Minimization of the lifecycle cost of a rotary heat exchanger used in building ventilation systems in cold climates

Sokolnikas, Ignas (author), Čiuprinskas, Kęstutis (author), Čiuprinskiene, Jolanta (author)

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.

• Language: English
• Keywords: rotary heat exchangers, heat recovery, ventilation systems, temperature efficiency, pressure loss, ANSYS, lifecycle cost
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: Str. 302-310
• Numbering: Vol. 67, no. 6
• PID: 20.500.12556/RUL-128361
• UDC: 628.8
• ISSN on article: 0039-2480
• DOI: 10.5545/sv-jme.2021.7168
• COBISS.SI-ID: 69792259
• Publication date in RUL: 09.07.2021

Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Zveza strojnih inženirjev in tehnikov Slovenije [etc.], = Association of Mechanical Engineers and Technicians of Slovenia [etc.
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Secondary language

• Language: Slovenian
• Title: Minimizacija stroškov življenjskega cikla rotacijskih prenosnikov toplote za stavbne prezračevalne sisteme v hladnih podnebjih
• Keywords: rotacijski prenosniki toplote, rekuperacija toplote, prezračevalni sistemi, temperaturni izkoristek, tlačni padec, ANSYS, stroški življenjskega cikla