Miracle ThawBoard Food Defrosting Tray £5 Robert Dyas
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Miracle ThawBoard Food Defrosting Tray £5 Robert Dyas

£5£11.9958%Robert Dyas Deals
30
Found 23rd Jul
I know its warm and food defrosts pretty well in this weather...but it’ll soon be Christmas.

The reviews are raving, so I just ordered one to see how good it is. Was £12.99, then £9.99 and now £5. They appear to be around £20 everywhere and Amazon’s cheapest version is still £11.99.

I also got a unidays code so got it for £4.50, and going by the reviews it should be worth every penny.
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'Absorbs natural heat energy from the air and releases it directly into your food'??? What utter and complete garbage. A black surface will be better at absorbing electromagnetic radiation but the amount of that from kitchen lighting will be minimal. Why would heat energy flow preferentially into a tray then into the material being defrosted rather than direct from the air? The thermal conductance of the aluminium is irrelevant, it is the thermal conductance of the material being defrosted that dictates defrost time. The Zeroth Law of Thermodynamics is obviously not a strong point of blurb writers
31 Comments
'Absorbs natural heat energy from the air and releases it directly into your food'??? What utter and complete garbage. A black surface will be better at absorbing electromagnetic radiation but the amount of that from kitchen lighting will be minimal. Why would heat energy flow preferentially into a tray then into the material being defrosted rather than direct from the air? The thermal conductance of the aluminium is irrelevant, it is the thermal conductance of the material being defrosted that dictates defrost time. The Zeroth Law of Thermodynamics is obviously not a strong point of blurb writers
We bought a similar one a few years ago and they do indeed work.However ours ended up in the bin as the coating peels off leaving it on the food or where you store it.Not sure what the coating is on this one.
dogpatch1 h, 10 m ago

'Absorbs natural heat energy from the air and releases it directly into …'Absorbs natural heat energy from the air and releases it directly into your food'??? What utter and complete garbage. A black surface will be better at absorbing electromagnetic radiation but the amount of that from kitchen lighting will be minimal. Why would heat energy flow preferentially into a tray then into the material being defrosted rather than direct from the air? The thermal conductance of the aluminium is irrelevant, it is the thermal conductance of the material being defrosted that dictates defrost time. The Zeroth Law of Thermodynamics is obviously not a strong point of blurb writers



Think you're missing a trick here... It's an alu heat sink.

Surface area comes into play where you want to equalise the temperature between room and frozen item (I expect this board to be large).

Thermo conductivity medium is the ice/water (from the food which has been in the freezer). Of which where this "magic" happens.

Radiation absorption of a black body object is higher than relative items you till find from the kitchen,especially when it is none reflective. Obviously leaving it near the sun is preferred but that's probably not required.

However we are only talking a few degrees difference max, maybe that's all it needs to make a difference?


Edit: Realistically you can just use a high quality baking tray.. We bought some "taste the difference" heavy duty from sainsburys a while ago when it was on sale. These I'd assume would work to same/similar effect.
Edited by: "Inquisitor" 23rd Jul
What a ridiculous item.
BTW, check out the fakes reviews (all 5 stars!!) on the Internet via the Robert Dyas link. June 9 was a busy day for review writers :o.
eatmorefish12 m ago

What a ridiculous item. BTW, check out the fakes reviews (all 5 stars!!) …What a ridiculous item. BTW, check out the fakes reviews (all 5 stars!!) on the Internet via the Robert Dyas link. June 9 was a busy day for review writers :o.


Not just 9 June, most of the reviews seem to be in batches then with significant good between them. Very much looks like fake reviews to me!
Inquisitor1 h, 29 m ago

Think you're missing a trick here... It's an alu heat sink.Surface area …Think you're missing a trick here... It's an alu heat sink.Surface area comes into play where you want to equalise the temperature between room and frozen item (I expect this board to be large). Thermo conductivity medium is the ice/water (from the food which has been in the freezer). Of which where this "magic" happens. Radiation absorption of a black body object is higher than relative items you till find from the kitchen,especially when it is none reflective. Obviously leaving it near the sun is preferred but that's probably not required. However we are only talking a few degrees difference max, maybe that's all it needs to make a difference?Edit: Realistically you can just use a high quality baking tray.. We bought some "taste the difference" heavy duty from sainsburys a while ago when it was on sale. These I'd assume would work to same/similar effect.


