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Hello All I apologize for the delay, but was the time to have delivered a phonometer with spectrum analysis. Just to confirm that It has been measured a very high noise @ 250Hz and 500Hz - and only at these frequencies - in the new fan with respect of the old one. The difference was over 16 dB...

Hello all first of all, I'd like to thank you for your answers. @electricpete first and foremost. Yes, this fan is utilized in an equipment utilized in a closed room where people work. therefore, this is the main problem. As I wrote, having the same air flow, we have the same performance...

Hello All, hope everybody is fine. If I have posted in the wrong section, I do apologize, just suggest me the right one. Please, I would like to share with you following odd experience I am facing. I have utilized two AC 220V fans. One of them is from 2015, the other is recently manufactured...

Hello all I would like to thank you for your kind answers. I will try to answer to these questions, defining also my issues. Unfortunately, I am still stuck in defining the mathematical model. Staring with answering or commenting your posts. @1503-44 Do I simply consider the max water content...

@1503-44 Many thanks for your answer. I apologize for not having presented all the data. I fear that the case I am involved is more complex. Just to present you some numbers. Compressed air is entering the heat exchanger at following conditions Entering @194F, 135 psig 100% RH Outlet @86F...

Hello Hope everybody is fine. Please I am contacting you for following topic. I’d need to calculate an heat exchanger that cools compressed air. Normally these calculations are realized considering dry air. In this case I need to consider relative humidity of compressed air. Therefore, if the...

Hi there Hope everybody is getting well. Please, I am contacting for following doubt concerning thermal expansion coefficient. I have searched a lot in the forum and google but I haven’t find any answer. I hope also to post in the right forum Following is the topic Let’s consider two pipes of...

Hi there Hope everybody is fine. Please, I would like to ask you an opinion concerning following odd situation I am facing. I am dealing with an air conditioning equipment water condensed. This equipment utilizes an electronic expansion valve. The thermal load at the evaporator is constant, as...

My apologizes https://files.engineering.com/getfile.aspx?folder=29e7070b-f972-43e9-938e-16180a0c6d23&file=sketch.pdf

Hello, I can't send you the original drawing, but I made a sketch, Hope this helps

Hi there Hope everybody is fine. Please I am contacting you in order to ask you an opinion about an installation I have been asked to evaluate. Point is as follows. A remote condenser in installed in an ambient with ceiling and one wall open to the outdoor, closed by a grid. This grid presents a...

Hello As a matter of fact I was trying to understand more concerning endurance engineering, and specifically neither the laws that rule this branch engineering or some specific standard where endurance is stated. I have searched a lot of standards, nonetheless the SAE is the sole one where a...

apologizes. The specific standard is J-28 42 Link the confidence is given from the formula that I wrote in the opening thread. Point is: this refers to the half of the years I would like to consider. But if you could recommend me any other standard to refer concerning durability, your are...

Hello the standard is a SAE standard Link the aim would be to realize in a third party laboratory the test. Fulfilling the points of the standard would fulfill the declared hours and years

Hello, thanks for your answer. Indeed the aim of my question was to know if it is possible, starting from the endurance stated from the standard, how to adapt the standard requisite to assure a double life. When I look at the confidence formula I would say that confidence and reliability is...

HI there Hope everybody is safe I hope to be posting in the right part of the forum, nonetheless I haven’t found a specific thread about endurance tests. Please, I am contacting you concerning following topic. A standard defines an endurance test targeted to simulate a minimum of 12 years of...

Hello I'd like to thank you for your kind answers. @mk32323 The vendor is providing only following data mass flow DP temperature relative humidity pressure (therefore density) in calibration conditions @bimr Unfortunately the supplier of nozzles can't help me since he asserts of not...

Hello There Hope you are fine. I hope to be posting my question in the right forum Please, I’d like to ask you a clarification concerning following topic. I am utilizing some calibrated nozzles in order to calculate the air flow on an equipment. These nozzles are subsonic nozzles therefore...

@ MR Itsmoked OK, I understand. Many thanks @ All I would like to thank you all for your kind and precious help. Please, if you don't mind, could you recommend me a good book where I could study on and improve my knowledge on this topic? Thanks in advance

Dear All At first please let me thank you all for your prompt, polite and expert answers. I truly appreciate your help. I really think they helped to clarify me several aspects of the topic, that at the end seems to be a forced utilization of an equipment in an environment it has not developed...