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Recent content by Yorkman

  1. Yorkman

    float switches

    Warrick also makes an electronic probe/level control that we use in cooling tower basins. We use them to cycle make up water soleniods and trigger high and low level alarms, it could be used to cylce a pump as well. I'm not a real engineer, but I play one on T.V. A.J. Gest, York Int./JCI
  2. Yorkman

    Air Dryer heat release

    If the driers are air cooled, for every 12,000 BTU/hr of heat removed from the compressed air process you will reject about 15,000 Btu/hr into the space. I'm not a real engineer, but I play one on T.V. A.J. Gest, York Int./JCI
  3. Yorkman

    1000 Ton CHiller with VSD...

    You did'nt say was this machine a YK high pressure? I assume so. One issue to look at is as the load drops on the machine and the VSD slows motor RPM down the condenser water temps. need to be lowered also so that stall and surging can be avoided. Excess suging can lead to premature thrust...
  4. Yorkman

    Expansion Loops on pipe rack

    ASHRAE published several equations to calculate the width and depth of an expansion loop in their 2004 HVAC Systems and equipment Handbook Chpt 41.12. The equation I've seen used for temps up to 400[°]F was this L=6.225[√]([Δ]G x D) L/5=W 2W=H Where: L=growth factor 6.225=...
  5. Yorkman

    Flywheel in relation to water systems

    Justincase, I think you maybe misunderstanding what your instructor means by referencing water as a refrigerant and what the posting means by high heat capacity. I think your instructor is refering to the latent heat of vaporization of water, and it's use as a refrigerant in absorbtion...
  6. Yorkman

    Flywheel in relation to water systems

    I'm not sure what you mean by flywheel but if you mean system volume VS. tons of cooling. Usually a min. of 3-5 gallons per ton of cooling is what York has as a recommendation for comfort cooling and as much as 8 gallons per ton for process cooling. The idea is to increase system stability and...
  7. Yorkman

    Refrigerant monitor to affect Boiler operation

    Denver Colo. City code says that if a refrigeration system could possible dump it's charge or develope a leak that could find it's way to an open flame the refrigerant monitor must be wire so as to shut down the open flame appliance in the event of a large level leak/spill. This can add...
  8. Yorkman

    DISCHARGE TEMP ON AIR COOLED RECIPROCATING CHILLER

    Gepman is right on target, what your concerned with is the temperature of the oil, most mineral oils start to burn/breakdown at 300-350 degrees F. Synthetic oils which is what you will see in R-134a and most 400 series blends don't actually break down at these temperatures but loose their...
  9. Yorkman

    Coil Leaving Air Temperature

    HVACHawaii, I teach apprenticeship/journeymen classes in advanced psychrometrics, and found your postings a typical problem with systems trying to control dehumidification and reheat. Could I ask you to post a few more details regarding the room/space conditions, so that I might include it as...
  10. Yorkman

    Coil Leaving Air Temperature

    I figure it's worth mentioning, if the coil is not piped in a counterflow configuration it can increase the approach of the coil. Chilled water supply should enter on the leaving air side of the coil,to get the most efficiency out of the coil. It would'nt be the first time this type of piping...
  11. Yorkman

    Centrifugal Compressor Performance Curves

    Lou, Sorry about the late response. Your pretty limited in lowering the compression ratio after that. You might want to make sure that the hot gas bypass is tuned or calibrated to energize at the correct time/pressure usualy a function of evaporator pressure. Also making sure that you're running...
  12. Yorkman

    Pressure measurements using a closed tub manometer (barometer)

    If the two tubes were not completely filled to the top before turning over and placing into the resevoir, the gas inside the tube would travel to the enclosed end and would actually be under atmospheric pressure acting on the resevoir, less the static pressure due to the column of water. To...
  13. Yorkman

    Centrifugal Compressor Performance Curves

    With a centrifugal pump lowering discharge pressure can be related to a reduction in pressure drop/friction; increasing pump flow, increasing amperage. Don't forget you are imparting energy to a non-compressible liquid. With a centrifual compressor your compressing a gas so that it can be...
  14. Yorkman

    Chilled water expnsion tank commissioning.

    The term expansion tank can describe several type of systems the original type of expansion tanks were open to atmosphere, and the tank was located at the highest point in the system. If this is a closed system, it is probably a compression tank. If the compression tank is of the rubber...
  15. Yorkman

    buried pipes heat transfer

    Usually slowing down a glycol fluid will adversly affect the mass rate of heat transfer at the chiller. You may expierence shut downs on low evap. pressure cutout, or low leaving solution temperature. These operating safeties may need to be lowered if you slow down the rate of circulation. This...
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