Navitron Renewable Energy and Sustainability Forum

SOLAR THERMAL => Solar Cooking (using vacuum tubes or more conventional methods) => Topic started by: Gary T on December 30, 2007, 01:11:59 PM



Title: Anyone tried adding a reflector?
Post by: Gary T on December 30, 2007, 01:11:59 PM
As I see it, the present design of Solar Kettle using a single tube has 2 drawbacks.

1. It is a long and clumsey piece of glass to handle
2. It takes a long time to boil water, so is far less convenient than a conventional kettle.

If the idea were to take off, then it might be worth manufacturing a shorter and fatter tube for kettle use, an alternative being to offer a tap assembly to allow the tube to be permanently mounted with boiled water released on demand.

If that were done, it still leaves the matter of the slow boiling. To alleviate this, might it be worth offering a clip on reflector to allow direct sunlight to be concentrated on the tube. Even a fairly crude reflector should allow the water to boil several times faster.


Title: Re: Anyone tried adding a reflector?
Post by: frank2 on December 30, 2007, 01:27:59 PM
gary
a satellite dish with tin foil glued on gives a 2-3 inch focus and if distorted slightly turns oval shaped


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on December 30, 2007, 10:49:23 PM
Certainly a good idea, but it does become rather more technical to construct. It would be good to see how fast the water could be heated in a reflector system.

Navitron now has some shorter tubes (0.75m, 58mm), which, by my calculations, should heat around 1.1litres of water. These are a little more practical! We can also sell the 47mm demo panel tubes (we've got spares in now) - these are around 0.5m long, and I guess contain just under 1/2 litre of water.




Ivan


Title: Re: Anyone tried adding a reflector?
Post by: boscaiolo on January 05, 2008, 05:29:38 PM
I remember seeing designs for solar ovens and pots back in the 60's that used parabolic reflectors.  They were for subtropical use though...


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on January 05, 2008, 10:10:54 PM
You can use paraboilic dishes (eg satellite dishes with silver foil) to make a solar hob which works fine in the UK. It needs to be carefully aimed at the sun, and constantly repositioned (or automatically tracked). Solar ovens work well here, too, but again, they need to be pointed in the correct direction. The beauty of the Navitron solar tube kettle/cooker is that it works in pretty much any direction between E and W.


Ivan


Title: Re: Anyone tried adding a reflector?
Post by: billi on January 08, 2008, 12:17:24 AM
hi


there are plenty of solar cookers available  with reflectors etc....


if you have the sun then u use it 

but if you havenot  then use this kettle
http://www.kellykettle.com/       (its the best waterheater i know of , would be a good´stove design)

the  nicest tee on building sites .....




Title: Re: Anyone tried adding a reflector?
Post by: Bob on March 16, 2008, 08:02:13 AM
Years ago I say a type of kettle and sauce pan for use on gas stoves with a double side wall, closed at the top and open at the bottom.  This allowed the heat from the gas to be caught in the side wall.

I wonder if insulated cookware would be good?  single skin bottom twin wall side, possibly even with a vacuum?


Title: Re: Anyone tried adding a reflector?
Post by: Flamethrower_ on March 16, 2008, 08:54:37 AM
Bob,

I still use a kettle especially designed for use on a gas stove or hob. I bought it about 25 years ago but they seem to have disappeared from the market?
It has a base with what looks like an odd shaped coiled spring, presumably to increase the surface area for the flame.
It still works really well and is as quick as any electric kettle :)

Getting back to the thread I want to experiment with a reflector on a 58mm 800mm length evacuated tube but it won't be this weekend .
Torrential rain here in Oxfordshire! :(

Rob


Title: Re: Anyone tried adding a reflector?
Post by: Brandon on August 06, 2008, 09:34:50 PM
we had a solar kettle in 1997 that would boil water in 20 minutes of full sunshine, it had a folding and extendable parabolic(ish) reflector, I contacted my friend that used to sell them, but they stopped producing them. Shame, we used to stick it in the rucksack, and boil up at festivals etc, and serve tea whilst explaining the virtues of solar energy capture to the public.


Title: Re: Anyone tried adding a reflector?
Post by: MR GUS on August 06, 2008, 10:30:14 PM
Surely a pivot arm would do allowing the unit to swing side to side (clear of obstacles) for pouring, with a wire to prevent it slamming back hard, that way a reflector could be built in assuming the thing is going to be upright all the time to gather heat?

