Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
Call Ambulance,
Rebuild Kitchen.

idea: add, search, annotate, link, view, overview, recent, by name, random

meta: news, help, about, links, report a problem

account: browse anonymously, or get an account and write.



Coconut Oil Wall Insulation

May not suit all climates
  [vote for,

Coconut oil melts at 24 deg C (76 deg F). This makes it the perfect material for filling cavity walls, to provide a brief respite from the heat during the peak of a heatwave.
Wrongfellow, Jul 15 2017


       Oh...kay ....   

       So most of the time, the coconut oil will be a near-solid, with a fairly high U value - thus reducing the tendency of heat to enter or leave the building.   

       Presuming the inside temperature never exceeds 23 C and it's hotter inside than outside, all well and good - apart from the fact that your walls are filled with a flammable wax-like solid with a low melting point.   

       But when the outside temperature rises above 24 C, the solid starts to soften, and eventually liquifies, allowing convection to transfer heat from the hotter outside to the cooler inside.   

       So unless your system has some subtle way of reversing the Second Law of Thermodynamics, it doesn't seem a very good way of keeping a building cool ...
8th of 7, Jul 15 2017

       I think the theory was that the wall filling would absorb latent heat at 24°C.
MaxwellBuchanan, Jul 15 2017

       That is correct. However, since coconut oil seems to be a eutectic mixture of short-chain lipids with a poorly-defined melting point, and a specific heat capacity a lot less than water, the benefits are not obvious - unless you have an overwhelming compulsion to have your home smell like the inside of a coconut.
8th of 7, Jul 15 2017

       Perhaps [Wrongfellow] has made a heavy but ill-judged investment in the Asian Coconut Oil Lake, and is seeking ways to recoup his losses.
MaxwellBuchanan, Jul 15 2017

       The obvious answer would be to fill the wall cavities with a non-flammable insulation such as rockwool or fibreglass, and use the coconut oil as the fuel in a small diesel engine directly coupled to an air conditioning compressor.   

       If it's warm enough to require the arcon, then some of the oil will be fluid, and waste heat from the engine can be used to melt the rest in the feed tank.
8th of 7, Jul 15 2017

       Latent heat of fusion for coconut oil is 249 J/g. Specific heat for water is 4.2 J/g/deg C. So the heat storage over the small melting range of coconut oil could only be provided by the same mass of water if the water temperature changed by 59 deg C. The melting point of coconut oil may be poorly defined, but it's a good bet you'll store a heck of a lot more heat in coconut oil between 20 and 28 deg C than you would with water.   

       That being said, you don't want to fill the walls. You want to thermally couple the coconut oil to the interior of a well insulated house   

       Of course when I googled "latent heat of fusion of coconut oil" the first link was to research on using coconut oil for this very purpose.
scad mientist, Jul 16 2017

       Great to see that it's in the oven!   

       Why are people comparing coconut oil to water? I don't see how water is relevant. Filling your cavity walls with water sounds like a recipe for disaster.
Wrongfellow, Jul 16 2017

       //Filling your cavity walls with water sounds like a recipe for disaster//   

       Not in a tower fire.
wjt, Jul 16 2017

       Yes, but that's not much of a choice - being grilled, deep fried, or poached ...
8th of 7, Jul 16 2017

       <Kenneth Williams>   

       "Frying tonight ! "   

       </Kenneth Williams>
8th of 7, Jul 16 2017


back: main index

business  computer  culture  fashion  food  halfbakery  home  other  product  public  science  sport  vehicle