Or a scolville pan, heavy aluminium base nearly black, no meat juices everywhere.
Edited by: "gazdoubleu" 23rd Jul
My sister experimented with one of these, back when they first came out through Kleeneze, 10-15 years ago; the difference between sticking them on this, or sticking them on a plate was minimal, and as noted, a baking tray works just as well.

99.99% of people needing to defrost something are going to use the microwave, and the 0.01% without a microwave are going to use a bowl/sink filled with tepid water.
thaliar19 m ago

I would never defrost chicken in the microwave by the way! …I would never defrost chicken in the microwave by the way! http://www.dailymail.co.uk/femail/food/article-5227949/Why-NEVER-defrost-meat-microwave.html


Should be fine if cooking straight away which is generally the idea when you want to defrost raw meat quickly.
Miracle? No wonder I'm a non-believer !!
Gentle_Giant39 m ago

99.99% of people needing to defrost something are going to use the …99.99% of people needing to defrost something are going to use the microwave, and the 0.01% without a microwave are going to use a bowl/sink filled with tepid water.


I don't know, going by the description the OP has i think they defrost their food in the sun?
Just use a large, bare aluminium baking tray.
gazdoubleu1 h, 19 m ago

Or a scolville pan, heavy aluminium base nearly black, no meat juices …Or a scolville pan, heavy aluminium base nearly black, no meat juices everywhere.

Mmmm meat juices. EVERYWHERE
thaliar1 h, 19 m ago

I would never defrost chicken in the microwave by the way! …I would never defrost chicken in the microwave by the way! http://www.dailymail.co.uk/femail/food/article-5227949/Why-NEVER-defrost-meat-microwave.html


Nonsense.

I'm not sure if the Daily Mail are dressing this up for clicks or not, but the advice in the article doesn't fit with government food safety advice. Defrosting in temperatures below 5°C is preferable. But failing that, food should be defrosted as quickly as possible and cooked straight away. The microwave is simply one tool for achieving this.

What isn't a good idea is buying one of these "defrosting trays" and then leaving the food at room temperature.
Edited by: "satchef1" 23rd Jul
thaliar1 h, 18 m ago

I would never defrost chicken in the microwave by the way! …I would never defrost chicken in the microwave by the way! http://www.dailymail.co.uk/femail/food/article-5227949/Why-NEVER-defrost-meat-microwave.html



NEVER quote the Daily Fail if you want to be taken seriously; they are well below Wiki on the believability scale, and only slightly above Pravda or Fox News.

(The believability score of Fox News jumped 200 points after they accidentally made the "Two Dictators" comment recently)
dogpatch3 h, 32 m ago

'Absorbs natural heat energy from the air and releases it directly into …'Absorbs natural heat energy from the air and releases it directly into your food'??? What utter and complete garbage. A black surface will be better at absorbing electromagnetic radiation but the amount of that from kitchen lighting will be minimal. Why would heat energy flow preferentially into a tray then into the material being defrosted rather than direct from the air? The thermal conductance of the aluminium is irrelevant, it is the thermal conductance of the material being defrosted that dictates defrost time. The Zeroth Law of Thermodynamics is obviously not a strong point of blurb writers



but it looks pretty tho. don't forget that...
Loving all the thermodynamic engineers here
mrtrana36 m ago

Loving all the thermodynamic engineers here


I am quietly hoping the person who commented first wasn't studying Thermodynamics, or perhaps they may have skipped a few classes
Edited by: "Inquisitor" 23rd Jul
Thermodynamics 101
I'm willing to bet most people buying this also wear magnetised bracelets.

Seriously - just use a microwave if you are pushed for time, or defrost in the fridge overnight.
sh2013 m ago

I'm willing to bet most people buying this also wear magnetised …I'm willing to bet most people buying this also wear magnetised bracelets.Seriously - just use a microwave if you are pushed for time, or defrost in the fridge overnight.


Comparing the thermal conductivity of aluminum to magnetised bracelets? Er, sure.
Ashe13 m ago

Comparing the thermal conductivity of aluminum to magnetised bracelets? …Comparing the thermal conductivity of aluminum to magnetised bracelets? Er, sure.



