Optimizing heat transferring surface shape of brazed plate heat exchanger
2019
Li, R., Eko Air Ltd., Salaspils (Latvia) | Odintsov, A., Eko Air Ltd., Salaspils (Latvia) | Sidenko, S., Eko Air Ltd., Salaspils (Latvia);Riga Technical Univ. (Latvia)
Brazed plate heat exchangers are widely used in many areas of present industry, which indicates their advantages instead of traditional shell-tube heat exchangers. The using of rational combination of the shape and dimensions of the channels in combination with a correct layout of the heat exchanger allows to achieve a higher heat transfer intensity than in the shell-tube ones. The purpose of this work is to optimize the shape of the heat transfer surfaces of the plates, to improve the thermal properties of the plate heat exchanger and further introduction of it into production. As a base model the plate heat exchanger type 538 was chosen. In this work the surface shape of the plates of the heat exchangers was optimized taking into account the flow characteristics in the channels. Thermal and hydraulic parameters of the base and optimized surface were calculated by using the software package UNICALC Predict. Comparison with the base model calculations has shown that a heat exchanger with an optimized shape has a higher heat transfer coefficient up to 6 % and decreased hydraulic pressure drop up to 9 % as well as a higher heat transfer intensification effectivity coefficient ≈9 %. Based on the obtained calculation results a prototype of the tool and prototype of the heat exchanger with improved thermal properties were designed and manufactured.
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