Diy portable 18650 tea maker

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Jason Morris

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Dec 24, 2017
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It works.
image_goqojc.jpg

image_obuiyo.jpg

The water gets hot but doesnt boil
 

completelycharged

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Mar 7, 2018
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Great.... like it. Insulate it and leave to simmer for nearly an hour and it might get to boiling point. Tea like tar,

4.2 Joules / cm3
150 cc Cup of critical tea making liquid
15 C Starting temperature
99 C Target temperature
84 C rise in temp required
630 Joules needed per C rise
52920 Joules needed to reach critical tea point
7.2 V pack
2.3 Amps
16.56 Joules / second
38 Seconds per C rise in temp
3196 Seconds to boil
14.7 Wh energy needed from the pack
 

Jason Morris

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Dec 24, 2017
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Lol. I was just messing around. Pieces of the resistor flake off making it not really drinkable
 

completelycharged

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Toxic tea... the electrolysis products from the cables would be a slight issue as well.
 

Korishan

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Drinking this special tea will make you resistive to most illnesses :p
 

Geek

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Korishan said:
Drinking this special tea will make you resistive to most illnesses :p

Who could resist a nice cup of tea? :D

Just curious - does the liquid effect the resistor? I would be more inclined to use mineral oil. Motor oil often has additives that could be electrically conductive.
 

completelycharged

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Don't you know... "resistance is futile" ?

Engine oil has the main issue as a coollant that when it gets hot it gives off some of the low chain products and becomes very flamable.. additives are not sufficient to pose a conductive issue. Mineral oil is used in HV transformers for cooling.

I have wondered is a plasma arc could be used as a quick boil and clensing of the waters...
 

Geek

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completelycharged said:
Don't you know... "resistance is futile" ?

Engine oil has the main issue as a coollant that when it gets hot it gives off some of the low chain products and becomes very flamable.. additives are not sufficient to pose a conductive issue. Mineral oil is used in HV transformers for cooling.

I have wondered is a plasma arc could be used as a quick boil and clensing of the waters...

Good point. Would have to make sure that the cooling solutionwould not give off flammable gasses.

My theory is that water could seep into the resistor and cause it to deteriorate over time.

That and using tea could lead to the creation of the Infinite Improbability Drive. :p
 

Riplash

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May 27, 2018
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Geek said:
completelycharged said:
Don't you know... "resistance is futile" ?

Engine oil has the main issue as a coollant that when it gets hot it gives off some of the low chain products and becomes very flamable.. additives are not sufficient to pose a conductive issue. Mineral oil is used in HV transformers for cooling.

I have wondered is a plasma arc could be used as a quick boil and clensing of the waters...

Good point. Would have to make sure that the cooling solutionwould not give off flammable gasses.

My theory is that water could seep into the resistor and cause it to deteriorate over time.

That and using tea could lead to the creation of the Infinite Improbability Drive. :p

Since the post is about making tea, why don't you use cooking oil like canola oil, olive oil, or corn oil. Oliveoil probably has lowest smoke point of 325 degrees F (approx 165 degrees C) before it may begin to smoke and the others are hotter. You could deep fry some french fries or shrimp.
 

completelycharged

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Tea and chips at the same time, sorted !!!!

If it is in oil use some nicrome wire, just make sure all of it is below the surface.. it will not oxidise and become brittle.. and chepaer and mor eadjustable than a 12V immersion element.
 

Geek

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I was thinking the other night. If water got inside a ceramic resistor, is it possible for it to boil, and cause the resistor to explode?
 

Korishan

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Geek said:
I was thinking the other night. If water got inside a ceramic resistor, is it possible for it to boil, and cause the resistor to explode?

Only one way to find out. Drill a tiny hole in the ceramic so water "can" get to the core ;) Make sure to record it!
 

Geek

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Korishan said:
Geek said:
I was thinking the other night. If water got inside a ceramic resistor, is it possible for it to boil, and cause the resistor to explode?

Only one way to find out. Drill a tiny hole in the ceramic so water "can" get to the core ;) Make sure to record it!

