hrafnkell wrote:Bjór og aðrir vökvar halda kolsýru verr því heitari sem þeir eru.
Til dæmis þegar þú hellir volgu kóki í volgt glas þá freyðir það mikið meira (tapar kolsýru) heldur en ef það væri kalt. Það er hellings kolsýra í útaf þrýstingnum sem er í flöskunni, en um leið og þrýstingurinn fer og það kemst hreyfing á vökvann þá fer mikið af kolsýrunni. Það sama gerist með bjór nema hann sé kaldur. Ég er ekki viss um að það sé hægt að skenkja volgum bjór í 2.4 carbonation án þess að fá aðallega froðu úr krananum. Það myndi líklega strax skána ef þú kemur bjórnum niður í 10-15 gráður, til dæmis með vatnsbaði eða einhverju svoleiðis.
You can, but you need to wait a while when you move it to a new temp.
if you apply 30psi at 20°C for two weeks, it will equalise with 2.4 volumes of CO2 _in_ the beer, (let's say) with 30psi partial pressure above, (and effectively zero volume, because it's all still gaseous)
If you then disconnect it from the gas, put it in the fridge at 5°C, and reconnect it to the gas at 15psi, the beer still has 2.4 volumes of CO2 dissolved in it. There's a little mix up with the (tiny) volume of 30psi gas on top, but that just marginal volume just gets absorbed in as it cools down. The 15psi at 5°C just keeps it stable at 2.4 volumes.
You won't have any foam _in_ the keg, but if you try and use two two different pressures and temperatures with the same length of serving line, yes, you're screwed and will have foam coming out of your eyeballs.
Choose the length and diameter of your serving line to match the _expected_ serving temperature and serving pressure. (ie, I use ~2m of 5mm ID tubing for serving at 5°C and 12-14psi)
Don't try and serve until the temperature has equalized
More to the point, doing this sort of room temperature gassing requires either a) two pressure regulators, or b) continually adjusting back and forth.
Just put the keg in the fridge on the serving pressure and wait 10-15 days. Problem solved.
(I've never had much luck trying to turn the pressure up and shake the keg, I just always end up with foam or unpredictable levels of gas)