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Energy saving calculation

Created by: Shahide043 at: 1/16/2013 8:19 AM (7 Replies)

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1/16/2013 8:19 AM	Rate (0)
Shahide043 Posts: 57 Rating: (0)	Hi Everybody, How much energy are we going to save if we run a 132 KW motor for pump application at full rated rpm by a sinamics G-120 drive instead of DOL.Please give the calculations in detail. Thanks & Regards Shahid
Shahide043 Posts: 57 Rating: (0)
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1/17/2013 3:58 PM	Rate (0)
Deleted User Posts: 767 Rating: (69)	Hello Shahide043, For any meaningful calculation to be estimated there must be data such as amount of time duty periods during a 24 hour day that the pump is operated at a reduced flow rate. For instance, if in a current system you have a throttle valve where fluids are being pumped to reduce the flow rate to 80%. This reduction in flow rate would be the opportunity to save energy by eliminating the throttle valve and using a variable frequency drive to provide needed flow rate by changing motor speed. (For 80% of a rated speed 1800 rpm motor would be 1440 rpm). Deputy
Deleted User Posts: 767 Rating: (69)
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1/17/2013 8:22 PM	Rate (0)
DenisMor Posts: 344 Rating: (50)	Take a look at energy savings calculators.
DenisMor Posts: 344 Rating: (50)
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This contribution was helpful to 3 thankful Users dchartier rmb_cardoso Ashutosh Kr

1/18/2013 6:06 AM	Rate (0)
pradip_a Posts: 2 Rating: (0)	Also it important to know the load beheviour is CT or VT.In VT (variable torque) u get good savings than CT (constant torque)
pradip_a Posts: 2 Rating: (0)
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1/19/2013 7:24 AM	Rate (0)
Shahide043 Posts: 57 Rating: (0)	Dear Sir, I too agree with your answer that a DOL cannot control the speed in other words rate of flow where the rate of flow is controlled by the throttle valve whereas the drive can control the rate of flow by varying the speed of motor.My question was "How much energy are we going to save if we run a 132 KW motor for 24 hour for constant flow for the pump application at full rated rpm by a sinamics G-120 drive instead of DOL.Please give the calculations in detail." I hope my query is clear now? Thanks & Regards Shahide043
Shahide043 Posts: 57 Rating: (0)
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6/29/2013 7:01 AM	Rate (0)
Vithani Platinum Member Joined: 7/8/2009 Last visit: 8/5/2024 Posts: 1976 Rating: (477)	Shahide043 Dear Sir, I too agree with your answer that a DOL cannot control the speed in other words rate of flow where the rate of flow is controlled by the throttle valve whereas the drive can control the rate of flow by varying the speed of motor.My question was "How much energy are we going to save if we run a 132 KW motor for 24 hour for constant flow for the pump application at full rated rpm by a sinamics G-120 drive instead of DOL.Please give the calculations in detail." I hope my query is clear now? Thanks & Regards Shahide043 Hello Shahide043 Link posted by DenisMorcan calculate energy saving as you want And I want to add that Your power factor will improve so you will save energy in that case also Your input current will be lower because you need to supply only active power so your energy saving will be done in this regards too Regards, Devesh
	I dont Like people driving Fast, thats the reason I overtake them ;)
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6/29/2013 7:56 AM	Rate (0)
Shahide043 Posts: 57 Rating: (0)	Dear all, Thanks for ur valuable answers & suggestions. Regards Shahide043
Shahide043 Posts: 57 Rating: (0)
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This contribution was helpful to 1 thankful Users Vithani

6/29/2013 1:25 PM	Rate (0)
N. Vijay Silver Member Joined: 3/17/2013 Last visit: 8/25/2024 Posts: 481 Rating: (43)	Hi Apart from other replies, you need not run the motor at full speed always. There shall be a process controlling element (depends on your process like feed rate or pressure.etc) to reduce speed in case full rpm is not required. Then ES will be more effective (lesser speed lesser motor voltage...) apart from other benefits of VFD like motor winding stress reduction, efficiency, better pf... regards, Vijay

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