EcoRenovator - View Single Post - Designing an Advanced Heat Pump Controller

takyka · 07-23-14, 01:54 AM

Hi,

The use of 3phase AC motors is a small step towards higher efficiency.
One problem, if you run a motor with VFD on 100% it is less efficient than the single phase counterpart. This is due the losses of the VFD.
Other issue is, BLDC motors are more effective. :-)
For circulation pump it's easy you can't beat (in price, simplicity and efficiency) the off the shelf units like Grundfos Alpha2
http://net.grundfos.com/Appl/WebCAPS...re-4352964.pdf
You can get 1/2-1/3 electric consumption from it than a single phase ac pump.
Biger problem to get BLDC (non circulation)pump, compressor and fan motor. I don't know if those are available as standard products...

VFDs are available from as small as 100W. I run my well pump from a 400W VFD on 23Hz, for passive cooling purposes.
http://ecorenovator.org/forum/attach...pfirsttest-jpg rightmost device in electrical box.

T.

07-23-14, 01:54 AM	#7
takyka Helper EcoRenovator Join Date: Jul 2014 Location: Hungary Posts: 34 Thanks: 0 Thanked 16 Times in 10 Posts	Hi, The use of 3phase AC motors is a small step towards higher efficiency. One problem, if you run a motor with VFD on 100% it is less efficient than the single phase counterpart. This is due the losses of the VFD. Other issue is, BLDC motors are more effective. :-) For circulation pump it's easy you can't beat (in price, simplicity and efficiency) the off the shelf units like Grundfos Alpha2 http://net.grundfos.com/Appl/WebCAPS...re-4352964.pdf You can get 1/2-1/3 electric consumption from it than a single phase ac pump. Biger problem to get BLDC (non circulation)pump, compressor and fan motor. I don't know if those are available as standard products... VFDs are available from as small as 100W. I run my well pump from a 400W VFD on 23Hz, for passive cooling purposes. http://ecorenovator.org/forum/attach...pfirsttest-jpg rightmost device in electrical box. T.