TY - JOUR
T1 - A limitation to determine heat transfer of water at supercritical pressure
T2 - The repeatability issue
AU - Ferrand, Thomas
AU - Oettig, Jan
AU - Schäfer, Laura
AU - Gschnaidtner, Tobias
AU - Naja, Mohamad Omar
AU - Wieland, Christoph
AU - Spliethoff, Hartmut
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/1/25
Y1 - 2023/1/25
N2 - As the heat transfer is based on physical processes which are expected to be deterministic, a major anticipation is that the experimental data should show good repeatability, if not reproducibility. In other words, it is expected that repetition of experiments with very similar inputs (bulk pressure and enthalpy, mass flow rate, heat flux …), should result in consistent and very similar outputs (heat transfer coefficient or inside wall temperature). However, comparable experiments with supercritical water in the literature, although rather scarce, as well as the experimental work conducted at the Chair of Energy Systems at the Technical University of Munich tend to show that repeatable or reproducible data are difficult to obtain. This is the case particularly within the pseudo-critical region where DHT is likely to occur. This may impair the ability to assess accurately the overheating of the piping in critical cases, and therefore the safety of the concerned plants. This paper aims to focus on this problem from an experimental perspective, trying to identify both the magnitude of the phenomenon as well as at which parameters non-reproducibility occurs.
AB - As the heat transfer is based on physical processes which are expected to be deterministic, a major anticipation is that the experimental data should show good repeatability, if not reproducibility. In other words, it is expected that repetition of experiments with very similar inputs (bulk pressure and enthalpy, mass flow rate, heat flux …), should result in consistent and very similar outputs (heat transfer coefficient or inside wall temperature). However, comparable experiments with supercritical water in the literature, although rather scarce, as well as the experimental work conducted at the Chair of Energy Systems at the Technical University of Munich tend to show that repeatable or reproducible data are difficult to obtain. This is the case particularly within the pseudo-critical region where DHT is likely to occur. This may impair the ability to assess accurately the overheating of the piping in critical cases, and therefore the safety of the concerned plants. This paper aims to focus on this problem from an experimental perspective, trying to identify both the magnitude of the phenomenon as well as at which parameters non-reproducibility occurs.
KW - Deteriorated heat transfer
KW - Heat transfer correlations
KW - Repeatability
KW - Supercritical fluids
UR - http://www.scopus.com/inward/record.url?scp=85141231009&partnerID=8YFLogxK
U2 - 10.1016/j.applthermaleng.2022.119357
DO - 10.1016/j.applthermaleng.2022.119357
M3 - Article
AN - SCOPUS:85141231009
SN - 1359-4311
VL - 219
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
M1 - 119357
ER -