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Solar refrigeration has much application in the developing and developed countries. Food preservation and the vaccine storage is the main research in the developing country. The air conditioning is the interest in the developed country. The current produced in our country is comparatively less to supply to the rural places. There are many small villages in our country where there is no continuous power supply. The commercially available refrigerator run on the current, thus the people in the area where there is no electric supply cannot use the refrigerator.
The main aim of our project is to construct a refrigerator that can run even without the use the electric supply. There is a huge demand for cooling in many part of the world where there is no electricity. The conventional energy is much expensive and difficult to obtain where the Non-Conventional energy is cheap and easy to obtain. The power for the refrigerator is produced from the solar plate. The light ray falls on the semiconductor the ions get transfered, due to the transfer of the ions current is produced. The evaporation of the water leads to the cooling of the surface or the area. These principles are used to design the refrigerator.
Our country is surrounded by the sea on three sides thus the fishery is a main activity in our country, but the preservation is a main objective for the fisherman on the sea for 2 to 3 days in the sea. Thus solar refrigerator can be used by the fisherman’s to preserve the fish for the couple of days. Thus the solar refrigerator does not need the power supply so the refrigerator can be used in the sea for the number of days with the help of the solar power available from our sun. The refrigerator is eco-friendly and does not use any chemicals. The price of the refrigerator is comparatively low and can be easily accommodated by the society.
Why: Problem statement
The current refridgerators emit a lot of green house gases and these are a main reason for depletion of Ozone layer. So, Solar powered refridgerators can be used as this is more environment friendly. This causes no harm to the environment and the society in which we live.
How: Solution description
The use of solar powered refrigerator/freezers (R/F) is increasing because of the high reliability they provide. Also, the high efficiency dc refrigerators are being used more in residential applications because their cost is decreasing as larger numbers are manufactured. In most instances, the efficiency of the dc refrigerator is higher than an equivalent size ac unit. This reduces the power requirements accordingly. For PV powered refrigerators, the mode of operation directly affects the total system cost. Factors such as number of users, door opening habits, seasonal use variations, time of loading, temperature of incoming material, and physical location of the unit will significantly affect the amount of power required. User training in proper operation and maintenance should be a part of any project to install R/F systems in remote areas.
The World Health Organization has specified PV power be used for medical vaccine refrigerators in numerous countries around the world. Many dollars worth of vaccine can be ruined if not maintained at the recommended temperature. This requires a reliable power source for the refrigerator.
Agricultural goods and milk cooling refrigeration
Solar PV is a promising alternative solution for cooling and preserving a variety of perishable goods, especially agricultural and dairy products as well, in areas with difficult access to the electricity supply, as is the case in developing countries or isolated rural areas. The simple technology applied to the refrigeration facility and the fact that it lacks complex electronics makes it possible to use and repair the system without external help.
Traditionally solar-powered refrigerators and vaccine coolers use a combination of solar panels and lead batteries to store energy for cloudy days and at night in the absence of sunlight to keep their contents cool. These fridges are expensive and require heavy lead-acid batteries which tend to deteriorate, especially in hot climates, or are misused for other purposes. In addition, the batteries require maintenance, must be replaced approximately every three years, and must be disposed of as hazardous wastes possibly resulting in lead pollution. These problems and the resulting higher costs have been an obstacle for the use of solar-powered refrigerators in developing areas.
Of late, some companies have come up with more efficient and low cost solar power refrigerators. One such company is Promethean Power Systems, Cambridge, MA.
Promethean Power Systems has developed a solar-powered refrigeration system for commercial cold-storage applications in off-grid and partially electrified areas of developing countries. The technology enables food suppliers to store and preserve perishable food items—such as milk, fruits and vegetables—without the need for expensive diesel-powered generators.
The hybrid solar & grid-powered refrigeration system is designed for mission critical refrigeration applications that must operate 24 hours a day, 365 days a year. The combination of solar and grid power provides a necessary backup mechanism and eliminates the need for a dedicated diesel generator. The company’s first product, Antarctica 250, is a milk chiller with cooling capacity 250 liters per day and storage capacity of 500 liters.
According to the company, since the system use solar energy for part of energy input, operating cost is 50% lower than the operating cost of an equivalent grid-powered unit and nearly 80% lower than that of a diesel-powered unit.
Technology: The refrigeration system uses a thermal battery system to store cold energy during daytime using solar power and nightime using grid power. A “black-box” electronic control unit runs the entire system, minimizes energy consumption and optimizes the use of available solar and grid power. The hybrid-power optimizer uses proprietary algorithms to efficiently transfer solar and grid power to the thermal battery and electrical loads.
How is it different from competition
More cost-effective and efficient than other power source refridgerators.