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Recent content by AO1958
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Air and Nytrogen
Many thanks Mr. Latexman- AO1958
- Post #3
- Forum: Heat Transfer & Thermodynamics engineering
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Air and Nytrogen
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- AO1958
- Thread
- Replies: 3
- Forum: Heat Transfer & Thermodynamics engineering
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cooling coil
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...- AO1958
- Thread
- Replies: 1
- Forum: HVAC/R engineering
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fan curves, volumetric air flow, temperature
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...- AO1958
- Thread
- Replies: 2
- Forum: Pump engineering
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Free Cooling
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- AO1958
- Post #9
- Forum: Heat Transfer & Thermodynamics engineering
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Free Cooling
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 -...- AO1958
- Post #6
- Forum: Heat Transfer & Thermodynamics engineering
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Free Cooling
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- AO1958
- Post #4
- Forum: Heat Transfer & Thermodynamics engineering
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Free Cooling
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...- AO1958
- Thread
- Replies: 8
- Forum: Heat Transfer & Thermodynamics engineering
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fritcion factors, materials
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 -...- AO1958
- Thread
- Replies: 5
- Forum: Pipelines, Piping and Fluid Mechanics engineering
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Heat exchanger topic F value
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...- AO1958
- Thread
- Replies: 2
- Forum: Heat Transfer & Thermodynamics engineering
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Oil data reduction
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...- AO1958
- Thread
- Replies: 2
- Forum: Heat Transfer & Thermodynamics engineering
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Ammonia and stainless steel, corrosion
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...- AO1958
- Post #6
- Forum: Corrosion engineering
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Ammonia and stainless steel, corrosion
Many thanks Mr.blacksmith37 Therefore may I understand that water in NH3 somehow improves stainless steel corrosion resistance ? Many thanks- AO1958
- Post #3
- Forum: Corrosion engineering
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Ammonia and stainless steel, corrosion
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...- AO1958
- Thread
- Replies: 6
- Forum: Corrosion engineering
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Vibration with axial fan
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...- AO1958
- Post #6
- Forum: Mechanical Acoustics/Vibration engineering
