Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios
The baffle in the air collector duct increases heat transfer, while also significantly increasing the pressure loss penalty. Pressure loss reduction can be achieved using the unequal baffle pitch which is proposed in this study. In the current paper, a numerical investigation of an air collector duc...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-12-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21006493 |
| _version_ | 1818352874853236736 |
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| author | Nguyen Minh Phu Pham Ba Thao Nguyen Van Hap |
| author_facet | Nguyen Minh Phu Pham Ba Thao Nguyen Van Hap |
| author_sort | Nguyen Minh Phu |
| collection | DOAJ |
| description | The baffle in the air collector duct increases heat transfer, while also significantly increasing the pressure loss penalty. Pressure loss reduction can be achieved using the unequal baffle pitch which is proposed in this study. In the current paper, a numerical investigation of an air collector duct with inclined baffles is presented. Inclined baffles spaced with successive ratio (r) from 1 to 1.4 and Reynolds number (Re) of air from 2370 to 13250 were varied to evaluate Nusselt number, friction factor and effective efficiency of the collector. 2D numerical simulations with the standard k-ε turbulence model were performed to clarify the flow mechanism through baffles. The results show that pressure loss in case of r > 1 significantly reduces compared to that of r = 1. Therefore, the maximum effective efficiency of the baffled collector duct with successive ratios from 1 to 1.3 is the same and equals to 0.6. It is better to install dense baffles near the inlet than dense baffles near the outlet because many baffles concentrated on the inlet create high turbulence in the rest of the air collector duct. |
| first_indexed | 2024-12-13T19:00:34Z |
| format | Article |
| id | doaj.art-0526d24e2d7d45f5a027a7dac0dfb792 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-13T19:00:34Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-0526d24e2d7d45f5a027a7dac0dfb7922022-12-21T23:34:41ZengElsevierCase Studies in Thermal Engineering2214-157X2021-12-0128101486Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratiosNguyen Minh Phu0Pham Ba Thao1Nguyen Van Hap2Faculty of Heat and Refrigeration Engineering, Industrial University of Ho Chi Minh City (IUH), 12 Nguyen Van Bao, Go Vap district, Ho Chi Minh City, 700000, Viet Nam; Corresponding author.Faculty of Heat and Refrigeration Engineering, Industrial University of Ho Chi Minh City (IUH), 12 Nguyen Van Bao, Go Vap district, Ho Chi Minh City, 700000, Viet NamFaculty of Mechanical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, 700000, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet NamThe baffle in the air collector duct increases heat transfer, while also significantly increasing the pressure loss penalty. Pressure loss reduction can be achieved using the unequal baffle pitch which is proposed in this study. In the current paper, a numerical investigation of an air collector duct with inclined baffles is presented. Inclined baffles spaced with successive ratio (r) from 1 to 1.4 and Reynolds number (Re) of air from 2370 to 13250 were varied to evaluate Nusselt number, friction factor and effective efficiency of the collector. 2D numerical simulations with the standard k-ε turbulence model were performed to clarify the flow mechanism through baffles. The results show that pressure loss in case of r > 1 significantly reduces compared to that of r = 1. Therefore, the maximum effective efficiency of the baffled collector duct with successive ratios from 1 to 1.3 is the same and equals to 0.6. It is better to install dense baffles near the inlet than dense baffles near the outlet because many baffles concentrated on the inlet create high turbulence in the rest of the air collector duct.http://www.sciencedirect.com/science/article/pii/S2214157X21006493Inclined baffleSolar air heaterUnequal pitchEffective efficiency |
| spellingShingle | Nguyen Minh Phu Pham Ba Thao Nguyen Van Hap Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios Case Studies in Thermal Engineering Inclined baffle Solar air heater Unequal pitch Effective efficiency |
| title | Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios |
| title_full | Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios |
| title_fullStr | Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios |
| title_full_unstemmed | Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios |
| title_short | Effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios |
| title_sort | effective efficiency assessment of a solar air heater having baffles spaced with different successive ratios |
| topic | Inclined baffle Solar air heater Unequal pitch Effective efficiency |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21006493 |
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