Entropy­based methods applied to the evaluation of a real refrigeration machine

Morozyuk, Larisa; Sokolovska-Yefymenko, Viktoriia; Gayduk, Sergey; Moshkatiuk, Andrii

doi:10.15587/1729-4061.2018.147710

Cited by 2 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This principle is the basis of entropy-statistical analysis. This method makes it possible to determine the necessary energy costs to compensate for the entropy generation as a result of the irreversibility of work processes in various components of refrigeration systems and indicates ways to improve them [13].…”

Section: Analysis Of the Real Marine Refrigeration System Operation B...mentioning

confidence: 99%

EN Thermodynamic analysis of a real marine refrigeration system for cruise ship "Scarlet Lady"

Морозюк

Sokolovska-Yefymenko

Ierin

et al. 2022

RET

View full text Add to dashboard Cite

This paper presents an energy analysis of the marine refrigeration system as a component of the machinery system of the cruise liner “Scalet Lady”. This type of ship is one of the most complex types from an energy point of view, which is associated with a wide variety of energy consumers. The study uses two methods of thermodynamic analysis of real cycles: the method of cycles and entropy-statistical method. For the analysis, the experimental data on the operating modes of the marine refrigeration system has been used. According to the results of processing the experimental data, a thermodynamic cycle has been formed and an energy calculation of the cycle has been performed using classical methods for two-stage refrigeration machines. With the help of the cycle model, the external irreversibility is determined by successively reducing the energy efficiency of the ideal cycle. The Lorentz cycle has been chosen as an ideal model, taking into account the variable temperatures of heat supply and removal during heat exchange “heat source – phase transformations of the refrigerant R407f”. Along with the evaluation of efficiency, the distribution of losses by the components of the refrigeration system has been established, energy weaknesses that require improvement has been identified, and the most effective ways to reduce energy costs have been outlined. Analytical conclusions have a graphical interpretation of the thermodynamic efficiency assessment for the real refrigeration cycle. It has been established that in the considered real cycle of a marine refrigeration system, the greatest influence on energy efficiency is exerted by external irreversibility in the condenser, in particular, in the overheating zone (25.64% of the total energy consumption of the plant). The effect of irreversibility in the compressor is not fixed

show abstract

Section: Analysis Of the Real Marine Refrigeration System Operation B...mentioning

confidence: 99%

EN Thermodynamic analysis of a real marine refrigeration system for cruise ship "Scarlet Lady"

Морозюк

Sokolovska-Yefymenko

Ierin

et al. 2022

RET

View full text Add to dashboard Cite

show abstract

“…The most important asset in these complexes is equipment. Production assets, and above all equipment, must work for the maximum time with the maximum allowable load indicators [21,22]. Effective asset management implies regular preventive maintenance and systematic elimination of losses associated with changeovers, raw materials supply and other processes.…”

Section: Features Of Determining the Efficiency Indicatormentioning

confidence: 99%

Improvement of methods of comprehensive assessment of the operation efficiency of centralized heat supply systems in municipal heat power engineering

Kozlov

Kovalchuk

Klymchuk

et al. 2021

EEJET

View full text Add to dashboard Cite

The possibility of a comprehensive assessment of the efficiency of the operation of a district heating system based on the indicator of the overall efficiency of the equipment OEE (overall equipment efficiency) and its extension to the system as a whole is considered. The disunity of the direction of existing approaches in assessing the efficiency of operation of district heating systems does not allow a comprehensive assessment of the overall efficiency of the functioning of the technological sequence of the entire system. It is proposed to consider efficiency as the probability of full functioning of all elements of the heat supply system. It is shown that the heat output of the boiler house is proportional to the power consumption of the boiler house and is approximated by a periodic function. It is shown that the main element of the heat supply system, which determines its efficiency, is the heat-generating source. As a result of the study, it is determined that the efficiency of the heat-generating source functioning increases as the maximum value of its efficiency is reached. Numerical modeling has shown that the flexible use of the installed heat generator capacity contributes to an increase in the efficiency factor from 0.53 to 0.70 and the overall efficiency of the heat supply system can be increased by more than 30 %. When designing a boiler house, it was recommended to provide for the installation of capacities with gradation 1; 0.5; 0.25. It is shown that the OEE indicator allows one to characterize the efficiency of both the heat supply system as a whole and its individual components, and can be used in the design and analysis of the operation of systems

show abstract

Entropybased methods applied to the evaluation of a real refrigeration machine

Cited by 2 publications

References 7 publications

EN Thermodynamic analysis of a real marine refrigeration system for cruise ship "Scarlet Lady"

EN Thermodynamic analysis of a real marine refrigeration system for cruise ship "Scarlet Lady"

Improvement of methods of comprehensive assessment of the operation efficiency of centralized heat supply systems in municipal heat power engineering

Contact Info

Product

Resources

About

Entropy­based methods applied to the evaluation of a real refrigeration machine

Cited by 2 publications

References 7 publications

EN Thermodynamic analysis of a real marine refrigeration system for cruise ship "Scarlet Lady"

EN Thermodynamic analysis of a real marine refrigeration system for cruise ship "Scarlet Lady"

Improvement of methods of comprehensive assessment of the operation efficiency of centralized heat supply systems in municipal heat power engineering

Contact Info

Product

Resources

About

Entropybased methods applied to the evaluation of a real refrigeration machine