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  1. yazguli

    pipe coating

    Thank you very much, LittleInch. And sorry to be so late to read your answer.
  2. yazguli

    pipe coating

    Hi everybody! Would you please help me to understand the terms in the attached image? Thank you a lot.
  3. yazguli

    effectiveness of a "penetrating fin"

    Edstainless Thank you for your reply As you say, acid formation is a concern and the materials must be suitable. Of course I’m not sure the leaving gas temperature is going to be less than dew point temperature. Speaking about the fins, as the h of the gas is at least ten times less than that of...
  4. yazguli

    effectiveness of a "penetrating fin"

    Thank you, every one. Let me explain what I intend to know and to do, a bit more. In fact I’m going to make a double pipe heat exchanger to recover heat from the exhaust of a diesel generator as a project for my M.Sc. experimental thesis. (Of course I’m too old to be a student, but for some...
  5. yazguli

    effectiveness of a "penetrating fin"

    IRstuff I edited my post and sent a picture.thank you for your attention.
  6. yazguli

    effectiveness of a "penetrating fin"

    Hi If you make a cut on the inner pipe of a double pipe heat exchanger or make a hole on it and attach a rectangular or a pin shaped fin on (in) it,(and of course, weld it) so that it is extended from inside of the pipe to it's outside,how would the fin effectiveness be changed? I wonder if in...
  7. yazguli

    thread403-400808 Hi A garbage chu

    thread403-400808 Hi A garbage chute duct is simultaneously subject to positive and negative pressure at sections downstream and upstream of the garbage when it is falling down. So I think it is not a good idea to install the exhaust fan on the upper end of it. Generally speaking, a separate duct...
  8. yazguli

    cooling tower question

    Thank you lilliput1 and Emrelug84 for your answers. A portion of heat transfer in cooling towers is done by sensible heat transfer ; from water to air or in the opposite direction. Typical situation is not what happens all the time.There must be such relations between parameters that when...
  9. yazguli

    cooling tower question

    Thank you for your reply,moideen; but my qusetion is :"Why it is not a concern?" Suppose in a specific condition we have a 30 degrees centigrade dry bulb air.Later it get warmer up to 40 degrees.We loose some possibility of sensible heat transfer and gain some opportunity for more latent heat...
  10. yazguli

    cooling tower question

    Hi everybody In rating a cooling tower, dry bulb temperature of air is not considered. On the other hand the ratio of latent to sensible heat transfer is dependent on it. If the thermal performance of a cooling tower is considered as the sum of its ability to sensible heat transfer and latent...
  11. yazguli

    single coil

    And of course we assume that the coil is selected to meet the cooling demands.
  12. yazguli

    single coil

    RossABQ , It's a hydronic unit and I mean a three or two way motorized valve.I think it may be possible for a control valve to regulate flow rate for both of heating and cooling , for example both 10-20 and 10-40 gpm.Of course it seems to me that a more accurate analysis is necessary.
  13. yazguli

    single coil

    Hi every body If there is no need to have cooling and heating simultaneously and if there are control valves on air handling units ,is it enough to have just a single coil for both heating and cooling?
  14. yazguli

    reverse return question

    Thank you 25362 for your attention and answers.
  15. yazguli

    reverse return question

    Thank you 25362. In central heating the pump is installed "before" or "after" heater and as you say,the expansion tank on suction of the pump. Does it make any change in your answer?
  16. yazguli

    reverse return question

    Hi In a reverse return heating system does it matter if the pump is installed on return or supply line just because it is a reverse return system?
  17. yazguli

    NPSH question

    Thank you BigInch !
  18. yazguli

    NPSH question

    Hi everybody This thread is interesting for me very much. Unfortunately I can't get Biginch's diagram.Any help please? thread407-199822
  19. yazguli

    thermosiphon question

    Thanks .Good lessons for me.
  20. yazguli

    thermosiphon question

    Thank you every body By "riser" I mean both supply and return pipes.A single supply pipe and a single return one with branches at each floor. As racookpe1978 has mentioned I have experienced cases where flow tends to stop or tries to go the wrong way. Also as btrueblood has mentioned there were...

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