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Author Topic: heat exchangers in series  (Read 3899 times)

woodburner85

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heat exchangers in series
« on: April 03, 2015, 08:12:02 AM »
Has anyone hooked 2 plate exchangers in series to gain temperature in the water circulating through the baseboards of a house.  I have trouble keeping my house warm because the baseboard heat was designed for 180 degree water and am looking for options to increase water temp.  Thanks
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RSI

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Re: heat exchangers in series
« Reply #1 on: April 03, 2015, 09:09:20 AM »
You probably won't gain much from the 2nd heat exchanger. The temperature differential will just be too low to do much.
What size is your existing heat exchanger?
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woodburner85

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Re: heat exchangers in series
« Reply #2 on: April 03, 2015, 10:57:58 AM »
It is a 40 plate
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mlappin

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Re: heat exchangers in series
« Reply #3 on: April 03, 2015, 11:36:03 AM »
Quote from: woodburner85 on April 03, 2015, 10:57:58 AM
It is a 40 plate

Instead of using two buy a single higher plate count like a 60 or 70.
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wissel12

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Re: heat exchangers in series
« Reply #4 on: April 03, 2015, 11:43:17 AM »
What temp are you running your boiler at?
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RSI

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Re: heat exchangers in series
« Reply #5 on: April 03, 2015, 12:00:27 PM »
If you only have a 40 plate now then going with one large one should help.

Have you checked the OWB water temp out of the plate when it is under load? If it is dropping to near the temperature of the outlet of the plate to the indoor system, you don't have enough water flow on the OWB side and going with a larger heat exchanger won't do much.
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woodburner85

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Re: heat exchangers in series
« Reply #6 on: April 04, 2015, 05:50:52 AM »
Pump I had was a 009, I just put in an 011 yesterday.  Pry won't be a good test till it gets real cold again next year.
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jamesbodeis

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Re: heat exchangers in series
« Reply #7 on: April 04, 2015, 09:55:08 AM »
I'm going with a bigger exchanger for next year also. Had a 40 plate and on the coldest nights it couldnt keep up. Reading the descriptions on altheatsupply or whatever it is, looks like i need a 60 or 70. Im gonna repurpose the 40 and put it on the hot water heater.
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fireboss

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Re: heat exchangers in series
« Reply #8 on: April 04, 2015, 02:27:53 PM »
Same here going from a 40 to at least an 80 those real cold nights it didn't keep up!
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woodburner85

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Re: heat exchangers in series
« Reply #9 on: April 04, 2015, 07:21:20 PM »
Well if anyone is looking for a used 40 plate, I will pry have a 2 year old one for sale.  Let me know
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RSI

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Re: heat exchangers in series
« Reply #10 on: April 05, 2015, 10:04:19 PM »
Do you heat your DHW with the OWB?
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woodburner85

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Re: heat exchangers in series
« Reply #11 on: April 06, 2015, 10:19:10 AM »
Yep with a 20 plate and I am able to kill power to the water heater
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RSI

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Re: heat exchangers in series
« Reply #12 on: April 06, 2015, 10:33:22 AM »
I would replace the 20 plate with your 40 plate and sell the 20 instead. The 40 plate will have less head pressure loss so you will get better flow on the OWB. This will help get the most out of the new larger plate.
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12valve

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Re: heat exchangers in series
« Reply #13 on: April 07, 2015, 11:47:57 AM »
woodburner, turn you aqua stat up.  I run my boiler at 191 on 180 off.  You would not believe the difference in the amount of heat this produces in baseboards compared to 160 to 170.  It is honestly night and day difference. 
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12valve

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Re: heat exchangers in series
« Reply #14 on: April 07, 2015, 11:54:36 AM »
I run a 60 plate by the way.
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