Inverted Blower Fan

Are you sure it was supposed to be a blower fan? Natural convection would be upward, and if the fan is on top it would seem natural for it to be exhausting.

Yes, it is supposed to be a blower fan. Considering the temperature here in the Philippines, the transformer manufacturer designs only blower type fan directed at the silicone core of the transformer to prevent it from heating up profusely. What I want to know is the difference before and after the invertion of the fan? Can you give me your comments on this?

Who is the manufacturer? Did you contact them? Since hot air naturally rises, I agree with the first comment. It would not make sense to install a fan to blow air into the unit. You generally would want to work with nature, not against it.

Most of these applications I have been involved in have had the fan(s) installed on the bottom of the unit, directing the air into the coils.

Maybe the transformer has been installed upside down ? Then the blower fan at the bottom of it would make sense.

Quote "the transformer manufacturer designs only blower type fan directed at the silicone core of the transformer to prevent it from heating up profusely. "

Reygay

I would check with the MFG but according to you post, the fan is supposed to BLOW air at the silicone core. You will not get the same air flow across this area using a circulation fan. Suggest you check and see who made the change and why.

Heat rises and when the cooling fan is placed on top of the transformer enclosure, it is supposed to accelerate the removal of heat generated by the transformer, away and out of the cabinet. Due to the normal ambient temperature existing in your area, surrounding outside air were already pre-warmed or preheated, and Blowing in pre-warmed air into the cabinet will not only block the rising heat generated by the transformer, it will also further accelerate the temperature rise of your unit. As long as the lower portion or bottom end of your transformer enclosure are not blocked where fresh and much cooler air exist, then using it as an exhaust fan makes more sense..

I agree, but I forgot to inform you that the enclosure has 8" x 14" ventilation windows on all four (4) sides plus the bottom end of the transformer is open and that's where the cables go thru from the transformer. Please help me by giving your opinion on these matter.

Have you asked the manufacturer about this? If not, why not?

I have'nt asked the manufacturer about this. I just want to gather scientific opinions on this so that I would know what to ask the manufacturer and what to do about this, since this is already tampering on the part of my client.

I would suggest you talk to the manufacturer, ask him how he designed the fan to be installed. If indeed the fan is supposed to be blowing into the transformer enclosure from the top, then tell your customer to correct the installation.

As I mentioned before, I am used to seeing fans direct the air upwards through the coils, but if you manufacturer tells you that that is his design intent and he will vouch for it, so be it.

No matter what we say here, I would not direct a manufacturer to change his design unless I specifically requested a particular feature in my specifications, or you will be taking the liability for it.

That's the problem. This Japanese client has lots of transformers being used in their various machineries but all of them has exhaust fans on their transformers. That's the reason they inverted the fan installed on the transformer I delivered. Its either they just want uniformity on their transformers or they really believe that exhaust fans are really better than a blower. I also noticed that other transformer manufacturers here uses exhaust fan instead of the blower. Now that I have given you the complete picture of the said transformer, I hope you could give me your wise opinion or comparison of both fans.

As Tornado said it is an exhaust fan not a blower fan because its location is on the top of the transformer.

I know the Japanese are very accurate,impossible to do an error like this as you think.