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zakruti.com » Knowledge, science, education » The Engineering Mindset
Fan & motor CALCULATIONS, Pulley size, RPM, air flow rate cfm hvac rtu

Fan & motor CALCULATIONS, Pulley size, RPM, air flow rate cfm hvac rtu

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video description

Rating: 4.0; Vote: 1
We learn how to calculate the pulley diameters for motors and fans as well as their RPM and what the air flow rate will be. This can be applied to fans, ahu's and fan coil units within HVAC industry
Date: 2023-11-17

Comments and reviews: 13


How to choose motor size when the blower wheel material differs. It is centrifugal fan DIDW Double Inlet. Existing blower fan is made from aluminium material (67kg including shaft) which later replaced with blower fan made from mild steel material (93kg including shaft. Now how to determine the horsepower of the motor since new blower wheel will be heavier. Everything else remain same except the blower wheel weight.
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Sir i have 29 hp d engine 2200 rpm with 6 inch pulley. Tell me water fan pulley size? Because i have 8 inch water fan pulley. In this position tube well water though is best but engine on some fast speed?
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Aaaargh - Dont move the mouse like an maniac - slow and deliberate then stop. Like talking with your hands, youre talking with your mouse - annoying and pointless (excuse pun)
Cheers SG

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Good Day, I meet with a customer today and they have 3535 RPM 40HP Motor that has to drive a Roots 56 URAIL Blower. they want pulleys on both components. Can you help me out.
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Hey! I hope your new videos have a much better audio quality. I couldn't here a thigh so I'll wait till I get home to actually comment on the content.
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PS - what about calculating the ratio of motor and fan pulleys to achieve a desired CFM. Also, how to calculate existing CFM if not stated.
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If i have a 1440 RPM motor and i want 1000 RPM in my machine. So how can i reduce motor RPM?
Describe with formula please

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Thought this was how to calculate fan displacement. You already know the displacement, this is just calculating a new ratio.
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Fantastic video, maybe you could do a video on duct pressure loss calculations which ties up to fan selection. great job
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Hey can u please help me. Two fans.
2000 CFM 15 psi
200 CFM 200 psi
Which one is expensive and why.

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I have a question, what's happen if diameter of fan pulley doesn't match with diameter of pulley motor? Thanks before
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How are you measuring the pulley diameter? Bottom of the groove, the edge or with the belt on the pulleys?
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Does fan size (the diameter of the propeller) affect the airflows? How these variables correlate at each other?
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