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Towards latent heat storage in the low-to-medium temperature range (70–250 °C), screening of sugar alcohols and their binary eutectic mixtures as potential phase change materials was carried out by focusing on the non-isothermal melting and crystallization behaviors. A preliminary screening shortened the long list of isomers from common four-carbon to six-carbon sugar alcohols to only six affordable...
Recently, more and more attention is paid on passive energy saving technologies in buildings, including night ventilation and thermal mass. In the paper, a porous building model is proposed to investigate wind and thermal environment around and inside an isolated building on different amounts of night ventilation and amounts of thermal mass. Inside the building, the Brinkman-Forchheimer extended Darcy...
The increasing penetration of wind power has led to a growing interest in that wind turbines (WTs) are operated with global-power regulation, which refers to de-rating and rated power regulation. In this study, the conventional control method is introduced and analyzed. The analysis results show that the conventional control methods may not provide sufficient performance when the WTs are operated...
The existing model predictive control (MPC) algorithm for variable-speed wind turbines (WTs) is using continuous control set and solved by a quadratic programming method. Its main drawbacks are the heavily computational burden and the difficulty to implement. This paper introduces an alternative MPC method by using finite control set, which is used in controlling WTs at the first attempt. To do this,...
To avoid the coincidence between the tower nature frequency and rotational excitation frequency, a SEZ (speed exclusion zone) must be built for a two-blade wind turbine with a full rated converter. According to the literature, two methods of SEZ-crossing could be adopted. However, none of them have been studied in industrial applications, and their performance remains unclear. Moreover, strategies...
Based on our previous work, the AEGs (annual energy gains) could be obtained on energy and exergy analysis for a sinter cooling bed. In the present study, a method synthesizing both economic cost and energy benefit aspects of the sinter cooling bed is proposed. Firstly, the GP (genetic programming) is employed to derive accurate correlations between the AEGs and operational parameters. Then, the economic...
In the present paper, a numerical study is presented to investigate the cascade utilization of waste heat in sinter cooling bed. With the aid of CFD (computational fluid dynamics), a two-dimensional unsteady mathematical model, which would significantly reduce the computational time, is established to describe three-dimensional steady flow and heat transfer in sinter cooling bed. The Brinkman–Forchheimer...
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