Wind tunnel for studies of latent heat storage

0482238 - ÚT 2019 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Tesař, Václav
Wind tunnel for studies of latent heat storage.
EPJ Web of Conferences. Vol. 180. Les Ulis: EDP Sciences, 2018 - (Dančová, P.), č. článku 02108. E-ISSN 2100-014X.
[Experimental Fluid Mechanics 2017. Mikulov (CZ), 21.11.2017-24.11.2017]
Grant CEP: GA ČR(CZ) GA17-08218S
Institucionální podpora: RVO:61388998
Klíčová slova: latent heat * wind tunnel * paraffins
Obor OECD: Fluids and plasma physics (including surface physics)
https://www.epj-conferences.org/articles/epjconf/abs/2018/15/epjconf_efm2018_02108/epjconf_efm2018_02108.html

When a heated solid body temperature reaches the melting point, temperature stops increasing and remains constant until the whole body is completely molten. The heat input during this melting is spent on freeing the body molecules. This latent heat of melting remains inside the body and may be released when the body is cooled and solidifies. This heat was suggested, already several decades ago, for storing thermal energy. The advantage it offers is avoiding high temperature differences - which otherwise decrease effectiveness of storage (by inevitable heat escape by conduction). Also the mass of the body needed to store a given amount of heat is much smaller. For investigations of the melting and solidification processes a special wind tunnel has been designed and is being built in this study. The tested sample of phase change material, encapsulated in a spherical shell, will be exposed in the tunnel to recirculating hot air flow in a 140 mm x 140 mm test section. Sudden decrease in air flow temperature is made by shifting away the whole closed-circuit part of the tunnel and exposing the test section to flow of cold (room temperature) air.
Trvalý link: http://hdl.handle.net/11104/0279359