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Vol.1, No.3, 2022: pp.80-87

HEAT BALANCE OF COMBINED HEAT EXCHANGER AERODYNAMIC HEATING DRYERS

Authors:

Aleksey Kupreenko1

Khafiz Isaev1

Stanislav Mikhailichenko1

, Yury Kuznetsov2

Igor Kravchenko3,4

, Aleksandar Ašonja5

, Larisa Kalashnikova6

1Bryansk State Agrarian University, Bryansk, Russia
2Orel State Agrarian University named after N.V. Parakhin, Orel, Russia
3Institute of Mechanical Engineering of the Russian Academy of Sciences named after A.A. Blagonravov (IMASH RAS), Moscow, Russia
4Russian State Agrarian University – MTAA named after K.A. Timiryazev, Moscow, Russia
5Faculty of Economics and Engineering Management in Novi Sad, University Business Academy in Novi Sad, Serbia
6Orel State University named after I.S. Turgenev, Orel, Russia

Received: 22.04.2022.
Accepted: 14.07.2022.
Available: 30.09.2022.

Abstract:

Today, the use of aerodynamic dryers for drying various types of fruit crops is very current. In them, the electric energy spent on the drive of the centrifugal fan is transformed into thermal energy due to the mutual friction of the air flows circulating in the closed chamber. In order to increase the energy efficiency of the drying process, the heat of the waste drying agent was used in the research. The presented dryer was equipped with a combined heat exchanger. In order to predict the thermal performance of the combined heat exchanger depending on external factor variables, the dependence of the temperature of the fresh drying agent at the outlet of the combined heat exchanger on the dryer operation time is theoretically determined on the basis of the heat balance equation. The air solar collector in the combined heat exchanger made it possible to increase the temperature of the drying agent at the outlet by another 10 oC without extra costs of electrical energy. A comparative analysis of the results of experimental and theoretical studies showed their high convergence.

Keywords:

Heat balance equation, drying agent, combined heat exchanger, aerodynamic heating dryer

Volume 1
Number 3
September 2022