03-04-2010, 03:20 PM
hello sir/madam as i'm giving a technical seminar on solar refrigeration, i need information on this topic , so please get me the details of it .. thank u
03-04-2010, 03:20 PM
hello sir/madam as i'm giving a technical seminar on solar refrigeration, i need information on this topic , so please get me the details of it .. thank u
04-04-2010, 10:13 PM
Refrigeration systems that use environment-friendly refrigerants provide a sustainability advantage when compared to other refrigerant selections.using solar as the primary energy source is attractive prospect because of its universal availability, low environmental impact, and low or no ongoing fuel cost.three approaches that use solar energy to provide
refrigeration at temperatures below 0°C (32°F) are discussed below: Vapor Compression Refrigeration In the vapor compression cycle, cooling is provided in the evaporator as low temperature refrigerant entering the evaporator as a mixture of liquid and vapor at State 4 is vaporized by thermal input from the load. The remaining equipment in the system reclaims the refrigerant and restores it to a condition in which it can be used again to provide cooling. The major energy input to a vapor compression refrigeration system is the mechanical power needed to drive the compressor.Two of the solar refrigeration systems considered here rely on the vapor compression refrigeration cycle in some form. The third solar refrigeration system uses thermal energy as the primary input to the cycle. Open cycle systems that use water as the refrigerant, such as the solar desiccant cycle, could be used to provide cooling at temperatures above freezing Photovoltaic Operated Refrigeration Cycle Photovoltaics (PV) involve the direct conversion of solar radiation to direct current (dc) electricity using semiconducting materials. In a simple implementation one would expext, the Solar photovoltaic panels produce dc electrical power that can be used to operate a dc motor, which is coupled to the compressor of a vapor compression. to operate at high effi ciency, it is essential that the voltage imposed on the PV array be close to the voltage that provides maximum power.One solution to this is a maximum power tracker can be used which, in effect, continuously transforms the voltage required by the load to the maximum power voltage. Solar Mechanical Refrigeration It uses a conventional vapor compression system driven by mechanical power that is produced with a solar-driven heat power cycle.a Rankine cycle is the best suited cycle.in this a fluid is vaporized at an elevated pressure by heat exchange with a fl uid heated by solar collectors refrigeration system. for more , refer this pdf:
22-10-2011, 05:45 PM
sir i want full report on solar refrigeration
24-10-2011, 11:08 AM
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27-02-2012, 11:41 AM
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31-05-2012, 05:26 PM
solar refrigeration
SOLAR REFRIGERATION SYSTEM project report full.pdf (Size: 6.14 MB / Downloads: 282) Abstract In the present study, the heat flux received by a bubble pump, which was simulated to a vertical tube 1 m long and with a variable diameter, was optimized. A numerical study was carried out in order to solve balance equations concerning the water-ammonia mixture in the up flow. The two-fluid model was used to derive the equations. A numerical study was carried out on a heat flux between 1 and 70 kW m-2 and the liquid velocity was determined. PROJECT OUTLINE When we started with our project, we were planning to utilize the nonconventional energy resources like solar energy for domestic purposes. While considering the power utilization of various domestic appliances, by knowing that a major amount of power is drawn by refrigerators, we planned to make use of solar energy to drive refrigerators which will be more economical with less wastage of electrical power. Mostly used refrigerator systems are vapour absorption and vapour compression of which vapour absorption system is more suitable when heat is used as the energy input. DESIGN The design of solar Electrolux refrigeration system consists of design of solar collector design of Electrolux refrigeration unit Solar collector Solar parabolic collector is used as a principle of solar thermal heating system. Solar thermal systems convert sunlight into heat. "Flat-plate" solar thermal collectors produce heat at relatively low temperatures (80 to 140°F [27 to 60°C]), and are generally used to heat air or a liquid for space and water heating or drying agricultural products. Concentrating solar collectors produce higher temperatures. Design considerations The structure of the reflector can be divided into two parts as (a) the shell- the supportive structure & the living area exposed to sun. (a) The shell must be strong to withstand various environmental factors like wind, seasons, etc., to maintain its required shape. This shape decides efficiency of the whole system supported by selective lining. Radiations on the horizontal surface were the collector is placed. The part of solar radiation that reaches the surface of the earth without being scattered , absorbed or reflected is direct radiation ant it’s the most intense.the intensity at the direct radiation reaching the surface at earth is a function of time at the day, latitude location and declination angle. To calculate the direct radiation reaching the earth surface as a function of time & the day, for a location (γ) with the sun at declination (δ). Calculation of reflector area In the Electrolux refrigeration system the ammonia is used as a refrigerant. In this system the strong ammonia solution in the generator is heated by applying external source. Here the generator tube is heated by hot water from the solar collector. When the heat is applied the ammonia vapourizes from the ammonium hydroxide solution. In normal conditions or in atmospheric pressure, the ammonia vapourizes in -330C. Here the system is in pressure of 10 bars. Then the temperature required to vapourize the ammonia is 250C. So there will be a temperature more than 250C is required to vapourize ammonia.
02-06-2012, 10:39 AM
SOLAR REFRIGERATION
SOLAR REFRIGERATION.ppt (Size: 1.94 MB / Downloads: 108) HISTORY: The idea for a solar refrigerator first occurred to an engineer named Otto Mohr in 1935. He wanted to create a refrigerator that wouldn't require any energy other than exposure to sunlight for two hours per day. Since that time, more engineers, scientists, and researchers have all developed prototypes based on Otto Mohr's original work. PRINCIPLE: With a solar refrigerator, the parts of the refrigerator - the compressor, condenser, and other components don't change. The way a refrigerator keeps food cool is through the process of evaporation. This is achieved by the electric motor powering a compressor, which turns the refrigerant gas into a liquid. In a solar refrigerator, the refrigerant is replaced with ammonia or lithium bromide mixed with water The heat of the sun is used to increase the pressure of the gas, which turns into a liquid. BATTERY SUPPLEMENTED SOLAR REFRIGERATOR: In this a combination of solar panels and lead batteries are used. This fridges are expensive and require heavy lead acid batteries which deteriorate in hot climates. In addition batteries must be replaced every three years this results in lead pollution. CONCLUSION: Refrigerators in most parts of the world use electrical power. This saps a vast amount of energy from power plants. Electrical refrigeration is a huge energy drainer but solar refrigeration can bring relief to the electrical grid and provide a less expensive energy alternative. Solar power refrigeration is a great idea that has been long coming.
03-10-2012, 10:49 AM
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