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Recent content by RJVAN

  1. RJVAN

    Size of condensor coil

    I'm not sure how condenser size would affect humidity. I would speculate that either 1)the evaporator is too small, and can't keep up with the moisture (in which case the A/C woud be running constantly. Of course if the system is low on refrigerant, that would cause the same effect. or 2)it's...
  2. RJVAN

    Cascade System

    Depending on system specifics, CO2 vapor has 6-10 time as much cooling capacity PER CUBIC FOOT than NH3 vapor. That is, for a given number of BTU/min fed to the liquid refrigerant, CO2 produces fewer CFM of vapor. (Conversely, NH3 has better BTU/lb than CO2 because its vapor is less dense). It's...
  3. RJVAN

    Uneven Cooling (Heat Rises)

    If you don't have A/C, put exhaust fans in the top floor ceiling or windows, and open your basement windows so the cooler air is sucked upward while the warmer air is blown outside. (If you put in an automatic exhaust fan, make sure it has a high-temperature cut-out switch to prevent the spread...
  4. RJVAN

    Cavitation in a Valve

    I am beginning design on a valve intended to feed/expand liquids (like NH3) from subcooled liquid state to saturated or mixed state. I expect there will be some cavitation, but of course I'd like to minimize it. Can anyone recommend good sources to give me background (either empirical or...
  5. RJVAN

    Cavitation in a Valve

    I am beginning design on a valve intended to feed/expand liquids (like NH3) from subcooled liquid state to saturated or mixed state. I expect there will be some cavitation, but of course I'd like to minimize it. Can anyone recommend good sources to give me background (either empirical or...
  6. RJVAN

    HAS ANYONE HAD ANY EXPERIENCE WITH EPR VALVES ON A/C SYSTEMS

    I've seen EPRs used in combination with TXVs in commercial refrigeration. This arrangement is used when several evaporators exit to a common manifold. Each evaporator can then be controlled to a different pressure by the EPR, but the TXV must be properly adjusted. One disadvantage to the...
  7. RJVAN

    residential a/c efficiency help for dummies

    If I understand the condenser configuration, the air is drawn through the cooling coil and then up through the fan. By spraying water on the coil, you'll get moist air and some droplets continually pulled through the fan's motor. While the fan/motor unit is protected from rain water from above...

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