
Inna Rybenko ◽  
Valentin Tsymbal
Keyword(s):  
Simulation Model ◽  
Thermodynamic Functions ◽  
Thermal Capacity ◽  
Specific Enthalpy ◽  
Heat Transmission ◽  
Degree Polynomial ◽  
Temperature Changes ◽  
Logic Diagram ◽  
Uml Class Diagram ◽  
Enthalpy And Entropy

The simulation model of the column string-emulsion reactor previously suggested that the temperature does not change on the height of reactor and over time is consistent. The assessment of temperature changes in the reactor requires the knowledge on the amount of heat necessary to heat up the particles, absorbed or emitted in the course of chemical reactions, as well as the speed of heat transmission in space. The possibility of calculating these parameters for each floating particle in online regime is limited by the operating speed of the computer system. For accelerating the calculations, the author creates the database of these parameters for all substances involved in the reactions. In these circumstances, enthalpies and entropies were expressed in through the specific thermal capacity calculated based on the fifth degree polynomial. The coefficient values of the polynomial and phase transitions were taken from the reference books. The article provides an algorithm in form of the logic diagram for calculating the specific enthalpy of the particle. Based on the developed algorithm, the author creates the software that allows calculating thermodynamic functions. The interaction between the classes are demonstrated in the UML class diagram. The research presents the calculations of specific enthalpy and entropy for substances in the interval of temperatures of 298-1850 K. Variations of the values of enthalpy and entropy at the temperature of 1700 K compared to the reference values do not exceed 1.2 %.

scholarly journals Temperature dependence of the specific heat and thermodynamic functions AК1М2 alloy, doped strontium

2019 ◽  
Vol 21 (1) ◽  
pp. 35-42 ◽  
Author(s):  
I. N. Ganiev ◽  
S. E. Otajonov ◽  
N. F. Ibrohimov ◽  
M. Mahmudov
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Specific Heat Capacity ◽  
Thermodynamic Functions ◽  
Inverse Relationship ◽  
Alloying Element ◽  
Enthalpy And Entropy ◽  
Increasing Temperature

In the heat «cooling» investigated the temperature dependence of the specific heat capacity and thermodynamic functions doped strontium alloy AK1М2 in the range 298,15—900 K. Mathematical models are obtained that describe the change in these properties of alloys in the temperature range 298.15—900 K, as well as on the concentration of the doping component. It was found that with increasing temperature, specific heat capacity, enthalpy and entropy alloys increase, and the concentration up to 0.5 wt.% of the alloying element decreases. Gibbs energy values have an inverse relationship, i.e., temperature — decreases the content of alloying component — is up to 0.5 wt.% growing.

scholarly journals Solubility of Butylated Hydroxytoluene (BHT) in Aqueous and Alcohol Solutions from 293.15 to 313.15 K

2014 ◽  
Vol 28 ◽  
pp. 48-58 ◽  
Author(s):  
Shipra Baluja ◽  
Kapil Bhesaniya ◽  
Rahul Bhalodia ◽  
Sumitra Chanda
Keyword(s):  
Gibbs Energy ◽  
Thermodynamic Functions ◽  
Butylated Hydroxytoluene ◽  
Solubility Data ◽  
Different Temperatures ◽  
Enthalpy And Entropy

The solubility of Butylated hydroxyl toluene in aqueous and alcohol solutions were determined at different temperatures (293.15 to 313.15) K. Using Van’t Hoff and Gibb’s equations, some thermodynamic functions such as Gibbs energy, enthalpy and entropy of dissolution, and of mixing of Butylated hydroxyl toluene in aqueous and alcohol solutions, were evaluated from solubility data. The solubility was greater in butanol and minimum in water. The enthalpies, entropy and Gibb’s energy of dissolution were positive for all solvents.

The specific enthalpy and entropy of the vapours of alkali-metal binary eutectics at high temperatures

1995 ◽  
Vol 27/28 (1) ◽  
pp. 59-65
Author(s):  
Vladimir M Anisimov ◽  
Nikolai I Sidorov ◽  
Evgenii L Studnikov
Keyword(s):  
Alkali Metal ◽  
High Temperatures ◽  
Specific Enthalpy ◽  
Enthalpy And Entropy

scholarly journals Thermal Time Constant of PV Roof Tiles Working under Different Conditions

2019 ◽  
Vol 9 (8) ◽  
pp. 1626 ◽  
Author(s):  
Kurz ◽  
Nawrowski
Keyword(s):  
Energy Balance ◽  
Thermal Resistance ◽  
Temperature Change ◽  
Environmental Parameters ◽  
Thermal Capacity ◽  
Electrical Characteristics ◽  
Legal Regulations ◽  
Temperature Changes ◽  
Different Types ◽  
The Relationship

This paper presents different types of photovoltaic (PV) roof tiles integrating PV cells with roof covering. Selected elastic photovoltaic roof tiles were characterised for their material and electrical characteristics. Practical aspects of using PV roof tiles are discussed, alongside the benefits and drawbacks of their installation on the roof. Thermal resistance, heat transfer coefficient and thermal capacity were identified for elastic PV roof tiles and roof construction built of boards and PV roof tiles, according to valid standards and legal regulations. The resistance–capacity (RC) models of PV roof tiles and roofs are proposed according to the time constants identified for the analysed systems. The energy balance of the studied systems (PV roof tiles alone and the roof as a whole) is presented, based on which temperature changes in the PV cells of the roof tiles working under different environmental conditions were identified. The timing of PV cells’ temperature change obtained by material data and energy balance analyses were compared. The relationship between the temperature change times of PV cells and the thermal resistance and heat capacity of the whole system are demonstrated, alongside environmental parameters.

