Thermal performance analysis of staging effect of solar thermal absorber with cross design = Analisis prestasi haba kepada kesan berperingkat penyerap haba suria dengan reka bentuk bersilang
The type and shape of solar thermal absorber materials will impact on the operating temperature and thermal energy storage effect of a solar air thermal collector. For a standard flat-plate design, energy gain can be increased by expanding the thermal absorber area along the collector plane, subject...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Kebangsaan Malaysia (UKM)
2015
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/50800/1/50800_Thermal_performance_analysis_of_staging_effect_of_solar_thermal_absorber_with_cross.pdf http://irep.iium.edu.my/50800/2/50800_Thermal_performance_analysis_of_staging_effect_of_solar_thermal_absorber_with_cross_SCOPUS.pdf http://irep.iium.edu.my/50800/ http://www.ukm.my/mjas/v19_n6/pdf/Amir_19_6_15.pdf |
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| Summary: | The type and shape of solar thermal absorber materials will impact on the operating temperature and thermal energy storage effect of a solar air thermal collector. For a standard flat-plate design, energy gain can be increased by expanding the thermal absorber area along the collector plane, subject to area limitation. This paper focuses on the staging effect of a metal hollow square rod absorber of aluminium, stainless steel, and a combination of the two with a cross design, for the heat gain and temperature characteristics of a solar air collector. Experiments were carried out with three cross design set-ups, with 30 minutes of heating and cooling, phase, respectively, under 485 W/m2 solar irradiance value, and at a constant air speed at 0.38 m/s. One-set aluminium set-up delivered the highest output temperature of 41.8 °C, followed by two-sets aluminium and one aluminium set + one stainless steel set at 39.3 °C and 38.2°C, respectively. The lowest peak temperature is recorded on three sets of the aluminium absorber at 35 °C. The bi-metallic set-up performed better than the two aluminium set-up where each set-up obtained a temperature drop against heat gain gradient value of -0.4186 °C/W and -0.4917 °C/W, respectively. Results concluded that by increasing the number of sets, the volume and surface areas of the absorber material are also increased, and lead to a decrease in peak temperature output for each increase of sets.
Jenis dan bentuk solar bahan penyerap haba akan memberi kesan kepada suhu operasi dan haba kesan penyimpanan tenaga udara
pengumpul haba suria. Untuk standard reka bentuk plat rata, penghasilan tenaga boleh ditingkatkan dengan memperluaskan
kawasan penyerap haba di sepanjang satah pengumpul tetapi tertakluk kepada had kawasan. Makalah ini memberi tumpuan
kepada kesan bertingkat logam berongga penyerap rod persegi aluminium, keluli tahan karat dan gabungan kedua-duanya
dengan reka bentuk silang kepada peningkatan haba dan ciri-ciri suhu pemanas udara suria. Eksperimen dilakukan dengan tiga
jenis reka bentuk silang dengan 30 minit pemanasan dan penyejukan fasa masing-masing pada 485 W/m2
nilai sinaran suria dan
pada kadar halaju udara berterusan 0.38 m/s. One-set aluminium set-up delivered the highest output temperature of 41.8 oC,
followed by two-sets aluminium and one aluminium set + one stainless steel set at 39.3 oC and 38.2 oC, respectively. The lowest
peak temperature is recorded on three sets of the aluminium absorber at 35 oC. Satu set aluminium mencapai suhu output
tertinggi pada 41.8 oC, diikuti dengan dua set aluminium dan satu set aluminium + satu keluli tahan karat dengan masing-masing
mencapai suhu 39.3 oC dan 38.2 oC. Suhu puncak terendah direkodkan pada tiga set penyerap aluminium pada 35 oC. Set dwilogam
menunjukkan prestasi yang lebih baik daripada dua set persediaan aluminium di mana setiap set mencapai penurunan
suhu terhadap nilai peningkatan haba dengan petunjuk aras kecerunan masing-masing pada -0.4186 oC/W dan -0.4917 oC/W. Melalui hasil kajian, kesimpulan dibuat bahawa dengan meningkatkan bilangan set, jumlah dan permukaan bidang bahan
penyerap juga meningkat dan menyebabkan pengurangan suhu output dan suhu puncak bagi setiap peningkatan set |
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