Numerical investigation of V-groove air-collector performance with changing cover in Bangi, Malaysia
Autor: | Zahari Ibarahim, Kamaruzzaman Sopian, Ali H.A. Al-Waeli, Mohd. Yusof Othman, Idris Zulkifle, Mohd Hafidz Ruslan |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Fluid Flow and Transfer Processes
Thermal efficiency Convective heat transfer 020209 energy Airflow Mechanical engineering Fresnel lens 02 engineering and technology 021001 nanoscience & nanotechnology Solar irradiance law.invention Nanofluid law lcsh:TA1-2040 Thermal 0202 electrical engineering electronic engineering information engineering Mass flow rate Environmental science 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) Engineering (miscellaneous) |
Zdroj: | Case Studies in Thermal Engineering, Vol 12, Iss, Pp 587-599 (2018) |
Popis: | Air-based solar collectors are the simplest forms of flat plate solar collectors; without complications of introducing water or nanofluids into the process. They are used to raise the entering atmospheric air temperature to a level where it can be used for different low and medium temperature applications. The main components of their design are the collector, absorber and airflow arrangement. However, they exhibit the lowest efficiencies among other collectors. Hence, V-groove absorber designs are implemented to raise the thermal efficiency of air collectors. In this paper, a parametric study on the thermal performance of single-pass solar air collector with a v-groove absorber has been conducted using theoretical model and ran numerically using an excel sheet. The v-groove will enhance the convective heat transfer of the collector; as it has superior performance to flat-plate collectors. Two different cover designs are proposed; one with glass cover and the other with Fresnel lens cover. A comparison of different parameters is presented for various design conditions and operating conditions to drive the efficiency with respect to mass flowrate and incident solar radiation. This paper differs from other works in the literature in that it presents comparison between Fresnel lens and glass cover for V-groove single pass air heater. The results obtained shows that at solar irradiance of 755 W/m2 the collector covered with Fresnel less has the highest efficiency value of 71.18% compared to solar collectors with glass which has efficiency 54.10%. The mass flowrate contributed to efficiency enhancement. Moreover, a case study for Bangi, Malaysia was conducted to numerically test the performance of the two types using real-data from an outdoors test. Highest achieved temperatures from both collectors were around 35.85 °C for the glass-covered type and 38.39 °C for the Fresnel lens covered type. Keywords: Air-collector, Glass cover, Fresnel lens cover, V-groove, Convective heat transfer |
Databáze: | OpenAIRE |
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