scholarly journals Study on evolution characteristics of overburden caving and void during multi-horizontal sectional mining in steeply inclined coal seams

2020 ◽  
Vol 24 (6 Part B) ◽  
pp. 3915-3921
Author(s):  
Wen-Hua Yang ◽  
Xing-Ping Lai ◽  
Jian-Tao Cao ◽  
Hui-Cong Xu ◽  
Xian-Wei Fang
Keyword(s):  
Fractal Dimension ◽  
Simulation Model ◽  
Coal Mine ◽  
Void Ratio ◽  
Physical Simulation ◽  
Thermal Image ◽  
Mine Pressure ◽  
Coal Seams ◽  
Temperature Changes ◽  
Evolution Characteristics

In this paper, the evolution characteristics of overburden caving and void during multi-horizontal sectional mining in steeply inclined coal seams are studied. Based on the typical engineering background of steeply inclined coal seams mining in Wudong Coal Mine, the physical simulation model is build. The evolution characteristics of overburden caving and void during multi-horizontal sectional mining is systematically studied, combined with the monitoring data of overburden infrared thermal image, void ratio, void network fractal dimension, and peak mine pressure. It is showed that, during multi-horizontal sectional mining in steeply inclined coal seams, the movement rule of overburden is extremely complicated, and the temperature changes in infrared thermal image were significant.

Fundamentals of Heat Transmission through the External Walls of Buildings

1965 ◽  
Vol 7 (4) ◽  
pp. 357-366 ◽  
Author(s):  
A. W. Pratt
Keyword(s):  
Heat Flux ◽  
Ambient Temperature ◽  
Constant Temperature ◽  
Thermal Capacity ◽  
Open Cavity ◽  
The Other ◽  
Heat Transmission ◽  
Theoretical Examination ◽  
Air Space

A theoretical examination is made of heat transmission through a wall exposed on one side to the weather and on the other facing an enclosure at a uniform and constant temperature. It is shown how the heat flux may be calculated exactly to take account of orientation, different degrees of exposure, and of air space ventilation in open cavity structures. The thermal capacity of the wall is considered by calculating solutions for transient and steady periodic variations in the ambient temperature at the weather surface.

scholarly journals Thermodynamic study of the solubility of ibuprofen in acetone and dichloromethane

2010 ◽  
Vol 46 (2) ◽  
pp. 227-235 ◽  
Author(s):  
Diana Marcela Aragón ◽  
Jaiver Eduardo Rosas ◽  
Fleming Martínez
Keyword(s):  
Hydrogen Bonds ◽  
Gibbs Energy ◽  
Transfer Process ◽  
Thermodynamic Functions ◽  
Thermodynamic Quantities ◽  
Dipolar Interactions ◽  
Solvent Interactions ◽  
Solution Processes ◽  
Enthalpy And Entropy ◽  
Solvation Processes

Thermodynamic functions, Gibbs energy, enthalpy and entropy for the solution processes of ibuprofen (IBP) in acetone and dichloromethane (DCM) were calculated from solubility values obtained at temperatures ranging from 293.15 K to 313.15 K. The respective thermodynamic functions for mixing and solvation processes as well as the activity coefficients for the solute were calculated. IBP solubility was high and proved similar in both solvents but was greater in DCM than acetone. In addition, the thermodynamic quantities for the transfer process of this drug from cyclohexane to the organic solvents were also calculated in order to estimate the contributions of hydrogen-bonds or of other dipolar interactions. The results were discussed in terms of solute-solvent interactions.

scholarly journals Temperature dependence of the heat capacity and change in the thermodynamic functions of strontium-alloyed AK1M2 alloy

2018 ◽  
Vol 4 (3) ◽  
pp. 119-124
Author(s):  
Izatullo N. Ganiev ◽  
Suhrob E. Otajonov ◽  
Nasim F. Ibrohimov ◽  
M. Mahmudov
Keyword(s):  
Heat Capacity ◽  
Gibbs Energy ◽  
Mathematical Models ◽  
Specific Heat ◽  
Temperature Dependence ◽  
Thermodynamic Functions ◽  
Temperature Decrease ◽  
Cooling Mode ◽  
Enthalpy And Entropy ◽  
Aluminum Base

The temperature dependence of the specific heat capacity and change in the thermodynamic functions of strontium-alloyed ultrahigh-purity aluminum base AK1M2 alloy have been studied in “cooling” mode over the 298.15–900 K range. Mathematical models describing the evolution of these properties of the alloys in the abovementioned temperature range with change in alloying addition concentration have been obtained. The heat capacity, enthalpy and entropy of the alloys increase with temperature, decrease with an increase in the alloying addition concentration to 0.5 wt.% and grow with a further increase in the alloying addition concentration. The Gibbs energy of the alloys has an inverse dependence: it decreases with an increase in temperature and grows with an increase in the alloying addition concentration to 0.5 wt.%.

Sign in / Sign up

Export Citation Format

Share Document