 A lip could be formed from polymer clay type material to assist the pouring (also takes heat well)

 


Title: Re: Anyone tried adding a reflector?
Post by: wyleu on August 07, 2008, 07:59:56 AM
The major inconvenience I've found with the solar kettl tube is it needs a stand of some kind to firstly mount it at something approaching an optimum angle and secondly to protect it from knocks that could easily snap off the glass teat at the bottom. If a simple stand were designed a curved reflector would probably be a worthy addition to it. If the whole kit and caboodle could fit inside the reflector for storage and traansport so much the better.


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on August 07, 2008, 12:19:50 PM
We've got clips which can be attached to wall or similar, that the tube can simply be clipped in and out of. Makes it more secure, and minimal effort required.


Title: Re: Anyone tried adding a reflector?
Post by: NickW on August 10, 2008, 08:16:22 PM
How about this then?

24-91 degrees in just under 2 hours.

Not bad for a bit of scrap wood and bubble wrap!



Title: Re: Anyone tried adding a reflector?
Post by: ajstoneservices on August 10, 2008, 08:33:03 PM
Pikey whistle


Title: Re: Anyone tried adding a reflector?
Post by: ajstoneservices on August 10, 2008, 08:34:44 PM
Hedgehog ready yet?


Title: Re: Anyone tried adding a reflector?
Post by: Bill H on August 10, 2008, 09:24:33 PM
C'mon Ivan  -  lets have a few of these new devices as freebies at the party !

If not - I'd even buy one  :P

regards

Bill


Title: Re: Anyone tried adding a reflector?
Post by: NickW on August 10, 2008, 09:35:16 PM
Pikey whistle


Bloody cheek ;)

If I recall correctly you live between the twin pikey capitals of PeterPikeyborough and Wisbech :norfolk


Title: Re: Anyone tried adding a reflector?
Post by: ajstoneservices on August 11, 2008, 04:28:35 AM
The new Cottenham is under way too >:( all nicely laid out in plots new roadways/water in and of course the local authority doing nothing about it >:( sh*tfan:


Title: Re: Anyone tried adding a reflector?
Post by: MR GUS on August 11, 2008, 10:03:10 AM
 person-fight!  ;D
 Cottenham IS bad for pikey's & the damage they have caused over recent years, (killing my families livestock & worse)

 ..Surely Wisbech & the surrounding area is now little pedeyborough-come-poland.

 When I visit there, I despair for the future of the english language, ..on one hand theres english speakers WHO I cannot understand due to their convaluted "Landon" speak which honestly comes out as a undefinable garble ..I have to guess initially that they're english, strain to hear cave-vowels.

 Then you have foriegn language partially dependant on the local accent to bring on their english! (shakes head in despair) ...It's a right merry go round!  banghead: banghead: banghead:
 
Little enclave cottenham is trying to spread it's wings here too! ..I can only suggest that you ring up the council & threaten a mass action on their Cambridge based backsides!
 The local CCC states that provisions have to be made for around an additional 39 pitches in the coming year or so.
Someone PLEASE counter that by asking about that additional pitches have been made & enlarged illegally at cottenham by forms of intimidation & spineless councils! ..why then do we need MORE that will do what they want anyhow! ..costing more to gloss over than to solve!


Title: Re: Anyone tried adding a reflector?
Post by: NickW on August 11, 2008, 02:30:43 PM
I do not live in Cottenham but a guy who works for me does and says the gypsie issue is totally overblown.

I thought SCDC had spent hundreds of thousands in the high court trying to enforce enforcement orders / injunctions etc. Unfortunately bleedin hearts and all that Human Rights stuff has swung it in the travelling folks favour.

As for the Poles they are fine. I have a polish lodger - an engineer who is as good as gold


Title: Re: Anyone tried adding a reflector?
Post by: MR GUS on August 11, 2008, 05:29:52 PM
 
yes poles work hard & are nice people!

 Thanks to whoever minus'd me (if it was for the gypsy comment OR for thinking I was out & out prejudiced against all & sundry)

 You try having serious security issues with your property & theft with them traipsing all over your land! ..despite actually helping them out on several occasions our family still had barns, livestock & business burnt out by them. so in all honesty go to hell if you believe me to be prejudiced, the suffering endured by those animals if perpetrated by anyone else would have had them dragged through courts by their hair!

