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Recent content by MrReds

  1. MrReds

    Water in a refrigeration cycle

    Hi Everybody, hope somebody can help me. I tried to search in old post but without success. I am trying to calculate some heat exchangers where water is utilized as refrigerant, that is: enters in the condenser as steam and condenses and it is evaporated in the evaporator (enters as water...
  2. MrReds

    pressure drop formula steam

    Sorry Mr. Katamar, I'll try to be more precise: in the system there are - a first part where stem goes into a tube, exchanges heat and becames water. I need to calculate the pressure drop in this first part - in the second part, the water goes into a second tube, it is heated and therefore...
  3. MrReds

    pressure drop formula steam

    Hello Everybody, Please, I’d need some help from somebody Question may seem odd, but I have not found any literature reference neither past post has been useful. I have to calculate the pressure drop of a flux of water steam that condenses and becomes liquid water and a flux of water that...
  4. MrReds

    micro - mini - channels

    Hello Everybody ! Please, I'd need somebody put me things straight concerning definition of microchannels minichannels microtubes exc is there a reference dimension under which a tube can be defined a micro tube and over which is a tube ? which is the difference between micro channels and mini...
  5. MrReds

    friction factor and materials

    Hi all ! I am sorry to disturb you with a so banal question, but I'd need your help to clarify a basic doubt. This doubt is: if I use f = 0.046/Re^(-0.2) to calculate the friction factor, this factor is independent by tube material. This means that if I use this formula, if I have the same...
  6. MrReds

    radiators for domestic heating - thermosyphons

    Sorry for not being precise. I am referring to thermosyphoning utilized for domestic heating. That is: you have a pump that makes hot water pass into tubes. Outside of this tubes, there is air that is made warmer by the heat of the water into the tubes. It is what is generally used in houses...
  7. MrReds

    radiators for domestic heating - thermosyphons

    Hi everybody ! I am contacting you concerning this issue: Is there, according to your knowledge, ad advised water velocity in a radiator used for domestic heating - the thermosyphons -? Should it be high, so that we get an higher internal heat transfer coefficient, or low, so that it would...
  8. MrReds

    Pulse Bruel

    Many thanks Greg. We are looking for a device for realizing a sound measurement in a anecoic room & to realize vibration tests. the method is to measure sound power. Cheers
  9. MrReds

    Compressed air

    many thanks Mr. SrFish The heat exchanger producers I've contacted are not able to calculate the heat exchanger. I suppose that the reason is that they are used - or they have got correlations - for traditional refrigerants. Mr. Crjones could you kindly suggest me any useful link ?
  10. MrReds

    Pulse Bruel

    hallo everybody my company is evaluating to buy a Pulse system from B&K to realize sound measurement. Please, does anybody utilizes it ? Could anybody suggest me any alternative ? Could anybody suggest me any link to see valid comments about this system ? Thanks in advance !
  11. MrReds

    Compressed air

    I would like to thank you all for your answers. Sorry for the delay of answers but all possible crashes occured in my PC ! Mr Crjones: I haven't got a receiver in the system. Mr. TBP: unfortunately the heat exchanger manufatures contacted consider this kind of application unusual for their...
  12. MrReds

    Compressed air

    Hallo to everybody. I am facing to following problem: I have to calculate an heat exchanger to reduce temperature of compressed air. Please, I’d like to know if, according to your knowledge, there is something that differs from traditional heat exchanger dimensioning. Are there further...
  13. MrReds

    Log mean TD

    Hallo to everybody Please, I would be grateful if someone of you could help me in following issue: I am dealing with this issue, that it can be apparently simple, but I cannot find any reference about it. In an heat exchanger, when defining logarithmic mean temperature, Th1 = inlet...
  14. MrReds

    Dry Coolers and condensers capacity

    Sorry Just to make a clarification: For dry coolers I mean water coolers. When I ask : do you know a method to calculate capacity of these water coolers, I forgot to specify: "In a condition different than a specified one" Sorry for not being clear !
  15. MrReds

    Dry Coolers and condensers capacity

    Hallo to everybody ! I have realized a research but I have not found anything useful about following issue in the previous posts. Therefore, I would be grateful if somebody could help me: For the condensers you can generally give the capacity in a standard condition and then you can analyze...
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