Hydraulic Cooler Sizing: Difference between revisions
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| Line 19: | Line 19: | ||
! BTU Formula | ! BTU Formula | ||
! BTU/hr | ! BTU/hr | ||
! KW Formula | |||
! KW | |||
|- | |- | ||
|28 | |28 | ||
| Line 25: | Line 27: | ||
|28 * 0.25 * 2542, 28 * 0.3 * 2542 | |28 * 0.25 * 2542, 28 * 0.3 * 2542 | ||
|17794 - 21352 | |17794 - 21352 | ||
|28 * 0.25 * 0.735, 28 * 0.3 * 0.735 | |||
|5.145 - 6.174 | |||
|- | |- | ||
|50 | |50 | ||
| Line 31: | Line 35: | ||
|50 * 0.25 * 2542, 50 * 0.3 * 2542 | |50 * 0.25 * 2542, 50 * 0.3 * 2542 | ||
|31775 - 38130 | |31775 - 38130 | ||
|50 * 0.25 * 0.735, 50 * 0.3 * 0.735 | |||
|9.1875 - 11.025 | |||
|} | |} | ||
3. Select a cooler based on the BTU/hr derived in step 1 above. For the case of the 50 hp Power Cube, search for coolers that dissipate between 31775 and 38130 BTU/hr. Vendors list cooler specs by either hp or by BTU/hr. | 3. Select a cooler based on the BTU/hr derived in step 1 above. For the case of the 50 hp Power Cube, search for coolers that dissipate between 31775 and 38130 BTU/hr. Vendors list cooler specs by either hp or by BTU/hr. | ||
Thermal Transfer Mobile MA series coolers: | |||
http://www.industrialheattransfer.com/Air-Cooled/MA%20Series.pdf | |||
The "MA-18" core has the proper heat transfer specs, the "MA-18-4" has a 12v electric fan. | |||
AKG Mobile oil coolers: | |||
http://www. | http://www.akgts.com/fileadmin/_akgts/pdf/Cool_LineD_en.pdf | ||
Bailey lists products using both hp and BTU/hr, has bare coolers or coolers with fans and also lists the GPM rating of the coolers: | Bailey lists products using both hp and BTU/hr, has bare coolers or coolers with fans and also lists the GPM rating of the coolers: | ||
https://baileynet.com/hydraulics/bailey_hydraulics_other_products/?productcategory=1000053 | https://baileynet.com/hydraulics/bailey_hydraulics_other_products/?productcategory=1000053 | ||
Note that some of their fan motors are hydraulic, others electric. | |||
These are bare coolers and coolers with 12V fans meeting our requirements (28.5 GPM, 12.5 - 15 hp or 31k - 38k BTU/hr): | |||
AKG: 258-311, 258-318 | |||
Thermal Transfer: 258-329, 258-339 | |||
Hayden Auto lists coolers by BTU/hr in the section "Heavy Duty Oil Coolers": | |||
http://www.haydenauto.com/upload/HaydenAuto/Documents/Cat_Hayden/2007-hayden-trans-oil-coolers.pdf | |||
Note: The "COOLING BTU / HR" ratings is with 2500 cubic-ft/min airflow and 100°F differential in oil and air temperatures. So, this requires a fan to move the air to meet these requirements. | |||
Revision as of 19:46, 28 April 2013
This page describes how to size a hydraulic oil cooler for a hydraulic system. Hydraulic coolers are often specified by their ability to dissipate heat - usually measured in BTU/hr.
1. The power in the hydraulic system:
Horsepower = Pressure * Flow / 1714
2. The heat dissipated in a hydraulic system can be determined by summing the inefficiencies of all components in the system, but is usually between 25% adn 30%. The heat dissipated is measured in BTU/hr:
Heat dissipated = Horsepower * 0.3 * 2542
Here are some calculations for OSE engines:
| Engine hp | HP Formula | Horsepower | BTU Formula | BTU/hr | KW Formula | KW |
|---|---|---|---|---|---|---|
| 28 | 28 * 0.25, 28 * 0.3 | 7 - 8.4 | 28 * 0.25 * 2542, 28 * 0.3 * 2542 | 17794 - 21352 | 28 * 0.25 * 0.735, 28 * 0.3 * 0.735 | 5.145 - 6.174 |
| 50 | 50 * 0.25, 50 * 0.3 | 12.5 - 15 | 50 * 0.25 * 2542, 50 * 0.3 * 2542 | 31775 - 38130 | 50 * 0.25 * 0.735, 50 * 0.3 * 0.735 | 9.1875 - 11.025 |
3. Select a cooler based on the BTU/hr derived in step 1 above. For the case of the 50 hp Power Cube, search for coolers that dissipate between 31775 and 38130 BTU/hr. Vendors list cooler specs by either hp or by BTU/hr.
Thermal Transfer Mobile MA series coolers:
http://www.industrialheattransfer.com/Air-Cooled/MA%20Series.pdf
The "MA-18" core has the proper heat transfer specs, the "MA-18-4" has a 12v electric fan.
AKG Mobile oil coolers:
http://www.akgts.com/fileadmin/_akgts/pdf/Cool_LineD_en.pdf
Bailey lists products using both hp and BTU/hr, has bare coolers or coolers with fans and also lists the GPM rating of the coolers:
https://baileynet.com/hydraulics/bailey_hydraulics_other_products/?productcategory=1000053
Note that some of their fan motors are hydraulic, others electric. These are bare coolers and coolers with 12V fans meeting our requirements (28.5 GPM, 12.5 - 15 hp or 31k - 38k BTU/hr):
AKG: 258-311, 258-318 Thermal Transfer: 258-329, 258-339
Hayden Auto lists coolers by BTU/hr in the section "Heavy Duty Oil Coolers":
http://www.haydenauto.com/upload/HaydenAuto/Documents/Cat_Hayden/2007-hayden-trans-oil-coolers.pdf
Note: The "COOLING BTU / HR" ratings is with 2500 cubic-ft/min airflow and 100°F differential in oil and air temperatures. So, this requires a fan to move the air to meet these requirements.