Papers by Author: Ren Yuan Zhang

Abstract: Corroded behavior of 310S stainless steel by molten Al-Si eutectic alloy in high temperature thermal cycles of 495～620°C was investigated. SEM/EDX, XRD and metallographic technique were used for observing and analyzing the morphology, composition and internal microstructure of the corrosion specimens. Results showed: on the surface of 310S stainless steel, after corroded through 300 melting-solidification thermal cycles, a corrosion layer of about 3μm thick, composed mainly of Fe2Al5 phase and FeAl3 phase was formed. Besides, upon observation of internal microstructure of 310S stainless steel after corrosion, plenty intercrystalline precipitation was present, which resulted in relatively severe intercrystalline corrosion. This was considered the principal factor that compromised mechanical property of the specimen of 310S stainless steel.

Abstract: To research for application of thermodiode in energy storage solar water heater, experimental research on heat transfer of thermodiode using myristic acid as heat storage material was made, starting characteristics of thermodiode using acetone and R134a was compared. Especially for working fluid of R134a, influence of thermodiode on heat storage process of myristic acid was tested for under different working conditions such as thermodiode’s positions, liquid charge ratios, etc. Test result shows, thermodiode charged with R134a was quicker in start-up than the case of myristic acid; with liquid charge ratio of 80% , heat transfer coefficient was the highest; with an inclination angle η=30°C of thermodiode plane to horizontal plane, an inclination angle α=10°C of heating-evaporating section to horizontal line, 25W power input and a liquid charge ratio of 80%, average heat transfer coefficient was 113 W/(m2·K).