Here are some handy numbers for computing cooling requirements when extracting cannabis using LPG or QWET:
https://graywolfslair.com/index.php/15-diy-equipment/15-32-cannabis-extraction-thermodynamics-101?fbclid=IwAR0URLVe2Szt5v4yktVzmKjikwU2RksYxkzjD1Ck5kp5NFOTJi5u8PsaOcc