[Shop-talk] Looking to buy a compressor

[old dirtbeard]

Hi Darrell,

IMHO, I would recommend against your planned course of action.

   1. All coolers on air compressors are placed between the pump and the
   tank where the air is the hottest and the heat transfer will be the
   greatest.. In your design, most of the heat will be absorbed by the tank
   before it gets to the radiator. It will not be an efficient heat transfer
   located after the tank.
   2. I also believe that putting it on the tank outlet will restrict your
   flow as that is where you need the maximum flow. You can take advantage of
   the "surge capacity" of the tank which is only limited by the size of the
   piping from the outlet of the tank to the air device you are using. Placing
   a cooler between the tank and the air device could limit the flow of the
   tank to the device.
   3. If you put it between the pump and the tank, the cooler only needs to
   flow at the capacity of the pump (e.g., 10CFM). You potentially could get
   100X that flow out of the stored capacity of the tank if the piping is
   large enough. You do not want any restriction between the tank and your air
   devices
   4. Whatever you choose to do for a heat exchanger, I sincerely believe
   that it will not be effective, and it probably will diminish the overall
   performance of your system, if you do not put it between the pump and the
   tank.

IMHO

doug

On Wed, Aug 12, 2020 at 8:53 AM Darrell Walker <darrellw360 at mac.com> wrote:

>
> The transmission cooler I’m looking to use is a "stacked plate” design,
> and has a pressure rating of 200 PSI.  It says it has a 29,200 BTU rating:
>
> https://www.summitracing.com/parts/BMM-70274
>
> I do plan to put a small box fan to blow through it as well.
>
> Here are some pictures, but these all seem to be between the compressor
> and tank, mine will be mounted on the wall after the tank.
>
>
> https://www.cnccookbook.com/aftercooling-a-compressor-to-cut-down-on-moisture/
>
>
> -Darrell
>
>
> On Aug 12, 2020, at 8:35 AM, Jeff Scarbrough <fishplate at gmail.com> wrote:
>
> Good point.  I hadn't thought of air flow rate.  Hook several in parallel?
>
> On Wed, Aug 12, 2020 at 11:26 AM DAVID MASSEY <dave1massey at cs.com> wrote:
>
>> That's a clever idea.  It is an excellent heat exchanger and is good for
>> the pressure.  But it could restrict air flow.  Most are just a long,
>> serpentine tube with fins.  It all depends on what air tools you are
>> using.  It is possible that you couldn't run a sand blast cabinet through
>> it.  But you could hook up the high volume users to bypass the cooler and
>> save the dry air for the tools that need it.
>>
>> Dave
>>
>>
>>
>> -----Original Message-----
>> From: Jeff Scarbrough <fishplate at gmail.com>
>> To: shop-talk at autox.team.net <Shop-talk at autox.team.net>
>> Sent: Wed, Aug 12, 2020 10:12 am
>> Subject: Re: [Shop-talk] Looking to buy a compressor
>>
>>
>>
>> On Wed, Aug 12, 2020 at 11:08 AM Pat Horne <patintexas at icloud.com> wrote:
>>
>>
>> I’d be concerned with using a transmission cooler for an aIr cooler
>> because they are not designed for pressure use. I wouldn’t think a trans
>> cooler would need to be rated at more than 10psi.
>>
>>
>> An air conditioner condenser would probably be better.  It even has
>> "condenser" in the name....
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