Ok, I've run some numbers and convinced myself that this isn't a problem. Sorry, this will be technical.Can anyone share their method please of dry-hopping after fermentation has finished? Surely opening the fermenter and putting in the hops after fermentation completion will ruin the beer? I would like to do this also as that's what Verdant do, but I'm scared to do so because as the hops travel down through the beer, it will introduce oxygen.
just opened up the fermentor and chucked them in as quickly as possible
Had the ferment finished at this point or was there some time left for the yeast to reduce the oxygen that was introduced?
Here is my harlequin NEIPA.
Ok, I've run some numbers and convinced myself that this isn't a problem. Sorry, this will be technical.
If we assume the worst case scenario, e.g. the headspace is entirely air after dumping in the hops, then my calcs are:
Headspace contains 21% or 210,000ppm O2.
Solubility of O2 is 1.22mmol/l (at 25 degrees)
O2 is 32g/mol, so solubility is 39mg/l
Now air is 21 % O2, so that becomes 8mg/l - this fits with real world data
8 PPM would be ruinous, so we purge.
At 20psi, each purge removes 57% O2 (from googled tables), so
8 x 0.43^7 = 20ppb, which is within an acceptable range.
In reality, the partial pressure at the start is less than 0.21 atm, as we have been careful putting the hops.
Checking cost of said purge. Say 2l headspace 7*20/14.5 = approx 20l of co2, or about 40g, no worries. Could do a few more purge cycles for belt and braces.
Happy to have this rough back of the envelope calc peer reviewed!
Has anyone tried hops in the mash to help with oxidisation? Does it really work?
That wouldn't work for this style. You want the hop aroma and that would be driven off by the mash and then the boil so there would be nothing left.Has anyone tried hops in the mash to help with oxidisation? Does it really work?
Can anyone share their method please of dry-hopping after fermentation has finished? Surely opening the fermenter and putting in the hops after fermentation completion will ruin the beer? I would like to do this also as that's what Verdant do, but I'm scared to do so because as the hops travel down through the beer, it will introduce oxygen.
Just made a Harlequin single hop NEIPA, and it is incredible! Didn't follow the pellicle recipe exactly, brewed my usual way.
Incredible aroma from this, and incredibly juicy. I get passion fruit, pineapple, and mango.
Like the article says, I'd mix this with something else to add another dimension (Azacca maybe), but I am on no way disappointed with this beer.
English hops ftw.
Weirdly enough, after looking through this thread I found these aswell!! And was equally interested lolThis thread is about English Tropical style hops. Has anybody else tried the Tropical England mix from Crossmyloof. I have and it makes a nice tropical flavour not as strong as American hops but I am sure that with large amounts it may be a option as a IPA or Neipa. When I got my last lot 450g worth Steve said they were looking at putting Harlequin in the mix in the future. Below is a lift from their site
- TROPICAL ENGLAND 2020 crop • 6% AA. A mix of 5 English grown hops including Jester, Olicana, Godiva, Mystic & Archer that will infuse a tropical aroma into a refreshing English IPA with a difference. 100g late addition/dry hop will do just nicely in a 23 litre brew, but adding another 100g will hit the mark.
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