Four different types of solar cookers are available
1. Panel Solar Cooker: uses reflective panels to focus sunlight onto a pot.
These work finest in tropical climates or hotter months when wind and warmth loss will not solve solar cookers.
A cheap, aluminized cardboard panel cooker can warmth meals as much as 250°F. That’s lots since meals begin to prepare dinner at 180°F.
The design shown in the picture is made of polished aluminum and can heat foods to 350-400°F on a sunny, warm day. Solar cookers
2. Field Photo voltaic Cooker: have an insulated field topped with a clear glass or plastic cowl and a reflector or reflectors that warm the field.
Temperatures inside the metal box can reach 400° F, and cooking can be done almost unattended, like a slow cooker.
This cooker is preferable to the parabolic ones if small children are around.
3. Parabolic Photo voltaic Cooker: The Parabolic Photo Voltaic Cooker (or Curved Concentrator photovoltaic cooker) concentrates the Solar’s warmth onto the underside or the perimeters of a pot— just like a stovetop.
Temperatures can reach above 400°F in the pot.
The benefits are velocity and the potential to prepare dinner when it’s cool exterior.
The disadvantages are security issues (as to eyes and kids) and the necessity to stir the contents of the pot, so the meals don’t stick, identical to a stovetop.
The parabolic cooker may additionally want the adjustment to maintain it confronted towards the solar.
4. Go Sun Solar Cooker: this new solar cooker—winner of a 2016 CES Innovation Award —doesn’t fit into any of the traditional categories.
The meal is slid into a glass vacuum tube surrounded by parabolic reflectors.
The vacuum impact helps maintain the warmth —inside temperatures rise to 550 °F, as sizzling as any gasoline-powered grill.
Water heating is likely one of the most typical purposes of photovoltaic power for home and industrial purposes.
Active Solar Water Heating Systems: uses a pump to circulate the water between the tank and the collectors.
1. Direct circulation methods: Pump’s flow into family water by the collectors and into the house. They work properly in climates, the place it hardly ever freezes.
2. Oblique circulation methods: Pump’s flow into a non-freezing, heat-transfer fluid by the collectors and a warmth exchanger. This heats the flow of water that then flows into the house. They’re standard in climates liable to freezing temperatures.
Solar water heaters
Passive Solar Water Heating Systems rely on natural convection to circulate the water.
1. Integral collector-storage passive systems: Work best in areas where temperatures rarely fall below freezing. In addition, they work properly in households with important daytime and night hot-water wants.
2. Thermosyphon methods: The water flows through a system when heat water rises as cooler water sinks.
The collector has to be put under the storage tank so that heat water will rise into the tank.
These methods are dependable:
However, contractors should pay careful consideration to the roof design due to the heavy storage tank. They’re often dearer than integral collector-storage passive methods.
Integral collector-storage passive systems Solar cookers
Thermosyphon systems Applications of Solar Energy Solar cookers
Solar Drying Technology
Drying is the oldest preservation technique of agricultural/animal products.
Sun drying is still widely used for the preservation of these products in the tropics and subtropics.
Photovoltaic drying is an elaboration of solar drying, and it’s an environment-friendly system of using photovoltaic power.
In a solar dryer, air enters the drying chamber through the process of natural convection (due to natural thermal gradient) or forced convection (through an external source like a fan, pump, suction device, etc.).
Air will get heated. After all, it passes by the chamber, after which it partially cools because it absorbs moisture from the meal’s product positioned within the chamber. Then, the humid air is eliminated by an exhaust fan or chimney.
Natural Convection Type Forced Convection Type
Various types and designs of solar dryers are available, such as solar tunnel dryers, improved versions of solar tunnel dryers, roof-integrated solar dryers, and greenhouse-type solar dryers.
solar tunnel dryer roof-integrated solar dryer greenhouse-type solar dryer Solar cookers
Advantages of solar drying:
1. The rate of drying increases with higher temperature and movement of air in the chamber.
2. Meals are enclosed within the dryer and, due to this fact, protected against mud, bugs, birds, and animals.
3. Higher temperature prevents insect infestation, and the faster drying rate reduces the risk of spoilage by microorganisms. Solar cookers
4. The dryers are waterproof; therefore, the food does not need to be moved during the rainy season.
5. c can create a dryer from locally available materials at a relatively low-cost material.
6. Solar dryers last longer. A typical dryer can final 15-20 years and can want minimal upkeep.
Limitations of solar drying:
1. Can only be used during daytime when an adequate amount of solar energy is present.
2. Lack of skilled personnel for operation and maintenance. Solar cookers
3. It Takes longer as compared to the modern type of electric dryers. Solar cookers
4. A backup heating system is necessary for products requiring continuous drying. Solar cookers