To download article.DOI: 10.15507/2658-4123.032.202201.110-125
Energy-Independent Heating System with Improved Energy Efficiency for Agricultural Premises
Alexey P. Levtsev
Head of the Chair of Heat and Power Systems of Institute of Mechanics and Power Engineering, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russian Federation), Dr.Sci. (Engr.), Professor, ORCID: https://orcid.org/0000-0003-2429-6777, Researcher ID: B-8620-2019, This email address is being protected from spambots. You need JavaScript enabled to view it.
Anatoly I. Lysyakov
Senior Lecturer of the Chair of Heat and Power Systems of Institute of Mechanics and Power Engineering, National Research Mordovia State University (68 Bolshevistskaya St., Saransk 430005, Russian Federation), ORCID: https://orcid.org/0000-0002-4436-4995, This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
Introduction. The article is concerned with increasing the efficiency of energy-independent heat supply systems in agriculture through using a heat recovery unit with a thermomechanical energy converter. The most promising is a thermomechanical energy converter with a thermodynamic cycle of periodic action to drive a diaphragm pump. For heaters and boilers, the use of pulsating mode of the heat carrier has a double effect: it increases heat transfer and reduces the formation of deposits on the heat transfer surfaces.
Materials and Methods. Using the thermodynamic method and the possibilities of impulse technologies, a thermodynamic cycle and a device of periodic action were proposed. In this device, three thermodynamic processes are sequentially implemented: isochoric heating and evaporation of the working substance, adiabatic performance of work, and isobaric condensation. Thermodynamic cycles are constructed for five known working substances (R11; R21; R113; R114; R123) on lgP-h thermodynamic state diagrams and their parameters at characteristic points are calculated.
Results. There has been performed frequency matching of the thermal-mechanical converter with the hydraulic parameters of the heat source and heat-consuming unit. Such matching was based on the frequency responses. To describe the hydrodynamics of the heat supply system, a system of differential equations with constant coefficients was used, which was solved using the Laplace transformation. A rational frequency of oscillations of the heat carrier flow was determined within the range of 1.38–2.76 rad/s.
Discussion and Conclusion. A scheme of a heat supply system with the independent connection of the heat-consuming unit to a heat source is proposed. On the example of a heat source with a power of 100 kW, graphical dependences of the heat source minimum pressures on the change in the consumption of a heat carrier and the active hydraulic resistance of the heat network are obtained. An algorithm for determining the power increment from the use of a heat exchanger with a thermomechanical converter is proposed. It has been determined that the efficiency of the heat recovery unit will be higher for low-power boilers.
Keywords: energy-independent heat supply system, agricultural facilities, heat exchanger, thermomechanical energy converter, pulsating mode
The authors declare no conflict of interest.
For citation: Levtsev A.P., Lysyakov A.I. Energy-Independent Heating System with Improved Energy Efficiency for Agricultural Premises. Inzhenernyye tekhnologii i sistemy = Engineering Technologies and Systems. 2022; 32(1):110-125. doi: https://doi.org/10.15507/2658-4123.032.202201.110-125
Contribution of the authors:
A. P. Levtsev – writing a model in the form of energy chain, analysis and revision of the text.
A. I. Lysyakov – preparation of the text with subsequent revision, analysis of literary data.
All authors have read and approved the final manuscript.
Submitted 17.01.2022; approved after reviewing 10.02.2022;
accepted for publication 21.02.2022
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