The Research On Enhancing The Productivity Of Solar Still Using Micro-nanoparticle

Solar energy is a suitable green energy,which can be used in water desalination by the use of a cheap convenient device named solar still.Solar still is used for producing freshwater from sea,non-potable and brackish water,but its use is limited due to low productivity.In this work,we modified the conventional solar still to enhance the productivity of still using micro-nanoparticle.To investigate the effect of productivity enhancement of solar still using micronanoparticle,we firstly measured the particles' morphology of the graphite micronanoparticles and copper oxide micro-nanoparticles by using the optical microscope and the scanning electron microscope.Furthermore,the absorption and thermal conductivity were measured by using UV-Vis spectrophotometer and 3-? method,respectively.Then we built the experiment setup to investigate the effect.And to realize better performance of the solar still,we have done two parts of experiments.One part for studying the effects of the addition of two kinds of particles of copper oxide and graphite,the depth of the still,and the flow rate of the cooling water film,to get the maximum output.In addition,we also studied the performance of the coolant flowing through the glass surface as feed water.And the results showed that the optimum water depth of the addition of graphite micro-nanoparticles and copper oxide micro-nanoparticles is 0.5cm.The optimum concentration of the two materials is 1%,and the best cooling water flow is 4kg/h.In the second part,using the graphite,combined with phase change material and film cooling,reduced the loss of heat,increased the distiller output,increased the productivity.Therefore,we designed 4 kings of stills as following: still A,adding graphite micro-nanoparticles;still B,graphite micro-nanoparticles + phase change material;still C graphite micro-nanoparticles + water film cooling;still D,graphite micro-nanoparticles + phase change material + water film cooling.After these improvement,compared with the traditional still(30%),productivity enhancement of still D was up to 73.8%.This results of the work can provide a meaningful reference for the efficient implementation of desalination by using solar energy.