Power Consumption for the Borewell Pumps - CR4 Discussion Thread

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Anonymous Poster #1	Power Consumption for the Borewell Pumps 05/22/2020 4:51 AM
	If two different borewell pumps at different locations one with 1.5 kw at 400 ft depth and the other one with 3.75 kw at 800 ft depth operated, both having same ground water level what will be the savings expected if only 1.5 kw pump is operated.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Power consumption for the borewell pumps 05/22/2020 5:25 AM
	It depends upon the levels in each borehole above each pump and the height to which these two different <...borewell pumps...> lift; this information has been withheld from the forum. So, assuming that the figures above are the total lift in each case: The <...400 ft...> one will produce no more than _{[tap, tap, tap, press equals...]} 4.5m³/h, ignoring pump efficiency for the moment. The <...800 ft...> one will produce no more than _{[tap, tap, tap, press equals...]} 22m³/h, ignoring pump efficiency for the moment. So the water saving will be around _{[tap, tap, tap, press equals...]} 84% compared to having both pumps running. Again, ignoring efficiency and assuming the pumps are running at their rated electrical load, the power consumed will be around 28% of what it was having both pumps running, by simple arithmetic. What's the prize, please? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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pokalasrao Commentator Join Date: Jun 2008 Posts: 77	#3 In reply to #1 Re: Power consumption for the borewell pumps 05/22/2020 6:50 AM
	Savings in power consumption if 1.5 is pump is operated instead of 3.75 kw pump?
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#4 In reply to #3 Re: Power consumption for the borewell pumps 05/22/2020 2:26 PM
	Using 80% less water, you would expect lower energy consumption, but I wouldn't characterize this as saving....Now if you could supply as much water with less energy, then you would be saving....but if you don't need that much water to begin with, then you are wasting both water and energy....If on the other hand you need that much water, and are curtailing use, then you are not saving, you are sacrificing... __________________ All living things seek to control their own destiny....this is the purpose of life
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: Power consumption for the borewell pumps 05/22/2020 5:47 AM
	Why is a <...Power consumption...> thread in the Mechanical Engineering section? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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The Prof Guru Join Date: Aug 2006 Location: Western Australia Posts: 767 Good Answers: 58	#5 Re: Power Consumption for the Borewell Pumps 05/24/2020 6:19 AM
	Question is a bit vague as you do not say whether the powers you have given are the "size" of the motors or the drawn power, but if the groundwater level is the same for each pump then the differential head will be the same for each pump. Power = þghQ. Specific gravity (Rho), g and total head are all equal, so Q is the only variable. If the pumps are identical then Q is also equal. 3.75 - 1.5 = ? __________________ If you can't explain it simply, you don't understand it well enough. (A.E.)
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Users who posted comments:

pokalasrao (1); PWSlack (2); SolarEagle (1); The Prof (1)

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