Active solar distillation--A detailed review

All over the world, access to potable water to the people are narrowing down day by day. Most of the human diseases are due to polluted or non-purified water resources. Even today, under developed countries and developing countries face a huge water scarcity because of unplanned mechanism and pollution created by manmade activities. Water purification without affecting the ecosystem is the need of the hour. In this context, many conventional and non-conventional techniques have been developed for purification of saline water. Among these, solar distillation proves to be both economical and eco-friendly technique particularly in rural areas. Many active distillation systems have been developed to overcome the problem of lower distillate output in passive solar stills. This article provides a detailed review of different studies on active solar distillation system over the years. Thermal modelling was done for various types of active single slope solar distillation system. This review would also throw light on the scope for further research and recommendations in active solar distillation system.Active solar still Desalination Flat plate collector Review Solar pond Thermal modelling

Development Of Autonomous Robot For Tunnel Mapping Using Raspberry-Pi Processor

An autonomous robot plays an important role in the future of rescue operation in unknown environments. In this research a robot is capable of moving in tunnel and able to do operation in the tunnel. The robot is controlled wirelessly via Wifi communication using wifi router. The robot itself is equipped with a mini computer that is a Raspberry-Pi processor. The Raspberry-Pi is the brain for the robot as it gives out command on the movement of the robot and the data from the USB camera is collected and then transmitted to the computer. The robot is capable to go up 75 to 110 meters on Wifi signal. Once the connection is lost the robot will stop by itself. The robot is equipped with two batteries that last long and does run for more than 30 – 45 minutes. The robot is controlled via a computer that is programmed to run Ubuntu operating system. From the comfort of sitting in front of the computer the robot can be controlled from a distance and the live is then stream on the computer

Evaluating the influence of coir fibres on solar still efficiency and economic viability

The primary objective of this study is to determine the Coir fibres (CF) utilization in solar stills (SS) to boost the quantity of freshwater production. By placing dry CF fibres in the absorber basin, researchers were able to accelerate the rate at which water evaporated from the SS. Under various CF densities, the freshwater production of the absorber basin was measured (8, 11, 14, 18, 20, 23, and 26). The outcomes demonstrated that yield was raised by 27.23 percent after 18-fiber SSCF was added to the absorber basin. There were 14.27 percent, 19.40 percent, 24.57 percent, 25.00 percent, 16.28 percent, and 6.23 percent yield improvements for solar stills with 8, 11, 14, 18, 20, 23, and 26 fibres in the absorber basin, respectively, as compared to a CSS. The results demonstrate that compared to CSS, the cost to produce one litre of freshwater with SSCF is reduced by 23.1%. The return of investment for SSCF is much more immediate than it is for CSS. An estimated ₹242 was needed to produce 1 litre of freshwater using CSS, while an estimated ₹199 was needed to produce 1 litre of freshwater using SSCF. The payback time for SS was only 6.23 months, which was significantly less than that of solar panels. CF are preferable to other materials for use in the solar still due to their lower cost and higher energy efficiency