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Application of Technology of Additive Manufacturing in radiators and Heat Exchangers

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Journal of Power and Energy Engineering 2022年第11期10卷 35-44页

作者： Chunhua Sun Guangqing Shang Department of Mechanical and Electrical Engineering Suzhou Vocational University Suzhou China Department of Electronics Engineering Suzhou Vocational University Suzhou China

radiators and heat exchangers play a key role in the long-term and stable operation of the equipment. The emergence of additive manufacturing technology has released the freedom of design, enabling many innovative structures of radiators and heat exchangers to be manufactured. The paper reviews the application of additive manufacturing in new radiators and heat exchangers. The technology of additive manufacturing boosts the development of new radiators and heat exchangers, which improves heat dissipation performance and heat exchange efficiency. This paper will provide a new idea and method for the development of radiators and heat exchangers via the application of additive manufacturing.

关键词： radiators Heat Exchangers Additive Manufacturing Heat Dissipation Performance Heat Exchange Efficiency

Temperature Control of Proton Exchange Membrane Fuel Cell Based on Linear Active Disturbance Rejection Control

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Journal of Power and Energy Engineering 2024年第5期12卷 1-23页

作者： Kashangabuye Bahufite Louis School of Automation Wuhan University of Technology Wuhan China

The performance of proton exchange membrane fuel cells is very sensitive to temperature. The electrochemical reaction results directly in temperature variations in the proton exchange membrane fuel cell. Ensuring effective temperature control is crucial to ensure fuel cell reliability and durability. This paper uses active disturbance rejection control in the thermal management system to maintain the operating temperature and the stack inlet and outlet temperature difference at the set value. First, key cooling system modules such as expansion tanks, coolant circulation pumps and radiators based on Simulink were built. Then, physical modeling and simulation of the fuel cell cooling system was carried out. In order to ensure the effectiveness of the control strategy and reduce the parameter tuning workload, an active disturbance rejection control parameter optimization method using an elite genetic algorithm was proposed. When the optimized control strategy responds to input disturbances, the maximum overshoot of the system is only 1.23% and can reach stability again in 30 s, so the fuel cell temperature can be controlled effectively. Simulation results show that the optimized control strategy can effectively control the stack temperature and coolant temperature difference under the influence of stepped charging current without interference or with interference, and has strong robustness and anti-interference capability.

关键词： Active Disturbance Rejection Control Elite Genetic Algorithm Expansion Tanks Coolant Circulation Pumps radiators

3D Conceptual Modelling and Direct Utilization Calculations of The Albanian Geothermal Resources

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Engineering（科研） 2013年第1期5卷 202-207页

作者： Nevton Kodhelaj Aida Bode Department of Energy Resources Faculty of Geology and Mining Polytechnic University Tirana Albania Department of Natural Resources Faculty of Geology and Mining Polytechnic University Tirana Albania

Balneological use of the Albanian Geothermal springs and waters dates back centuries, but the first modern use started in 1937. Unfortunately they had not been used for its energetic values yet. The temperature of the water is above 60 °C and the flow above 16 l/s, thus direct utilization is possible, in particular for space heating. Three-dimensional temperature field calculations and engineering calculations on a heating system with heat exchangers are presented here. The results show that the water temperature is expected to be stable and considerably higher temperature is expected through deep well drilling. The University’s Campus of Tirana is composed of 29 buildings, which are partially heated through a coal heater. The installed capacity is 2558kW while the coal consumption is about 920 kg/h. The University’s Campus of Tirana is one of the most important areas and with the highest density of population in Tirana, so it is the best area to show the heat exchanger efficiency. The economic analyses prove that the borehole heat exchangers are more convenient than the coal heating systems.

关键词： Geothermal temperature field modelling radiators wells borehole heat exchangers

3D Conceptual Modeling and Direct Utilization Calculations of the Albanian Low and Middle Enthalpy Geothermal Resources

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Journal of Energy and Power Engineering 2013年第8期7卷 1464-1471页

作者： Nevton Kodhelaj Aida Bode Department of Energy Resources Faculty of Geology and Mining Polytechnic University Tirana 1001 Albania Department of Natural Resources Faculty of Geology and Mining Polytechnic University Tirana 1001 Albania

The use of the Albanian geothermal springs and waters, for their curative effects （Natural SPA） dates back centuries, since the time of the Roman Empire, while their first modern use started only in 1937. Unfortunately they had not been used for its energetic values yet. The temperature of the water is above 60 ~C and the flow above 16 L/s, thus direct utilization is possible, in particular for space heating. Three-dimensional temperature field calculations and engineering calculations on a heating system with heat exchangers are presented here. The results show that the water temperature is expected to be stable and considerably higher temperature is expected through deep well drilling. The University＇s Campus of Tirana is composed of 29 buildings, which are partially heated through a coal heater. The installed capacity is 2,558 kW while the coal consumption is about 920 kg/h. The University＇s Campus of Tirana is one of the most important areas and with the highest density of population in Tirana, so it is the best area to show the heat exchanger efficiency. The economic analyses prove that the borehole heat exchangers are more convenient than the coal heating systems.

关键词： Geothermal temperature field modeling radiators wells borehole heat exchangers.