This morning I roasted three pounds Sumatra Mandeling in my BBQ roaster. Everything went as planed. Roasted to Full city+ pulled drum dumped into my shop vac bean cooler to cool. The smoke was pouring out of the shop vac then I noticed it slowed suddenly that when I saw the plastic hose had collapsed on it self and restricting the flow of air.
The moral of this story is roasted coffee is hot! And Plastic melts.
I have a 4.5 HP Shop Vac brand vacuum. I guess it is back to the drawing board. I think I'll try PVC or maybe pick up an old vacuum hose at Goodwill. Any suggestions?
I'd have to agree with this suggestion. However, do make sure you stretch out that hose to it's maximum length so the air can cool off before it hits the shop vac's internals. Wouldn't want to melt the shop vac's motor housing.
If you want to take this to the geekiest limit, there's a heat exchanger that's sold for wood stove flu's. It's basically a sheet metal box with a bunch of tubes run through it and a fan to push room temperature air through the tubes. The idea is to recover heat that would other wise be run up the chimney and lost to the great outdoors in the winter. With some adapters, you might be able to put this in the line going to the shop vac.
Today is roasting day I have five and a half pounds of coffee to roast. The more I think about the temperature of my beans I wonder how long my shop vac motor will be able to deal with the heat. I could increase the length of hose to give the air time to cool or take Bob's advice and reverse the air flow and blow air threw the beans. I like the idea of sucking the air threw the beans the bucket catch all the chaff. But I also like my shop vac. So folks I now have a Roseman Bean Blower. It's a little messy. Chaff blowing all over the garage but I guess the leave blower will take care of that.
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