 A very emotive & issue when you see charred animals dead, & others dying over a period of months!

 I hope whoever marked me down reads this & gets off their high horse!


Title: Re: Anyone tried adding a reflector?
Post by: MR GUS on August 11, 2008, 05:40:58 PM
 PS, anyone care to mark me down to -100 for a few minutes button pressing gets a prize.
 cheers! :D


Title: Re: Anyone tried adding a reflector?
Post by: CeeBee on August 11, 2008, 08:29:55 PM
PS, anyone care to mark me down to -100 for a few minutes button pressing gets a prize.
 cheers!

The forum only lets you award points to anyone once an hour. So that would take just over 4 days! They would deserve a prize! And don't worry about the points - the 'wily one' seems to give negative points to people as signs of approval, and I reckon I got my -ve ones for correctly telling someone what a kWh etc. was!


Title: Re: Anyone tried adding a reflector?
Post by: NickW on August 11, 2008, 08:32:42 PM

yes poles work hard & are nice people!

 Thanks to whoever minus'd me (if it was for the gypsy comment OR for thinking I was out & out prejudiced against all & sundry)

 You try having serious security issues with your property & theft with them traipsing all over your land! ..despite actually helping them out on several occasions our family still had barns, livestock & business burnt out by them. so in all honesty go to hell if you believe me to be prejudiced, the suffering endured by those animals if perpetrated by anyone else would have had them dragged through courts by their hair!

 A very emotive & issue when you see charred animals dead, & others dying over a period of months!

 I hope whoever marked me down reads this & gets off their high horse!


Alright Gus - Calm down surrender:. Im no fan of travelling folk either having spent most of my life in Cambridge and Norfolk. I know what most of them are really like and not the PC / fantasy world of rokka radio and other right on do gooder propaganda outfits.

As for Cottenham I was just relaying what a colleague who lives there said.

From what you say about your experiences you have my sympathies :)


Title: Re: Anyone tried adding a reflector?
Post by: MR GUS on August 11, 2008, 09:07:40 PM
 No worries nick, it was a general piece with no-one getting vollied.

 But when the Cottenham situation means loss of life, property, pets, livestock, screws their business and forces people out of the home & countryside they love it's pretty serious in my books.

 Like I mentioned, when they asked for help they were generally assisted so to do something as despicable as what occurred is not only "doorstep-crappin"  but demonstrates general attitude at face value.

 I can't ignore actions like that, nor can I forgive or be won over by phrases like "in the past" ,.. "a small minority"
 that's their lot! (the Cottenham lot)

 The suffering & the stench was awful.


Title: Re: Anyone tried adding a reflector?
Post by: wyleu on August 12, 2008, 11:15:56 AM
the 'wily one' seems to give negative points to people as signs of approval


The first problem is getting people to use the karma system, the second problem is getting the data to mean anything.



Title: Re: Anyone tried adding a reflector?
Post by: Bill H on August 12, 2008, 11:23:03 AM
Ha - how about a Karma trading system - kinda like carbon ...

To start things off -

What am I bid for a vicarious Smite  :)

Bill


Title: Re: Anyone tried adding a reflector?
Post by: wyleu on August 12, 2008, 11:50:00 AM
Ha nothing at all..


Title: Re: Anyone tried adding a reflector?
Post by: NickW on August 12, 2008, 07:55:31 PM
Back to my 'pikey' solar concentrator. Today the tubes must of boiled over - water at 96 degrees!


Title: Re: Anyone tried adding a reflector?
Post by: Colin_A on August 20, 2008, 05:25:31 PM
Hi All
I`m new to the forum and to solar in general (thanks Ivan for sorting out the registration prob btw).
I couldn`t find an introductions thread so i decided to post a hello here.
In a nutshell, i`m a mad scientist type and Nick`s solar kettle experiment is right up my street ;D
I would like to do something similar once i learn a bit more about evacuated tubes.

All the best
Colin







Title: Re: Anyone tried adding a reflector?
Post by: wyleu on August 20, 2008, 05:27:42 PM
This probably one of the best ways of appreciating the characteristics.
Get a tube with a core to understand the meaning of a greasy heat...   whistle


Title: Re: Anyone tried adding a reflector?
Post by: Colin_A on August 20, 2008, 07:27:33 PM
Hi Wyleu
In my book the hands-on approach is the best way to learn and usually the most fun.
I am considering buying a single 70mm single wall tube to play around with. I would like to experiment with a parabolic trough using the evacuated tube as the receiver so hopefully i`m still on topic with the thread.
 
