All times are UTC + 8 hours




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Apr 17th, '16, 06:58 
Offline

Joined: Apr 17th, '16, 06:35
Posts: 4
Gender: Male
Are you human?: yes
Location: Austin/Houson, TX USA
Hi everyone,

What is the fraction of pumping capacity used to operate a pump at max (energy) efficiency?

Assumptions: Continuous flow system, media bed, inline pump, volume of bed and rate of pumping is known.

To rephrase my question, hypothetically, if I had to pump 100 gal/hr of water (in a tank) up 4 feet, what size/power pump should I get?

Thanks!


Top
 Profile  
Reply with quote  
    Advertisement
 
PostPosted: Apr 17th, '16, 11:03 
Offline
Valued Contributor
Valued Contributor

Joined: Aug 30th, '15, 11:48
Posts: 85
Gender: Male
Are you human?: Yes
Location: Northern california, usa
The pump should have a chart that tells you how much water it will pump at various head (height).


Top
 Profile  
Reply with quote  
PostPosted: Apr 17th, '16, 11:34 
Offline

Joined: Apr 17th, '16, 06:35
Posts: 4
Gender: Male
Are you human?: yes
Location: Austin/Houson, TX USA
Ace wrote:
The pump should have a chart that tells you how much water it will pump at various head (height).

Are you sure that the chart lists those pumping rates for max efficiency? I assumed those only told the pumping abilities.


Top
 Profile  
Reply with quote  
PostPosted: Apr 17th, '16, 11:38 
Offline

Joined: Apr 17th, '16, 06:35
Posts: 4
Gender: Male
Are you human?: yes
Location: Austin/Houson, TX USA
TLy693 wrote:
To rephrase my question, hypothetically, if I had to pump 100 gal/hr of water (in a tank) up 4 feet, what size/power pump should I get?


I meant to say what size/power pump should I get for the best energy efficiency

I also meant to say submersible pump, NOT INLINE (oops)


Top
 Profile  
Reply with quote  
PostPosted: Apr 17th, '16, 12:08 
Offline
Valued Contributor
Valued Contributor

Joined: Aug 30th, '15, 11:48
Posts: 85
Gender: Male
Are you human?: Yes
Location: Northern california, usa
Let me start by saying that i dont know.

But it seems like when i raise the height on my pump, it just pumps less water. I ASSUME it uses the same amount of power.

I guess if i dropped my output below the input i could create a siphon and use the pump motor as a generator, which would be super efficient until i melted something or started a fire.


Top
 Profile  
Reply with quote  
PostPosted: Apr 17th, '16, 16:07 
Offline
A posting God
A posting God
User avatar

Joined: Mar 9th, '13, 10:44
Posts: 3436
Location: Loomberah NSW
Gender: Male
Are you human?: Im a force of nature
Location: I'm right here
Ace wrote:

But it seems like when i raise the height on my pump, it just pumps less water.


Correct, you will get less flow at higher heads

Quote:
I ASSUME it uses the same amount of power.


Incorrect, as you restrict the flow, or increase the head, power consumption usually decreases a bit.


Quote:
I guess if i dropped my output below the input i could create a siphon and use the pump motor as a generator, which would be super efficient


very incorrect! ;)

_________________
My small AP system: http://backyardaquaponics.com/forum/viewtopic.php?f=18&t=16345
Larger 2nd system: http://www.backyardaquaponics.com/forum/viewtopic.php?f=18&t=24153
Solar powered Gunagulla Organic Garden
Fruit +Loomberah Wx
http://gunagulla.com


Top
 Profile  
Reply with quote  
PostPosted: Apr 18th, '16, 02:35 
Offline
Valued Contributor
Valued Contributor

Joined: Aug 30th, '15, 11:48
Posts: 85
Gender: Male
Are you human?: Yes
Location: Northern california, usa
So gunagulla: for the op, is it possible to know or calculate power consumption at different flow rates for a given pump? How much does restricting the flow impact power consumption?


Top
 Profile  
Reply with quote  
PostPosted: Apr 18th, '16, 09:41 
Offline
A posting God
A posting God
User avatar

Joined: Mar 9th, '13, 10:44
Posts: 3436
Location: Loomberah NSW
Gender: Male
Are you human?: Im a force of nature
Location: I'm right here
Not for the end user, the only way is to measure it, and some manufacturers provide curves showing flow head height and power use vs flow. You can work out the efficiency at the various pumping rates/head heights from those 2 curves, and some manufacturers even give efficiency curves as well.

Restricting the flow is exactly the same as raising the outlet pipe as far as the pump is concerned- it shows as an increase in pressure at the pump outlet. Blocking the flow completely is the same as raising the outlet until there is zero flow, at which point the pump is 0% efficient, it's just churning water around the impeller housing. All the power is just being dissipated as frictional heating and noise, but power use will be less than when it is pumping a significant quantity of water.

_________________
My small AP system: http://backyardaquaponics.com/forum/viewtopic.php?f=18&t=16345
Larger 2nd system: http://www.backyardaquaponics.com/forum/viewtopic.php?f=18&t=24153
Solar powered Gunagulla Organic Garden
Fruit +Loomberah Wx
http://gunagulla.com


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 

All times are UTC + 8 hours


Who is online

Users browsing this forum: No registered users and 12 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB® Forum Software © phpBB Group
Portal by phpBB3 Portal © phpBB Türkiye
[ Time : 0.097s | 18 Queries | GZIP : Off ]