jeae journal
PERFORMANCE EVALUATION OF EXPERIMENTAL SOLAR EVAPORATIVE COOLING SYSTEMS
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Keywords

Evaporative Cooler
Desiccant
Temperature drop
Relative Humidity
Cooling Efficiency

Abstract

Evaporative cooling systems have many advantages over refrigeration systems, such as not necessarily requiring connection to the national grid, not using refrigerants that emit ozone-depleting substances into the environment, and can be constructed from locally available materials. However, little information on incorporating desiccant as an air preconditioning component to increase the performance of these coolers is available. In this regard, this study aimed to examine the efficacy of three cooling systems: an evaporative cooler with a silica gel desiccant component (desiccant cooler), an evaporative cooler without desiccant (desiccant-free cooler), and an evaporative charcoal cooler (charcoal cooler). Dry and wet bulb temperatures and relative humidity were recorded during the experiment and used to determine the cooling efficiencies of the systems; temperature drops; and humidity increases, which are used as performance indicators. Results demonstrate a significant (P<0.05) impact of the coolers on all analysed parameters. The desiccant cooler achieved the highest cooling efficiency at 87.2%, followed by the charcoal cooler at 79.3%, and the desiccant-free cooler at 67.2%. Temperature reduction was most pronounced in the desiccant cooler (3.7°C), followed by the charcoal cooler (3.2°C) and the desiccant-free cooler (2.8°C). Relative humidity levels increased by 30.7%, 23%, and 26.1% in the desiccant, desiccant-free, and charcoal coolers, respectively. Importantly, the evaporative cooler with desiccant operated without ozone-depleting refrigerants and utilized solar energy, offering an environmentally friendly solution. Its capacity to provide appropriate storage conditions for a wide range of fruits and vegetables makes it particularly beneficial for farmers lacking access to adequate cooling storage facilities, enabling them to preserve their produce effectively.

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References

Adekanye, T., Babaremu, K., & Okunola, A. (2019). Evaluation of an active evaporative cooling device for storage of fruits and vegetables. Agricultural Engineering International: CIGR Journal, 21(1), 203–208.

Chandak, P., Patki, S., & Kulkarni, D. (2019). A Review on performance parameters and its evaluation of evaporative air cooler. Journal of Emerging Technologies and Innovative Research (JETIR), 6(4), 733. www.jetir.org

Chandegara, V. K., Vamja, S. B., Sureja, S. C., & Vaghela, K. R. (2016). Development of low cost plastic evaporative cooling storage structure. AMA, Agricultural Mechanization in Asia, Africa and Latin America, 47(3), 14–22.

Chen, L., & Shi, Q. (2022). Experimental study and performance analysis on a closed-cycle rotary dehumidification air conditioning system in deep underground spaces. Case Studies in Thermal Engineering, 37(June), 102245. https://doi.org/10.1016/j.csite.2022.102245

Chinenye, N. M., Manuwa, S. I., Olukunle, O. J., & Oluwalana, I. B. (2013). Development of an active evaporative cooling system for short-term storage of fruits and vegetable in a tropical climate. Agricultural Engineering International: CIGR Journal, 15(4), 307–313.

Cui, X., Xiaohu, Y., Yanjun, S., Meng, X., & Liwen Jin. (2018). Energy Efficient Indirect Evaporative Cooling. In Advanced Cooling Technologies and Applications (pp. 10–25). https://doi.org/10.5772/intechopen.79223

Dhakulkar, K. T., Hinge, M. V., Kolhe, M. S., Chaudhari, M. R., & Mahalle, M. S. (2018). An experimental analysis of direct evaporative cooler by cooling pads. International Research Journal of Engeneering and Technology (IRJET), 5(5), 292–299.

Gustavo, A., William, F., Jozimo, S. R., Jorge, O., Jennifer, S., & Sarah, J. (2023). Reducing food loss and waste in the Near East and North Africa - Producers intermediaries and consumers as key decision makers. FAO. https://doi.org/10.4060/cc3409en

Ishaq, M., Mahmood H., M., Sultan, M., Ashraf N., M., & Miyazaki, T. (2022). Energy -Efficient System for Agricultural Applications. In S. Muhammad & T. Miyazaki (Eds.), Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-86394-4_4

Kapilan, N., Isloor, A. M., & Karinka, S. (2023). A comprehensive review on evaporative cooling systems. Results in Engineering, 18(January), 101059. https://doi.org/10.1016/j.rineng.2023.101059

Ndukwu, M. C., Manuwa, S. I., Olukunle, O. J., & Oluwalana, I. B. (2013). Mathematical Model for Direct Evaporative Space Cooling Systems. Nigerian Journal of Technology, 32(3), 403–409.

Nkolisa, N., Samukelo, L., Seyoum, T., & Chimpango, A. (2018). Evaluating evaporative cooling system as an energy- free and cost- effective method for postharvest storage of tomatoes ( Solanum lycopersicum L .) for smallholder farmers. Scientia Horticulturae, 241(2018), 131–143. https://doi.org/10.1016/j.scienta.2018.06.079

Ochida, C. O., Itodo, A. U., & Nwanganga, P. A. (2018). A Review on Postharvest Storage, Processing and Preservation of Tomatoes (Lycopersicon esculentum Mill). Asian Food Science Journal, 6(2), 1–10. https://doi.org/10.9734/afsj/2019/44518

Ronoh, E. K., Kanali, C. L., & Ndirangu, S. N. (2020). Effectiveness of an evaporative charcoal cooler for the postharvest preservation of tomatoes and kales. Research in Agricultural Engineering, 66(2), 66–71. https://doi.org/10.17221/52/2019-RAE

Ronoh, E. K., Kanali, C. L., Ndirangu, S. N., Mang’oka, S. M., & John, A. W. (2018). Performance evaluation of an evaporative charcoal cooler and its effects on quality of leafy vegetables. Journal of Postharvest Technology, 06(3), 60–69. http://www.jpht.info

Sahlot, M., & Riffat, S. B. (2016). Desiccant cooling systems: A review. International Journal of Low-Carbon Technologies, 11(4), 489–505. https://doi.org/10.1093/ijlct/ctv032

Seweh, E. A., Darko, J. O., Addo, A., Asagadunga, P. A., & Achibase, S. (2016). Design, construction and evaluation of an evaporative cooler for sweet potatoes storage. Agricultural Engineering International: CIGR Journal, 18(2), 435–448.

Sibanda, S., & Workneh, T. S. (2020). Potential causes of postharvest losses , low-cost cooling technology for fresh produce farmers in Sub- Sahara Africa. African Journal of Agricultural Research Review, 16(5), 553–566. https://doi.org/10.5897/AJAR2020.14714

van Oorschot, R. (2017). Desiccant Evaporative Cooling. International Journal of Scientific Development and Research, 2(4), 232–235.

Yang, Y., Cui, G., & Lan, C. Q. (2019). Developments in evaporative cooling and enhanced evaporative cooling - A review. Renewable and Sustainable Energy Reviews, 113, 109230. https://doi.org/10.1016/j.rser.2019.06.037

Zakari, M. D., Abubakar, Y. S., Muhammad, Y. B., Shanono, N. J., Nasidi, N. M., Abubakar, M. S., Muhammad, A. I., Lawan, I., & Ahmad, R. K. (2016). Design and construction of an evaporative cooling system for the storage of fresh tomato. ARPN Journal of Engineering and Applied Sciences, 11(4), 2340–2348.

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