I am not normally involved in HVAC matters. But I need to spec out a basic chiller system which I'll describe below; and I'd tremendously appreciate some inputs on this.
I work in a laboratory and have a new "furnace" (instrument that heats copper up to its melting point). It is a state of the art furnace and well insulated, and will be heating up to 1100 Deg C. in the heated part. The manufacturer of the furnace has an inlet and outlet hose fitting on the rear to run water through for any time it goes over 700 Deg C. The purpose of the water is to keep the electronic controls and so forth cooled down when it is running at its hot temperatures.
They say to run tap water through it at about 1/4 GPM (13.6 GPH, or 1 Liter per minute). That is all the specs they give. Since they say tap water, that means a continuously flow of ambient temp water then down a drain. I can't do that (for water conservation and cost reasons - use a lot of water), so I need to create a closed loop system that will adequately cool the water.
I am figuring on the flow rate they specify, and that water I send in will be around 75 Deg F, and I am presuming the water coming out will be less than boiling. So I am figuring about a 103 Deg F delta temp. So using the those numbers, I came up with around 20,000 BTU/Hr.
I don't need precision cooling, just something low cost that will work. But everything seems to be too big or too small or too expensive.
I'm thinking of getting a 55 Gallon plastic water barrel, a small water pump (like for RV's), filling with store bought distilled water (or maybe even filtered tap water). Running clean garden hoses from the barrel to the furnace.
But I'm still left with the chiller part. I believe with the set up above, the water will heat up fairly quickly. At 13.6 GPH, the water would be burning hot in about 4 hours.
So I'd REALLY appreciate any suggestions on a low cost way to cool the water. It doesn't need to be precise or 100% efficient. It needs to reasonably cool the water that was heated by the furnace and not ice up.
I'm even thinking of buying a drinking fountain remote water chiller. Or, does anyone know of any submersible cooler elements that could be put in the water barrel, or perhaps an inline cooler element to place either in the ambient inlet line, or the hot water outlet line on its way back to the barrel?