Document Type : Research Article

Authors

1 Department of Mechanical Engineering, School of Engineering, Sirjan University of Technology, P. O. Box: 78137-33385, Sirjan, Kerman, Iran.

2 Department of Mechanical Engineering, School of Engineering, Higher Education Complex of Bam, P. O. Box: 76615-314, Bam, Kerman, Iran.

Abstract

Utilizing thermal storage units such as Phase Change Materials (PCMs) is a suitable approach to improving Solar Air Heaters (SAHs). The present study tries to assess the effects of PCM mass values on the heat dynamics and thermal performance of SAHs. To this aim, an analytical thermodynamic model was developed and validated by available experimental data. This model provides a robust numerical framework to model the phase change phenomenon and analyze the heat dynamics and thermal performance of SAH using various PCM masses. Four scenarios were considered using the developed analytical model including SAHs using 0, 30, 60, 90 kg PCM. The obtained results illustrated that the maximum outlet temperature was reduced, approximately near 20 %, by increasing the PCM mass between 0 and 90 kg; however, heating time was extended to periods when solar energy availability was inadequate. The thermal performance improved by nearly 14.5 % in the SAH using 90 kg PCM mass compared to the SAH without using PCM. The thermal performance of the SAH with 90 kg PCM was slightly higher than the SAH using 30 kg of PCM; hence, a significant portion of stored thermal energy was lost during nighttime through heat exchange with ambient surroundings. The obtained results also showed that despite available latent thermal energy, the outlet air temperature profiles for the SAHs using different PCM mass were close after sunset due to the low thermal conductivity of paraffin.
 

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1.     Bayati, N., Baghaee, H.R., Hajizadeh, A. and Soltani, M., "Localized protection of radial DC microgrids with high penetration of constant power loads", IEEE Systems Journal, (2020), 1-12. (https://doi.org/10.1109/JSYST.2020.2998059).
2.     Daghigh, R. and Shafieian, A., "Thermal performance of a double-pass solar air heater", Journal of Renewable Energy and Environment (JREE), Vol. 3, No. 2, (2016), 35-46. (https://doi.org/10.30501/jree.2016.70083).
3.     Kabeel, A. and Abdelgaied, M., "Solar energy assisted desiccant air conditioning system with PCM as a thermal storage medium", Renewable Energy, Vol. 122, (2018), 632-642. (https://doi.org/10.1016/j.renene.2018.02.020).
4.     Patel, J., Shukla, D., Raval, H. and Mudgal, A., "Experimental evaluation of the performance of latent heat storage unit integrated with solar air heater", International Journal of Ambient Energy, (2019), 1-9. (https://doi.org/10.1080/01430750.2019.1636862).
5.     SunilRaj, B. and Eswaramoorthy, M., "Experimental study on hybrid natural circulation type solar air heater with paraffin wax based thermal storage", Materials Today: Proceedings, Vol. 23, (2020), 49-52. (https://doi.org/10.1016/j.matpr.2019.06.381).
6.     Charvát, P., Klimeš, L. and Ostrý, M., "Numerical and experimental investigation of a PCM-based thermal storage unit for solar air systems", Energy Buildings, Vol. 68, (2014), 488-497. (https://doi.org/10.1016/j.enbuild.2013.10.011).
7.     Shalaby, S., Bek, M. and El-Sebaii, A., "Solar dryers with PCM as energy storage medium: A review", Renewable Sustainable Energy Reviews, Vol. 33, (2014), 110-116. (https://doi.org/10.1016/j.rser.2014.01.073).
8.     Bouadila, S., Lazaar, M., Skouri, S., Kooli, S. and Farhat, A., "Energy and exergy analysis of a new solar air heater with latent storage energy", International Journal of Hydrogen Energy, Vol. 39, (2014), 15266-15274. (https://doi.org/10.1016/j.ijhydene.2014.04.074).
9.     Salih, S.M., Jalil, J.M. and Najim, S.E., "Experimental and numerical analysis of double-pass solar air heater utilizing multiple capsules PCM", Renewable Energy, Vol. 143, (2019), 1053-1066. (https://doi.org/10.1016/j.renene.2019.05.050).
10.   Navarro, L., de Gracia, A., Castell, A. and Cabeza, L.F., "Experimental study of an active slab with PCM coupled to a solar air collector for heating purposes", Energy Buildings, Vol. 128, (2016), 12-21. (https://doi.org/10.1016/j.enbuild.2016.06.069).
11.   El Khadraoui, A., Bouadila, S., Kooli, S., Guizani, A. and Farhat, A., "Solar air heater with phase change material: An energy analysis and a comparative study", Applied Thermal Engineering, Vol. 107, (2016), 1057-1064. (https://doi.org/10.1016/j.applthermaleng.2016.07.004).
12.   Jain, D. and Tewari, P., "Performance of indirect through pass natural convective solar crop dryer with phase change thermal energy storage", Renewable Energy, Vol. 80, (2015), 244-250. (https://doi.org/10.1016/j.renene.2015.02.012).
13.   Ghiami, A., Kianifar, A., Aryana, K. and Edalatpour, M., "Energy and exergy analysis of a single‐pass sequenced array baffled solar air heater with packed bed latent storage unit for nocturnal use", Heat Transfer-Asian Research, Vol. 46, (2017), 546-568. (https://doi.org/10.1002/htj.21230).
14.   Ghiami, A. and Ghiami, S., "Comparative study based on energy and exergy analyses of a baffled solar air heater with latent storage collector", Applied Thermal Engineering, Vol. 133, (2018), 797-808. (https://doi.org/10.1016/j.applthermaleng.2017.11.111).
15.   Khan, Z., Khan, Z. and Ghafoor, A., "A review of performance enhancement of PCM based latent heat storage system within the context of materials, thermal stability and compatibility", Energy Conversion Management, Vol. 115, (2016), 132-158. (https://doi.org/10.1016/j.enconman.2016.02.045).
16.   Moradi, R., Kianifar, A. and Wongwises, S., "Optimization of a solar air heater with phase change materials: Experimental and numerical study", Experimental Thermal Fluid Science, Vol. 89, (2017), 41-49. (https://doi.org/10.1016/j.expthermflusci.2017.07.011).
17.   Arfaoui, N., Bouadila, S. and Guizani, A., "A highly efficient solution of off-sunshine solar air heating using two packed beds of latent storage energy", Solar Energy, Vol. 155, (2017), 1243-1253. (https://doi.org/10.1016/j.solener.2017.07.075).
18.   Abuşka, M., Şevik, S. and Kayapunar, A., "Experimental analysis of solar air collector with PCM-honeycomb combination under the natural convection", Solar Energy Materials Solar Cells, Vol. 195, (2019), 299-308. (https://doi.org/10.1016/j.solmat.2019.02.040).
19.   Abuşka, M., Şevik, S. and Kayapunar, A., "A comparative investigation of the effect of honeycomb core on the latent heat storage with PCM in solar air heater", Applied Thermal Engineering, Vol. 148, (2019), 684-693. (https://doi.org/10.1016/j.applthermaleng.2018.11.056).
20.   Raj, A., Srinivas, M. and Jayaraj, S., "A cost-effective method to improve the performance of solar air heaters using discrete macro-encapsulated PCM capsules for drying applications", Applied Thermal Engineering, Vol. 146, (2019), 910-920. (https://doi.org/10.1016/j.applthermaleng.2018.10.055).
21.   Jawad, Q.A., Mahdy, A.M., Khuder, A.H. and Chaichan, M.T., "Improve the performance of a solar air heater by adding aluminum chip, paraffin wax, and nano-SiC", Case Studies in Thermal Engineering, (2020), 100622. (https://doi.org/10.1016/j.csite.2020.100622).
22.   Sudhakar, P. and Cheralathan, M., "Encapsulated PCM based double pass solar air heater: A comparative experimental study", Chemical Engineering Communications, (2019), 1-13. (https://doi.org/10.1080/00986445.2019.1641701).
23.   Reddy, S.S., Soni, V. and Kumar, A., "Diurnal thermal performance characterization of a solar air heater at local and global scales integrated with thermal battery", Energy, Vol. 177, (2019), 144-157. (https://doi.org/10.1016/j.energy.2019.04.017).
24.   Charvát, P., Klimeš, L. and Ostrý, M., "Numerical and experimental investigation of a PCM-based thermal storage unit for solar air systems", Energy and Buildings, Vol. 68, (2014), 488-497. (https://doi.org/10.1016/j.enbuild.2013.10.011).
25.   Summers, E.K. and Antar, M.A., "Design and optimization of an air heating solar collector with integrated phase change material energy storage for use in humidification–dehumidification desalination", Solar Energy, Vol. 86, (2012), 3417-3429. (https://doi.org/10.1016/j.solener.2012.07.017).
26.   Leoni, N. and Amon, C., "Thermal design for transient operation of the TIA wearable computer", Proceedings of ASME InterPack, Vol. 2, (1997), 2151-2161.
27.   Kalogirou, S.A., Solar energy engineering: Processes and systems, Academic Press, (2013). (https://www.elsevier.com/books/solar-energy-engineering/kalogirou/978-0-12-397270-5)
28.   Duffie, J.A. and Beckman, W.A., Solar engineering of thermal processes, fourth edition, John Wiley & Sons, (2013). (https://www.sku.ac.ir/Datafiles/BookLibrary/45/John%20A.%20Duffie,%20William%20A.%20Beckman(auth.)-Solar%20Engineering%20of%20Thermal%20Processes,%20Fourth%20Edition%20(2013).pdf)
29.   Enibe, S., "Thermal analysis of a natural circulation solar air heater with phase change material energy storage", Renewable Energy, Vol. 28, (2003), 2269-2299. (https://doi.org/10.1016/S0960-1481(03)00071-5).
30.   O'Hegarty, R., Kinnane, O. and McCormack, S.J., "Concrete solar collectors for façade integration: An experimental and numerical investigation", Applied Energy, Vol. 206, (2017), 1040-1061. (https://doi.org/10.1016/j.apenergy.2017.08.239).