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Many thanks Mr. Latexman

Hello hope all is fine Please, I have to realize a calculation for a Nitrogen cooler. Nonetheless I have available the sole properties of air. My question is: my I realize an approximation and consider nitrogen as dry air (that is , relative humidity = 0)? Many thanks

Hello there I am facing to following topic. Very specific, and old post can't help me, unfortunately. I am dealing with a cooling coil, and volumetric air flow at OUTLET is given to me. Known data are: - air inlet temperature - air inlet relative humidity - coil capacity It is a strange...

Hi there hope somebody could help me in following topic. Usually fan curves are provided @ 68F. In this case, with the system pressure curve, I can get a certain volumetric air flow. I am wondering if somebody could explain me what happens when ambient temperature changes. In a first...

To Mr IRStuff please, could you post an example of calculation ? It would be extremely useful for me. All in a all I am stuck to the post of Mr. TeeAr Thanks in advance

To Mr. Ione. many thanks As a matter of fact I am afraid of not understanding. If I well understand this correlation provides a Nusselt number, that is an heat exchange coefficient. Now: the problem is that I can even have the internal and external coefficient, the two heat exchange areas -...

to mr Ione. Since there is no air flow in front of the coil, I consider Cmin = 0 Please, is it wrong ? To Mr.TD2K I would be grateful if you could give me your feedback. Many thanks

Hi there, hope all is fine. Please I would have to calculate an heat exchanger in free cooling. This means that in this case there is no forced convection but only natural convection with one of the two fluids. The heat exchange is driven by the temperature difference. I suppose that...

Hi there, hope somebody could help me. I have found and red several old posts concerning pressure drop and friction factors. As a matter of fact, I am not able to find the difference between friction factors of following materials - copper - iron - carbon steel - stainless steel AISI 304 -...

Hello there I am dealing with a plate fin and tube heat exchanger. From classic thermodynamics I know that if the counterflow is perfect, I would have following equation Q = UA*LMTD In case of not perfect counterflow, I shall multiply for the F factor Q = UA*F*LMTD Let's consider a case...

Dear All, I am trying to find an equation to fit the data of oil viscosity properties. As I suppose many of you know, the main problem is due to the large excursion of values in function of temperature. I have found this interesting post thread391-287467. I have then tried to utilize the...

Hello, thanks for all your feedback. But I am afraid of not getting the point. If I have a tube in Stainless Steal (AISI 304 or 316) with some water, or water drops, and then I let ammonia passing into the same tube, is the presence of water affecting the corrosion resistance ? Is it mitigating...

Many thanks Mr.blacksmith37 Therefore may I understand that water in NH3 somehow improves stainless steel corrosion resistance ? Many thanks

Hi there, hope everything is fine. Please, I would be grateful if somebody could help me in following topic. I have red following topic thread338-273391 but I am afraid it doesn't answer completely my question. Following is the topic: Ammonia is not corrosive for stainless steel without...

Hello, many thanks for your kind answers. To Mr GregLocock post 1 I am working for the manufacturer, but I have never faced a question like this. Moreover, if you google the question, I can't fine this values specified by any manufacturer. post 2 The question is concerning the vibrations...

Hi there. please don't hate or kid me, but I am here to ask your help since I have received a more than odd question from a Customer. Following is the question. The subject is an air conditioning unit with an axial fan. My customer is asking me which is the maximum level of vibration the unit...

Hello there, I am currently designing a NH3 pump evaporator. I would have following questions. 1 - Which correlation may I utilize for calculating NH3 pressure drop ? 2 - Is there a suggested value for the pressure drop to keep ? Ex, is equivalent temperature loss similar to the one adopted...

Hi there apologizes for the banal question, but I am new to Matlab and unfortunately I have to require a kind, but quick help. I'd like to understand following topic. I have a main function in matlab, let's call it main.m Into this function there is a call to other functions, let call them...

To all, many thanks. I will apply your formulas and get back to you, should it be the case. Thanks again.

Hello thank you very much. apologizes for the delay of my answer. To Mr rmw A basic composed heat exchanger - a modular solution has been considered - considered has following design data first heat exchanger water inlet 140 F water flow 7300 gph approx second heat exchanger EG 20% inlet...