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  1. Jonkatz

    Fired heater tube fretting.

    GL, I used to design these types of heaters, are they in steam/water service or petroleum product heating? Is this "fretting" as you call it occurring on all the tubes or just a few of them? On bottom suppoted heaters, this is a normal situation - the "guides" have to be pretty tight to prevent...
  2. Jonkatz

    ASHRAE 90.1 (Non-Prescriptive)

    off the top of my head, I think for the non-prescriptive approach, you need to do a building simulation of a base building and the proposed building to demonstrate compliance - Many Software are available such as eQuest (free_, Carrier HAP, Trace, etc. These are fairly comlex programs, but its...
  3. Jonkatz

    Stacks

    All of the above definitions are correct, a stack and chimney are essentially the same. THEY ALSO serve to create a draft effect (or stack effect) by maintaining a column of hot gas above a combustion chamber for instance. THis so-called "stack-effect" creates the needed pressure...
  4. Jonkatz

    Need advice on using HVAC system for part of a building

    Hello, A few thoughts you may want to consider: 1. Consider installaing VAV terminal boxes to control the variable speed supply fan. In this case, the VFD for the small Hot water pump won't be necessary. This may be a cheaper option and will probably result in MORE energy savings because 75 HP...
  5. Jonkatz

    Design standard for flues and ducts?

    MrStrohler, Now I think I understand your question better. Allowable stresses for all boiler materials are tabulated in the BPV -section 2 (materials) I beleive. The stress tables in the BPV utilize ASTM designations, so if you have a steel plate material, you can look up the allowable stress...
  6. Jonkatz

    Design standard for flues and ducts?

    MrStrohler, In most cases I am familiar with, the air/flue gas ducts you are interested in are within the boiler vendor's scope up to some agreed connection point. For example, the economizer outlet may be the cut-off and then the stack vendor may take over - or the EPC company. So ducts are...
  7. Jonkatz

    Cooling Tower VFD energy savings

    This is for a HVAC application - cooling tower serves a 125 ton electric chiller. JK
  8. Jonkatz

    Cooling Tower VFD energy savings

    Can anyone suggest a resource or methodology about how to calculate the energy savings acheived by replacing a constant fan speed cooling tower with a VFD controlled cooling tower ? THANKS - JK
  9. Jonkatz

    Methane Vs Ethane

    Falcon, Since Methane is about half as dense as Ethane, the gas pressure would theoretically need to be Doubled to keep the same SCF through the burner piping. BUt you should check what the max pressure the burner system can handle. Then, the control valves should be re-sized and an...
  10. Jonkatz

    Fired Heater Optimization

    For Fired Heater optimization and Basics, I recommend reading the now classic, "Furnace Operations" by Robert D. Reed.
  11. Jonkatz

    AC PLANT DESIGN

    For rough sizing purposes, 250-300 sq.ft/ton is probably safe for the application, BUT as others have said, a proper load calculation should be performed to ensure sufficienct cooling capacity and dehumidifcation. J. KAtz
  12. Jonkatz

    Sparger design in fermenter

    Does anyone know of a supplier or company who could design and provide a sparger to meet certain requirements? Anyone have experience designing/using spargers to heat a boiler using 250 psig steam? Any other resources would be helpful. THANKS Jon Katz
  13. Jonkatz

    External Fins for Heat Transfer

    Is this for outdoor use or indoor use? If you expect the fins to hold up to weathering, its best to use a corrosion resistant material (i.e. stainless steel or such) If contact with water is not expected and temperatures permits you could use medium carbon steel fins. If you expect high fin...
  14. Jonkatz

    3 Boilers versus 12 What is the best choice

    MOst heating plants I've seen use 3 or 4 boilers or hot water generators. (12) will for sure be harder to control, harder to maintain ( and just unneccessary in my view) Not to mention will end up being considerably more expensive most likely. j. katz
  15. Jonkatz

    Efficiency Impact Associated with a change of fuel on a steam boiler p

    THere are a number of variables that DIRECTLY affect the FUEL efficiency of a steam boiler so its hard to compare simplisticly Oil vs Gas only, depending on the specific composition of an Oil vs the fuel gas, the efficiency could be lower/higher in one vs the other... But they shouldn't vary by...
  16. Jonkatz

    Performance evaluation of a thermal oil heater

    I am trying to understand your problem better. If I interpret correctly, the arrangment of this heater is: a Dual Helical coil heater, fired from the top, THe radiant section is the contained by the Helical coils? Where is the "convection section" - is there a seperate bank of...
  17. Jonkatz

    Heat Equation

    This equation is essentially a statement of the first law of thermodynamics in terms of Avg. Cp (rather than enthalpies). Heat input (Q) = (Heat absorbed). -j.katz
  18. Jonkatz

    Performance evaluation of a thermal oil heater

    What is the function of this heater? What type of OIL is being heated? Is this an OLD heater? Air and Flue gas enthalpies can be taken from any number of Eng. handbooks and will be equally accurate enough for what your trying to do. Maxwell's Hydrocarbon HAndbook has curves for both. If you can...
  19. Jonkatz

    looking for the best handbook in mechanical engineering

    I have found the the Standard Handbook of Engineering Calculations" by HICKS to be quite useful. IT covers Such a broad range of topics, you can find a great deal of info in it. thanks for the idea ksuengrng, I never thought to check e-bay for engineering books. -j. katz
  20. Jonkatz

    Performance evaluation of a thermal oil heater

    From the way you phrase the question, I assume that you have an operating furnace, and are trying to benchmark the performance? If that is the case, the you can determine the efficiency of the heater by accurately measuring the following with thermocouple and Flue gas analyzer: - Flue Gas temp...

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