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Increasing energy efficiency of the bakery processes and installations by integration of the cogeneration

Author: Chelmenciuc Corina
Degree:doctor of engineering
Speciality: 05.14.01 - General power engineering, power systems
Scientific advisers: Valentin Musteaţa
doctor habilitat, professor, Technical University of Moldova
Valentin Arion
doctor habilitat, professor, Technical University of Moldova
Institution: Technical University of Moldova


The thesis was presented on the 28 November, 2016
Approved by NCAA on the 16 February, 2017


Adobe PDF document0.44 Mb / in romanian


CZU [620.9+536.7]:664.65(478)(043.2)

Adobe PDF document 10.55 Mb / in romanian
159 pages


thermodynamic irreversibility, energy efficiency, exergy efficiency, bakery oven, cogeneration installation, concept “CogIntegr”, degree of thermodynamic perfection


Thesis structure: The paper consists of an introduction, four chapters, general conclusions and recommendations, 153 references, which includes 11 annexes, 159 pages, 41 figures and 29 tables. The obtained results are published in 10 scientific papers.

Field of study – technical sciences.

The purpose of the thesis: to demonstrate that the integration of cogeneration in bakery processes of the tunnel ovens reduce the process irreversibility of obtaining the gas, increasing the energy, exergy and economic efficiency of bakery installations.

Objectives of the paper: the study of energetic analysis methods of technological processes and installations for elaboration of a relevant method for assessing energy efficiency of technological installation of “CogIntegr” type; the assessing of energy, exergy and economic efficiency of those installations.

Scientific novelty and originality of the work. It was proposed and developed a new concept “CogIntegr” - which is refered to integration of classical cogeneration in industrial technological system, which leads to the increase of its energy efficiency.

Important scientific problem solved is to demonstrate that the application of CogIntegr concept allowed to account the lost energetic potential in the obtaining process of the thermal agent in the ovens with recirculation of combustion gases, which contributed to increasing energy efficiency of the processes and installations, with the purpose of subsequent application of this concept for other industrial installations.

Theoretic importance. This thesis brings a scientific contribution in an area of great interest – the energy efficiency and promoting cogeneration. There were proposed: a new conception for increasing the energy efficiency of technological processes and methods for assessing of energy, exergy and economic efficiency.

The practical value of the work. It was demonstrated that the integration of cogeneration based on the use of internal combustion engine, in bakery processes improves their energy efficiency, causing valuable net savings; it was demonstrated that the proposed CogIntegr concept can be applied in any technological process, were are used combustion gas acting as of heating agent. It was also designed a specialized program for assessing economic efficiency of implementation of the CogIntegr technology.

The scientific results of this thesis are used within the Institutional Research Project Towards Moldova's energy autonomy „AUTOEN” (Project nr. 50 inst, 2015-2018), and the research results of this thesis are used in the didactic process at many specialties at the Energy and Electrical Engineering Faculty (Anex 10).