Table nest necessary

bigalsworth · March 2017

minniemoh said:

SaintJohnsEgger said:

putting the stone in is not task that I'm anxious to attempt.

Two buddies, a six pack, and two minutes. Done deal.

but thats two minutes of work you will never get back

bigalsworth · March 2017

Well the dealer didn't get the table nest so I went with a much better and cheaper option. 1" kiln post, $10.

HeavyG · March 2017

I'd also use the kiln posts or planter pot feet over the metal nest. Much cheaper and rust free.

SMITTYtheSMOKER · March 2017

The ceramic feet were known to cause "pressure point" cracks in the bottom of the Eggs over time. Simple table nest is a wise investment. This item is easily shipped, I am sure you can find a dealer willing to ship you one.
Sorry, we do not ship though.

HeavyG · April 2017

SMITTYtheSMOKER said:

The ceramic feet were known to cause "pressure point" cracks in the bottom of the Eggs over time. Simple table nest is a wise investment. This item is easily shipped, I am sure you can find a dealer willing to ship you one.
Sorry, we do not ship though.

A table nest really doesn't carry/distribute the weight of an Egg any differently than four feet.

The nest does seem to be easier to use tho than trying to position 4 separate supports.

bigalsworth · April 2017

SMITTYtheSMOKER said:

The ceramic feet were known to cause "pressure point" cracks in the bottom of the Eggs over time. Simple table nest is a wise investment. This item is easily shipped, I am sure you can find a dealer willing to ship you one.
Sorry, we do not ship though.

i live in Canada and it will cost me a mint plus months of waiting because dealers only order 1-2 times a year, and since all of them have made their spring order I will have to wait until November or December to see if they will even be putting in another one.

Thanks for the tip though, I may look at adding a couple more to distribute the weight.

Spaightlabs · April 2017

bigalsworth said:

Well the dealer didn't get the table nest so I went with a much better and cheaper option. 1" kiln post, $10.

@bigalsworth - looks like your paver block is ready to go?

I had a 3/4 inch air gap, wasn't enough...paver cracked, table burned, house burned.

I think the amount of larger pieces of burning lump that fell through the high que grate onto the bottom of the egg may have had something to do with my fire. The bottom of my egg was not cracked at all, even post fire and table collapse.

SemolinaPilchard · April 2017

SMITTYtheSMOKER said:

The ceramic feet were known to cause "pressure point" cracks in the bottom of the Eggs over time. Simple table nest is a wise investment. This item is easily shipped, I am sure you can find a dealer willing to ship you one.
Sorry, we do not ship though.

I agree that with the ceramic feet there are pressure points, but the nest touches the egg with about the same area as the feet.
Who makes this contraption? In this pic it is upside down.
Image result for green egg table nest

Carolina Q · April 2017

SemolinaPilchard said:

SMITTYtheSMOKER said:

The ceramic feet were known to cause "pressure point" cracks in the bottom of the Eggs over time. Simple table nest is a wise investment. This item is easily shipped, I am sure you can find a dealer willing to ship you one.
Sorry, we do not ship though.

I agree that with the ceramic feet there are pressure points, but the nest touches the egg with about the same area as the feet.
Who makes this contraption? In this pic it is upside down.

https://smokeware.com/collections/grill-accessories/products/table-nest

bigalsworth · April 2017

Spaightlabs said:

bigalsworth said:

Well the dealer didn't get the table nest so I went with a much better and cheaper option. 1" kiln post, $10.

@bigalsworth - looks like your paver block is ready to go?

I had a 3/4 inch air gap, wasn't enough...paver cracked, table burned, house burned.

I think the amount of larger pieces of burning lump that fell through the high que grate onto the bottom of the egg may have had something to do with my fire. The bottom of my egg was not cracked at all, even post fire and table collapse.

yeah my paver is already cracked. These are 1" kiln posts, I will use a temp gun and measure the temp of the paver below next time I spark it up and see what it says. I also think you are correct on the lump falling through the high que, I have an expanded metal crate on the bottom and there is way more hot charcoal down there than I had with the stock grate. More fuel to burn down there, hotter it will be.

I should maybe think about using my stock grate when doing low 'n slows because I have a fan pushing in air any way.

nolaegghead · April 2017

bigalsworth said:

jtcBoynton said:

Remember that the thermal conductivity for a paver is an order of magnitude higher than air. Granite and tile are an additional order of magnitude higher.

An air gap being an insulator is a bit of a misnomer, the insulating value of air is worthless because it is not confined with no movement. The air acts like a coolant in this case, taking heat and carrying it away. It is not insulating, it is cooling. I realize some will say that is just splitting hairs but it is actually what is happening.

