Author, Institution: Mohab Maher Mahmoud Elsayed Salem, Lithuanian Energy Institute
Science area, field of science: Technological Sciences, Energetics and Power Engineering, T006
Scientific Supervisor: Chief Researcher Dr. Robertas Poškas (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Dissertation Defence Board of Energetics and Power Engineering Science Field:
Chief Researcher Dr. Sigitas Rimkevičius (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006) – chairperson
Prof. Dr. Abdul Ghani Olabi (University of Sharjah, United Arab Emirates, Technological Sciences, Energetics and Power Engineering, T006)
Chief Researcher Dr. Mantas Povilaitis (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Assoc. Prof. Dr. Rytis Skominas (Vytautas Magnus University, Technological Sciences, Environmental Engineering, T004)
Senior Researcher Dr. Raminta Skvorčinskienė (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering, T006)
Dissertation defence meeting will be at the conference room at Lithuanian Energy Institute (Breslaujos 3 – 202, Kaunas)
The doctoral dissertation is available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: M.M.M.E. Salem el. dissertation.pdf
© M. M. M. E. Salem, 2026 “The text of the thesis may not be copied, distributed, published, made public, including by making it publicly available on computer networks (Internet), reproduced in any form or by any means, including, but not limited to, electronic, mechanical or other means. Pursuant to Article 25(1) of the Law on Copyright and Related Rights of the Republic of Lithuania, a person with a disability who has difficulties in reading a document of a thesis published on the Internet, and insofar as this is justified by a particular disability, shall request that the document be made available in an alternative form by e-mail to doktorantura@ktu.lt.”
Annotation: This dissertation experimentally resolves row‑by‑row heat and mass transfer during water vapour condensation from hot humid exhaust air (water vapour mass fraction (WVMF) 10 and 20%, Re = 3000–10000, tg = 85–205 °C) in a serpentine type condensing economiser (ratio water/humid air flow rate ratio (RF) = 1–4). The axial Nusselt number initially decreases due to condensate film and non-condensable gas accumulation, then increases as the film thins. Higher Re and WVMF increase heat transfer; higher inlet temperature reduces it. Optimum waste heat recovery occurs at 85 °C, 20% WVMF, Re = 3000 and RF = 3. A correlation for heat-transfer variation is proposed, and an analytical model is validated against experimental data (outlet temperatures within 1–8% and condensation rate within 24%). This first detailed characterisation of serpentine-type condensing economisers offers practical design tools.
27th of August, 2026, 10:00
Conference room at Lithuanian Energy Institute (Breslaujos 3 – 202)
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