- Location
- Massachusetts
Re: Single phase to three phase conversion:
SAM MAKE SPACE IN YOUR BOX
Thats your PM box.
SAM MAKE SPACE IN YOUR BOX
Thats your PM box.
Single phase to three phase conversion:
- Thread starter rattus
- Start date
- Status
stew
Senior Member
- Location
- federal way,washington
Re: Single phase to three phase conversion:
We used a rule of thumb of about 10% back in my old electric motor days.
We used a rule of thumb of about 10% back in my old electric motor days.
growler
Senior Member
- Location
- Atlanta,GA
Re: Single phase to three phase conversion:
I was just reading the original post and small dairy jumps out. What kind of load would you have there. If you milk by hand, not much. So let us assume that this is a more modern setup. You have a large milk cooler( compressor motor ), the milking machines ( I don't think this is a big one ), lights, and lots of hot water for cleaning and maybe a little heat. I would think that at least 50% of the load would not be affected by the differance of 3 phase. Maybe they checked the winter power bill against spring or summer power usage. Try and find out if they provide A/C for the cows.
I was just reading the original post and small dairy jumps out. What kind of load would you have there. If you milk by hand, not much. So let us assume that this is a more modern setup. You have a large milk cooler( compressor motor ), the milking machines ( I don't think this is a big one ), lights, and lots of hot water for cleaning and maybe a little heat. I would think that at least 50% of the load would not be affected by the differance of 3 phase. Maybe they checked the winter power bill against spring or summer power usage. Try and find out if they provide A/C for the cows.
Re: Single phase to three phase conversion:
Well for a small dairy something like less than 50 cows, there will be about 5-7 hp of condensing units to cool the milk which run for about 12 hrs a day
probably a maximum 5 hp vacuum pump running only while milking and washing (8hrs tops).
Milk pump 1/2hp runs intermittently during the 8 hrs milking.
Lights, hot water heating?? Could be using gas.
1hp well pump running 6 hrs a day.
Feeding, maybe 7.5hp feeding and conveying equipment
Manure handling Maybe 3 hp gutter cleaner motor.
None of these run over a couple hours a day.
The one thing that could have been done to save quite a bit of energy is to use a variable speed drive on the vacuum pump and reclaim the heat produced by the pump to (pre)heat the water needed for washing. The normal way of controlling the vacuum level is to run the pump at full speed and then have a controller bleed in air as needed to keep the vacuum at the setpoint. Not very effecient but very accurate and reliable.
This won't work for the most common vane type pumps, but a lobe blower is a great alternative even if it is a little noisy.
Jim
Well for a small dairy something like less than 50 cows, there will be about 5-7 hp of condensing units to cool the milk which run for about 12 hrs a day
probably a maximum 5 hp vacuum pump running only while milking and washing (8hrs tops).
Milk pump 1/2hp runs intermittently during the 8 hrs milking.
Lights, hot water heating?? Could be using gas.
1hp well pump running 6 hrs a day.
Feeding, maybe 7.5hp feeding and conveying equipment
Manure handling Maybe 3 hp gutter cleaner motor.
None of these run over a couple hours a day.
The one thing that could have been done to save quite a bit of energy is to use a variable speed drive on the vacuum pump and reclaim the heat produced by the pump to (pre)heat the water needed for washing. The normal way of controlling the vacuum level is to run the pump at full speed and then have a controller bleed in air as needed to keep the vacuum at the setpoint. Not very effecient but very accurate and reliable.
This won't work for the most common vane type pumps, but a lobe blower is a great alternative even if it is a little noisy.
Jim
- Status