THERMAL SCIENCE

International Scientific Journal

Jelena Topić-Božič

,

Simon Muhič

,

Mirko S. Komatina

,

Milica M. Perić

,

Jože Dimnik

LIFE CYCLE ASSESSMENT OF ENERGY GREEN TRANSITION GOALS IN SLOVENIA AND SERBIA: HEAT PUMP EXAMPLE

ABSTRACT
For accelerating hypersonic vehicles, it is important to understand the effects of various factors on heat transfer deterioration. The heat transfer characteristics of supercritical n-decane with pyrolysis were numerically simulated inside a vertical tube. The effects of flow direction, mass-flow rate, heat flux, inlet temperature, and flight acceleration on the heat transfer characteristics were investigated. When the inlet temperature was relatively low or the fluid was decelerated vertically upward, a typical M-shaped velocity distribution was formed, indicating the heat transfer deterioration. Furthermore, the decrease in wall heat flux, as well as the increase in mass-flow rate, inlet temperature and flight acceleration in the same direction as the flow makes the heat transfer deterioration gradually disappear. Finally, a new relationship was established between the heat flux and the flight acceleration and inlet temperature to determine critical heat flux under which heat transfer deterioration developed in the upward flow.
KEYWORDS
life cycle assessment, decarbonization, heat pumps, Slovenia, Serbia, green transition
PAPER SUBMITTED: 2024-06-18
PAPER REVISED: 2024-08-02
PAPER ACCEPTED: 2024-08-18
PUBLISHED ONLINE: 2024-10-12
DOI REFERENCE: https://doi.org/10.2298/TSCI240618222T
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 6, PAGES [4709 - 4721]
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Life cycle assessment of energy green transition goals in Slovenia and Serbia: Heat pump example

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence