Hydronic Heating

Posts Tagged ‘electricity’

I’m trying to develop an inexpensive solar cooler for camping.

I’ve made a solar box COOKER before, using nested cardboard boxes painted black, with aluminum foil glued on the inside. The black surface absorbs heat from the sun’s rays, while when the heat is re-emitted inside, the reflective foil tends to keep it in. It is a slow cooker which can develop about 325 degrees F.

Now I am thinking about trying the same idea inverted. I know I won’t be able to freeze things. but if I start with something frozen, could I keep it frozen this way without having to use those pre-frozen plastic containers of blue chemical?

Anybody ever make a cooler like this? anybody know how? Any sites for plans? (not the cooker sites, I already have those.)

Please include ideas for evaporative cooling using wet towels, if that has worked for you in the past. I’m trying to do this no-electricity, no chemicals, no bottle of gas. I want to travel light.

Thanks!

I’m trying to develop an inexpensive solar cooler for camping.

I’ve made a solar box COOKER before, using nested cardboard boxes painted black, with aluminum foil glued on the inside. The black surface absorbs heat from the sun’s rays, while when the heat is re-emitted inside, the reflective foil tends to keep it in. It is a slow cooker which can develop about 325 degrees F.

Now I am thinking about trying the same idea inverted. I know I won’t be able to freeze things. but if I start with something frozen, could I keep it frozen this way without having to use those pre-frozen plastic containers of blue chemical?

Anybody ever make a cooler like this? anybody know how? Any sites for plans? (not the cooker sites, I already have those.)

Please include ideas for evaporative cooling using wet towels, if that has worked for you in the past. I’m trying to do this no-electricity, no chemicals, no bottle of gas. I want to travel light.

Thanks!

Hi, I am doing a project for science. I have to create a basically passive solar water heater, using no panels, electricity, open flames, etc. to heat 200mL of water in 10 minutes. My idea is to take a shoebox, paint the base black, cover the sides with foil, and put in the container with the water. If needed, I will add a magnifying glass over the container. On top of the coverless shoebox, I will cover it with plastic wrap. I was hoping the plastic wrap will allow the sunrays to go in, and not to let out the accumulating heat out. Is this a plausible approach?
Edit: Thanks for the replies guys. This is really going to help me. How about if I just cover the base with foil too? That way, the only absorbing element will be the cup, which I will put a black construction paper roll on to help it absorb more heat?

Electricity cannot flow through which of the following?

A) Series circuit
B) Open circuit
C) Parallel circuit
D) Close circuit

2) Explain the difference between passive solar-heating system active solar heating system?

3) How much energy does the light bulb need in order to operate for 8 hours?