Solar Dish Cookers for sale

Solar Dish Cookers- For Sale 

Rate Rs. 7000.00 only for SK-14  Solar cooker

Solar dish concentrator concentrates radiations of sun on receiver / cooking pot through all the day from 9 a.m. to 6 p.m. It tracks the radiations of sun manually. Parabolic dish consists of set of high reflective Aluminum Sheets. Normally, dish cookers has an area 1m^2, 1.4 m^2, 3 m^2 or of 4 m^2 of elliptical or parabolid shape.

1. SK 10 Dish Cooker: Cooking capacity for 5 to 8 person (3 liters)

2. SK 14 Dish Cooker: Cooking capacity for 8 to 12 people (5 liters) 

3. SK 30 Dish Cooker: Cooking capacity for up to 40 people (25 liters)

4. SK 40 Dish Cooker: Cooking capacity for 50 people (35 liters)

Applications in Rural Families who use traditional Mud Stoves, uses Fire-wood, Cow-dung and Crop residue etc. Residential schools, mid-day meal program, Military & Defense teams deployed in remote and urban areas, Small Canteen facilities to Employees, and many more Catering up to 50 persons daily.

(ii)  Dish Type Cookers

It is useful for joint families, small establishments etc. catering to about 15 persons at a time. The cooker can be easily assembled and dismantled and can also be packed and transported easily. The cooker is user-friendly as the place of the vessel to be kept for cooking is at a level convenient for people to use.

Configuration

It is a concentrating type parabolic dish cooker with aperture of 1.4 m diameter and focal length 0.28 m. The reflecting material used is anodized aluminium sheet with a reflectivity of over 75 %. The parabolic dish is made of reflecting sheets supported on suitable rings for holding them in fixed position. The sheets are joined together in such a way as to form a parabolic shape. The structure and frame of the bowl should be strong so that the reflectors do not get deformed while turning in various directions. The reflector stand is made of mild steel with powder coating.

Manual tracking arrangement is provided and adjustments may be made once in 15 to 20 minutes at the time of cooking. The stand is designed in such a way that the reflector could rotate 360° around horizontal axis passing through the focus and centre of gravity. It will also rotate around the vertical axis so as to turn the reflector in the direction of the sun.

Working Principle

The cooking vessel is placed at central point where all the sun’s rays are concentrated through the reflecting sheets to deliver energy equivalent of 0.6 kW to boil 2 – 3 litres of water in ½ hour. The temperature achieved at the bottom of the vessel is about 350°C to 400°C sufficient for roasting, frying and boiling. The cooker has a thermal efficiency of about 40 % and can be used on clear sunny days from one hour after sun rise to one hour before sun set.

Potential for use 

·         Cooking for individual house holds

·         Small catering establishments like dhabas, tea shops etc.

·         Small size canteens in industries.

·         Remote locations.

Economics  (Tentative)

Payback period is  2 years  against a life period of 10 years.

Principles of electric generation by solar cell

Introduction: Solar energy is god gift to human beings. Daily trillions KWh of energy falls on earth. The solar energy is in the form of different sizes of solar radiations. Among these are 7% ultraviolet (200nm – 380nm- Neno meter means 10^-9M), 47% visible wavelengths (380nm – 780nm) & 46% infrared (780nm – 5000nm). The average irradiation falls on the outside of earths’ atmosphere is 1367 watts/M^2. About 25% energy is absorbed or scattered by ozone, water vapors, dry air, upper & lower dust and rest of extraterrestrial direct normal irradiation  1000watts/M^2 reaches to earth surface.

The India is getting good share of it due to its position on the earth. The Barmer a western district of Rajasthan the state of India is receiving solar energy 6-6.5 KWh/M^2/day (Killo-watt hour per meter square per day). There are two processes to generate electricity . One is solar thermal and other is photovoltaic. Our discussion is towards electric generation by photovoltaic.

The solar radiation also called “PHOTON”. The meaning of PHOTO is “produced by light” and VOLTAIC is “electricity produced by chemical reaction”. Thus a photovoltaic cell means a device which produces electricity by light. The device by which electricity is produced is called solar photovoltaic cell.

Solar cell: Solar cell is made of 0.9999% pure silicon doped boron & phosphorus. Silicon has 4 electrons in its outer bond.  Boron has three electrons in his outer bond so there is vacancy for one electron , so it is positive & phosphorous has 5  electrons in outer bond so it is has extra electron , it is negative. Thus constituted silicon with boron & phosphorous is  P-N junction diode and  is called solar cell.  The movement of free electron are  always from p side to N side of P-N junction diode even in night also.

Types of Solar cells:

There are two types of solar cells generally used one is Crystalline and second is thin film.  Further Crystalline solar cell is divided as mono crystalline and poly crystalline depends upon their manufacturing processes. The mono crystalline cell has 13.5% to 15% efficiency, where poly crystalline has 0.5% less efficiency to mono crystalline. The poly crystalline is cheaper than mono crystalline solar cell. The amorphous is thin film solar cell, but it has 6 % to 7% efficiency. So space required for thin film solar cell is double the space required for crystalline solar cell for same power output. In my opinion always use poly crystalline solar cell.

Principles of electricity generation: Keep the ‘N’ side of solar cell parallel to sun so that sun rays fall perpendicular to surface of cell. The sun rays constituted of photons falls on the cell. Sum photons reflected back, sum passes through cell and some are absorbed for generation of electricity. The photons dislodge the electrons from ‘N’  surface  (CONTINUE)