I have a heat exchanger with Dowtherm A vapor on the shell side in condensing service. This is part of a closed heat transfer system with a fired heater maintaining the supply temperature and pressure. The outlet pressure increases over time on the return side of the Dow system. Is this any indication of reduced heat transfer? There is a control valve on the inlet of the Dow side. We maintain a constant flow, but the valve has to open up more over time. The tube side fluid is an oil that partially vaporizes. Am I getting inerts in the system? What else could cause the pressure increase? The Dow system should be a clean fluid.
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