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  • Users: Smokey2007
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  1. Smokey2007

    calculating for Reynalds Number

    So is it as easy as this? the following are enthalpies: Saturated Liquid (hf) 581.99 kJ/kg Saturated Vapor (hg) 2731.6 kJ/kg therefore dH = 2731.6-581.99= 2149.7 kJ/kg and this dH = amount of energy going into my oil??? if so that sounds way to...
  2. Smokey2007

    calculating for Reynalds Number

    I was thinking if i had the three Resistances, "1/hA" "x/kA" and "1/hA" than i found find U with 1/(R1+R2+R3). and then use this in the equation Q=UA(delta T). something that doesnt make sense is i have the value of BTU/hr that my heat exchanger produces, but not sure what to do with it.
  3. Smokey2007

    calculating for Reynalds Number

    i do not understand why this doesnt work. all things are a known except for the temperatures of the plate wall, as well as the fluid on the other side. i want to determine the temperature of the fluid. the process is: warm steam heats up wall, which heats liquid. For Heat Exchanger Shell...
  4. Smokey2007

    calculating for Reynalds Number

    excellent, so the "h" determined is what will allow me to get the overall heat transfer coeffiecient. not sure how it sounds 1D. i am aware i have to count for each wall. just keeping it simple here.
  5. Smokey2007

    calculating for Reynalds Number

    to clarify, i am trying to figure out how the Nusselt number fits into the overall equation for equating the Q for a system. is it as simple as this? Nusselt number = hD/k so once i have the Prandtl and Reynalds number, i can plug in the "k" and "D" and then solve for "h." and this "h" will...
  6. Smokey2007

    calculating for Reynalds Number

    Did I do this right?? all places where i put "**" are the places i did calculations or made assumptions. the rest i found online. here are my specs for a heat exchanger: surface area: 2.4sq ft capacity: 240k Btu/hr flow capacity: 24 gpm shell pipe ID: 1" tube pipe ID: 3/4" overall size...
  7. Smokey2007

    heat treatment oven

    i am attempting to build a heat treat oven and i am have some difficulties. i am looking at it to be 13"^3 that can reach 1800 F. i found that Kanthal wire that can go up to 2300ish F, but it says not to use it in an area greater than 12." should i need to worry about this? and is there a...
  8. Smokey2007

    easier than my other question

    asking a simplified question from the one yesterday. hopefully, if somebody can answer this, then i will be closer to answering the harder one, and this one does apply to my system. if this is not easier, i guess there is no hope for me :( lets assume in my heat exchanger i will have 50 PSI of...
  9. Smokey2007

    Heat Transfer Issue

    the more i look at a heat transfer book, the more i think im not approaching this right (duh, huh?). the goal is to have a 350 F heat transfer oil flow through a .5" stainless steel pipe. this pipe will tranfer energy from the oil to a solid on the other side and heat it. i would like to get...
  10. Smokey2007

    Heat Transfer Issue

    good observation, i did accidently change the thickness of the stainless steel, so .5" is correct. you said, "But, frankly, the calculations are not unreasonable, for a 300ºF delta across a 0.5" gap, particularly for your given thermal conductivity for steel. The high end is more like 70...
  11. Smokey2007

    part 2 of question

    i plan on using a tube and shell heat exchanger to heat the oil via steam. i will have another shell heat exchanger that will serve as a water cooling tower to cool the oil when needed. the goal is to keep the oil at about 350 F when it starts its journy. the oil will be at a temperature such...
  12. Smokey2007

    Heat Transfer Issue

    i will agree that at the moment i dont know much about heat transfer, kinda since i havent had a thermo class since 2000 when i was at West Point. and i specialized in managing communication networks while in the Army, so not really thermo related, but alas my job requires me to be an expert in...
  13. Smokey2007

    part 2 of question

    unotec, thanx for your response. 1. so to the first point, if i can calculate the efficiency of this system, then i can calculate the optimal Flow rate. any guess how to do this?? 2. i am still confused on this part. the purpose is to transfer heat from an oil through the stainless steel...
  14. Smokey2007

    part 2 of question

    this question is in addition to my previous one. i am really trying to understand heat transfer and after much research that has not helped me, your help would be greatly appreciated. so lets say 1,000,000 BTU/hr are being transferred from a liquid to a solid. 1. how does flow rate affect...
  15. Smokey2007

    Heat Transfer Issue

    definitely not a homework problem. i just got out of the military after attending West Point, and this is a current problem I have in my new field of work. i am designing a flusher used in the plastics business and want to be sure that the i buy a heat exchanger that will work well. the temp...
  16. Smokey2007

    Heat Transfer Issue

    Something does not appear right with my following calculations. I am trying to determine how many BTUs will be transferred in on hour through a material and I am getting a huge number. I understand as "delta T" decreases so will the number of BTUs transferred, but in its initial state, this...

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