Although autoclave is considered to be the basic equipment for disinfection of medical equipment in health care facilities in developed countries, it is often not available in developing countries with limited power supply. < / P > < p > the principle of the autoclave is to put the articles in high-pressure steam for at least 30 minutes, during which the bacteria are killed. This steam comes from water and is heated by electric heating or burning fuel… In poor areas, this fuel may be just as scarce. This is the function of solar autoclave. Designed by MIT in collaboration with the Indian Institute of technology, it combines a tank to release water (by gravity) into a set of pipes. The tubes are bonded to the bottom of a copper plate with an endothermic black coating on the top surface. The surface is also covered with a transparent silicon-based aerogel, which allows sunlight to pass through – heating the plate – and preventing heat from escaping from the board. In addition, polished aluminum mirrors on both sides of the board help to focus sunlight on the board. < / P > < p > as a result, the plates become very hot, causing the liquid water in the pipe to become steam. This steam rises to the top of the equipment, where it is squeezed into the actual autoclave itself through another pipe. < / P > < p > a small version of the device was tested in Mumbai and worked well even in cloudy skies. Based on its performance, a solar collector with an area of about 2 square meters (21.5 square feet) was determined to be sufficient to power a small autoclave (such as one used in a doctor’s office). At present, the cost of aerogel manufacturing at

is quite high, but it is hoped that once a more economical production method is developed, the manufacturing cost of the whole device will not exceed $160. Besides, most of the materials can be used by users, besides aerogels, so they can build their own systems. Global Tech

By ibmwl