| Title |
Performance Analysis and Testing ofa Cross-Flow Aluminum Heat Exchanger for Kitchen Ventilation |
| Keywords |
Thermal performance analysis ; 전열해석 ; Aluminum heat exchanger ; 알루미늄 열교환기 ; Kitchen ventilation ; 주방환기 ; Air leakage ratio ; 누설률 ; Heat exchange efficiency ; 열교환 효율 |
| Abstract |
Thermal performance model was developed for a cross-flow aluminum heat exchanger with relatively short passage. Appropriate heat transfer coefficient and friction factor equations for laminar channel flow were obtained considering developing regions. The heat exchanger was analyzed using the unmixed cross-flow-NTU relationship considering leakage between streams. Thermal contact between corrugations and plates was also considered. Tests were separately conducted for two samples―one made of non-treated aluminum sheets, and the other made of varnish-treated ones. The samples were made by stacking corrugations and plates one after another. The model adequately predicted the thermal performance and pressure drop of the non-treated heat exchanger. The thermal performance of the varnish- treated one was 7∼12% overpredicted, and the pressure drop of the varnished-treated heat exchanger was 5∼15% underpredicted. The air leakage ratio of the non-treated heat exchanger was 23∼26%. The ratio decreased to less than 10% with the varnish treatment. |