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Časopis za procesnu tehniku i energetiku u poljoprivredi / PTEP
2009, vol. 13, iss. 2, pp. 97-101
article language: English
document type: Original Scientific Paper
published on: 13/10/2009
Sustainable energy model of the sucrose solution concentrating
University of Novi Sad, Faculty of Agriculture, Department of Agricultural Engineering



Projekat Ministarstva nauke Republike Srbije, br. 20065


The osmotic drying in sucrose solution contributes to the decrease of energy consumption within the total energy balance of the combined fruit and vegetable drying. The utilized solution as a by-product of the technology represents a problem. The sustainability of the fruit drying technology depends on the solution recycling efficiency. The solution can be regenerated by two major means: the thermal evaporation and mechanical filtration. Due to sensitive colloidal admixture, the temperature of the thermal treatment has to be low so as to prevent undesirable chemical reactions. Nanofiltration is an energetically favorable method but the issue of its efficiency is posed due to its high procurement and filter replacement costs. The ecological issue of the used nanofilter disposal is inevitable. My personal researches have been aimed at cheap solar energy consumption for the purpose of the heat requirements of the combined technology. The original device for the evaporation of the sucrose solution has been designed based upon the air solar heating. It is an apparatus for thermo diffusion with a large volume of filling. The heated air and solution of alternating electrical current. The tests have been conducted with two kinds of fillings. The first filling is made of stainless steel shavings and the second comprises plates. The coefficient of thermal efficiency has been established. Favorable results have been obtained with stainless steel shavings filling, which can be applied to the practical device. With plates, the concentrating is possible provided there is an inters pace of 30 mm or more between the plates. However, the efficiency of the device is considerably lower in comparison with the shavings filling. The lesser spacing between the plates leads to the interruption of the air flow due to the congestion between the plates. The specific heat energy consumption is around 5000 kJ/kg of the evaporated water with the shavings filling. The utilization of the filling made of stainless steel shavings is recommendable due to its notably lower price.



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