PV Gap

Wendy Said:

I need to make a solar cooker for science class. Any suggestions?

We Answered:

Take a look at these things called "sun ovens", when I was in Haiti, we got them to about 250-300 degrees fairly regularly, depending on where you live it would be possible to boil water with something of a similar design.

Melanie Said:

Transformation of energy for refrigerator, torch, crackers, A/C, generator and solar cooker?

We Answered:

Hi Naughty_girl,
Refrigerator - Electrical energy into mechanical of pumping heat right from colder to hotter region.
Torch - electrical energy into heat and light
Crackers - chemical into heat and then into sound energy
A/C - (you mean air conditioning?) the same as that of refrigerator.
generator - mechanical into electrical in the presence of magnetic field.
solar cooker - heat energy into heat energy

Natalie Said:

physics problem please help calculating solar energy?

We Answered:

The energy collection rate , Edot , is :
--------------------------------------…

Edot = [ J ] [ EFF ] [ A ]

J = solar heat flux

A = [ Edot ] / [ J ] [ EFF ]

A = [ 240.0 ] / [ 850.0 ] [ 0.2000 ] = 1.412 sq. m. <---------------------------------------…

Joe Said:

What is a method to measure the amount of energy a solar cooker device consumes and produces?

We Answered:

For an estimate, search the web for the average solar insolation for your area for this time of year. From that, calculate the average energy arriving over your collection area each hour. For an actual measurement, line a small, closed glass container with felt, fill it with a carefully measured quantity of water, and measure its temperature increase. It will lose some heat to conduction, convection, and radiation, but it will absorb nearly all the energy landing on it.

To get the other measurement I think you want, build a second, identical unit but with no collectors or sunlight. Heat it electrically and measure how much power you need to apply to create conditions comparable to the solar unit (with identical food inside). That will give you the most meaningful comparison without complicated instrumentation.

Roger Said:

What are the best ways to increase accuracy and energy trapping ability of a solar cooker?

We Answered:

There are lots of ways to increase accuracy and energy. i am a chemist and i spend much energy in my job but i use Acai Berry and it helps me to increase my energy you can use it too i hope it can help you:

http://www.acaiberryselect.com/?aid=8234…