I think the length of the 70mm tube is around 1.5m but I can`t find any info regarding the diameter or length of the protruding end of the heatpipe.
 I wondered if a small bore copper tube wound into a tight spring which fitted over the end of the heatpipe would function as a reasonable heat exchanger or perhaps a proper "plug-in" type manifold is available off the shelf?

Situation normal.. more questions than answers ;D

Colin




Title: Re: Anyone tried adding a reflector?
Post by: NickW on August 20, 2008, 11:12:23 PM
Colin

if you want to have a play with solar concentrators like I did use a 47 or 58mm tube as they are twin wall. In contrast a 70mm would be useless as they are single wall glass.


Title: Re: Anyone tried adding a reflector?
Post by: Colin_A on August 21, 2008, 12:17:54 AM
Hi Nick,
I had it in my mind the heatpipe surrounded by air would be less effective than the 70mm tube with the vacuum surrounding the heatpipe.
I was a little concerned how well the still air tube could cope with the air expanding with the heat versus the 70mm vacuum tube...always assuming a diy parabolic trough could multiply the radiation to the tube by some significant amount :)



Title: Re: Anyone tried adding a reflector?
Post by: Ivan on August 21, 2008, 01:04:52 AM
definitely go for the 47 or 58mm. The air expansion isn't a problem - there's a tiny hole in the top to allow pressures to equalise. And you have so much more flexibility with the twin walled tubes - have a look at the news pages on the Navitron website - we've been cooking curries, soup, tea, coffee etc directly in the twin wall tubes.

Incidentally, if the weather's good, it migh be a good opportunity for demonstrating some solar cooking at the Navitron party. Might have a go at another solar curry...


Title: Re: Anyone tried adding a reflector?
Post by: Colin_A on August 21, 2008, 01:21:28 AM
Thanks Ivan
Ok, 47mm or 58mm it is..more scope for experimenting is good  ;D
Any thoughts on the coiled pipe heat exchanger or is there a tried and tested method for transferring the heat from a single tube?


Title: Re: Anyone tried adding a reflector?
Post by: CeeBee on August 21, 2008, 11:05:09 AM
Any thoughts on the coiled pipe heat exchanger or is there a tried and tested method for transferring the heat from a single tube?

Hi Colin, and welcome. Sounds as though you're thinking along the same lines as me (but more practically!). I've got a spare 47mm tube - thought it would be nice to have one at ground level to show people or to try 'solar cooking'. But I'd rather try leaving the heatpipe in-situ than removing it and putting the water/food/etc. in the tube. So the problem is: what's a good way of transferring heat from the heatpipe tip to e.g. a saucepan, bearing in mind that the the tip needs to be at the top (otherwise the heatpipe won't work), and the arrangement will need to be well-insulated?

What next having wrapped your copper pipe round the tip? Other than having a pumped circuit much the same as we have in a proper panel?

As for reflectors: I keep thinking of the light fittings for fluorescent tubes often used in offices - there's one above me as I type. They have nice curved reflectors, and indeed I've got several of these (scrap from a previous office) in my 'might come in handy' pile. Only thing is, even a 47mm tube would take up more of the reflector's 'aperture' than the relatively narrow fluorescent tube.

And this thread has caused be to wonder how the 70mm single-wall tubes work at all: without the vacuum gap, won't the outside surface of the tube tend to get hot and lose heat? Anyway, however it is that they work, can't see why they'd be any worse for reflector experiments than any other kind (provided, of course, that you're going to keep the heatpipe, since you can't remove it!).


Title: Re: Anyone tried adding a reflector?
Post by: Colin_A on August 21, 2008, 02:29:28 PM
Hi CeeBee and thanks for the welcome,
I don`t have any answers but luckily i enjoy a challenge.
I`d like to experiment with the tube purely as an add-on system to a greenhouse project i have underway.
It doesn`t really matter how well it works just the fact that its "different" makes it worth a go ;D

The 58mm tube may be the better choice for me as its a bit longer than the 47mm and a similar price to the 70mm.
Ideally i`d prefer it to be a thermosyphon based system so it runs when theres enough sun to drive it.
The only downside is needing the tank above the tube but i guess with a single tube it wouldn`t need to be that big.
Logically, even without a concentrating reflector, if the quantity of water is geared pro-rata to the number of tubes/area, the temperature should be similar.
 


