I’ve been looking at cooling products, thinking about the dogs and the heat this summer.
Something that came up on my searches was a circulating ice-water device. They come in vests for people, and “pads” for icing joints etc.
It seems to me that I should be able to make something like this fairly simply? I’m looking at these little cheapo water pumps:
Some tubing (sewn into a pad or similar), a cooler full of ice water, and a power supply… what am i missing?
Phase change material. Ice is good but there are more interesting things available now.
I know a few fire fighters who wear this stuff under their gear. High tech RPCM compounds melt, absorbing heat at around 18C… When they are fully liquid (can last about 4 hours) you swap the packs for ones you keep in the cooler packed in ice. This is safer than using ice directly because the transition temperature is uncomfortably cold for ice. My preliminary reading indicates that many manufacturers are making PCM packs with a simple blend of wax and coconut oil. Straight CO melts at around 24C… Which might be good enough as a starting point.
PCMs are used in dog cooling stuff, for sure. The down side is that you have to have a way of keeping it against the dog, which is tricky if the dog is interested in consuming things like coconut oil…
The advantage of the circulating ice water idea is that we could make something that would sit underneath the dog’s crate, outside of his accessible zone. The PCM doesn’t get cold enough, and it is tricky to keep replacing it with cold packs through a long day.
Here’s a PCM commercial example:
You could run the pump from the dogs water dish. Easy to add ice to.
Or you could use a peltier cooling device. Use it to cool the water or have a metal screen inside the dogs bed and hook the screen to the cold side of the unit. The screen will conduct the heat away. Then you need to have a fan to blow air on the hot side.
Would like to learn more about peltier.
Re water dish, would rather they drink warm water and keep the circulating water in an insulated cooler…
Someone stole my idea and it’s for sale for $225 USD…
Heh, the mats are only $50. The pump, battery and insulated case can be hacked for a tiny fraction. Hell, you could use a clever thermal-siphon setup and do away with the battery and pump if you like physics.
The cooler unit is probably an ordinary 12v cooler with an aquarium pump
Yep. Use it with a cordless drill battery, sealed lead acid, or RC plane battery. Should cost $20-50 for the battery, $10 for the cooler, $10 for the pump? Less if you shop around.
Edit to add:
It is usually sunny in Kamloops on a hot day.