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  1. leatherneck

    Air changes for large warehouse to calculate infiltration loads

    For figuring infiltration only (not ventilation), I've used 0.5 air changes per hour for large warehouses. This is still a significant heat load.
  2. leatherneck

    use of sea water for condenser water

    Be careful of seaweed, mussels, or other growth that could clog the seawater intakes. A simple addition of chlorine at the intake should minimize problems.
  3. leatherneck

    VFD retrofit onto chiller

    I did some cursory research into this during a study for replacing (not rebuilding) a 600-ton chiller. Trane felt that a VFD was overkill because the vanes in the compressor inlet varied the load enough to reduce operating costs. Trane does not offer the VFD option. However, York claimed a...
  4. leatherneck

    External Static Pressure vs. Total Static Pressure

    ESP is the static pressure "external to the air handler" needed to overcome only the duct friction losses. You can measure this by using a Magnahelic gauge or manometer and inserting the tube in the duct in two places - after the fan discharge and at the return before it enters the...
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