witch the better of energy saving VFD or VSD HYDRODYNAMIC
witch the better of energy saving VFD or VSD HYDRODYNAMIC
(OP)
hello
in pumping sation of oil we use a hydrodynamic fluid coupleur to change flow for pump and the driver is a HV motor (2.5 MW).so we would change the hydrodynamic coupleur by a HV variable fraquency driver. is it a good idea?and for annual energy cost witch the better?
best regards
in pumping sation of oil we use a hydrodynamic fluid coupleur to change flow for pump and the driver is a HV motor (2.5 MW).so we would change the hydrodynamic coupleur by a HV variable fraquency driver. is it a good idea?and for annual energy cost witch the better?
best regards





RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
I have yet to see a hydraulic drive that beats that.
Think about it, you first need an electric motor to run the hydraulic pump. Then, there are the losses in the pump, losses in the hydraulic motor (and possibly in the tubing between pump and motor - if there's a distance). These losses add up to at least 20%. Probably more. We do not know what equipment you have, so it is difficult to make an exact guess. But you will typically lose at least twice the energy in a hydraulic drive vs a VFD.
Then, there's the maintenance and reliability part of the story. Hydraulic drives do well in very rough environments. VFDs do better in more "civilized" environments.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
regards
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
You must have been listening to Obama when he said that he wanted to "increase the inefficiencies in our health care system"...
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
Et à vous, faycalleroi, il faut dire que la pompe n'est pas la pompe même, mais la pompe dans l'convertisseur hydraulique. Sans la convertisseur vous évitez les pertes de la même. Les pertes d'invertisseur sont beaucoup plus faibles que les pertes du convertisseur.
Why French? Because I think that faycalleroi speaks better French than English. "coupleur" and a few other characteristics are give-aways.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
Keith Cress
kcress - http://www.flaminsystems.com
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
http://www.kanitengineering.com/pdf/VOITH_Vorecon-...
Bill
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"Why not the best?"
Jimmy Carter
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
That is not bad. But if operation is across the whole speed range, a VFD is better.
I have done measurements on hydraulic drives for huge iron ore rotating kilns. There, efficiency was much worse than on page 3 in Bill's link. They were Hagglunds drives and had been chosen because of the high torque available at zero speed. I am afraid the Vorecon couldn't be used in such an application because efficiency drops to near zero (100% losses) at zero speed. I imagine that the oil would boil if one tried to start a loaded kiln with all the iron ore at the bottom. Start takes a very long time.
The efficiency of the Vorecon depends a lot on at what speed it is running. If running contibuously at around 80% rated speed, it seems to be a good choice. At lower speeds, it is not. But if it is about pumping oil, there are probably Atex restrictions and then, the hydraulic drive may be the only practical drive to use.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: witch the better of energy saving VFD or VSD HYDRODYNAMIC
Best to you,
Goober Dave
Haven't see the forum policies? Do so now: Forum Policies