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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
Předběžné výsledky měření na HVAC jednotce pro H2-Bus s chladivy R454C a R513A
 Blahut, Aleš ; Kordík, Jozef ; Šulc, V. ; Vinš, Václav
Technická zpráva shrnuje předběžné vyhodnocení experimentálních zkoušek chladící jednotky a tepelného čerpadla (HVAC) pro vodíkový autobus s chladivy R454C a R513A. V klimakomoře Elektrotechnického zkušebního ústavu, s. p. v Praze Troji byla v říjnu 2023 podrobně testována zkušební HVAC jednotka v režimech klimatizace a tepelného čerpadla při teplotách okolí od -25 °C do +45 °C. Ve zprávě jsou analyzovány základní výkonové parametry HVAC jednotky zahrnující topný a chladící výkon na kondenzátoru, resp. výparníku, topné a chladící faktory okruhu a izoentropickou účinnost kompresoru.
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Survey of electrobuses and hydrogen buses in the Czech republic and abroad (2000-2022)
 Gruber, Jan ; Bouška, Jindřich ; Brtna, D. ; Janovec, Jiří
The report summarizes parameters of electrobuses and hydrogen buses in the Czech republic, in the EU and to same extent also in other countries. In includes both historical, already finished projects and current or planned projects in the near future. The report describes and compares available parameters of these hydrogen buses, focusing on the mass-transit city buses. The report also includes preliminary results of simulations of hydrogen bus consumption. These were simulated in the model being developed in MATLAB/Simulink environment.
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Survey of the use of propane as refrigerant R290 in cooling circuits and heat pumps
 Aminian, Ali ; Prokopová, Olga ; Vinš, Václav
The technical report presents a review on the application of propane as refrigerant R290 in cooling circuits and heat pumps (HVAC). Safety risks of R290 used in HVAC are addressed according to ANSI/ASHRAE and EN standards. Comparison of thermophysical properties of propane with other refrigerants, solubility and miscibility of propane in compressor oils and heat transfer in condenser and evaporator are discussed. The main aim of the study is to provide an overview about the potential use of propane in the cooling circuit and heat pump for the hydrogen bus developed by the SOR Libchavy company.
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