Šiame straipsnyje analizuojami rotaciniai šilumokaičiai naudojami vėdinimo sistemose šilumai atgauti. Trumpai aptariami skirtingi šilumokaičių tipai, jų charakteristikos. Straipsnyje aprašomi atlikti rotacinių šilumokaičių bandymai KomfoLab laboratorijoje, pateikiama metodika apskaičiuoti rotacinių šilumokaičių temperatūrinį efektyvumą ir slėgio nuostolius. Rezultatai gauti modeliuojat šilumokaičius su baigtinių tūrių programa ANSYS lyginami su rezultatais gautais laboratorinių tyrimų metu. Toliau šilumokaičiai su skirtingais parametrais analizuojami su programa ANSYS pagal užsibrėžtas ribas. Gauti rezultatai lyginami pritaikant gyvavimo ciklo analizę. Išanalizavus šilumokaičius su mažiausiais gyvavimo ciklo kaštais yra pateikiami optimalūs rotacinių šilumokaičių parametrai.
This article presents an analysis of rotary heat exchangers (RHE) used as heat recovery units in building ventilation systems in cold climates. Usually, heat exchangers with the highest heat transfer efficiency are the preferable option for this purpose. However, such exchangers usually have the highest media pressure drop, thus requiring the highest amount of energy for media transportation. In this study, the problem is solved by analysing the lifecycle cost (LCC) of the RHE including both the recovered heat and the electricity consumed in the fans of the air handling unit (AHU). The purpose of the investigation was to determine the optimal set of geometrical characteristics such as the exchanger’s length, foil thickness, the height and width of the air channel. Two hundred and seventy different combinations were examined using analytical dependencies and ANSYS simulations. The results are compared with experimental data obtained earlier at the KOMFOVENT laboratory. The results show that the best overall energy efficiency is obtained in heat exchangers that do not offer the best heat recovery efficiency, and LCC differences in the same climatic and economic conditions can go as high as 31 %, mainly due to the geometrical parameters of the heat exchanger.
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