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Yang F.-Y.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Liu M.-S.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Liu T.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Zhao P.-F.,Henan Electric Power Company
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

The optimization of heat exchanger performance not only enhances the heat transfer and reduces thermal resistance, but also saves energy and reduces environmental pollution, which has an important economic value and social benefits in today's growing energy shortages. In this paper, the principle of equipartition of entransy dissipation and temperature difference in reference were improved by the method of programming iteration, which could be combined with practical application better. based on the two improved principles, the optimization effect were analyzed and compared in view of the carbon dioxide at different inlet mass flow. The results showed that the principle of equipartition of entransy dissipation was better than the principles of equipartition of temperature difference from availability and entransy dissipation number, so the heat transfer efficiency was also better. Source


Dong Q.-W.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Bai C.-P.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Liu M.-S.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Wang D.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2013

Trefoil-baffle support, one of the tube support structures, was extensively used in heat exchanger of nuclear power station. The performance of which had vital impact on working and security in steam generator. The influence on heat transfer and pressure drop by trefoil-hole height, support plate pitch and flow rate of trefoil-baffle support type heat exchanger had been studied numerically by means of the unit duct model. The results demonstrate that comprehensive performance of trefoil-baffle support type heat exchanger increased with an increase of trefoil-hole height and support plate pitch while decreased with the increase of shell-side flow rate. Source


Liu M.-S.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Yang F.-Y.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Dong Q.-W.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Zhang L.-N.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province | Cao K.,Key Laboratory of Process Heat Transfer and Energy Saving of Henan Province
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2012

Convection heat transfer of supercritical pressure CO2 in vertical tube was investigated, the changes of physical property near critical point of supercritical carbon dioxide, the effects of different inlet temperatures on heat transfer coefficient and the relations between heat transfer coefficient and entransy was analyzed. The results show that the physical property changes were very violently around the critical point, especially to the specific heat of carbon dioxide. It also conclude that inlet temperatures of carbon dioxide have small influence on heat transfer coefficient of big Re in mini-tube and heat transfer coefficient and entransy have the same variation tendency at different section. Source

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