induction heating of water

[DEMPSEY]

Does anyone know if I can use a 2kw induction hotplate to heat 200 litres of else what size on induction plate is needed.

[johnrm]

Are you taking a bath?
You'll be a while. Treat them the same as a regular element on terms of how much they heat.

[Hop Bomb]

http://processheatingservices.com/water-heating-time-calculator/

Saw these in maplins at the weekend for 65e. Pretty big size. Might be a load of shite though

http://www.maplin.co.uk/p/slimline-induction-hob-a21nw

[UpsidedownA (Andrew)]

If you neglect heat losses and any soiling on the heating surface, the formula is:

volume of water in litres (i.e mass of water in kg) x 4.2 x temperature difference in celsius) / kW supplied by your heat source = number of seconds to heat up to required temperature.

Circa 4.2 is the specific heat capacity of water in kW/kg˚C

[imark]

I use a 3kW induction for 30L boils and it's an acceptable power. Scale that up linearly and you're looking at 20kW. I don't think induction is feasible currently at 200L scale. I'd say gas burner is the way to go for a kettle. I presume that's what you mean?

[TheSumOfAllBeers]

How long to get up to full boil though? 68 to 100ish? Looking to get a bigger kettle and go the induction route, but not too keen to wait around for water to heat, as I do a lot midweek brewing

[Hop Bomb]

I cant recommend the blichmann burner highly enough for big volumes. I got from 40c to boiling yesterday in 20 mins with 70 litres of 1.047 wort in the kettle. (mashed & mashed out the night before hence going from 40c)  Ramp it up til the flames almost whick around the sides to get to boil & then turn it all the way down for rolling boil. Uses feck all gas in the rolling boil stage. Feckin ates it on full tilt. Like a jet fighter engine.

Whats the max KW induction hob you can get at a big diameter to suit a 100 litre + pot?

[DEMPSEY]

Reason I ask is I acquired 3 S/S pots yesterday and they are big. Industrial caterig quality and all fitted with induction bases. But your man said that the big one was 200 litre. ow they are big but not that big. 500mm ID width for 2 of them with one 480mm height ID and the other 200mm Height ID. Calculates to 92 litre and 39 litre for both. Last one is 450mm ID width and 280mm ID height calculates to 44 litre.

SOooo why I was interested in them was the width as it can get a better layout for brew pot design. Kettle with a wider floor is better for wort circulation to cone up the spent hops and a mash tun that has the grain bed spread wider rather than deeper is easier to drain. Want to have a clean heat source outside the Kettle hence the induction question.

[DEMPSEY]

Here they are

[TheSumOfAllBeers]

Its limited by the trusty old 13 amp plug, the max load being 3kw approx, though I have seen built in induction cooker hobs with 8kw rings.

Induction cookers are on the 65 amp circuit. Hence they can do better loads.

3 phase units might be an option if your house is tooled for it, or if you live in a marina.

[Garry]

3-phase? Now you're talking.

8 kW, can accommodate a ø558mm pot,  only $4350 

http://www.hotelrestaurantsupply.com/CTK-MSP-8000-400.html

[DEMPSEY]

Ok $$$$$$$ fook dat won. Whay about using a standard cooker hob.

[DEMPSEY]

Looking at a 4 plate electric cooker hob  now. 1800/1800/1500/1000 watts so a total of 6.1 Kw when all is running. SOooo my 92 Litre pot has say 80 litres in it and the 4 plates are running. When it is at full boil I want to dial back all 4 plates together so was wondering if I can have a trottle back switch that will turn down all the elements at the same time. This switch will of course be easy to access safely from the hot hob.

[Vermelho]

Not sure this will help your cause but might be a question to ask about induction hobs. we have an induction hob at the moment and all rings can't be turned up full at the same time. The rings are paired so for example on the left side, when one ring is up full and you turn the other ring up also it begins to dial the full ring back each time the opposite ring is turned up. So eventually full power for both rings is 5 each.

Not sure if this is the same for all induction rings but thought I'd throw it put there so you don't get a nasty surprise after buying your shiny new hob.

[DEMPSEY]

Thanks for that, I have being browsing the web and have found out stuff like you have just confirmed now regards induction hobs. I am thinking now of the bog standard electric hot plates are the way to go.