Water to drain
Water to drain
(OP)
We have a heat exchanger that is water/glycol on one side and domestic water on the other.
The domestic water goes to drain after going through the heat exchanger. The temperature leaving will be 170F. Does anyone know if there are any restrictions on water temperature going to drain? If so, what are they?
I could increase the flow to lower the temperature but the customer is trying to waste as little water as possible. Personally, I don't like the idea of wasting any, but I've been overruled.
The job is in the midwest USA.
The domestic water goes to drain after going through the heat exchanger. The temperature leaving will be 170F. Does anyone know if there are any restrictions on water temperature going to drain? If so, what are they?
I could increase the flow to lower the temperature but the customer is trying to waste as little water as possible. Personally, I don't like the idea of wasting any, but I've been overruled.
The job is in the midwest USA.





RE: Water to drain
When we have dishwasher discharges that are too high, we install a type of mixing valve that lets in some domestic cold water and cools the effluent below 140. Not sure if that would work in your case.
RE: Water to drain
Depending on volumes/flows/durations you could also use a storage tank and allow the water to cool to 140 before discharging.
RE: Water to drain
Seems like a huge waste of energy, too.
RE: Water to drain
TTFN
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RE: Water to drain
RE: Water to drain
B.E.
RE: Water to drain
RE: Water to drain
We're going to have a meeting to discuss this next week. Apparently the customer is also beginning to think draining all this water is unnecessary.
RE: Water to drain
I could increase the flow as it's not limited (to a point). But, my goal is to minimize wasted water.
RE: Water to drain
RE: Water to drain
-- domestic hot water preheater?
-- cooling tower basin (to offset blowdown)
-- irrigation??
How much water are we talking about? If it's only a couple gpm, there is no payback to doing anything except tempering and going to drain.
RE: Water to drain
No, they don't have any other significant use of water. Most of our systems do, but not this one.
RE: Water to drain
RE: Water to drain
TTFN
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RE: Water to drain
RE: Water to drain
Why use glycol and heat exchanger altogether? Where is your primary medium coming from? hot water boiler? could you elaborate on the application itself? what is the high temperature glycol used for?
You could use a steam boiler that would allow you re-use of the high grade heat in the form of condensate. With a shell and tube heat exchanger. Hardly any waste at all.
RE: Water to drain
This particular job does not involve any boiler. On jobs where we use boilers we do often use the condensate.
RE: Water to drain