Classification of local exergetic losses in heat recovery systems of different types
DOI:
https://doi.org/10.31548/energiya1(65).2023.005Abstract
The results of classification and analysis of local exergy losses in heat recovery systems of various types are presented. The combined heat recovery system of a boiler plant, designed for heating water and blast air, as well as heat recovery systems with anti-corrosion methods for protecting gas exhaust tracts, are considered. On the examples of these systems, a classification of local exergy losses was carried out and their type and place in heat recovery systems were established. For research, a complex methodology was used, combining structural-variant methods of exergy analysis with methods for presenting exergy balances in matrix form. Structural diagrams of heat recovery systems are presented and exergy equations are obtained for calculating exergy losses in places of localization. For a combined heat recovery system, a comparative analysis of local exergy losses was carried out. It has been established that the smallest exergy losses are observed in the hot air heat exchanger and in the gas heater. The total contribution to the total exergy losses of the pumping system and the piping system is quite significant for all boiler power values. With an increase in boiler power from 30 to 70% of the installed power, there is a slight increase in exergy losses in the heat recovery system and in the hot water heat recovery unit. In this section, the main exergy losses are in the pumping system and in the pipeline system. With a further increase in the power of the boiler, the exergy losses in the heat recovery system and in the hot water heat recovery unit begin to increase more significantly. In this case, the main exergy losses fall on the hot water heat exchanger. It is concluded that the optimal mode of operation of the installation is carried out at the boiler power, which is 50 ... 60% of its installed power.
Key words: heat recovery systems; local exergy losses; classification of exergy losses
References
Calise F., Accadi, M., Macaluso A., Piacentino A., Vanoli L. Exergetic and exergoeconomic analysis of novel hybrid solar–geothermal polygeneration system producing energy and water. Energy Convers. Manag. 2016. 115. P.200 -220.
Sahin A. Z. Importance of Exergy Analysis in Industrial Processes. 2014 URL: https: // www. researchgate. net / publication / 228988818.
Zare V., Moalemian A. Parabolic trough solar collectors integrated with a Kalina cycle for high temperature applications. Energy, exergy and economic analyses. Energy Conversion and Management. 2017. 151. P.681-692. DOI:10.1016/j.enconman.2017.09.028.
Picallo-Perez A., Sala J. M., Tsatsaronis G., Sayadi S. “Advanced Exergy Analysis in the Dynamic Framework for Assessing Building Thermal Systems”. Entropy. 2019. Vol. 22. 1. P. 32, DOI: 10.3390/e22010032.
Sayadi S., Tsatsaronis G., Morosuk T. “Splitting the dynamic exergy destruction within a building energy system in-to endogenous and exogenous parts using measured data from the building automation system”, Int. J. Energy Res. 2020. Vol. 44. 6. P. 4395–4410, doi: 10.1002/er.5213.
Seyitoglu SS., Dincer I., Kilicarslan A. Energy and exergy analyses of hydrogen production by coal gasification. International Journal of Hydrogen Energy. 2017. № 42. P.2600.
Taner T. Energy and exergy analyze of PEM fuel cell: A case study of modeling and simulations. Energy. 2018. №143. P.284-294.
Fialko N., Stepanova A., Navrodska R., Meranova N., Sherenkovskii J. Efficiency of the air heater in a heat recovery system at different thermophysical parameters and operational modes of the boiler. Eastern-European Journal of Enterprise Technologies. 2018. 6/8 (96). P. 43-48. DOI: 10.15587/1729-4061.2018.147526.
Stepanova, A. Analysis of the application combined heat recovery systems for water heating and blast air of the boiler unit. Industrial Heat Engineering, 2016. 38(4). 38-46. DOI: https://doi.org/10.31472/ihe.4.2016.06.
Fialko N., Stepanova A., Navrodska R., Shevchuk S. Comparative analysis of exergetic efficiency of methods of protection of gas exhaust tracks of boiler installations Eastern-European Journal of Enterprise Technologies. 2021. 3/8 (111). P.42-49. DOI: 1015587/1729. 4061.2021/234026
Fialko N., Stepanova A., Navrodska R., Gnedash G., Shevchuk S. Complex metods for analysis of efficiency and optimization of heat-recovery system. Scientific and innovation. 2021. 17(4). P.11-18. DOI.org/ 10.15407/scine17.04.011 ISSN 1815-2066.
Downloads
Published
Issue
Section
License
Relationship between right holders and users shall be governed by the terms of the license Creative Commons Attribution – non-commercial – Distribution On Same Conditions 4.0 international (CC BY-NC-SA 4.0):https://creativecommons.org/licenses/by-nc-sa/4.0/deed.uk
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
