The gas-steam combined cycle unit has high thermal efficiency, low pollution to the natural environment, and high cost performance. It has become the first choice in the sustainable development planning of the power industry, especially for the steel companies. It is of great practical value to establish the mathematical model of the combined cycle unit, especially the thermal process model. However, due to the influence of multi-parameters and non-linear correlation in a typical combined cycle unit, this paper uses an improved genetic algorithm to identify four typical thermal process models. The simulation results show that it is highly consistent with the measured results and is consistent with the traditional genetic algorithm. In contrast, there is also a significant improvement in fitting accuracy, which proves the feasibility and effectiveness of the improved algorithm in this paper in the identification of typical thermal process models of combined units.
To overcome the disadvantages of the open loop seawater source heat pump (SWHP), a closed loop SWHP system with casted heat exchangers (CHEs) is presented in this paper. Consisting of closed-loop of pipes immersed in seawater, CHEs are devised for extraction or injection of thermal energy from/into the seawater. A mathematical model has been established and solved analytically to describe the heat transfer process of CHEs in summer. An experimental system has been built to simulate the heat transfer process. The experimental results show that the relative error of the temperature distributions along the CHEs between the experimental data and numerical simulation result is less than 5%. As a result, the mathematical model can be applied to optimization analysis of the CHEs used for SWHP systems.
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