sorry for waking up this thread, but I still haven't come to terms with my loss in efficiency. Here is what I posted in a different thread that died out before this one started:
All I do is boil in 2 pots, chill with my immersion chiller, and pour the wort into the fermenter through a strainer to remove the hops (most of my recipes use less than 2 oz of hops). Would this be enough contact to lose 133 grams of sugar?
I decided to revive this thread since I have the same question and am hoping someone has found an answer. I calculated my pre-boil efficiency to be up near 85%, but my post-boil efficiency was down at 77%. I know my readings are as accurate as I can get. I adjusted for temperature for all SG measurements, but for the volume measurements I did not adjust (doesn't matter much anyways since its off by less than a percent).
I had 7.33 gallons of pre-boil wort with an SG of 1.047 and 5.25 gallons of post-boil wort with an SG of 1.059. I adjusted the pre-boil SG to be based off of a volume of 5.25 and got an SG of 1.066. I then calculated the density of the two volumes, then multiplied by the volumes to get the total mass of the two measurements. I then found the total loss to be about 133 grams of sugar.
All I do is boil in 2 pots, chill with my immersion chiller, and pour the wort into the fermenter through a strainer to remove the hops (most of my recipes use less than 2 oz of hops). Would this be enough contact to lose 133 grams of sugar?