Zhu Dong-sheng

Study on Fabrication Technology and Melting Heat Transfer Process of Salt/Ceramic Composite Phase Change Energy Storage Materials

A novel spontaneous melt infiltration methodology was developed for the preparation of salt/ceramic composite phase-change energy storage materials (CESM). Thermo-physical properties including phase change latent heat, thermal energy storage density, thermal conductivity, specific heat and thermal diffusivity were measured detailed. The composition and micro-structure were characterized by SEM and XRD. Numerical simulation by finite difference method and experimental studies on melting heat transfer process of CESM were performed. The results demonstrated that this methodology is effective and successful to prepare energy storage materials using Na2SO4/SiO2 as an example and numerical simulation results of melting heat transfer process are in good agreement with experimental results.

Triple Reverse Cool Adjustment and Control Technology with DCS

A kind of new regulative and control technologies is proposed in this article, which is used to adjust the temperature and cool of supply water reversely from air conditional terminal equipment, second cooling station to centralized cooling station in tune. The cold energy regulative technology of constant flow rate and variable temperature difference with self tuning PID algorithm based on expertise is used to increase the supply chilled water, furthermore improves the efficiency of refrigerating compressor. This method has been put into operation with district cooling system in Guangzhou University town with great satisfactory and would be widely used in the future.