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  1. homerphish

    Chiller Testing Prior to Tie-in to Existing System

    imok2, The website you refer to seems to be only for computer simulations of building loads for the purpose of chiller selection and design. Our chillers are already installed. I need to somehow simulate the building load on the chilled water system for our commissioning and functional...
  2. homerphish

    Chiller Testing Prior to Tie-in to Existing System

    I've got 5 brand new Trane Centrifugal chillers in a new central plant that we've constructed for an office building. I have to do a majority of the chiller commissioning prior to tying the new system into the existing chilled water riser. Does anyone know of any ways to simulate building...
  3. homerphish

    Pressure Testing Standards for 18 gauge Welded Duct

    Does anyone know what the pressure testing standard is for 18 gauge welded duct?
  4. homerphish

    CO2 lines

    Anyone know where I can find a chart for sizing the lines in a CO2 cascading system?
  5. homerphish

    Horizontal Recirculator Capacity

    I've tried Evapco's RVS catalog and Frick's as well, but their vessels aren't nearly as long as the one that we have.
  6. homerphish

    Horizontal Recirculator Capacity

    Does anyone know how to determine the max capacity of a horizontal recircualtor package that's 60" x 18', operating at -35 degees F, with a 4:1 recirc rate and wet return connections on opposite ends of the vessel. The refrigerant used is NH3.
  7. homerphish

    Falling Film Heat Exchanger

    What would some of the advantages and disadvantages be of running pumped liquid ammonia to a falling film heat exchanger instead of going flooded with a surge drum?
  8. homerphish

    CO2 Charts

    Does anyone know where I can find some pressure temperature charts, and some pressure enthalpy tables for R-744 (CO2)?
  9. homerphish

    Two Stroke Cylinder Gaskets

    At the head.
  10. homerphish

    Two Stroke Cylinder Gaskets

    Are there any materials that are better than copper alloy when used as a gasket in a motorcycle engine cylinder? Preferably something softer or more ductile than copper, but with the same heat resistant properties.
  11. homerphish

    Aluminum Pistons

    Is 850.0 T-5 Aluminum Alloy a reasonable choice for a two stroke engine piston? If so, would it be sand cast or permanent mold cast?
  12. homerphish

    ANSI K61.1

    Does anyone know the details behind ANSI K61.1 - Safety Requirements for Storage of Anhydrous Ammonia. (1989) What standards does it require?
  13. homerphish

    Primary Flange Rating

    What is the Flange ANSI Primary Rating? I'm pretty sure that our flanges are rated for 3000 psi. Does this sound reasonable?
  14. homerphish

    RT / UT %

    What does "RT / UT % per welder" mean in reference to welding? What do RT and UT stand for?
  15. homerphish

    Thawing Frozen Ground

    The ground has finally been thawed. After drilling a grid of holes every four feet or so and filling them with circuited propylene glycol tubing, we finally got the ground thawed and leveled. For those Guinness enthusiasts out there, the overall depth of the freeze was approximately 37 ft...
  16. homerphish

    Thermal Diffusivity

    How can I figure out how long it will take to thaw out an 8'x8' plot of mud 17' deep. I have 100 degree F air above it and the mud is probably 0 degrees with thermal conductivity of 0.62. Is there any way to calculate how long the heat transfer would take to bring the mud temperature to 32...
  17. homerphish

    Thawing Frozen Ground

    Is there a way to calculate how long it takes to thaw out a certain section of frozen mud? We have some frozen ground preventing us from continuing our build, and I was wondering if there was someway to quickly thaw it out? Has anyone experienced this before?
  18. homerphish

    Vapor Pressure

    I need to reverse the equation, becasue I have 60,000 data points from a pressure sensor and I want to include the saturated temperatures for these pressures in my data to check the accuracy of the temperature sensors. THe only way to get this, aside from using a chart and individually inputing...
  19. homerphish

    Vapor Pressure

    I konw that the formula to get the vapor pressure of a refrigerant from the temperature is log P=A+B/T+ClogT+DT+ET^2+FT^3 Where A-F are constants dependent on the refrigerant.Does anyone know how to reverse this equation to get T in terms of P?
  20. homerphish

    Coil Tonnage

    Anyone know the formula to calculate the rating on a coil if I already know the tube diameter and length, as well as the fin size and spacing?

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