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  1. Neo47

    Uneven heating on HVAC heating coil (air-water HEX, copper fin tube)

    @BronYrAyr The thermal image is for the bottom coil marked 4 in my previous post.
  2. Neo47

    Uneven heating on HVAC heating coil (air-water HEX, copper fin tube)

    Thank you all for the responses. I will try to address all the questions here. The piping for the coils is shown below. @immsk Has there been a water audit done to see what the actual flow rate and pressure drop through the coil is compared to the original design? I am not aware of such a study...
  3. Neo47

    Uneven heating on HVAC heating coil (air-water HEX, copper fin tube)

    We have a air-hot water heat exchanger on an Air handling unit that has uneven heating. Attached photos explain the situation. The coils are made of copper. The air handlers use 100% outside air. The IR photos show that when the valve opens hot water fills up the supply header but does not...
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