1977 KB34 KB199920252015Carvajal-Mariscal, IgnacioMoreno-Cordobés, Ariel E.Quinto Diez, PedroSánchez-Silva, FlorencioToledo Velázquez, Miguelštevilka:4letnik:61str. 273-282, SI 49ISSN:0039-2480COBISSID:13968155URN:URN:NBN:SI:doc-KJN80GTGenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikdvofazni termosifonieksperimentExperimentizotermni termosifonimerjenje temperatureobročasti termosifoniumerjanjeStudy of an annular two-phase thermosyphon used as an isothermal source in thermometry|The feasibility of using an annular two-phase thermosyphon (TPT) in thermometry was studied experimentally; the main results are presented in this paper. The TPT was conceived as an isothermal source for calibration purposes, using the comparison method. For this purpose, an annular TPT was designed, built and characterized, using water as a working fluid. In order to determine experimentally how isothermal the TPT annular surface can be, eight thermocouples were installed axially on its surface. Tests were performed for two different cooling water flows 16.67 cmsup3/s and 4.17 cmsup3/s. For each cooling water flow, four heat power levels were supplied in the evaporation zone: (38, 154, 350, 1,385) W. The experimental results have shown that the thermal device works isothermal for power levels higher than 350 W, where the so-called bar effect is not present and the temperature measurement error is reducedOpravljena je bila študija uporabnosti obročastega dvofaznega termosifona (TPT) pri merjenju temperature in glavni rezultati toplotne zmogljivosti so predstavljeni v tem članku. Obročasti TPT je zasnovan kot izotermen vir za umerjanje merilnikov temperature po metodi primerjave. V ta namen je bil zasnovan, zgrajen in eksperimentalno okarakteriziran obročast TPT z vodo kot delovnim fluidom. Za eksperimentalno opredelitev delovanja obročaste površine TPT je bilo aksialno po notranji obročasti površini v območju kondenzatorja nameščenih osem termoparov. Toplotno moč je zagotavljal električni upornik v območju uparjalnika in toploto je zbiral pretočni sistem hladilne vode okrog kondenzatorja. Toplota je bila merjena po načelih kalorimetrijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo