Modification approach of Northern Wall to improve the performance of solar greenhouse dryers: A review

Abstract

Globally, interest is shifting toward green energy due to its environmental appeal. Therefore, to promote energy and environmental conservation in drying, several solar dryers have been developed which offers limitless, clean, and free energy to dry agricultural product. Among these solar dryers, solar greenhouse dryers offer a very simple low-temperature, energy-efficient structure capable of drying large beds of crops by harnessing thermal radiation energy from the sun. To improve the thermal performance in the passive mode especially, several modification approaches have been adopted. This article, therefore, reviewed various possible modification methods that have been adopted to improve the thermal performance of the greenhouse, with a focus on the modification of the northern wall. The various strategies involved in the modification of the north wall structure include creating an opaque north wall with black painted materials, installing a reflective north wall using a mirror, integrating heat storage materials like pebbles or brick, integrating phase change materials into the north wall, digging the soil depth to form a north wall and creating a variable southern roof with a modified north wall. Modifying the northern wall showed higher drying chamber temperature compared to completely transparent convectional greenhouse dryers in all the studies. These modifications can increase the temperature of the modified greenhouse by 13.38∼21.10% for a natural convection solar greenhouse dryer compared to the conventional type. With this approach, the radiation losses from the northern wall can be minimized and the energy management system of the greenhouse can be optimized for higher performance, making it more sustainable and eliminating the use of fossil fuel in agricultural product drying.

Keywords

Crop drying / Solar energy / Greenhouse dryer / Northern wall

CRediT authorship contribution statement

M.C. Ndukwu: Writing - review & editing, Writing - original draft, Visualization, Supervision, Software, Resources, Project administration, Methodology, Data curation, Conceptualization. Leonard Akuwueke: Resources, Visualization. Godwin Akpan: Writing - review & editing. M.F. Umunna: Resources, Visualization. Godwin Usoh: Resources, Visualization. Inemesit Ekop: Writing - review & editing. Promise Etim: Visualization. I. Okosa: Writing - review & editing. Francis Orji: Resources, Visualization. E.C. Ikechukwu-Edeh: Writing - review & editing. Ifiok Ekop: Writing - review & editing. Merlin Simo-Tagne: Visualization. Lyes Bennamoun: Writing - review & editing. Hongwei Wu: Visualization. Fidelis Abam: Writing - review & editing, Formal analysis, Data curation.

Declaration of competing interest

We the authors declare no conflict of interest whatsoever. The authors agreed to submit this article to GERS.

References

[1] Anuma, O., Ndukwu, M.C., Usoh, G., Sam, O., Akpan, G., Oriaku, L., Orji, F., Akuwueke, L., Ben, A.E., Bekkioui, N., simo-tagne, M., Abam, F., 2024. Energy and exergy analysis of a natural convection solar greenhouse drier with insulated opaque walls for drying aromatic yellow pepper. Renew. Energy 233 ( 2024), 121141.

[2] Ahmad, A., Prakash, O., 2019. Thermal analysis of north wall insulated greenhouse dryer at different bed conditions operating under natural convection mode. Environ. Prog. Sustain. Energy 2019, e13257.

[3] Al-Mahdouri, A., Baneshi, M., Gonome, H., Okajima, J., Maruyama, S., 2013. Evaluation of optical properties and thermal performances of different greenhouse covering materials. Sol. Energy 96, 21-32. https://doi.org/10.1016/j.solener.2013.06.029.

[4] Berroug, F., Lakhala, E.K., El Omari, M., Faraji, M., El Qarnia, H., 2011. Thermal performance of a greenhouse with a phase change material north wall. Energy Build. 43, 3027-3035, 2011.

[5] Boulard, T., Razafinjohany, E., Baille, A., Jaffrin, A., Fabre, B., 1990. Performance of a greenhouse heating system with a phase change material. Agric. For. Meteo- rol. 52 (3), 303-318, 1990.

[6] Cakır, U., Sahin, E., 2015. Using solar greenhouses in cold climates and evaluating optimum type according to sizing, position, and location: a case study. Comput. Electron. Agric. 117, 245-257. https://doi.org/10.1016/j.compag.2015.08.005.

[7] Cao, Y.F., Jing, H.W., Zhao, S.M., Zet, al., 2017. Optimization of back roof projection width and northern wall height in Chinese solar greenhouse. Trans. CSAE 33 (7), 183-189.

[8] Cao, K., Xu, H., Zhang, R., Xu, D., et al., 2019. Renewable and sustainable strategies for improving the thermal environment of Chinese solar greenhouses. Energy Build. 202, 109414. https://doi.org/10.1016/j.enbuild.2019.1094.

[9] Chauhan, P., Kumar, A., Nuntadusit, C., 2018. Thermo-environomical and drying kinetics of bitter gourd flakes drying under north wall insulated greenhouse dryer. Sol. Energy 205-216.

[10] Chauhan, P., Kumar, A., 2018. Thermal modelling and drying kinetics of gooseberry drying inside north wall insulated greenhouse dryer. Appl. Therm. Eng. 130, 587-59.

[11] Chauhan, P.S., Kumar, A., 2016. Performance analysis of greenhouse dryer by using insulated north wall under natural convection mode. Energy Rep. 2, 107-116.

[12] Chauhan, P.S., Kumar, A., 2017. Heat transfer analysis of north wall insulated greenhouse dryer under natural convection mode. Energy 118, 1264-1274.

[13] Chen, C., Ling, H., Zhai, Z., Li, Y., Yang, F., Han, F., et al., 2018. Thermal performance of an active-passive ventilation wall with phase change material in solar greenhouses. Appl. Energy 216, 602-612.

[14] Chen, D., 2001. Theory and practice of energy-saving solar greenhouse in China. Trans. Chin. Soc. Agric. Eng. 17, 22-26.

[15] Dragicevic, S., 2011. Determining the optimum orientation of a greenhouse on the basis of the total solar radiation availability. Therm. Sci. 15 (1), 215-221. https://doi.org/10.2298/TSCI100220057D.

[16] Dincer, I., Rosen, M.A., 2013. Exergy, Energy, Environment and Sustainable Development, second ed. Exergy Handbook, Elsevier, Oxford, UK.

[17] EL Afou, Y., Msaad, A.A., Kousksou, T., Mahdaoui, M., 2015. Predictive control of temperature under greenhouse using LQG strategy. In: Proceedings of 2015 IEEE International Renewable and Sustainable Energy Conference, IRSEC 2015. https://doi.org/10.1109/IRSEC.2015.7454975.

[18] EL khadraoui, A., Hamdi, I., Kooli, S., Guizani, A., 2019. Drying of red pepper slices in a solar greenhouse dryer and under open sun: experimental and mathematical investigations, 2018 Innovat. Food Sci. Emerg. Technol. 52, 262-270. https://doi.org/10.1016/j.ifset.2019.01.001.

[19] Fang, X., Li, Y., 2000. Numerical simulation and sensitivity of lattice passive solar heating wall. Sol. Energy 69, 55-66.

[20] Gupta, M.J., Chandra, P., 2002. Effect of greenhouse design parameters on conservation of energy for greenhouse environmental control. Energy 27 (8), 777-794. https://doi.org/10.1016/S0360-5442(02)00030-0.

[21] Gupta, R., Tiwari, G.N., 2005. Modeling of energy distribution inside greenhouse using the concept of solar fraction with and without reflecting surface on the north wall. Build. Environ. 40, 63-71.

[22] Han, F., Chen, C., Chen, H., Duan, S., et al., 2024. Research on creating the indoor thermal environment of the solar greenhouse based on the solar thermal storage and release characteristics of its north wall. Appl. Therm. Eng. 241, 122348.

[23] Hartz, T.K., Lewis, J.A., Hughe, H.A., 1981. Performance of modified brace institute greenhouse in Virginia. Horticulture Science 16, 74-78.

[24] Hassanain, A.A., Hokam, E.M., Mallick, T.K., 2011. Effect of solar storage wall on the passive solar heating constructions. Energy Build. 43, 737-747.

[25] Jain, D., 2005. Modeling the performance of greenhouse with packed bed thermal storage on crop drying application. J. Food Eng. 71, 170-178.

[26] Kumar, A., Tiwari, G.N., 2006. Thermal modelling of a natural convection greenhouse drying system for jaggery: an experimental validation. Sol. Energy 80, 1135-1144.

[27] Lamrani, L., Elmrabet, Y., Ibeh, M., et al., 2022. Energy, economic analysis and mathematical modelling of mixed-mode solar drying of potato slices with thermal storage loaded V-groove collector: application to Maghreb region. Renew. Energy 200 ( 2022), 48-58.

[28] Ling, H., Wang, L., Chen, C., Wang, Y., Chen, H., 2019. Effect of thermophysical properties correlation of phase change material on numerical modeling of agricultural building. Appl. Therm. Eng. 157, 113579. https://doi.org/10.1016/j.

[29] Liu, X., Yiming, Li, Anhua, L., Xiang, Y., Tianlai, L., 2019. Effect of North Wall materials on the thermal environment in Chinese solar greenhouse (Part A: experimental researches). Open Phys. 17, 752-767.

[30] Mani, P., Thirumalai Natesan, V., 2021. Experimental investigation of drying characteristics of lima beans with passive and active mode greenhouse solar dryers. J. Food Process. Eng. 44, 1-12. https://doi.org/10.1111/jfpe.13667,2021.

[31] Mobtaker, H.G., Ajabshirchi, Y., Ranjbar, S.F., Matloobi, M., 2019. Simulation of thermal performance of solar greenhouse in the north-west of Iran: an experimental validation. Renew. Energy 135, 88-97. https://doi.org/10.1016/j.renene.2018.10.003.

[32] Nayak, S., Tiwari, G.N., 2008. Energy and exergy analysis of photovoltaic/thermal integrated with a solar greenhouse. Energy Build. 40, 2015-2021.

[33] Ndukwu, M.C., Bennamoun, L., 2018. The potential of integrating Na₂SO₄·10H₂O pellets in the solar drying system. Dry. Technol. 36 (9), 1017-1030. https://doi.org/10.1080/07373937.2017.1366506.

[34] Ndukwu, M.C., Ibeh, M., Okon, B.B., Akpan, G., et al., 2023a. Progressive review of solar drying studies of agricultural products with exergoeconomics and econo-market participation aspect. Cleaner Environmental Systems 9, 100120.

[35] Ndukwu, M.C., Onyenwigwe, D.I., Abam, F.I., et al., 2022a. Influence of hot water blanching and saline immersion period on the thermal effusivity and the drying kinetics of hybrid solar drying of sweet potato chips. Sol. Energy 240, 176-192.

[36] Ndukwu, et al., 2023. A comparison of the drying kinetics, energy consumption, and colour quality of drying medicinal leaves in the direct-solar dryer with different colours of collector cover. Renew. Energy 216, 119076.

[37] Ndukwu, M.C., Bennamou, L., Abam, F.I., 2018. Experience of solar drying in Africa: presentation of designs, operations, and models. Food Eng. Rev. 10, 211-244.

[38] Ndukwu, M.C., Diemuodeke, E.O., Abam, F.I., et al., 2020a. Development and modelling of heat and mass transfer analysis of a low-cost solar dryer integrated with biomass heater: application for West African Region. Sci. Afr. 10, e00615.

[39] Ndukwu, M.C., Okon, B.B., Abam, F.I., et al., 2022b. Energy and exergy analysis of solar dryer with triple air passage direction collector powered by a wind generator. International Journal of Energy and Environmental Engineering.

[40] Ndukwu, M.C., Akpan, G., Okeahialam, A.N., et al., 2023c. A comparison of the drying kinetics, energy consumption, and colour quality of drying medicinal leaves in the direct-solar dryer with different colours of collector cover. Renew. Energy 216, 119076.

[41] Ndukwu, M.C., Ben, A.E., Lamrani, B., Hongwei, W., et al., 2022c. Comparative experimental evaluation and thermodynamic analysis of the possibility of using degraded C15-C50 crankcase oil waste as thermal storage materials in solar drying systems. Sol. Energy 240, 408-421. https://doi.org/10.1016/j.solener.2022.05.056.

[42] Ndukwu, M.C., Bennamoun, L., Abam, F.I., et al., 2017. Energy and exergy analysis of a solar dryer integrated with sodium sulphate decahydrate and sodium chloride as a thermal storage medium. Renew. Energy 113, 1182-1192.

[43] Ndukwu, M.C., Onyenwigwe, D., Abam, F.I., et al., 2020b. Development of a low-cost wind-powered active solar dryer integrated with glycerol as thermal storage. Renew. Energy. https://doi.org/10.1016/j.renene.2020.03.016.

[44] Ndukwu, M.C., Ibeh, M., Ekop, I., Abada, et al., 2022d. Analysis of the heat transfer coefficient, thermal effusivity, and mathematical modelling of drying kinetics of a partitioned single pass low-cost solar drying of cocoyam chips with economic assessments. Energies 15, 4457. https://doi.org/10.3390/en15124457, 2022.

[45] Nimnuan, P., Nabnean, S., 2020. Experimental and simulated investigations of the performance of the solar greenhouse dryer for drying cassumunar ginger (Zingiber cassumunar roxb.). Case Stud. Therm. Eng. 22, 100745. https://doi.org/10.1016/j.csite.2020.100745.

[46] Onyenwigwe, D., Ndukwu, M.C., et al., 2023. Eco-thermal analysis and response surface optimization of the drying rate of potato slices in a mix-mode solar dryer. Iranian Journal of Science and Technology, Transactions of Mechanical Engineering. https://doi.org/10.1007/s40997-023-00595-4.

[47] Onyenwigwe, D.I., Ndukwu, M.C., Igbojionu, D.O., et al., 2023. Mathematical modelling of drying kinetics, economic and environmental analysis of natural convection mixmode solar and sun drying of pre-treated potato slices. Int. J. Ambient Energy. https://doi.org/10.1080/01430750.2023.2182359.

[48] Öztürk, H.H., Ba, A., Cetinçelik, S., 2003. Energy and exergy efficiency of a packed-bed heat storage unit for greenhouse heating. Biosyst. Eng. 86, 231-245.

[49] Panwar, N.L., Kaushik, S.C., Kothari, S., 2013. Thermal modelling and experimental validation of solar tunnel dryer: a clean energy option for drying surgical cotton. Int. J. Low Carbon Technol. 11, 16-28, 2013.

[50] Prakash, O., Kumar, A., 2014. Performance evaluation of greenhouse dryer with opaque north wall. Heat Mass Tran. 50, 493-500. https://doi.org/10.1007/s00231-013-1256-2.

[51] Purusothaman, M., Valarmathi, T.N., 2021. Comparative study of modified greenhouse solar dryer with north wall materials. Mater. Today: Proc. 44, 3786-3791.

[52] Rathore, N.S., Panwar, N.L., 2010. Experimental studies on hemi cylindrical walk-in type solar tunnel dryer for grape drying. Appl. Energy 87, 2764-2767.

[53] Ramde, E.W., Forson, F.K., 2007. Computer-aided sizing of direct mode natural convection solar crop dryers. J. Eng. Technol. 1, 1-9.

[54] Santamouris, M., Argiriou, A., Vallindras, M., 1994. Design and operation of a low energy consumption passive solar agricultural greenhouse. Sol. Energy 52, 371-378.

[55] Santamouris, M., Balaras, C.A., Dascalaki, E., Vallindras, M., 1993. Passive solar agricultural greenhouses: a worldwide classification and evaluation of technologies and systems used for heating purposes. Sol. Energy 53, 411-426.

[56] Selimefendigil, F., Ceylin, Ş., Hakan, F.O., 2022. Improving the performance of an active greenhouse dryer by integrating a solar absorber north wall coated with graphene nanoplatelet-embedded black paint. Sol. Energy 231, 140-148.

[57] Sethi, V.P., Arora, S., 2009. Improvement in greenhouse solar drying using inclined north wall refection. Sol. Energy 83, 1472-1484.

[58] Sethi, V.P., Dubey, R.K., 2011. Development of dual-purpose greenhouse coupled with north wall utilization for higher economic gains. Sol. Energy 85, 734-745.

[59] Sevda, M.S., Rathore, N.S., 2010. Performance evaluation of the semicylindrical solar tunnel dryer for drying handmade paper. J. Renew. Sustain. Energy 2, 1-18.

[60] Singh, P., Gaur, M.K., 2021. Environmental and economic analysis of novel hybrid active greenhouse solar dryer with evacuated tube solar collector. Sustain. Energy Technol. Assessments 47, 101428. https://doi.org/10.1016/j.seta.2021.101428.

[61] Singh, R.D., Tiwari, G.N., 2000. Thermal heating of controlled environment greenhouse: a transient analysis. Energy Convers. Manag. 41, 505-522.

[62] Singh, P., Shrivastava, V., Kumar, A., 2018. Recent developments in greenhouse solar drying: a review. Renew. Sustain. Energy Rev. 82, 3250-3262. https://doi.org/10.1016/j.rser.2017.10.020.

[63] Singh, S., Kumar, S., 2012. Development of convective heat transfer correlations for common designs of solar dryers. Energy Convers. Manag. 64, 403-414.

[64] Srinivasan, G., Muthukumar, P., 2021. A review on solar greenhouse dryer: design, thermal modelling, energy, economic and environmental aspects. Sol. Energy 229, 3-21.

[65] Tiwari, G.N., Amita, G, RaviG., 2002. Evaluation of solar fraction on north partition wall for various shapes of solarium by Auto-CAD. Energy Build. 1506, 1-8.

[66] Tiwari, G.N., 2009. Fundamental of Solar Dryers. Anamaya Publishers, New Delhi, India, pp. 263-264.

[67] Vivekanandan, M., Periasamy, K., Dinesh Babu, C., et al., 2021. Experimental and CFD investigation of six shapes of solar greenhouse dryer in no load conditions to identify the ideal shape of the dryer. Mater. Today Proc. 37, 1409-1416. https://doi.org/10.1016/j.matpr.2020.07.062.

[68] Yu, Y., Xu, X., Hao, W., 2018. Study on the wall optimization of solar greenhouse based on temperature field experiment and CFD simulation. Int. J. Heat Technol. 36, 847-854.

[69] Zhang, J., Zou, Z.R., Zhang, Y., Sun, Y.C., 2016. Performance of heating storage gravel wall solar greenhouse. North. Hortic. 2, 46-50.

[70] Zhang, X., Lv, J., Dawuda, M., Xie, J., Yu, J., Gan, Y., et al., 2019. Innovative passive heatstorage walls improve thermal performance and energy efficiency in Chinese solar greenhouses for non-arable lands. Sol. Energy 190, 561-575.

[71] Zhang, Y., Zou, Z.R., Li, J.M., 2014. Performance experiment on lighting and thermal storage in tilting roof solar-greenhouse. Trans. CSAE 30, 129-137.

[72] Zhu, J., Xuelai, Z., Weisan, H., Jun, J., Xin, L., 2023. Current status and development of research on phase change materials in agricultural greenhouses: a review. J. Energy Storage 66, 107104.