The effect of a material upon heat transfer rates is often expressed in terms of a number known as the thermal conductivity. Thermal conductivity values are numerical values that are determined by experiment. The higher that the value is for a particular material, the more rapidly that heat will be transferred through that material. Materials with relatively high thermal conductivities are referred to as thermal conductors. Materials with relatively low thermal conductivity values are referred to as thermal insulators. The table below lists thermal conductivity values (k) for a variety of materials, in units of W/m/°C. Material k Material k Aluminum (s) 237 Sand (s) 0.06 Brass (s) 110 Cellulose (s) 0.039 Copper (s) 398 Glass wool (s) 0.040 Gold (s) 315 Cotton wool (s) 0.029 Cast Iron (s) 55 Sheep's wool (s) 0.038 Lead (s) 35.2 Cellulose (s) 0.039 Silver (s) 427 Expanded Polystyrene (s) 0.03 Zinc (s) 113 Wood (s) 0.13 Polyethylene (HDPE) (s) 0.5 Acetone (l) 0.16 Polyvinyl chloride (PVC) (s) 0.19 Water (l) 0.58 Dense Brick (s) 1.6 Air (g) 0.024 Concrete (Low Density) (s) 0.2 Argon (g) 0.016 Concrete (High Density) (s) 1.5 Helium (g) 0.142 Ice (s) 2.18 Oxygen (g) 0.024 Porcelain (s) 1.05 Nitrogen (g) 0.024 Source: http://www.roymech.co.uk/Related/Thermos/Thermos_HeatTransfer.html

bigalsworth · April 2017

nolaegghead said:

bigalsworth said:

jtcBoynton said:

Remember that the thermal conductivity for a paver is an order of magnitude higher than air. Granite and tile are an additional order of magnitude higher.

An air gap being an insulator is a bit of a misnomer, the insulating value of air is worthless because it is not confined with no movement. The air acts like a coolant in this case, taking heat and carrying it away. It is not insulating, it is cooling. I realize some will say that is just splitting hairs but it is actually what is happening.

The effect of a material upon heat transfer rates is often expressed in terms of a number known as the thermal conductivity. Thermal conductivity values are numerical values that are determined by experiment. The higher that the value is for a particular material, the more rapidly that heat will be transferred through that material. Materials with relatively high thermal conductivities are referred to as thermal conductors. Materials with relatively low thermal conductivity values are referred to as thermal insulators. The table below lists thermal conductivity values (k) for a variety of materials, in units of W/m/°C.

Material

k

Material

k

Aluminum (s)

237

Sand (s)

0.06

Brass (s)

110

Cellulose (s)

0.039

Copper (s)

398

Glass wool (s)

0.040

Gold (s)

315

Cotton wool (s)

0.029

Cast Iron (s)

55

Sheep's wool (s)

0.038

Lead (s)

35.2

Cellulose (s)

0.039

Silver (s)

427

Expanded Polystyrene (s)

0.03

Zinc (s)

113

Wood (s)

0.13

Polyethylene (HDPE) (s)

0.5

Acetone (l)

0.16

Polyvinyl chloride (PVC) (s)

0.19

Water (l)

0.58

Dense Brick (s)

1.6

Air (g)

0.024

Concrete (Low Density) (s)

0.2

Argon (g)

0.016

Concrete (High Density) (s)

1.5

Helium (g)

0.142

Ice (s)

2.18

Oxygen (g)

0.024

Porcelain (s)

1.05

Nitrogen (g)

0.024

Source: http://www.roymech.co.uk/Related/Thermos/Thermos_HeatTransfer.html

Yes air has an insulating value but is only an insulator if it is trapped, which means in this case it is more like a fluid which carries heat away not an insulator. Think of everything that is air cooled, engines etc, if open air was a insulator nothing could be air cooled.

And I don't even need to copy and paste this from Google.

nolaegghead · April 2017

bigalsworth said:

nolaegghead said:

bigalsworth said:

jtcBoynton said:

Remember that the thermal conductivity for a paver is an order of magnitude higher than air. Granite and tile are an additional order of magnitude higher.

An air gap being an insulator is a bit of a misnomer, the insulating value of air is worthless because it is not confined with no movement. The air acts like a coolant in this case, taking heat and carrying it away. It is not insulating, it is cooling. I realize some will say that is just splitting hairs but it is actually what is happening.

The effect of a material upon heat transfer rates is often expressed in terms of a number known as the thermal conductivity. Thermal conductivity values are numerical values that are determined by experiment. The higher that the value is for a particular material, the more rapidly that heat will be transferred through that material. Materials with relatively high thermal conductivities are referred to as thermal conductors. Materials with relatively low thermal conductivity values are referred to as thermal insulators. The table below lists thermal conductivity values (k) for a variety of materials, in units of W/m/°C.

