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  1. TheHub

    Noise Reduction with Fiber glass

    I am not sure what type of noise reduction you are looking for, but after installing insulation a reduction of 10 DB is outstanding. Sound level in decibels is a logarithmic rather than a liner measure of the change in pressure with respect to a reference pressure level. A small decrease or...
  2. TheHub

    CALCULATING TEMPERATURE DECREASE IN EXPANSION VALVE

    Be careful, in the Joule-Thompson expansion, temperature increases or decreases during the throttling depending whether the Joule-Thompson coeficient is negative or positive. I know it is rare for the temperature to increase, but it can bite you as I have found out.
  3. TheHub

    Hot Wall Insulation or Curtainwall

    I have a problem with a room wall that is very warm (115 deg F). The room design temperature is 77 deg F. The wall is adjacent to a open feedwater heater/turbine building (FWH). The wall facing the FWH can reach 135 deg F. The room wall is a small area 10ft x 12ft and is approximately in the...
  4. TheHub

    Home hot water heating!!

    I agree with TBP this is a common occurance in both heating systems and in home water systems that include a well pump. If this were a water system the pump would short cycle due the quick reduction of pressure, no compressible bubble. The few drops from the relief could be the best clue. The...
  5. TheHub

    Thermal Relief Valve Calculation

    We are in the process of performing a thermal relief valve calculation and have found no good reference to check the calc. Can anyone provide general equations and a reference for this? Thanks

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