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Generator Heat Exchanger VS Vacuum motor heat exchanger

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  • Generator Heat Exchanger VS Vacuum motor heat exchanger

    Question: Which would be more effective? Hx for generator or hx tied into two Air Hogs?

    Answer: The heat exchanger from vacuum exhaust is usually copper system and used before the pump at temperature to up to 140 degrees at building pressures.
    Engine heat exchangers are stainless steel and used in high pressure applications (under 2000 psi) for temperatures up to 235 degrees.
    You can expect to pay up to $1000 for each type depending on the amount of tubing installed inside.
    I have tried fining btu rating charts on line and though a fount it once, never have since.
    The engine is under 100 cfm at 1100 degrees while the vacuum motors would be 250 cfm at 180 degrees.
    When you multiple these numbers together 110,000 from the engine or 45,000 from the vacuum motors.
    By these numbers an engine heat exchanger should provide twice the heat as the vacuum motor exhaust.
    We know from the Goliath heat exchanger it will provide a very constant 30 degree rise from 110 degrees to 140 degree and used before the pump.
    The 13 to 16 hp single cylinder engines can heat water from 65 degree cold to 210 degrees.
    The key is the flow rate. Performing high flow cleaning, pressure washing, tile cleaning need a lot of heat and might want to consider both heaters back to back and even feed theses heaters with hot water from the customers home.