|VARIETY||TARGET HARVEST DRY MATTER||1% INCREASE DRY MATTER EVERY "X" DAYS|
Hop percent dry matter equals:
• Dry cone weight minus Empty container weight
• Green cone weight minus Empty container weight
multiplied by 100 to get a percentage
eg: Pick 100 grams of fresh green hop cones
Weigh a microwave safe container and write down the weight.
Place hops in the container & proceed to dry the hops in the microwave for 30 second bursts and remove and weigh the result from each burst. ( be careful, the container may be hot)
Continue until you get 2-3 readings where the weight does not change. There you have the dry weight. It needs to be in the low 20s
So say the container weighs 250g.
The equation would be something like:
273g minus (the container) 250g = 23g
Because we started with a Green cone weight of 100g then the dry matter is 23%.
• BREWERS FRIEND - DEHYDRATOR
• INDESTRUCTIBLES - OAST
• HOME BREWERS ASSOCIATION - OAST
• BEER & BREWING MAGAZINE - OAST
Target weight =
Harvest % dry matter x Green sample weight without the weight of the mesh bag
Target % dry matter
Target sample weight =
23% x 100 g = 23 grams
Target sample weight + bag = 23 g + 11 g = 34 grams
The total weight of the subsample will be 34 grams (cones plus mesh bag) when the cones in the oast reach 8% moisture.
Moisture Shrink (%) = Mo – Mf x 100
100 – Mf
Mo = original or initial moisture content (%)
Mf = final moisture content (%)
The moisture shrink for drying hop cones from 77 percent moisture (23 percent dry matter) to 8 percent moisture content is:
Moisture Shrink (%) = 77 – 8 x 100 = 75 %
100 – 8
Therefore, if you place one hundred pounds of hop cones into the oast at 77 percent moisture (23 percent dry matter), it would weigh 25 pounds after drying down to 8% moisture [100 lbs - (0.75 x 100 lbs)] = 25 lbs.