Longitudinally high finned tubes are rarely mentioned in compact heat exchanger design literature, despite their ability to provide considerable surface densities with low pressure drop. This paper describes their use in the design of a compact heat exchanger for pre-cooling diesel exhaust gases at about 600 Grad C (1100 Grad F) on tractor/locomotives operating in underground coal mines. The service imposed severe design constraints: (1) mounting space was limited in height, width, and length, thus requiring an enhanced surface; (2) a maximum pressure drop of 7 mbars (0.1 psi) was allowed for the exhaust gases; and (3) all outside surfaces had to be kept below about 150 Grad C (300 Grad F) to prevent explosion of coal dust and gases. The coolant was water/glycol mixture at about 78 Grad C (170 Grad F), with flow rate dictated by the pump capacity. Typical heat rejection was about 120 kW (about 400,000 Btu/h). This paper first addresses the thermal-hydraulic aspects of the design, and then the complexity of cooling the exterior surface, while conforming with structural requirements. It presents heat transfer coefficient and friction factor design curves, and some photographs and drawings of the successful application.
Cooling diesel engine exhaust gases using longitudinally finned tubes in a compact jacketed heat exchanger
Kühlung von Dieselmotorabgasen mit einen gekapselten kompakten Wärmetauscher, dessen Rohre longitudinal mit Kühlrippen versehen sind
1999
7 Seiten, 8 Bilder, 8 Quellen
Conference paper
English
Performance of NACA Type A finned-tube exhaust heat exchanger
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