Navitron Renewable Energy and Sustainability Forum

SOLAR THERMAL => Solar Cooking (using vacuum tubes or more conventional methods) => Topic started by: Mike N. on October 14, 2007, 05:14:52 PM



Title: Solar boiled egg and toast in mid-October!
Post by: Mike N. on October 14, 2007, 05:14:52 PM
Lyrica finally produced a suitable egg on a suitable day. Note the useful flat bottom which stops it rolling around.

(http://geraintnorth.com/egg/Egg01.JPG)


Test to confirm that the soft shell will allow the egg to be inserted into the tube. Note the assembled materials - greaseproof paper, waste pipe as former and tube (Sticky back plastic not required ;D).

(http://geraintnorth.com/egg/Egg02.JPG)


Roll greaseproof paper around former and secure with masking tape, attach masking tape tabs to hook over the top of the tube to simplify  retrieval.

(http://geraintnorth.com/egg/Egg03.JPG)


Use waste pipe to insert greaseproof sheath into tube

(http://geraintnorth.com/egg/Egg04.JPG)


Insert egg.

(http://geraintnorth.com/egg/Egg05.JPG)


Clamp tube to bench (11am) and attach anal probe to monitor progress..

(http://geraintnorth.com/egg/Egg06.JPG)


After one hour, temperature is up to 79 degrees.

(http://geraintnorth.com/egg/Egg07.JPG)



By one and a half hours it’s up to 97 degrees.

(http://geraintnorth.com/egg/Egg08.JPG)


By 2 hours it’s reached 102 degrees – not bad for mid October.

(http://geraintnorth.com/egg/Egg09.JPG)


Note the singed greaseproof paper.

(http://geraintnorth.com/egg/Egg10.JPG)

Not the most attractive egg – note the groove from the thermocouple.
(http://geraintnorth.com/egg/Egg11.JPG)


Let’s try some toast to go with it – one piece kept as a control for colour matching purposes.

(http://geraintnorth.com/egg/Egg12.JPG)


Toast done – more hot dried bread actually, though with the eye of faith you can imagine that it’s just a touch browner than the control piece  The egg is a bit more difficult to peel with a membrane and not the conventional shell.

(http://geraintnorth.com/egg/Egg13.JPG)


It looks slightly more appetising once sliced .

(http://geraintnorth.com/egg/Egg14.JPG)


And it tastes like….
… any other hard boiled egg on warm dry bread. (Apart from the required warm glow from knowing it didn’t consume any power etc, which it is mandatory to mention in this forum).

Incidentally the tree over my right shoulder looked as though it might shade the tubes in the early mornings in winter. Note the past tense – I find chain saws so very addictive – once you start…

(http://geraintnorth.com/egg/Egg15.JPG)


Mike


Title: Re: Solar boiled egg and toast in mid-October!
Post by: martin on October 14, 2007, 05:27:39 PM
an eggciting eggsperiment! ;D


Title: Re: Solar boiled egg and toast in mid-October!
Post by: stephen on October 14, 2007, 07:45:32 PM
What type of egg did you use. the shell looks squishy ???

Stephen


Title: Re: Solar boiled egg and toast in mid-October!
Post by: Mike N. on October 14, 2007, 10:10:47 PM
What type of egg did you use. the shell looks squishy ???
Stephen

Explained in a previous thread when Geoff did scrambled egg:    http://navitron.org.uk/forum/index.php?topic=1710.msg12462#msg12462

Mike


Title: Re: Solar boiled egg and toast in mid-October!
Post by: Ivan on October 17, 2007, 01:38:51 AM
Fantastic! I was just thinking that someone ought to try some winter solar cooking to prove it can be done. It's all the more impressive when it's done in October!