INFLUENCE OF COMBINED DRYING OF COLLOID CAPILLARY-POROUS MATERIALS ON ENERGY EXPENDITURES
Abstract
One of the berry crops that has recently gained popularity among consumers is blueberry (Vaccinium corymbosum L.). The berry is a powerful antioxidant, and besides, it contains fructose in its composition, which automatically refers it to the products of the diabetic diet. Therefore, blueberries become an interesting colloidal capillary-porous drying object. Wax on the skin of berries performs a protective function in the process of ripening, harvesting and transportation, but is a negative factor for the implementation of technological processing by artificial dehydration. The latter causes significant energy costs for the processing process. Therefore, the aim of the work is to determine the effect of combined drying of blueberry on energy consumption.
Experimental studies of the drying kinetics of blueberry were carried out on an experimental convective stand with forced recirculation of the coolant and infrared emitters, which was developed in ІEТ of NAS of Ukraine. The effect of pre-developed hygrothermal and infrared treatment of fresh blueberries on the kinetics and change in the drying speed of berries was investigated. The use of infrared radiation made it possible to reduce the total duration of the dehydration process by 1.2 times.
The heat of evaporation of moisture from the samples and their heat capacity were investigated using the method created in ІEТ of NAS of Ukraine installations of synchronous thermal analysis DMKI-01, which is intended for the study of colloidal capillary-porous materials. Determination of specific heat capacity was carried out according to the standardized method of step-by-step scanning DSTU ISO 11357–4:2010 in the temperature range from 30 to 95℃.
Experimental determination of heat capacity and heat of evaporation of moisture from pre-processed blueberry showed excess energy consumption for a possible phase transition of the waxy shell of the berry during drying and a decrease in the drying efficiency of the material at moisture values Wc ≤ 20%.
References
2. Haivas B. Matematychne modeliuvannia konvektyvnoho sushinnia materialiv z urakhuvanniam mekhanotermodyfuziinykh protsesiv [Mathematical modeling of convective drying of materials taking into account mechano-thermo diffusion processes]. Fizyko-matematychne modeliuvannia ta informatsiini tekhnolohii. – 2010. – Vyp. 12. – S. 9–37. (in Ukr.)
3. Balan A. (2019). Suchasni znannia — draiver rozvytku yahidnoho sektoru Ukrainy [Modern knowledge is a driver of the development of the berry sector of Ukraine]. Yahidnyk, 4, 10. (in Ukr.)
4. Halat, L. M. (2021). Eksportnyi potentsial ta problemy rozvytku haluzi yahidnytstva Ukrainy [Export potential and problems of development of the berry growing industry of Ukraine]. Ahrosvit, 1-2, 46-55. (in Ukr.)
5. Akulich A.V., Hostinshchykova L.A. Yssledovanye kynetyky protsessa sushky yahodnoho sуria pry razlychnуkh sposobakh еnerhopodvoda [Study of the kinetics of the drying process of berry raw materials with various methods of energy supply]. Kharchova nauka i tekhnolohiia, 2 (23), 2013. S. 112-115. (in Rus.)
6. Tamás, A. (2021). Effect of different drying techniques on the drying time and energy of blueberry. Analecta Technica Szegedinensia, 15(1), 23-30.
7. Castagnini, J. M., Betoret, N., Betoret, E., & Fito, P. (2015). Vacuum impregnation and air drying temperature effect on individual anthocyanins and antiradical capacity of blueberry juice included into an apple matrix. LWT - Food Science and Technology, 64, 1289-1296.
8. Wu, X., Zhang, M., & Bhandari, B. (2019). A Novel Infrared Freeze Drying (IRFD) Technology to Lower the Energy Consumption and Keep the Quality of Cordyceps Militaris. Innovative Food Science and Emerging Technologies, 54, 34-42.
9. Petrova Zh.O., Slobodianiuk K.S., Hrakov O.P. Teoretychnyi analiz suchasnoho stanu pererobky yahid lokhyny vidomymy metodamy sushinnia [Theoretical analysis of the current state of blueberry processing using known drying methods]. Naukovi pratsi NUKhT 2022. Tom 28, No3. S.123-143. DOI: 10.24263/2225-2924-2022-28-3-13. (in Ukr.)
10. Petrova Zh., Slobodianiuk K., Grakov O. Determination of the influence of pre-preparation of blueberries (Vaccinium Corymbosum L.) on the total duration of drying. Eastern-European Journal of Enterprise Technologies, №2(122). 2023. P. 50-69.
11. S. Ivanov, O. Dekusha, L. Vorobiov, L. Dekusha and Z. Burova "The Synchronous Thermal Analysis Cyber-Physical System for the Wet Materials Properties Study," 2019 IEEE 14th International Conference on Computer Sciences and Information Technologies (CSIT), Lviv, Ukraine, 2019, pp. 197-200, doi: 10.1109/STC-CSIT.2019.8929763.
12. DSTU ISO 11357–4:2010. Plastmasy. Dyferentsialna skanuvalna kalorymetriia. Chastyna 4. Vyznachennia pytomoi teploiemnosti. (in Ukr.)
13. Bridle, P., & Timberlake, C.F. (1997). Anthocyanins as natural food colours-selected aspects. Food Chemistry, 58, 103-109.
14. Brownmiller, C., Howard, L.R., & Prior, R.L. (2008). Processing and storage effects on monomeric anthocyanins, percent polymeric color, and antioxidant capacity of processed blueberry products. Journal of Food Science, 73, 72-79.
15. Paulo Díaz, Olivia Henríquez, Javier Enrione, Silvia Matiacevich Thermal transitions of pulp and cuticle of blueberries, Thermochimica Acta, Volume 525, Issues 1–2, 2011, Pages 56-61, ISSN 0040-6031
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