12/29/2023 0 Comments Net workdone in brayton cycle![]() ![]() And the thermal efficiency is about 31.85%, when the system operates stably at the design point of working condition. In this paper, the closed-loop simulation is innovatively performed to show the dynamic response to step-change in the heat source power and mass flow rate. The results show that the model has high accuracy, and can reflect the dynamic response of system performance under parameter perturbation. In order to verify the validity of the proposed model, the simulation results are compared with the experimental results conducted by Sandia Laboratory under the same conditions. ![]() In this paper, a comprehensive dynamic model of SCO 2 recompression Brayton cycle, which analyzes the response curves of critical parameters under the disturbance of heat source heating power and system mass flow rate, is accurately developed based on Simulink software. Therefore, it is necessary to study the dynamic response of the system performance under disturbance conditions, analyze the operating characteristics of the SCO 2 Brayton cycle system. However, due to fluctuations in the operation of the primary loop of the system with nuclear energy, parameters such as the power of the heat source and the mass flow of the working medium in the system will change, which will affect the dynamic performance and operation of the SCO 2 Brayton cycle system. The supercritical carbon dioxide (SCO 2) Brayton cycle has been regarded as the main development direction of future nuclear power generation by more and more scholars, due to its high environmental efficiency and high thermoelectric conversion rate. 2Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, China.1Key Laboratory of Complex Energy Conversion and Utilization, School of Energy and Power Engineering, Dalian University of Technology, Dalian, China.We have found that the optimized piston trajectories of the isothermal, isobaric, and adiabatic processes are the same when the compression ratio and the maximum volume of the same working fluid of the three processes are the same, which has facilitated the present analysis because the optimized piston trajectories of the Carnot and Stirling cycles are the same as those of the Brayton and Otto cycles, respectively.Qinghui Zhu 1, Ruiyan Han 1, Siyuan Yang 2, Bo Zhang 1* and Zhuqiang Yang 1 The Stirling cycle is much better than the Otto, Brayton, and Carnot cycles. For the Stirling cycle, the net work done is positive, and the thermal efficiency is greater than that of the Otto cycle described in our previous paper by a factor of about 2.7-1.4 for compression ratios of 5-30. The net work done by the Carnot cycle is negative even when the duration of heat addition is optimized to give the maximum amount of heat addition, which is the same situation for the Brayton cycle described in our previous paper. , we have calculated the maximum thermal efficiencies that are theoretically attainable by free-piston Stirling and Carnot engine generators by considering the work loss due to friction and Joule heat. Using the method of adjoint equations described in Ref.
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