Material

k

Material

k

Aluminum (s)

237

Sand (s)

0.06

Brass (s)

110

Cellulose (s)

0.039

Copper (s)

398

Glass wool (s)

0.040

Gold (s)

315

Cotton wool (s)

0.029

Cast Iron (s)

55

Sheep's wool (s)

0.038

Lead (s)

35.2

Cellulose (s)

0.039

Silver (s)

427

Expanded Polystyrene (s)

0.03

Zinc (s)

113

Wood (s)

0.13

Polyethylene (HDPE) (s)

0.5

Acetone (l)

0.16

Polyvinyl chloride (PVC) (s)

0.19

Water (l)

0.58

Dense Brick (s)

1.6

Air (g)

0.024

Concrete (Low Density) (s)

0.2

Argon (g)

0.016

Concrete (High Density) (s)

1.5

Helium (g)

0.142

Ice (s)

2.18

Oxygen (g)

0.024

Porcelain (s)

1.05

Nitrogen (g)

0.024

Source: http://www.roymech.co.uk/Related/Thermos/Thermos_HeatTransfer.html

Yes air has an insulating value but is only an insulator if it is trapped, which means in this case it is more like a fluid which carries heat away not an insulator. Think of everything that is air cooled, engines etc, if open air was a insulator nothing could be air cooled.

And I don't even need to copy and paste this from Google.

(note, giant and unnecessary quote I made above)

I completely agree with you.

Also, absent that trapped environment, air is the worst at removing heat. This is why most engines are water cooled. Also, note how cast iron is crappy at transferring heat. You put a cast iron pan on a small burner, and it doesn't heat evenly. All kinds of inferences can be made from that data. It rocks.

bigalsworth · April 2017

Yup some engines are water cooled, but what cools the water I wonder?

Point with quote well taken.

nolaegghead · April 2017

bigalsworth said:

Yup some engines are water cooled, but what cools the water I wonder?

Point with quote well taken.

I'm a motor-head. We live in a world of air. Moving vehicles on land only have air to cool. Boats use water (superior). Power plants use evaporation or a lake.

Soooo....the water coolant is leveraged to the magic formula: massive surface area and air flow - aka "radiator".

What was the original question?

bigalsworth · April 2017

I completely agree. I have worked in a few plants that used aerial coolers to cool condensate instead of water, but they were small, like 20MW units. I guess I better find a way to run water through the base of my egg, or at the very least put a fan there with some water misting.

nolaegghead · April 2017

The air gap is important. But you should see the charring where radiant heat beat that gap and toasted my table. I'll take a pic at some point. You really want an air gap (solves the convection issue) and a radiant barrier. IR heat will cause a fire.

I have an air gap and a radiant barrier. No more problems. Piece of aluminum foil will work in a pinch. Now, we're talking nuclear pizza temps. 99.9% of what people do on their eggs, the air gap is good 'nuf.

nolaegghead · April 2017

Oh, and I meant to give you some dystopian fiction book recommendations. I'll get you a list when I get a chance. Cheers!

bigalsworth · April 2017

I will look for some low emissivity spray paint or something of the sort. Looking forward to the list.

After a short search for low emissivity paint I think I will just go with aluminum foil, cheap and easily replaceable

thetrim · April 2017

I'd buy the green ceramic feet, if they ever brought them back.

RRP · April 2017

thetrim said:

I'd buy the green ceramic feet, if they ever brought them back.

They used to appear on eBay from time to time. Then back in 2014 the GA Mountain Fest gave these away. Guess the didn't want to risk stepping on BGE corporate toes! hehehe

Table nest necessary

Comments

Categories

Material	k	Material	k
Aluminum (s)	237	Sand (s)	0.06
Brass (s)	110	Cellulose (s)	0.039
Copper (s)	398	Glass wool (s)	0.040
Gold (s)	315	Cotton wool (s)	0.029
Cast Iron (s)	55	Sheep's wool (s)	0.038
Lead (s)	35.2	Cellulose (s)	0.039
Silver (s)	427	Expanded Polystyrene (s)	0.03
Zinc (s)	113	Wood (s)	0.13
Polyethylene (HDPE) (s)	0.5	Acetone (l)	0.16
Polyvinyl chloride (PVC) (s)	0.19	Water (l)	0.58
Dense Brick (s)	1.6	Air (g)	0.024
Concrete (Low Density) (s)	0.2	Argon (g)	0.016
Concrete (High Density) (s)	1.5	Helium (g)	0.142
Ice (s)	2.18	Oxygen (g)	0.024
Porcelain (s)	1.05	Nitrogen (g)	0.024