I don't know but I wouldn't preheat the oven...
So does ours but I think that is heat that has transfered to the microwave from the cooking food via steam in the exhaust air and the waste heat from the magnetron.
In message , PeterC writes
Used on of those travel kettles that plugs into the car once, took about
15 minutes to boil or something equally silly :-)
I might well not preheat the oven, but I was trying to keep it simple.
Re-state:
Cost of heating oven to temperature plus keeping it hot for (45 mins. less the time taking for it to get to temperature).
(And if the 'keeping it hot' cost is marginal, preheat or no preheat wouldn't end up making much difference. I quite often turn the oven down before end of cooking - it has a fan so 'off' is not ideal.)
Wherever the heat in the microwave comes from (food, steam, absorbed microwaves, power supply inefficiency, etc.), it costs in terms of electric power input. What we want, at the end of cooking, is a hot potato and a cold oven. Shame we haven't managed that yet! (Maybe a super-duper ground source heat pump could take heat from spuds outside and put it into a single spud inside? :-) )
Oh yes we have!....it was used in WWII and was known as a 'Victory Cooker'.
The casserole was brought up to cooking temperature, then placed in a cardboard box stuffed with straw and covered over. Forty-five minutes later, the hot, cooked dish was served and eaten.
I cook rice in a very similar fashion, by bringing the water to the boil, adding the rice, and turning the heat off. Eleven minutes later...perfect rice. I can give the exact method if anyone is interested.
Perhaps we should look backwards in time for energy-saving techniques!
I first came across this phenomenon about 25 years ago, when I was doing process control for KP. We converted crisp weighing machines from manual controls to computerised. The operators didn't realise that the controls on the machines were disconnected, and continued to use them, remaining utterly convinced that they still worked. We didn't shatter their illusions, since it kept them happy...
Indeed. An aga has zero opportunity cost for cooking. As has any range type stove with a hot plate.
Another good one, is to tack a metal bottle of water to your exhaust manifold. Instant coffee when you stop.
If your hose is thermostatically controlled, and electrical waste heat only reduces CH bills anyway If its being heated at all...
Douwe Egberts is OK. And their instant decaff is the only one I've ever come across that tastes the same as the "full fat" version.
You've obviously never seen the state of my wife's hands if she handles some washing powders.
I can't see any point in decaffeinated coffee.
It's a bit like alcohol-free beer. (well, it isn't, BYKWIM).
One family member works in a hospital, and almost certainly due to frequently using alcohol hand wipes, she finds she can't handle detergents anymore. She can't even go near a decent washing up liquid and has to use one of the eco-doesn't-actually-dissolve-any-grease ones.
I have one and use it, sits wedged in a box in the passenger foot well, plug it in just under 20 miles from where I want to stop. It's mug full of water is nicely hot by the time I arrive. Draws about 10A@12v so about
120W.Terry Fields posted
This reminds me of a field technique that used to be taught in the Army, called the "Maori oven". You dig a hole, line the bottom with large stones, and cover it with firewood. Light the fire and let it burn out. Wrap your edibles - typically gutted rabbit or deer - in clay and dump them on the hot stones. Cover in the pit with more stones, or earth and sand if necessary. Wait two hours and the rabbits are perfectly cooked.
You can use petrol if there's no wood :)
The same method appears in Ken Hom's chinese cookbook.
Which alcohol? Ethanol or isopropanol?
I fell across an article the other day blaming erythromelalgia on isopropanol (IIRC, in a carpet cleaning product).
Whatever is on the NHS alcohol hand wipes (I don't know).
If you have a pointer to the article, that would be interesting.
Thought that before I posted - but initially couldn't find it. But slight change in search terms and voila!
Vet Hum Toxicol. 2004 Feb;46(1):24-5.
Acute neuropathy and erythromelalgia following topical exposure to isopropanol. Rajabally YA, Mortimer NJ.
Department of Neurology, University Hospitals of Leicester, Royal Infirmary, Leicester, United Kingdom.
Adverse effects resulting from topical exposure to isopropanol appears exceptional in adults with intact skin. We describe the case of a young woman who developed an acute sensori-motor axonal polyneuropathy after walking bare-feet for several hours on carpets soaked by a disinfectant containing isopropanolol. The persistence and severity of symptoms raised the possibility of her neuropathy being partly related to immunizations she received 1 mo earlier. The occurrence shortly after contact, however, strongly suggested responsibility of the dermal isopropanol exposure. This case being, to our knowledge, the second reported, peripheral nerve toxicity appears possible in adults on prolonged topical exposure, probably in susceptible individuals.
Erythromelalgia is usually regarded as a rare skin/vascular problem (around 32.5 to 10 in a million). Alcohol consumption (ethanol) is often a problem for sufferers.
If you're familiar with your microwave you set the time so as to deliver at drinking temperature. More energy efficient than leaving a kettle to boil and waiting for your black coffee to cool down
Open box. Prick packaging and stand well clear ;). My dad told me they were issued with self-heating tins of food after the D day landings. Always curious how they worked.
Reminds me of the Anthony Worrell Thompson sausages, complete with a picture of the chef, with the caption "prick with a fork".
Sensitivity to alcohol wipes is more common than many think and often ignored by administrators and infection control specialists. I have a family member working in a hospital who has problems with the alcohol hand wipes but in this case they cause eczema. She's stopped using them and now only uses soap, massively less convenient when treating patients but she really has no other option.
I'm impressed that s/he actually treats patients instead of canting to other staff about holidays etc. I firmly believe that nursing is now just a job/when can I get out of here/roll on end of shift. My 93 year old Mom is currently in an assessment ward to see what she needs when she comes home. She can't go to the loo - i'll get some orange juice - orange juice never materialises. She needs some tissues - i'll get her some - never appears etc etc etc. And when you tell a nurse that she needs to use the loo, looks could kill. You daren't complain for fear of even worse/less treatment.
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