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[timbur]

Scott , I had a customer who put a 12 x 12 heat exchanger on his dryer . He claimed that he was only getting 100deg air temps coming out of the coil and in comparison to the original electric dryer it took him twice as long to dry a load of wash , but he didn't mind , because this was free !

Anyhow , I have an extra dryer that I thought about converting , ( I have no idea when I'll find time ) . I'll be looking forward to hear how this works out for you .

   Good Luck !

[Scott7m]

I think I can get it hotter than that

RSI has been using one for 7 years, he said jeans take longer but no biggie

[RSI]

Yeah, I get hotter air than that and I only have 1/2" pex lines going to it.
The air coming out at first is a lot colder because the clothes soak up most of the heat at first.

It doesn't get as hot as the electric dryer but that is much better for the clothes anyway. If the extra time (if needed) does cause a backup, the other dryer just gets used.

[Scott7m]

Yeah, I get hotter air than that and I only have 1/2" pex lines going to it.
The air coming out at first is a lot colder because the clothes soak up most of the heat at first.

It doesn't get as hot as the electric dryer but that is much better for the clothes anyway. If the extra time (if needed) does cause a backup, the other dryer just gets used.

What kind of temps do you think I could get with an 8x8 ?  Does those 8x8's have 1" lines?  Just estimate?

[RSI]

I have never actually checked the temperature on it but I am sure the 8x8 can make it hotter than my thin 12x12. I will stick a probe in the exhaust tube on it to see what it is running at.

[Scott7m]

I have never actually checked the temperature on it but I am sure the 8x8 can make it hotter than my thin 12x12. I will stick a probe in the exhaust tube on it to see what it is running at.

10-4, I'm planning on sending it 180 degree water.  My flow is good

[RSI]

Even with the 1/2" lines the return is still hot. A dryer running over 200 degrees only uses 17K btu so it will be as good as you can get with that heat exchanger.

Adding a fan might help a little but not real sure. If the drum seal is leaking then it would but otherwise probably won't help any.

[Scott7m]

Yep, we'll see how it does

[ben burnin awhile]

 i have 12x12  externally with hose  on old gas dryer   and usually get  about  105  temp out of vent  it struggles with towels  always run them twice replace drum seals  when hooked up though it is on top of 220 dryer with 3 qtr plwood between them kinda like a double decker dryer exchanger sits on shelf on wall behind it been using 2 years happy with it

[RSI]

I checked the temperature and it is not quite what I was expecting. I think the drum seal might be going bad or it has another air leak. I need to run it empty and see if it gets close to the same inlet and outlet temps. If not, it means air is getting in somewhere other than the heat exchanger. The air going in seems to be about 20 degrees less than the water temp. Green line is the vent and the purple line is the air entering the dryer.

[Scott7m]

RSI, I can't see those numbers on my phone, what was the actual temps

[RSI]

go to www.my-thermometer.com

[Scott7m]

129, that's not bad. 

What were you expecting?

[RSI]

That was with it restarted the second time.
I guess the clothes do absorb a lot of heat when wet.
It did used to dry a little quicker so I think it is leaking air past the hx somewhere. Also, I think the 1/2" pex is what is keeping the inlet 20 degrees lower. Going with larger should get it hotter.

[Boydz]

RSI,

What are you using to track and trend this data ? Its pretty sweet.