Navitron Renewable Energy and Sustainability Forum

SOLAR THERMAL => Solar Cooking (using vacuum tubes or more conventional methods) => Topic started by: Paulh_Boats on May 28, 2007, 12:29:22 AM



Title: Solar powered coffee!
Post by: Paulh_Boats on May 28, 2007, 12:29:22 AM
Its easy for a solar panel to get to 80C and our coffee machine at work heats the water to roughly that temperature.

So.... I keep thinking all those quick cups of coffee with a 2kW kettle must add up to a lot of kWh that could be solar powered, somehow.

Here's the idea
Fresh mains water feeds a mini stainless steel heat exchanger, panel redirected to the heat exchanger and allowed to get up to 80C. Water held there for a while...but not forever so drain away the old stuff. Put instant coffee in the cup and fill up with the fresh hot water. Ta da!

Sensible or mad?

-Paul


Title: Re: Solar powered coffee!
Post by: PEMTEK on May 28, 2007, 12:47:47 AM
I have been thinking about this alot infact only on thrusday I setup a navitron tube I purchased while on Ivan training course up outside my workshop with a plastic container stuck to the top of it. It happily got 500ml of water to untouchable levels inside 30 minutes and within a few hours the water had almost gone.

Im  thinking that someone should make a device that clamps a tube to the wall and acts as a little kettle for outside your back door with a thermometer sticking out.


Title: Re: Solar powered coffee!
Post by: Ivan on May 29, 2007, 01:02:22 AM
you are overcomplicating matters - take a solar tube, remove heatpipe and aluminium bits, so you just have a glass twin wall solar tube.

Fill with water. Masking tape over top. Leave for 2hours. If you have good sunshine, you will heat around 2litres ofwater to 80-100C.

Glass is easy to clean before hand, so a hygenic way to produce coffee!! Might need a long bottle brush to remove scale every now and again. It's a great trick for shows. It's also a very cheap and useful tool for areas where people do not have a supply of safe drinking water.


Ivan


Title: Re: Solar powered coffee!
Post by: PEMTEK on May 29, 2007, 05:18:24 PM
Ill give that a go..  ;D


Title: Re: Solar powered coffee!
Post by: wyleu on June 06, 2007, 06:52:40 PM
Water placed, heated, coffee drunk.

I do like simple.


Title: Re: Solar powered coffee!
Post by: Ivan on June 16, 2007, 02:33:29 AM
congratulations Wyleu, I think you may be the first person (ever?) to do that.

Ivan


Title: Re: Solar powered coffee!
Post by: wyleu on June 16, 2007, 11:24:45 AM
It's tough at the cutting edge!


Title: Re: Solar powered coffee!
Post by: Amaterasu on June 18, 2007, 02:42:17 PM
you can also slide sausages down inside and cook them !


Title: Re: Solar powered coffee!
Post by: Ivan on June 19, 2007, 01:14:45 PM
I reckon the sausage idea might work!! Have you tried it, Geoff? I'll donate a tube if you want to give it a go

Ivan


Title: Re: Solar powered coffee!
Post by: martin on June 19, 2007, 01:20:55 PM
excellent idea! - we're intending to do the hot water trick at the Workhouse festival next week - we'll try it with some hamburger sausages - "McIvan's solar powered hotdogs" - somehow I think we'll keep that as a "demo" - I'm having enough difficulty locating all the info needed for H&S (great grandfather's preferences in loo roll etc.) as it is without having to do all the catering stuff too! ;)


Title: Re: Solar powered coffee!
Post by: Amaterasu on June 19, 2007, 01:42:53 PM
Ivan .......

I have a spare tube - so might give it a go this weekend.
I suspect sizing of the banger may be critical, then there is the oil selection (or not) plus seasoning.

I'll provide photos if it happens "!!


Title: Re: Solar powered coffee!
Post by: Mike N. on June 19, 2007, 04:45:04 PM
and I was thinking of plotting a graph of insolation against time to produce the ideal soft boiled egg ....  ;D
(I was going to try poached but the tube would be too difficult to clean out afterwards  :(  )
Mike


Title: Re: Solar powered coffee!
Post by: wyleu on June 19, 2007, 04:52:18 PM
Does anyone know where one can get hold of spaghetti a metre long?


Title: Re: Solar powered coffee!
Post by: Amaterasu on June 19, 2007, 04:54:11 PM
If you use spag thats a metre long you'll have no room for the bog!


Title: Re: Solar powered coffee!
Post by: wyleu on June 19, 2007, 05:01:35 PM
How about fish fingers, Captain Birdseye ?


Title: Re: Solar powered coffee!
Post by: rebeccac on July 03, 2007, 11:18:01 AM
We have no electricity in our old ruin in italy yet so we use solar showers to heat water but it takes 5 hours even on a hot day.I think these ideas for heating 'coffee' water are great!

Thanks all we'll give it a go.We are veggies so can't test it on the sausages or fish fingers!

www.myabruzzohome.com


Title: Re: Solar powered coffee!
Post by: wyleu on July 03, 2007, 10:42:51 PM
If Ivan could source a suitable cap then there's a nice little product...


Title: Re: Solar powered coffee!
Post by: Amaterasu on July 04, 2007, 08:26:49 AM
For those that are still waiting for pics............ of solar sausages.

I am still waiting for sufficient sun power.

The King and Queen of New Jersey are coming to stay this weekend, (Kate's sister and Brother in Law who live in the states) so I may try to impress them!


Title: Re: Solar powered coffee!
Post by: Antman on July 04, 2007, 01:15:39 PM
Well - look on the bright side. If you give 'em under-cooked 'solar' sausages, it's a good way of making sure they don't outstay their welcome  ;D


Title: Re: Solar powered coffee!
Post by: Ivan on July 09, 2007, 02:23:32 AM
Chris, I'd already thought about that - I have 200 winging their way to me. We're planning to offer Solar Powered Tea and Coffee at the BGG. I also hoping to test-run the rig this weekend at Brockhampton, as they are having a renewables weekend (if anyone fancies dropping in)

(http://www.nationaltrust.org.uk/main/w-vh/w-visits/w-findaplace/w-brockhamptonestate/)


Title: Re: Solar powered coffee!
Post by: compostwoman on July 15, 2007, 11:20:49 PM
Chris, I'd already thought about that - I have 200 winging their way to me. We're planning to offer Solar Powered Tea and Coffee at the BGG. I also hoping to test-run the rig this weekend at Brockhampton, as they are having a renewables weekend (if anyone fancies dropping in)

(http://www.nationaltrust.org.uk/main/w-vh/w-visits/w-findaplace/w-brockhamptonestate/)

I tried it at Lower Brockhampton..........it was good! ............also on offer was soup.and tea.........such a good idea!

and Ivan I was the compostwoman you chatted to, who gave you the book?  re the BGG?.....wait for a call....

and if you ever want more compost advice or IR advice..........pm me ;)


Title: Re: Solar powered coffee!
Post by: Joules on July 31, 2007, 10:00:56 PM
OK, I just read all the stuff about a solar kettle, and would like to know how I get hold of one....

                          Joules in Rotherham...

p.s
    Ivan we are also interested in a solar PV system, but need more info on that one.


Title: Re: Solar powered coffee!
Post by: Ivan on July 31, 2007, 11:09:02 PM
You can collect from Monmouth, Oakham, from the BGG, or from Solarwind in E. Sussex. More distributors will be adding to their product range soon. Unfortunately, not easy or economical to ship them by post!!


Ivan