Uncoated ceramic is porous. Eventually water will get in!
 

completelycharged

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Leave the resistor to soak for a day to get water in and then connect it across the mains, the inside water will vapourise first causing the whole thing to shatter..
 

Korishan

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Geek said:
Uncoated ceramic is porous. Eventually water will get in!

This may be true, but the hole would make the process faster ;)

completelycharged said:
Leave the resistor to soak for a day to get water in and then connect it across the mains, the inside water will vapourise first causing the whole thing to shatter..

:thumbs up: !!! And make sure there's a camera pointed at it and recording. Preferably one that can do slo mo ;)
 

BlueSwordM

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Or just do like me and use a steel spring and connect 2 cells in series.

That makes it extremely hot.

However, if you want to go to the next levels, I would advise trying using graphite rods with a 4S pack.

Let's just say, it gets very, very hot :)
 

Riplash

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completelycharged said:
Tea and chips at the same time, sorted !!!!

If it is in oil use some nicrome wire, just make sure all of it is below the surface.. it will not oxidise and become brittle.. and chepaer and mor eadjustable than a 12V immersion element.

Now that I have my 1s x 40p test module, I have plenty of Stainless Steel T-3040.041" wire in stock, with some NiChrome on order,and Iam looking for an electrical load to test this battery, cooking tea and chips is looking like a real possibility. After I get the process down, what type of Tea do you recommend?
 

completelycharged

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Earl Gray may end up a bit off flavour with Nicrome oxides,

Good olde PG Tips (builders tea) can taste like anything as long as it looks like tea so that may be an option.

Chips, the other option for fast cooking is to wire wrap a chip and effectively make a small oven surrounding the chip, although this will increase the likelyhood of overkooking and spontanious combusion.
 

Riplash

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Cooking with second life 18650s and Stainless Steel wire is in progress....

I began work on the tea making process. I wound about 3 feet of stainless steel wire around an 18650 coil and that was about 1 ohm of resistance. I filled up a 1 quart (about 1 Litre) measuring cup full of water about 85 degrees (around 30 degrees Celcius). I calculated that it would take about 94 watt hours of energy if all the energy went into the water, and no water escaped. I have a cheap voltmeter/ammeter/watt hour meter that I planned to use. I hooked it up, and the wire began to get warm, but no display on the wattmeter. I looked at the directions and I needed about 6 or 7 volts to operate the meter. So I got out the very first pack I made a 4s 10p pack and hooked it up.

The jumper wires got toasty and I quadrupled up the jumper wires. The wattmeter came on so I zeroed it and took picture number 1:image_hzedyz.jpg


It was about 85 degrees outside, and about 7:45 pm. The water heated up, and turned tea colored, and I probably separated some water molecules into H2 and O2 molecules. At about 8:30 or 90 Watt hours into the heating, Cell Bank 2 was very low about 3.1 Volts, and the rest were around 3.5 or so., So cell bank 2 in this pack is very weak. I soldered aligator clips to a tp4056 and put cell bank 2 on charge in order to get more energy out of the pack. Here is Image 2 about this time

image_upzhgl.jpg
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I let it run, and at 9:00, I put a plastic cover over the water to limit heat escape through evaporation. At the end the Voltage rapidly fell off, and the water was at 190 Degrees F.
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I was able to get about 200 watt hours out of the pack, pulled about 12 to 13 Amps from the pack which is about 1.2 to 1.3 Amps per cell. It was about 80 degrees F outside, and the cells got to about 105 degrees F (40 ish degrees C). The water looked like Tea also, even though it was probably just Iron Oxide from the stainless Steel. Half of the coil was black. I will probably switch the polarity of the SS coil and run it until it heats up the water without visible discoloration, then I might actually make tea. I will make some current shunts, and get thermisters in order to test the 1sx40p pack. I will probably make a few different coils to pull 1 A per cell, 2A per cell, 3A per cell, and maybe 4A per cell. And then try to bake or fry a potato.

I never thought I would be so excited about cooking a single french fry or potato. But I can test all sorts of test equipment and ideas in the process.

-Cheers,
Ryan.
 
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