But magnetised bracelets MUST work, the Daily Fail sell them all the time !!!
'Inquisitor'. Thermodynamics is included in one of the units I teach. Aluminium as a 'heat sink' is irrelevant as it can be taken to be at equilibrium to the air already ( ambient temperature ). The ONLY issue is the thermal conductance of the material not at equilibrium. If air was solid it would transfer very little heat ( particle kinetic ) energy but we can accept air movement as a given. Imagine a defrosting chicken on this thing. Air would impart heat energy to the frozen chicken, become more dense and sink to the aluminium plate tending to cool it below ambient. The thermal gradient between chicken and aluminium would actuall be less steep than between chicken and air.
dogpatch36 m ago

'Inquisitor'. Thermodynamics is included in one of the units I teach. …'Inquisitor'. Thermodynamics is included in one of the units I teach. Aluminium as a 'heat sink' is irrelevant as it can be taken to be at equilibrium to the air already ( ambient temperature ). The ONLY issue is the thermal conductance of the material not at equilibrium. If air was solid it would transfer very little heat ( particle kinetic ) energy but we can accept air movement as a given. Imagine a defrosting chicken on this thing. Air would impart heat energy to the frozen chicken, become more dense and sink to the aluminium plate tending to cool it below ambient. The thermal gradient between chicken and aluminium would actuall be less steep than between chicken and air.




W/(m. 2• K) {delta}T

You're welcome, have a good day.
Ashe1 h, 47 m ago

Comparing the thermal conductivity of aluminum to magnetised bracelets? …Comparing the thermal conductivity of aluminum to magnetised bracelets? Er, sure.


comparing the usefulness - was it not obvious?
sh205 m ago

comparing the usefulness - was it not obvious?


I would say putting something on a thermally conductive material is quite useful to defrost it.
Ashe10 m ago

I would say putting something on a thermally conductive material is quite …I would say putting something on a thermally conductive material is quite useful to defrost it.


In that context a plate covered in tinfoil is thermally conductive - but even then it would only affect the side that it's touching. Regardless, who in their right mind is defrosting things left out on the side? If you are using this in the fridge then you have removed the supposed usefulness of thermodynamics - which in this situation I would argue is a buzzword more than anything meaningful.

If you think this is a useful product then more power to you - but I certainly wouldn't want to come and eat at yours if you are defrosting things using this.
sh2014 m ago

In that context a plate covered in tinfoil is thermally conductive - but …In that context a plate covered in tinfoil is thermally conductive - but even then it would only affect the side that it's touching. Regardless, who in their right mind is defrosting things left out on the side? If you are using this in the fridge then you have removed the supposed usefulness of thermodynamics - which in this situation I would argue is a buzzword more than anything meaningful. If you think this is a useful product then more power to you - but I certainly wouldn't want to come and eat at yours if you are defrosting things using this.


Right - next time I build a PC, I won't bother with a thick aluminium heatsink, I'll just use a block of something covered with tinfoil...
Edited by: "Ashe" 23rd Jul
Ashe3 m ago

Right - next time I build a PC, I won't bother with a thick aluminium …Right - next time I build a PC, I won't bother with a thick aluminium heatsink, I'll just use a block of something covered with tinfoil...


And in that context, I wish you luck sir
sh2011 m ago

And in that context, I wish you luck sir



It's the same concept here.
In laymen terms, you need a certain amount of thickness so that the heat transfer works efficiently. Having a tin foil will only have a small area before it has no effect. This is because travelling across the foil will make it harder work than traveling through a thick slab of metal. Eg foil may not feel "cold to touch" however a metal block will always feel cold (higher thermal efficiency).

Another example which is more cooking orientated. A cast iron/professional pan is much easier to control heat than a tesco value one because the quality one retains its temperature longer.


Question: what's wrong with leaving things to thaw on the side? I do it daily... So long as its cooked properly and fresh it's Ok?
Edited by: "Inquisitor" 23rd Jul
I understand basic thermodynamics. That’s my point, this device has such a small amount of thermodynamics at work it will not make a difference.

If you haven’t had an issue then perhaps it’s fine. I have always read you are at higher risk of food poisoning by leaving it out. By the time the core is defrosted the outer ‘layer’ has spent considerable time in the danger zone.
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