الفهرس | Only 14 pages are availabe for public view |
Abstract The present experimental study aims to improve the productivity of a stepped solar still. To investigate this idea, a stepped solar still using PCM as latent store materials with internal reflectors integrated with an evacuated tube collector (first case) and a stepped solar still using a graphite and PCM as hybrid store materials with internal reflectors integrated with an evacuated tube collector (second case) was designed, implemented and operated at Tanta University under the climatic conditions of Egypt to obtain the better configuration. This study illustrated to effects the graphite, PCM, internal reflectors, and evacuated tube solar collector on the stepped solar still performance. The results show that the daily distillate production was varied between 11.24-11.29 and 13.6-13.62 L/m 2 day for the first case and second case, respectively. The daily efficiency was varied between 42.55 -42.62% and 51.7-51.82% for the first case and second case, respectively. This results indicated that the second case is more effective than the first case, the percentage improved in the daily productivity for second case as compared to first case varied between 20.64-21.05%. Also, the percentage improved in a daily efficiency for second case compared to first case varied between 21.48-21.64%. For increase the hot brackish water from rate from 15-35 ml/h, the daily productivity increases from 10.54-12.08 l/m 2 and 12.88-14.42 l/m 2 for the first case and second case, respectively. . |