Cooling System for Fluid Power Applications
Cooling System for Fluid Power Applications
(OP)
Hello Guys,
I am beginner in designing fluid power applicaton. I need your expertise advice for the problem we have now.
We are designing some electrohydraulic system for spooling cable. The system will equiped with 2 discbrakes for controlling the cable tension, Hydraulic accumulator, one hydraulic motor, one hydraulic pump & 11 kW electric motor as power source.
The system almost finish unless the heat exchangers for cooling system.
I have no idea to size the cooling system.
We planned to make some air cooled HE, with fan installed on shaft of Elect. Motor & Hyd. Pump. And Circular tubing with fin at the outer side of fan. The size of tubing is about 1/2 " ID.
I need some formula to size the diameter of circular tubing and how much circle i should build.
(The power loss which is converted to heat, estimated will be about 25 % of Power Supply (2.75 kW))
I am beginner in designing fluid power applicaton. I need your expertise advice for the problem we have now.
We are designing some electrohydraulic system for spooling cable. The system will equiped with 2 discbrakes for controlling the cable tension, Hydraulic accumulator, one hydraulic motor, one hydraulic pump & 11 kW electric motor as power source.
The system almost finish unless the heat exchangers for cooling system.
I have no idea to size the cooling system.
We planned to make some air cooled HE, with fan installed on shaft of Elect. Motor & Hyd. Pump. And Circular tubing with fin at the outer side of fan. The size of tubing is about 1/2 " ID.
I need some formula to size the diameter of circular tubing and how much circle i should build.
(The power loss which is converted to heat, estimated will be about 25 % of Power Supply (2.75 kW))





RE: Cooling System for Fluid Power Applications
Try the following site for coolers:
www.boschrexroth.com
Hope this helps.
saxon
RE: Cooling System for Fluid Power Applications
Have you considered eddy current retarders with torque control (set up like a dynomometer) for the tensioning hold back instead of disc brakes?
I have seen it done, and the flywheels of the eddy current retarders dissapate the heat of the braking.
rmw
RE: Cooling System for Fluid Power Applications
BUY a heat exchanger, large enough to dissipate all the heat that the motor could possibly add.
You'll have trouble enough, getting the _system_ to work right, without also developing a component.
Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA
RE: Cooling System for Fluid Power Applications
http://www.magnetictech.com/index.htm
RE: Cooling System for Fluid Power Applications
That is a great site, but I notice that their maximum capability was only 140 in-lb., and suspect that 133... is looking for more capacity than that.
I was thinking more along the lines of equipment line the links below, all of which is commonly used in automotive dynamometers at torques and speeds that 133... will never get to.
I once did a project like this, and this for highline tensioning for a company out in Utah, I think it was, and it worked well.
Some links are:
http://www.zelusl.com/
http://www.tmm.es/webtmmi/default.htm c... on products, click on retarders.
http://www.dynocomp.com/tuner.php
This ought to give a direction to start out on if 133... is interested in this approach.
rmw
RE: Cooling System for Fluid Power Applications
Appreciate bringing me up to speed. I just remember them being used and didn’t stop to look at the physicals.
Take a look at the picture on the lower right side. This is a an Aluminum Beam filled with synthetic yard and in our case weighs in at 2200 lbs when full. You have gotten me thinking was this tensioning device coupled through a gear box.
http://www.magnetictech.com/applications.htm
RE: Cooling System for Fluid Power Applications
I forget to told you about time usage of equipment above, which is about 2 - 3 hours a time. rest of it, will use just about 5 % of pump power, and supplied by Accumulator.
At the first 2 -3 hours, the system filled the accumulator.
About retarders, at the first stage of designing this system, we already decided that the system will use all hydraulic power instead of electric for braking system.
Thank you
RK a.k.a 13392017