Comparative Study of The Performance of Different Solar Still (ME Thesis)
Muhammad, Junaid Ahsan Prof. Dr. Saleem Raza Samo
Comparative Study of The Performance of Different Solar Still (ME Thesis) - Nawabshah: QUEST, 2012 - 88p.
ABSTRACT
The clean and safe fresh potable water is the need of humanity. The world is facing sever scarcity of the potable water supplies due to population growth and industrialization. The researchers are working on various technologies to convert brackish water into the potable water. Solar stills are one of the techniques under research for production of potable water. This study comprises the comparative study of the Hexagonal Tomb and Dome Type passive basin type solar stills. Passive basin type stills are most promising, economical and simple solar still among its various types. In this thesis distillate yield performance, effect of operational parameters like water depth, area of the still, insulation of the still, orientation of the still and the effect of climatic parameter i.e., Ambient temperature, humidity, wind speed and solar intensity are investigated.
The distillate yield performance of both the stills is determined experimentally by operating them for two weeks. Average distillate yield of 1204.17 m l/m2, maximum distillate yield of 1396 m l/m 2 and minimum yield of 910 m l/m 2 was achieved for Hexagonal Tomb solar still. Whi le average distillate yield of 1041 .21 m l/m 2, maximum
distillate yield of 1236.9 m l/m 2 and minimum yield of 787.4 m l/m 2 was achieved for.
Dome Type solar still.
The deductions on the operational factors are drawn through graphical representation. Water depth found to be having significant effect and reduction in water depth is resulting in increased distillate yield for both stills. Distillate yield is also increasing with increase in area as dome type still is even adjusted for same area as the larger area Hexagonal still is, but distillate yield for the dome type remained less which shows solar radiations and climatic condition interact differently with small er and larger areas. It is also investigated
that improved insulation is resulting in more productivity in case of both still. East-West and North-South orientations are only investigated for Dome Type Stil l, as hexagonal still is occupying same orientation; East-West orientation of the solar still is resulting in more production from Dorne type still.
Both Stills are also investigated for the varying climatic conditions. A m bient temperature is found to have prominence i n prod uctivity of sti ll, average ambient temperature remained 29.71°C, and maxim um dai ly average temperature remained 3 L57oC minim um daily average tem perature found 25.57°C. Disti llate yield on the days with maximum daily average temperature is found more while compared to precedi ng and succeeding days. Hum idity is determ ined to have inverse relation with disti l late yield and more distillate yield is gained on the days with less hum idity whi le com pared to preceding and succeeding days. Maxi mum daily humid ity was 64%, Mini m um daily humid ity was 39 and average humidity remai ned 48.18%. Generally increase in solar intensity resul ted in more gain, but there is l ittle variati on i n resul ts due to water depth and other operational and cl imatic parameters. Minim um, maxim um and average Solar intensity were 9522, 1 1 1 16, I 0345 tux correspondi ngly. Wind speed found less significant and variable results are prod uced. However, m inim um, maxi m um and average wind speeds were 0.95, 3.1 and 1.81 rn/sec respectively .
It is concluded that Hexagonal Tomb Solar Still is better choice in terms of productivity while compared with Dorne Type Solar still. It is also resolved that operational and
climatic parameters are having significant impact on the performance of the solar stills. The Quality of distillate water from both the sti lls is accordi ng to the WHO guidelines/NEQS (Proposed).
Comparative Study of The Performance of Different Solar Still (ME Thesis) - Nawabshah: QUEST, 2012 - 88p.
ABSTRACT
The clean and safe fresh potable water is the need of humanity. The world is facing sever scarcity of the potable water supplies due to population growth and industrialization. The researchers are working on various technologies to convert brackish water into the potable water. Solar stills are one of the techniques under research for production of potable water. This study comprises the comparative study of the Hexagonal Tomb and Dome Type passive basin type solar stills. Passive basin type stills are most promising, economical and simple solar still among its various types. In this thesis distillate yield performance, effect of operational parameters like water depth, area of the still, insulation of the still, orientation of the still and the effect of climatic parameter i.e., Ambient temperature, humidity, wind speed and solar intensity are investigated.
The distillate yield performance of both the stills is determined experimentally by operating them for two weeks. Average distillate yield of 1204.17 m l/m2, maximum distillate yield of 1396 m l/m 2 and minimum yield of 910 m l/m 2 was achieved for Hexagonal Tomb solar still. Whi le average distillate yield of 1041 .21 m l/m 2, maximum
distillate yield of 1236.9 m l/m 2 and minimum yield of 787.4 m l/m 2 was achieved for.
Dome Type solar still.
The deductions on the operational factors are drawn through graphical representation. Water depth found to be having significant effect and reduction in water depth is resulting in increased distillate yield for both stills. Distillate yield is also increasing with increase in area as dome type still is even adjusted for same area as the larger area Hexagonal still is, but distillate yield for the dome type remained less which shows solar radiations and climatic condition interact differently with small er and larger areas. It is also investigated
that improved insulation is resulting in more productivity in case of both still. East-West and North-South orientations are only investigated for Dome Type Stil l, as hexagonal still is occupying same orientation; East-West orientation of the solar still is resulting in more production from Dorne type still.
Both Stills are also investigated for the varying climatic conditions. A m bient temperature is found to have prominence i n prod uctivity of sti ll, average ambient temperature remained 29.71°C, and maxim um dai ly average temperature remained 3 L57oC minim um daily average tem perature found 25.57°C. Disti llate yield on the days with maximum daily average temperature is found more while compared to precedi ng and succeeding days. Hum idity is determ ined to have inverse relation with disti l late yield and more distillate yield is gained on the days with less hum idity whi le com pared to preceding and succeeding days. Maxi mum daily humid ity was 64%, Mini m um daily humid ity was 39 and average humidity remai ned 48.18%. Generally increase in solar intensity resul ted in more gain, but there is l ittle variati on i n resul ts due to water depth and other operational and cl imatic parameters. Minim um, maxim um and average Solar intensity were 9522, 1 1 1 16, I 0345 tux correspondi ngly. Wind speed found less significant and variable results are prod uced. However, m inim um, maxi m um and average wind speeds were 0.95, 3.1 and 1.81 rn/sec respectively .
It is concluded that Hexagonal Tomb Solar Still is better choice in terms of productivity while compared with Dorne Type Solar still. It is also resolved that operational and
climatic parameters are having significant impact on the performance of the solar stills. The Quality of distillate water from both the sti lls is accordi ng to the WHO guidelines/NEQS (Proposed).