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Thread: SLM buys a flower shop van

  1. #21
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    Very neat. Any idea how hot it will get the water?
    -Formerly Stabulator

  2. #22
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    Well in theory, especially since I'm going to be recirculating the water between the water storage tank and the heat exchanger, it could get it as hot as the engine coolant. But, I'm not sure how much just one pass through the heat exchanger will heat the water. That's one of the big reasons I decided that I needed to put some kind of control and monitoring on the coolant flow through the heat exchanger. From what I can read online, the polyethylene water storage tank shouldn't be subjected to over 120deg F, so I figure as long as I regulate the temperature of the coolant going into the exchanger at or below that, there's no chance of the water getting too hot.

    I can also do some testing to see if maybe there's a little leeway where I could allow the coolant to go a little hotter than that, with the understanding that just one pass through the heat exchanger won't get the water to quite the same temp as the coolant, and even if the water going back to the tank is over 120deg, pex tubing is rated to 200deg, and as soon as the water coming back from the exchanger gets back into the tank, it'll be mixing with cooler water that's already in the tank.

  3. #23
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    As an fyi: PEX expands length-wise when you run hot enough water through it. I don't know if the temp or the distances you'll be plumbing are large enough to make that an issue, but it can lead to irritating intermittent leaks or rub-through.
    -Formerly Stabulator

  4. #24
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    Shouldn't be a problem. The run from the heat exchanger to where it goes through the floor is only a couple of feet. And it makes a 90deg bend just before it goes through the floor, so lengthwise expansion would just move this bend a little bit. I also have the pass through the floor protected with rubber grommets to prevent any chafing. Thanks though.

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