# Thread: kw per ton w/vsd

1. Professional Member
Join Date
Nov 2006
Location
US
Posts
112
Post Likes

## kw per ton w/vsd

Ok formula guys, Question, to get kw per ton on a chiller with vsd. Tonnage no problem gpmXdelta p / 24 now for kw do i just use supply voltage and amp clamp on supply line or should i use the reduced volatge that the motor is running at and amp clamp on motor lead. Then is it kw/ton or ton/kw. I think I am confusing myself.

2. LOL!!!!!!!!

it is kw per ton!

.5 being good

3. funny!
I always figured since it is 746 watts per horse power and usually 1 or 1.1 hp per ton .746 kw per ton would be the best you could do!

4. then volts x amps x 1.73 div by 1000

5. you need to look at the line side of the drive and NOT the load side

there will be an energy penalty when using the drive as it consumes some power no matter how much the chiller is using and you need to include that energy in your calculations

6. Jay,

7. Professional Member
Join Date
Dec 2008
Location
Dixiana, AL
Posts
2,623
Post Likes
Originally Posted by 9675
Tonnage no problem gpmXdelta p / 24
GPM x delta T /24

8. aaaaaaaaaaaaaaaah!
T,P? same thing!!!!!!!!!!!

Originally Posted by klove
GPM x delta T /24

9. kind of neet kw per ton chart for turbocor

http://www.turbocor.com/literature/p.../aircooled.pdf

----------

10. Originally Posted by supertek65
then volts x amps x 1.73 div by 1000
don't forget to compensate for power factor...it should be close to 1.0...but it may not be!

11. Professional Member
Join Date
Nov 2006
Location
US
Posts
112
Post Likes
opps yeah delta t, ok thanks for input, how do ad for power factor of 1.0

12. Originally Posted by supertek65
Jay,

13. Originally Posted by 9675
...how do ad for power factor of 1.0
you have to have a power factor meter to measure it.

if you are just figuring things out for yourself, then just use 1.0

if you are commissioning a unit or anything like that, you will need to measure more accurately.

Page 1 of 2 12 Last

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•

## Related Forums

The place where Electrical professionals meet.