| The salt-gradient solar pond has the dual functions in collecting and reserving solar energy, and it is praised as the most promising heat resource equipment that can storage large-scale energy for long-term in the future. Because the theory is simple and it can provide sufficient energy with lower running cost, the solar pond has been recognized and studied by every country in the world recently. This thesis has carried out the following work about the seawater solar pond:1.The model of seawater solar pond was build up, and the basic heat balance model, double-diffusive process model and turbulent entrainment model were analyzed. Based on the research of the models, the stability conditions and interface growth in solar pond are discussed.2.Results indicate that the turbidity of water is one of the main factors to affect the thermal efficiency of the solar pond. Increasing aqueous clarity can increase the operation efficiency of the solar pond. In this thesis, the method of using filtration and medicament to reduce the turbidity of medium in solar pond are experimentally studied.3.A set of equipments to measure the transmission of solar radiation in the water is designed and put to use. By the method of experiment, the relationship between transmission of solar radiation and the depth at different turbidity are studied using the ultrapure water, seawater, fresh water and the brine, which is treated to reduce the turbidity. And the result is contrasted with W.S. model.4.The transient performance of the solar pond is simulated by the finite difference method and the control volume scheme. The distributions of temperature and salt are analyzed, and the effect of slope wall, wind and consecutive cloudy days to the thermal performance of the solar pond are studied.The analysis of this thesis in the experiment of solar radiation transmission and the numerical simulation of the solar pond are elaborated, and the result can be referenced for the actual operation of the solar pond. |
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