Cooling with the BM 20L PLUS

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Cooling with the BM 20L PLUS

Unread postby tknuts » Sun Apr 16, 2017 8:35 am

I just finished the first batch on my BM 20L Plus. But it took 1 hour to cool down the worth. The result batch size was 18L so the cooling jacket did not cover the wort entirely.... Also the water on output was cold, which in my terms shows an inefficient cooling system.
I tried with pump on and off, no difference in cooling speed...

Does anyone have similar experience?

Would it be advantage do make a whirlpool during cooling?

Can the BM's own temperature measurement be trusted during cooling? The reason is that the worth was below 20(C) in the fermentation tank, but measured 28(C) on BM?

I'm a bit frustrated here, will have to buy a cooling spiral now :-(

Advice much appreciated, one hour of cooling is just not good enough...

Regards, Thomas
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Re: Cooling with the BM 20L PLUS

Unread postby mashy » Sun Apr 16, 2017 9:54 am

If you bought it in the UK there might be a case for returning it "not fit for purpose" under the consumer laws.

Try jaded brewing for coils. The high street ones are a bit limited.
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Re: Cooling with the BM 20L PLUS

Unread postby airborn » Sun Apr 16, 2017 12:39 pm

I have just finished my belgian wit and as I read your post I timed the cooling on my BM 20+

Reached 80'c in 3,45 min/sec
70*c------- 5,45
60*c------- 8,25
50*c------- 11,40
40*c------- 15,55
30*c------- 22,12
20'c------- 32,47 min/sec

Sure it's not as fast as the chiller but it's fast enough and easy :)


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Re: Cooling with the BM 20L PLUS

Unread postby mashy » Sun Apr 16, 2017 1:06 pm

That's interesting. What was the volume? Did you have the pump on?
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Re: Cooling with the BM 20L PLUS

Unread postby airborn » Sun Apr 16, 2017 2:13 pm

mashy wrote:That's interesting. What was the volume? Did you have the pump on?

Pump on
Volume 23 l.


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Cooling with the BM 20L PLUS

Unread postby tknuts » Sun Apr 16, 2017 2:42 pm

33 mins is acceptable, my Wort reached 80 quickly, but then went really slow from there.. got me thinking.. a lot of the hops were stuck on the side, where it should cool, this could also the cause the cooling process to slow down.... and it was a lot of hop settlement on the inside of the kettle.

Did you have the cool water supply in the top or bottom connector?
Do you use the BMs own temperature measurement ?
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Re: Cooling with the BM 20L PLUS

Unread postby airborn » Sun Apr 16, 2017 3:28 pm

I use hopsocks.
Water in at bottom to get the air out.
Used BM temp but checked with other. No reason to doubt BM ;)


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Re: Cooling with the BM 20L PLUS

Unread postby tknuts » Sun Apr 16, 2017 3:58 pm

Thanks... will give it one more shot, before buying a chiller :-)


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Re: Cooling with the BM 20L PLUS

Unread postby airborn » Sun Apr 16, 2017 4:23 pm

tknuts wrote:Thanks... will give it one more shot, before buying a chiller :-)


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Go' ide'
Ellers ringer du bare



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Re: Cooling with the BM 20L PLUS

Unread postby mashy » Sun Apr 16, 2017 4:41 pm

I really hope this comes good, because the initial findings were not to promising.

30 mins isn't quick, but certainly better than we first thought.

Normally I would have said 'in' at the top to get the best thermal co efficiency- but if the pump is on will it really matter ? I dunno.... and would 2.5 bar water pressure expel all the air or leave air pockets ??

I regulate my water flow by hand temp - I can't see the need to run gallons through if it is all coming out as cold as it went in..
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Re: Cooling with the BM 20L PLUS

Unread postby darrenwh » Fri Apr 28, 2017 2:38 pm

Tested mine out this weekend, got 40min to cool down from 76 to 23 I did slow the flow down towards the end but found the cooling rate slowed, so next time I'm going to keep it at maximum flow rate through for the whole time.
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Re: Cooling with the BM 20L PLUS

Unread postby judgecc » Fri Apr 28, 2017 3:11 pm

Seems like a looooot of waste water. Sadly
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Re: Cooling with the BM 20L PLUS

Unread postby bierfest » Fri Apr 28, 2017 4:43 pm

Using the Speidel SS spiral chiller I normally cool a 25l batch on my BM 50l in 20-25 mins max.
I wonder if the amount of water used on the BM plus would be less or more if the same water pressure was used
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Re: Cooling with the BM 20L PLUS

Unread postby mashy » Sat Apr 29, 2017 5:39 am

I think it is a surface area thing.

I have a double coil. 7 mins and 3 buckets water which is ideal for wash down.
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Re: Cooling with the BM 20L PLUS

Unread postby judgecc » Sat Apr 29, 2017 9:01 am

Somebody needs to measure the amount of water during cooling with the plus model..
Im around 2-4 30liters buckets of water for cooling with my homemade immersion cooler as well. During biab brewing 20-25 liters. Never measured my Bm50 though.
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