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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 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...

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...

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 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...

Hello Everybody Hope you are fine and safe Please, I apologize for the most experts, but it has passed a long time since I dealt with electricity lessons as well I am not an expert so that I kindly ask for your help. I have red this thread, too...

HI there Hope everybody is safe Please, i am facing to a very puzzling problem. I need to have a kind piece of advice concerning an ducted air conditioning equipment utilizing a radial fan. Air flow estimated is around 8000 ft³/m The equipment is whistling when the fan speed is low, and the...

HI there hope everybody is safe as well as all your beloved. Please, I'd kindly need a piece of information my question is as follows I have available the coefficients of absorbtion of sabine for an insulating material having a thickness A Should I take two times this insulating material...

Hi there hope everybody is safe in this period Please, I'd need a piece of advice from you. I need to select a suitable pipe material for a aqueous solution containing o chloride 1100 mg / L o sulfate 1200 mg / L This pipe will be utilized in an heat exchanger. The circuit would be closed...

Hi Hope you are fine and safe. Please, I am dealing with following problem, and I’d kindly need some pieces of advice. I have a finned tube that is inserted in a tank full of water. The purpose of this finned tube is to cool the water of the tank Into this finned tube passes refrigerant at a...

Hi there hope everybody is fine. Please, I’d like to clarify a doubt concerning the cooling time to lower the temperature of air in a room from Ta to Tb. I have looked in past posts but without finding an answer to my questions, so that I would be grateful if you could help me. My...

Hi there Hope everybody is fine I hope I am posting in the right forum, since this is a cross topic question Please I’d need an help from you Following is the topic I need to select an heat exchanger in order to cool down temperature of distilled water utilized to cool an electrical generator...

Hello Hope everybody is fine. Please I’d like to ask you an opinion about following concern I have an aluminum tube coupled with a galvanized steel end plate. The area of contact is of 1mm ca. This assembly undergoes a combined swat (therefore Solphures) and salty fog test (therefore...

Hi there I’d kindly need some help for following topic. I’d need to verify a pressure vessel for a design temperature higher than material creep temperature,ex 410F. Question 1) Do you think it is feasible ? My understanding is that this is possible, but a specific number of hours, or cycles...

Hi there Hope everybody is fine. I am here contacting you in order to clarify a big doubt I have concerning a test to realize. Following is the topic. I’ll try the best to explain it, since it is not simple: We have in a closed test room an air-air heat pump, that works with refrigerant...

Hi There Hope to write in the right forum I am here dealing with a special topic. I need to realize a corrosion test of an heat exchanger, and the duration is determined by weibull distribution. My question is: is there any recommended value for Weibull slope ? I assume it is higher than one...

Hi there Hope you are fine. Happy new year to everyone !!! Please, I hope somebody can help me in following topic. I need to dimension a blast chiller in order to cool some meat – beef - entering at 104F. I need to freeze it at -4F. This means I can realize an evaporation @...

Hi there Hope you are fine. Please, I’d like to know if somebody can help me in following topic. Is there a formula or a rule of thumb that can convert the absorbed power of an electrical equipment to the heat that it produces ? To make an example: Let’s assume I have an electrical motor that...