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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...

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...

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...

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...

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...

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...

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...

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

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 ?

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 !

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...

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...

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...

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 !

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...

Many thanks mshimko & SJones ! Please mr. Jones, would you be so kind and putting the complete link, since I cannot download the pdf from the link you have put ! Many thanks

Hallo to everybody ! Please, I’d like to know if somebody can help me in this issue: When I consider the galvanic couple of 1) aluminum and copper, the electrode potential of aluminum is -1.66V, while copper is +0.34V. As a consequence aluminum is the less noble metal and will be subjected to...

Mr Scotty, thank you very much for your help. Please,just one more precisation. The initial question was: do you see - according to your knowledge and experience - any problem if using for control a system by one company and for acquisition a system of a different one ? Thanks in advance

Good Morning Mr. Scotty, and thanks for your answer. concerning your >You need to define your problem much more clearly in the form of a specification please not that it was not my intention to make waste time to people. Nevertheless, please, do not hesitate to ask me some elements that...

Hallo and thanks to everybody. First of all please let me send to all of you my best wishes for a wonderful and successful 2008. After receiving your great suggestion, I've been offered by following systems: Yokogawa/Eurotherm/Agilent/Siemens/National Instruments/ Does anybody of you have got...