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on August 21, 2008, 03:43:34 PM
The 70mm tube is fully evacuated - ie heatpipe suspended in evacuated glass single walled tube.


The best way to use heat without removing the heatpipe would be something like this (this is a suggestion, rather than something I've actually tried): take a baked bean can, drill hole in bottom, solder in a piece of copper pipe into hole )blanking off the top of the copper pipe. Finally, insulate can, fill with beans and place in sunshine (It'll cook a lot faster directly in the glass tube, though!

Weather's good for the weekend, so we should be doing some solar cooking demos.


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on March 21, 2009, 07:17:39 AM
WAOOOOOOOOOOOOOOOOW!!!

Thanks for this thread, it made me discover the Kelly kettle, when I read about it I couldn t believe it! That's exactly what I was looking for. I ordered it strait away and received it yesterday.

So this morning I made my coffee with the  bits I cut off my garden last year when tidying my bush (nothing rude...). Works a treat, I boil  the water, put it in a big thermos and use it through the day.

I am also working on my solar cooker/oven, I have managed to raise water temp to 72 on wednesday, I made a cup of warm tea (i don t like it hot). I am changing the design now. Here is the "old design" (see piccie).



Stef


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on March 24, 2009, 11:08:54 AM
Hi There,

Following my  first attempt I decided to build another solar oven. I used only recycled material : an old draw, some plastic mirrors from a perfume display (was skipped by a shop, loads of mirrors...), some cardboard and paper for the insulation...

I will try it when the sun comes back, I also need to close the top of it (cling film probably).

http://farm4.static.flickr.com/3457/3382129328_7cb0ba7425.jpg?v=0 (http://farm4.static.flickr.com/3457/3382129328_7cb0ba7425.jpg?v=0)
http://farm4.static.flickr.com/3604/3382129332_50030bd795.jpg?v=0 (http://farm4.static.flickr.com/3604/3382129332_50030bd795.jpg?v=0)



Stef bike:


Title: Re: Anyone tried adding a reflector?
Post by: Amy on March 24, 2009, 11:31:20 AM
Thats a lot of pots of stew you have there.  ;D

I hope you get it all cooked before the clouds come over.


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on March 24, 2009, 09:21:13 PM
Hi hi hi, actually my goal is a vegetarian curry and some bread, June should do it !   wacko


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on March 24, 2009, 11:56:59 PM
have you seen this page - solar vegetarian curry cooked on an overcast summer day - http://www.navitron.org.uk/newsdetail.php?id=21

I made a similar curry at the Navitron party last year - so a few forum members have first-hand experience. Given the sunny days we've had recently, there'd be no problem making a curry on a good day in March.

The technique easily lends itself to pasta, spagetti etc.

P.S. we're using solar tubes for heating water most days now - for pre-heat for the evening's cooking and/or cups of tea.


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on March 25, 2009, 06:43:18 AM
Hi Ivan,

I'll try that one but 3 full pots of curry powder! Is that to use your trousers next day to cook the rice ???  Blimme you must like it hot, I'll have to stick to a couple of spoons of curry paste, and I'll still need some yoghurt!

Stef
 surrender:


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on March 25, 2009, 03:14:15 PM
No, not three pots of curry powder. It's a teaspoon of each except the garum masala (1/2 tsp). See recipe at top of page!


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on April 05, 2009, 07:41:14 PM
Some update on my solar oven, I have improved my system and managed to reach 90+ on Saturday despite the clouds. It's only the beginning of April so I should be able to cook something soon!

My Solar Oven (click on link) (http://sjaglin.homelinux.org/Joomla/index.php/component/content/article/37-energy/81-solar-oven)

Stef

 :garden


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on April 08, 2009, 03:25:41 PM
Yeepee!

Have reached the 100s at last and even 110 degrees celcius in April in the UK!! Really happy!

(http://farm4.static.flickr.com/3366/3424188314_19d7062178.jpg?v=0)

Stef


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on April 10, 2009, 01:23:05 AM
Still can't see your website - is it offline in the late evening? I've tried firefox and IE and both fail.


