derrilex wrote:
Not on purpose. I just carefully stuffed the cavities with insulation. Why would shot temps decrease ? that makes no sense. 😃 Temps should either be hotter or more stable but not colder IMHO
Think about what you are changing. Pstat holds boiler temp steady, no change there. Insulating boiler reduces temperature loss from boiler and duty cycle. Internal temperature in cabinet decreases, therefore increasing heat loss from lines between heat exchanger to group head. More loss in the lines means lower group head temperature. Simples! Except of course, you have both noticed a rise in temperature, so I am clearly wrong. Not so simple! Perhaps the faster heat up of the boiler results in overshoot at the high end, but insulation reduces overshoot at the low end (should be visible on pressure gauge)? Perhaps insulation on part of the heat exchanger lines counteracts the lower case temperature. Perhaps the reduced temperature in the casing increases flow rate through the thermosyphon loop (I am guessing flow rate is primarily determined by temp differential between flow and return lines). Anyone understand the physics at work here and care to explain?
