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Argumentation of the operating regimes and of the constructive-technological parameters of the automated ecological installation with natural and artificial cold for milk cooling


Author: Daicu Anatolie
Degree:doctor of engineering
Speciality: 05.20.02 - Electrification and Automation of Agriculture
Year:2021
Scientific adviser: Liviu Volconovici
doctor habilitat, professor, Agrarian State University of Moldova
Institution: Agrarian State University of Moldova

Status

The thesis was presented on the 15 January, 2021
Approved by NCAA on the 26 February, 2021

Abstract

Adobe PDF document – 1.12 Mb / in romanian
Adobe PDF document – 1.30 Mb / in english

Thesis

CZU 621.56/.57+637.117(043.3)

Adobe PDF document 5.04 Mb / in romanian
155 pages

Keywords

refrigeration system, water accumulator, natural cold, milk cooling, energy efficiency automatic graphs, operating algorithm

Summary

The structure of the thesis includes introduction, three chapters, conclusions and recommendations, list of references from 113 sources, 6 appendixes, 117 pages of the main text, 47 figures, 15 tables, 127 formulas. The research results are reflected in 24 scientific papers, including a monograph, 7 articles in international journals, 16 articles in national journals.

The main goal of this research consists in the argumentation of the methodology of cooling milk with natural and artificial cold by defining the constructive-technological parameters of the automated ecological installation.

The objectives: improving the technical, energetical and economical indices of the combined refrigeration system by using natural and artificial refrigeration; reducing the electrical power of the combined refrigeration system; the significant reduction in the specific consumption of electricity required for cooling milk; improving the operating regimes and proving the constructive and technological parameters of the installations with natural and artificial cold for cooling the milk; evaluation of the effectiveness of the use of installations with natural and artificial cold for cooling the milk taking into account the failure of electrical equipment.

The scientific innovation consists in the methodological substantiation of the use of natural and artificial cold in the milk cooling machine and in the size of the cold accumulator which allows the argumentation of the constructive and technological parameters of the automated ecological installation.

The important scientific problem solved: improving the technical, energetical and economical indices of the combined refrigeration installation by using natural and artificial cold based on the mathematical model developed and in correlation with the law of atmospheric air temperature distribution for the area in the center of the Republic of Moldova.

The theoretical importance of the paper consists in the methodological contribution to the determination of the optimal parameters of the combined refrigeration installation for the Republic of Moldova, which ensures a saving of energy resources. The practical importance: the refrigeration system with natural and artificial cold was modernized with optimizing the technological constructive parameters of the cold accumulator.

Implementation of scientific results. The research results were implemented within the institutional project MIS ETC 1549:” Promoting sustainable production and implementing good practices in the farms from the cross-border area Romania, the Republic of Moldova and Ukraine”. The theoretical component of the research is implemented within the project 20.80009.5107.04:”Adaptation of sustainable and ecological technologies for fruit production in terms of quantity and quality according to the integrity of the crop system and climate change” for the period of 2020-2023.

The theoretical approach of the research is used in the lecture courses "Renewable energy sources in the agricultural sector" and "Design of electrification systems in the agricultural sector" for students of years 3 and 4 of the Faculty of Agricultural Engineering and Auto Transport within SAUM.