Sssooo… the Secret Project nears completion. Sorry, no pictures yet.
It’s a water-heated tube.
I had a spare 2-1/4” LeLuv tube, one of the cheap ones. I bought a roll of 1/4” clear vinyl tubing at the hardware store, and it was enough to coil around most of the length of the tube, with the coils touching.
I ordered some 90 degree barb fittings to press into the ends of the tube, then warmed up some Shapelock plastic and started wrapping the tube. The Shapelock sticks very well to the acrylic and vinyl. I used a ring of Shapelock to start wrapping, blobs here and there to keep the coils in place while I was working, and another ring of Shapelock at the end. The tubing seems to be firmly anchored to the tube. The poor LeLuv tube now looks like a prop from a cheap science fiction movie.
I needed a source of hot water. I was looking at immersible heaters, decided an old-school coffee pot might be ideal, and then found the local dollar store was closing out crock pots for $5, so I bought one of those. I bought a programmable temperature controller from eBay, and an external “inline” aquarium pump, an aquarium valve, and some minor oddments. I still need to add a 1/8” hose barb to the end of the LeLuv tube.
It’s pretty much a Rube Goldberg arrangement, but hot water gets pulled out of the crock pot, pumped through the coil of vinyl tubing around the pump tube, and returns to the crock pot. The programmable temperature controller will be set to 110F. I need to get a power strip so the crock pot, pump, and temperature controller all have one switch.
The vacuum fitting at the end of the tube goes to a 20oz water bottle that acts as a water trap, then on to the vacuum pump.
The extra, 1/8” barb has a hose running to a 10oz bottle full of water, with an aquarium valve.
Theoretically, once I start the vacuum pump and get a good seal, I can open the aquarium valve and vacuum will pull water from the 10oz bottle into the empty spaces in the LeLuv tube. Then I close the valve. If I don’t, most of the water will be sucked into the 20oz bottle, which is big enough to keep any of the water from getting in the vacuum pump.
I’m still waiting for minor fittings and bits to show up, but I should have everything I need.
This project has been dragging on a while - I’m an expert at procrastination - but at the time I was having problems finding an electric heating pad the right size to wrap a tube with, and I had just finished a homemade CPU cooler for my computer, so it seemed like a logical thing to do… and that also kept my naughty bits away from potential electrical oopsies. Nothing but water and vacuum hoses attached to the tube.
I have some room in a 2-1/4” tube; water is a better conductor of heat than air, and I wanted to try water pumping anyway.
The announcement might be slightly premature, but I just ordered the last (hopefully) hose adapters and bits, and I’m pretty excited that it’s finally coming together.
“You’re late!”
“No, no, no, you’re early.”
“I’m never premature.”
“Oh, well, that is a surprise, given what I’ve heard. I’m sure it’s a matter of perspective, really. But for a Narn, two minutes must be a long time, so if you go the duration, it’s an accomplishment. But for the Centauri, hours can go by before you even get to the good parts.”
— G’Kar and Londo in Babylon 5: “Rising Star”