DOI: https://doi.org/10.15587/1729-4061.2018.142719

Results of research into thermal-technical characteristics of solar collector

Vitaliy Boyarchuk, Sergiy Korobka, Mykhailo Babych, Roman Krygul

Abstract


We developed a new design of an air solar collector made in the form of an inseparable power unit, which includes a frame with heat-insulated walls, single glazing and a selective surface on its bottom. We defined a number of generalizing dependences for the determination of thermal efficiency of an air solar collector, namely, an influence of the mass air flow qa on a temperature difference of the heat-transfer agent to and insulation E, on heat productivity q and the efficiency η of the solar collector.

Based on the experimental data, we obtained linear regression dependencies of the average daily ambient temperature teat on energy illumination E and the average temperature of the heat-transfer agent carrier taat of the average daily ambient temperature teat. We verified the adequacy of the results of theoretical and experimental studies.

We established that we achieve the maximum values of the efficiency of the solar collector η ‒ from 65 to 80.6 % at a temperature of the outlet flow of the heat-transfer agent to from 30 to 60 °C and mass air flow, qa from 170 to 190 m3/h.

We determined that an increase in the level of insulation E from 100 to 1,000 W/m2 makes it possible to increase heating productivity of the collector q from 320 to 1,260 W and the temperature of the heat-transfer agent at the collector outlet to from 10 to 60 °C.

We can use the obtained results in development and improvement of technical means for drying fruits, for improvement of technological and energy efficiency of the process.


Keywords


air solar collector; transparent coating; absorber; solar energy; temperature; heat exchange; heat loss

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References


Ho, C., Chang, H., Wang, R., Lin, C. (2013). Analytical and Experimental Study of Recycling Baffled Double-Pass Solar Air Heaters with Attached Fins. Energies, 6 (4), 1821–1842. doi: https://doi.org/10.3390/en6041821

Vishwakarma, A., Jaurker, A. R. (2014). Experimental Investigation for Enhancement of Heat Transfer in Double Pass Solar Air Heater Using Transverse Discrete Rib Geometry. International Journal of Emerging Trends in Engineering and Development, 4 (4), 366–377.

Chabane, F., Moummi, N., Benramache, S., Bensahal, D., Belahssen, O. (2013). Collector Efficiency by Single Pass of Solar Air Heaters with and without Using Fins. Engineering Journal, 17 (3), 43–55. doi: https://doi.org/10.4186/ej.2013.17.3.43

Amankwah, E. A. Y., Dzisi, K. A., van Straten, G., van Willigenburg, L. G., van Boxtel, A. J. B. (2017). Distributed mathematical model supporting design and construction of solar collectors for drying. Drying Technology, 35 (14), 1675–1687. doi: https://doi.org/10.1080/07373937.2016.1269806

Sharma, S. P., Saha, S. N. (2017). Thermohydraulic Performance of Double Flow Solar Air Heater with Corrugated Absorber. International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering, 11 (7), 855–861.

NASA Surface meteorology and Solar Energy. Available at: https://eosweb.larc.nasa.gov/

Yeh, H.-M. (2014). Effect of Pass Number on Collector Efficiency in Downward-Type Multipass Solar Air Heaters. Journal of Applied Science and Engineering, 17 (2), 175–184. doi: https://doi.org/10.6180/jase.2014.17.2.08

Karim, M. A., Amin, Z. M. (2015). Mathematical modelling and performance analysis of different solar air collectors. IIUM Engineering Journal, 16 (2), 43–55.

Solar energy – Solar thermal collectors – Test methods. International Standard. ISO/FDIS 9806:2013(E).

ASHRAE Standard 93-1986 (RA 91) Metods of Testing to Determine The Thermal Performance of Solar Collektors (2002). American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc. Atlanta, USA.

Korobka, S., Babych, M., Krygul, R., Zdobytskyj, A. (2018). Substantiation of parameters and operational modes of air solar collector. Eastern-European Journal of Enterprise Technologies, 3 (8 (93)), 16–28. doi: https://doi.org/10.15587/1729-4061.2018.132090

Syvoraksha, V. Yu., Markov, V. L., Petrov, B. Ye., Zolotko, K. Ye., Statsenko, I. M. (2003). Teplovi rozrakhunky heliosystem. Dnipropetrovsk: Vyd-vo DNU, 132.

Duffie, J. А., Beckmаn, W. А. (2013). Solar engineering of thermal processes. John Wiley & Sons, 936.


GOST Style Citations


Analytical and Experimental Study of Recycling Baffled Double-Pass Solar Air Heaters with Attached Fins / Ho C., Chang H., Wang R., Lin C. // Energies. 2013. Vol. 6, Issue 4. P. 1821–1842. doi: https://doi.org/10.3390/en6041821 

Vishwakarma A., Jaurker A. R. Experimental Investigation for Enhancement of Heat Transfer in Double Pass Solar Air Heater Using Transverse Discrete Rib Geometry // International Journal of Emerging Trends in Engineering and Development. 2014. Vol. 4, Issue 4. P. 366–377.

Collector Efficiency by Single Pass of Solar Air Heaters with and without Using Fins / Chabane F., Moummi N., Benramache S., Bensahal D., Belahssen O. // Engineering Journal. 2013. Vol. 17, Issue 3. P. 43–55. doi: https://doi.org/10.4186/ej.2013.17.3.43 

Distributed mathematical model supporting design and construction of solar collectors for drying / Amankwah E. A. Y., Dzisi K. A., van Straten G., van Willigenburg L. G., van Boxtel A. J. B. // Drying Technology. 2017. Vol. 35, Issue 14. P. 1675–1687. doi: https://doi.org/10.1080/07373937.2016.1269806 

Sharma S. P., Saha S. N. Thermohydraulic Performance of Double Flow Solar Air Heater with Corrugated Absorber // International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering. 2017. Vol. 11, Issue 7. P. 855–861.

NASA Surface meteorology and Solar Energy. URL: https://eosweb.larc.nasa.gov/

Yeh H.-M. Effect of Pass Number on Collector Efficiency in Downward-Type Multipass Solar Air Heaters // Journal of Applied Science and Engineering. 2014. Vol. 17, Issue 2. P. 175–184. doi: https://doi.org/10.6180/jase.2014.17.2.08

Karim M. A., Amin Z. M. Mathematical modelling and performance analysis of different solar air collectors // IIUM Engineering Journal. 2015. Vol. 16, Issue 2. P. 43–55.

Solar energy – Solar thermal collectors – Test methods. International Standard. ISO/FDIS 9806:2013(E).

ASHRAE Standard 93-1986 (RA 91) Metods of Testing to Determine The Thermal Performance of Solar Collektors. American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc. Atlanta, USA, 2002.

Substantiation of parameters and operational modes of air solar collector / Korobka S., Babych M., Krygul R., Zdobytskyj A. // Eastern-European Journal of Enterprise Technologies. 2018. Vol. 3, Issue 8 (93). P. 16–28. doi: https://doi.org/10.15587/1729-4061.2018.132090

Teplovi rozrakhunky heliosystem / Syvoraksha V. Yu., Markov V. L., Petrov B. Ye., Zolotko K. Ye., Statsenko I. M. Dnipropetrovsk: Vyd-vo DNU, 2003. 132 p.

Duffie J. А., Beckmаn W. А. Solar engineering of thermal processes. 4-th ed. John Wiley & Sons, 2013. 936 p.







Copyright (c) 2018 Vitaliy Boyarchuk, Sergiy Korobka, Mykhailo Babych, Roman Krygul

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061