Batch Solar Water Heater 4 Month Update

A video follow up to my original video describing a batch solar hot water heater I built. The water heater is currently supplying the house as a preheater to the domestic hot water heater. Max water temp observed: 165F.

Category:

Science & Technology

Tags:

• Solar
• Hot
• Water
• Heater
• Batch
• Green
• Renewable
• Free
• DIY
• Sun
• Bread
• Box

[fotosepp]

Great work,

is the water tank a heavily insulated type or just metal. I am wondering if was insulated how well the heat transfers?

[KyleBostic]

@fotosepp The tank you see has been stripped of its foam insulation. The box and double paned glass do a good job of keeping the heat in at night.

[trailkeeper]

I see you have black coated insides of the collector box. Are the sides connected to the water tank in any way? Would it help to use reflective sides to reflect any heat energy back to the water tank?

[KyleBostic]

@trailkeeper The sides are not connected in any way, however, because the box is air tight, having black sides helps raise the temperature of the box to over 200 degrees on sunny days, this "bakes" the tank and adds additional heat. I tried mirrors on the side because I did design them angled with that option in mind, the result was actually less heat. I presume this is because the mirrors were reflecting some radiation out. Mirrors are best used in projects that actively track the sun.

[centervilletn]

excellent video....what state are you located in..i live in tennessee and was wondering if i can expect similar results...and one more question..what direction is your heater facing? south?

[KyleBostic]

@centervilletn I live in Palestine Texas, I would pull up the weather averages for your location and mine and compare them. The biggest factor is number of sunny days and length of daylight. Solar insolation charts used for solar panel installations tend to be good indicators of performance. This heater is facing directly south angled at 30 degrees (my latitude.) Thanks!

[HappyJackProduction1]

I know how to fix your over night heat loss problem.

[Prancinglion1]

Thanks for sharing your project with us...I am planning to build a solar preheater as well. I was wondering if placing solid bricks or 'pavers' in the box might absorb heat and slowly release it during the night. This might help with heat retention; would be interesting to know...

[pathman2]

A couple of "poiner's"....

[kevjay777]

Your refractor idea is sound, but they must be outside the box to direct the rays inside. Interior refractors direct light back out. Just think of a solar oven and how it works - same exact principle. Don't follow the design of most of the solar ovens on YT as most of them have their insides lined with foil.

A large fresnel lens would increase the heat a great deal during the winter. You'd have to be *very* careful about setting it up though. BTW you should've painted the exterior black also.

[ingesumadre]

put the mirrors out of the box to increase the sun grean house efect just reflect more sun to the glass and tank

[areeba2]

Hi, is the back of the tank touching the box or is it spaced away from it, was thinking of building one and tend to agree that painting the inside black would be better than using reflectors, would think that the tank would only need to be raised from the back if using the reflector method.

[trailkeeper]

@KyleBostic Ok, Your right, its a better than nothing approach, heating the air inside and letting the tank absorb some of that and/or reduced lossees from the tankk due to a lower temperature difference. I've learned a bit more since then, and almost forgot I asked this question.