Experimental Studies of f-CNT Nanofluids in a Helical Coil Heat Exchanger

With the continuous development of internal combustion engine technology, the thermal efficiency of traditional energy vehicles has been difficult to improve, and the heat loss caused by high-temperature exhaust emissions is an important reason for the low thermal efficiency. To utilize the exhaust heat, the aim is to develop various spiral heat exchanger designs, namely, constant curvature heat exchanger with baffle and variable curvature heat exchanger. The idea is to perform numerical studies via CFD package and evaluate the performance of the spiral heat exchanger designs. PEC (performance evaluation coefficient) index is the relationship between the heat exchange intensity of the heat exchanger and the flow resistance of the working fluid. The results show that the PEC evaluation index of the heat exchanger is the best when the spiral diameter of the heat exchange tube is 120mm, and with the increase of the tube diameter and pitch, the overall performance of the heat exchanger decreases. The research on heat transfer enhancement of heat exchangers was carried out, and various spiral heat exchangers were designed based on the structure of spiral heat exchange tubes. The variable curvature heat exchanger has better overall performance than the baffle constant curvature heat exchanger. Compared to the single-variable curvature and the double-variable curvature, the maximum PEC difference of them does not exceed 0.01, and the double-variable curvature is more sufficient in volume utilization, it can save about 13% volume…

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Experimental Studies of f-CNT Nanofluids in a Helical Coil Heat Exchanger

Cited by 2 publications

References 39 publications

Evaluation methods of thermo-hydraulic performance in nanofluids: A comprehensive review

Evaluation methods of thermo-hydraulic performance in nanofluids: A comprehensive review

Computational Fluid Dynamics Study on Exhaust Heat Recovery of Various Spiral Tube Heat Exchangers

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