3000W Chinese Gensets Info.
professor95 wrote: EDIT ADDED 45/5/2013- When this thread started in March of 2005, I never expected to see it survive this long or amass the quantity of information that has been shared here. In...
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Some preliminary test data on my much-modified DuroPower 3500ES!
I put the Hardibacker "lid" where the gas tank used to be and cut an 8" hole over the end with the insulated muffler enclosure and the generator (figuring that's where the heat is most critical ... the engine has forced air cooling and it can take care of itself!) The ProComp 500 cfm fan is mounted to the underside of the Hardibacker and is sucking accumulated hot air and blowing it out. The bottom of the genset is completely open as originally designed. Originally there were a few vents in the enclosure panels on the sides and my Hardibacker lining has closed those off, so I'm trying a top power vent to account for losing the vents on the sides. The reason you see carpet on the outside of the top panel is that I intend to enclose the top of the genset frame with an opening out the left end - the carpet will help sound abatement inside the duct. I'll line the "lid" that will enclose the duct with carpet, too.
Here's some preliminary temps once the engine had stabilized after about 30-40 minutes: (This is under "ideal" conditions - no load, inside a garage in the shade, ambient air temp about 75 degrees.)
1) Passive heat rising through the fan opening (fan not running): 128 degrees.
2) Generator exhaust air: 148 degrees
3) Air temp approximately 2" above cylinder and avoiding exhaust cooling air from cylinder: 138 degrees
4) Oil temperature: 188 degrees
The 500 cfm fan in the "lid" was connected to a 140 degree switch approximately 2" above the engine cylinder fins and not in the path of the forced air engine cooling. The fan never came on throughout the run. About 5 minutes after shutdown, the sensor got heat soaked enough to run the fan for about 5 minutes - the fan then shut down, waited about 5 minutes, ran for a minute or two, and the repeated the cycle one more time after about 3 minutes and that was it.
Although these are very ideal conditions, it encourages me that the genset never got hot enough to activate the fan while it was running. It'll be interesting to see what happens outside with about 85-90 ambient and running the A/C on the fifth wheel!
Regards,
John
I put the Hardibacker "lid" where the gas tank used to be and cut an 8" hole over the end with the insulated muffler enclosure and the generator (figuring that's where the heat is most critical ... the engine has forced air cooling and it can take care of itself!) The ProComp 500 cfm fan is mounted to the underside of the Hardibacker and is sucking accumulated hot air and blowing it out. The bottom of the genset is completely open as originally designed. Originally there were a few vents in the enclosure panels on the sides and my Hardibacker lining has closed those off, so I'm trying a top power vent to account for losing the vents on the sides. The reason you see carpet on the outside of the top panel is that I intend to enclose the top of the genset frame with an opening out the left end - the carpet will help sound abatement inside the duct. I'll line the "lid" that will enclose the duct with carpet, too.
Here's some preliminary temps once the engine had stabilized after about 30-40 minutes: (This is under "ideal" conditions - no load, inside a garage in the shade, ambient air temp about 75 degrees.)
1) Passive heat rising through the fan opening (fan not running): 128 degrees.
2) Generator exhaust air: 148 degrees
3) Air temp approximately 2" above cylinder and avoiding exhaust cooling air from cylinder: 138 degrees
4) Oil temperature: 188 degrees
The 500 cfm fan in the "lid" was connected to a 140 degree switch approximately 2" above the engine cylinder fins and not in the path of the forced air engine cooling. The fan never came on throughout the run. About 5 minutes after shutdown, the sensor got heat soaked enough to run the fan for about 5 minutes - the fan then shut down, waited about 5 minutes, ran for a minute or two, and the repeated the cycle one more time after about 3 minutes and that was it.
Although these are very ideal conditions, it encourages me that the genset never got hot enough to activate the fan while it was running. It'll be interesting to see what happens outside with about 85-90 ambient and running the A/C on the fifth wheel!
Regards,
John
