engleski

Experimental testing of the heat exchanger with star-shaped fins

Increase of the heat flow rate by applying finned surfaces is common in gas-liquid heat exchangers. Thereby, devices with annular fins are frequently used. Demands for higher capacity lead to size and mass increase of heat exchangers which over time becomes a significant problem, especially if the appli- cation of stainless steel is required. The solution to this problem is in a more efficient heat exchange on the gas side. This paper analyses the application of stainless steel star-shaped fins which increase the turbulence of fluid flow with their shape and in that way the heat exchange. For this purpose, two heat exchangers of identical size were made: one with annular fins and one with star-shaped fins. Both heat exchangers were experimentally tested with the same equipment and under identical conditions in the Reynolds number range from 20 0 0 to 13, 0 0 0. The test results indicate an increase in the heat flux by 39.3% when applying the star-shaped fins relative to annular fins, with the reduction of the heat exchanger mass by 23.8%.

heat exchanger ; experimental testing ; enhanced heat transfer ; star-shaped fin

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