Dont buy a chiller ... use a heat exchenger

[mark]

I had tried similar to warm the source water for the ro unit. Thought higher temperature better rejection rate, don't think it did anything so removed, plastic not being the best for heat transfer. Did get lot of tubing out of it for other projects.

[RuGlu6]

Originally Posted by mark

I had tried similar to warm the source water for the ro unit. Thought higher temperature better rejection rate, don't think it did anything so removed, plastic not being the best for heat transfer. Did get lot of tubing out of it for other projects.

Plastic is definitely Not the best material for heat transfer. But it works on small water volume like mine (65 Gal +sump).
My tank is 23.5 C rock solid even when its hot outside. And that is on slow drip rate.

If you search for NEU you will find that they use heat exchange principle as well.


they use same principal but they extract heat from sewer and storm water via heat pump and thrugh heat exchangers heat up water for Olympic village and SE False Creek. They make tons of money and are being able to keep heat and hot water rates below what BC Hydro charges to do the same with electricity.

If you ever get to go to any of the mechanical rooms of the building that is hooked up to NEU and look at the size of the heat exchanger that serves 4 or so story building you would be surprised how small it is. Its approximately 3 feet high by 2 feet wide !. This is not a joke. Obviously its not made out of plastic, and its thermally insulated, my point is, its very efficient.