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I am working on a project for an anodizing plant and have specific water temperatures required in five separate tanks. Each tank will recieve the temperature needs from a line drawn off of a seconadry loop. Each Supply and Return for the tanks will have a heat exchanger installed to separate the system water and the liquid in the tanks. Supply tempertures will be controlled by a three-way mixing valve on each line.
I am leaning towards installing it on the boiler side of the exchanger to protect the valve (some of the tanks will have H2SO4 in them) and have the contractor account for the temp. drop across the heat exchanger. I have never set things up this way before and am wondering if there are any potential issues by having a pump pulling through the mixing valve and then pushing into a small heat exchanger (3x8-20 plates).
I will try to add a drawing tonight to explain thing a little better. It is a bit of a backyard operation that the contractor is aware that pumps will be wrecked continuously on the tank side.