Title: Re: Anyone tried adding a reflector?
Post by: damnager on April 10, 2009, 08:32:00 AM
Ivan,
       On his home page he gives "opening Hours" as 07:00 to 22:00 mon-fri and 08:00-22:00 @w/e this probably means that a night owl like yourself gets around to trying too late  ;)

Keith


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on April 12, 2009, 12:11:41 PM
Hi,

Indeed my website is off at night because I host it on my NAS server and I want it off when the sun is not up... Sorry. Besides today I am away from home and I notice I can t access my site, I think I left it on the internal IP address after I did a clen up yesterday.... Shouldn t drink before I play with me server, even if it's French, red, 1995 and golden medal.... Serves me right!

I'll put this back on tonight when I arrive at 7Pm, in the meantime it might come back on theexternal IP but not sure, I'll have to study that.


When using the navitron Tube for boiling water, can you tell me exactly the one to choose (glass only or complete?)

Cheers,

Stef


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on April 12, 2009, 08:29:32 PM
20:30 Sunday PM all should be in order now...

Stef


Title: About Trackers...
Post by: sjaglin on April 13, 2009, 07:37:30 PM
About Trackers...

In order to boil water and cook some nice organic charlotte potatoes, I kept moving the cooker towards the sun... So I was thinking about making a tracker.

This morning the sun was out, great weather for the day, But I had to work... Nevermind, I did leave the cooker in the garden, facing sun with 4 big potatoes in it. I left at 9:30, the cooker was then in the sun but in the right direction (SOuth) for later in the day.

I came back at 5:00 and the potatoes are cooked, just right, not dry nor crunchy, just right.


So I will leave the tracker for now and just put the cooker at the right place and leave it all day...

Stef.


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on April 14, 2009, 12:30:22 AM
The beauty of the solar tubes is that they don't need a tracker, and work well in overcast conditions from April-September. Although your oven is capable of higher temperatures if it is tracked, and if it isn't overcast.

You need only the glass tube. You don't want the complete unit (which has copper heatpipe). There's also a cork stopper with a small hole for steam and a metal spring clip available....although I'm not sure if they're on the website.

The 47mm glass tube holds approx 1.4litres of water and the 58mm tube holds either 2.2 or 2.6litres (I think it's the latter).


Title: Re: Anyone tried adding a reflector?
Post by: sjaglin on April 14, 2009, 08:47:38 AM
Excellent, I'll wait for pay day and get a bigger one, might as well...

Thanks Ivan!

Stef


Title: Re: Anyone tried adding a reflector?
Post by: Greenbeast on June 01, 2009, 11:05:45 AM
i really like the idea of preheating my evening cooking water by using a tube.

can i remove the heat pipe from a standard tube?
I'm just about to finish up a 36 tube system, which should more than provide during summer (i've gone for antman CH Heat Dump)
But it might be that i could remove a tube or two to use to preheat cooking water during summer and also benefit the overheating situation in the solar system.


Title: Re: Anyone tried adding a reflector?
Post by: Ivan on June 02, 2009, 12:36:14 AM
Yes, just remove the heatpipe and the aluminium bits, and store them somewhere safe.

We use ours almost every day between March and September. Not only are you saving energy (0.15kWh each time you use it, and that's before you count the wasted heat in heating a kettle full of water you don't need or use), but you have instantly available hot water - which can shave 10minutes off cooking time as you don't have to wait for the water to come to the boil. Watch out on sunny days, if it's left to its own devices for several hours, it can boil half the water away.

In my head, I have a plan for a solar pan....take a normal pan and insulate it (not sure how to achieve that); the base of the pan has, say 4 heatpipe ports brazed into it, so it's heated using 4 solar tubes.


Title: Re: Anyone tried adding a reflector?
Post by: martin W on June 12, 2009, 07:35:53 PM
how about  a sort of water boat and put the normal pan in that to cook the food (you could then super insulated the boat, use the hot water as a transfer medium, plus it would mean you can use and normal pan/ caserole dish and it would be very easy to removed cood food from in that way.

You could posibly do away with the copper heat pipe all together, although I am not sure how you could get it to seal to the boat? Maybe some 120° downpipe tube silicone sealanted to the top of the tube and bottom of the boat that way you could then angle the tube at 60°?