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...
Forum Discussion
daytona7 wrote:
Professor. (hand waving) May I have another try? How would heating duct booster fans work bringing cooler outside air into the AVR and manual start with another drawing hot air out from the back?
That is the better approach. As shown in the photos below (posted several years ago) there are two air flow patterns - as you noted one is INTO the back of the alternator, across the AVR and out the bottom where it bolts to the engine. The other is the typical inlet to the fan on the recoil starter, around the cylinder and over the top of the alternator and muffler.
The muffler is still a problem as approximately half of the total BTU's generated by combustion are radiated in that metal chamber. If any way possible get it outside and away from your compartment.
One of the major problems I encountered when I began experimenting with compartment cooling is pushing too much air into the compartment. This created a positive pressure which disrupted design air flow. The most successful approach temperature wise was to use only an exhaust fan under the junction of the engine and alternator with fresh air openings that excluded internal heated air at the starter and alternator end. In a compartment you want the negative static pressure (air flow strength) to be able to snap a newspaper tightly over either fresh air inlet. If you can't get the newspaper to hold to the opening you will not have enough directed air flow to cool the beast.
I have included some shots of the exhaust fan I use (electric radiator fan) in a box that the engine sits on top of. Cool air is brought into the "cave" through a refrigerator grill mounted in the hatch. There is a smaller 6" muffin fan mounted on the AVR end. Note the muffler is outside. The red "flag" blowing straight out with the fan on the test bench will give you some idea of the air flow. If the fan will remove the heat from the radiator of a 2.5L water cooled engine it will remove the heat of a 200cc air cooled engine :B
This has worked well for me over the past several years. BTW - there is no gasoline in the tank. Fuel is propane.
