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walt
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Join Date: Nov 2012
Location: Central New York
Posts: 84
Good Answers: 4

Heat Exchanger

09/15/2014 2:35 PM

I have a remote solid fuel heat source for my house(outdoor furnace) that I want to add another heat loop. This will be isolated from the existing system by a brazed plate heat exchanger. The secondary side will be freeze protected and I do not want to antifreeze the whole system. My current system has a pump feeding 60 feet of pex tube (3/4) into a brazed plate exchanger then 60 feet of pex return. I am trying to determine if the pump, which will pump another 60 or so feet has enough push to go through another brazed exchanger. I think it will. I have been unable to find numbers on the resistance through the exchanger. Manufacturers info. does not mention that aspect. I'm going to use a 3x5 inch 15 plate exchanger with 3/4" fittings. Thanks for any help.
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Crabtree
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Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
Posts: 2599
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#1

Re: Heat Exchanger

09/15/2014 5:25 PM

Yu need to talk to the pump manufacturer and the heat exchanger manufacturer.

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tcmtech
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Join Date: Jun 2009
Location: South of Minot North Dakota
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#2

Re: Heat Exchanger

09/15/2014 5:31 PM

For long runs it's a common practice to use two or more pumps in series along the entire circulation loop.

Thats how I would set it up with the added 60 more feet.

BTW I also use a boiler system to heat my house. The problem is that the boiler is in a room on the side of my shop and my house is 300+ feet away. To overcome the flow rate problem of having that long of loop of 1" pex I use one pump to push the water to the house and an identical one to push it back.

It works very well!
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#3

Re: Heat Exchanger

09/16/2014 6:02 AM

How many gpm. Btu/h, psid, hp, rpm, impeller diameter--how many anything?

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PFR
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Join Date: Nov 2010
Location: Virginia, Georgia, Idaho
Posts: 1079
Good Answers: 30
#4

Re: Heat Exchanger

09/16/2014 10:39 AM

If you are going to install the small heat x before the primary heat x, and return it to the loop after the primary heat x, you may have some supply/balance issues. The limited info that you are giving leads me to believe that the single pump is probably enough, but that it needs to be plumbed properly to work well, and those decisions are not always intuitive. Call the outdoor furnace manufacturer, (or one like it if it is no longer available), and ask for an experienced opinion with your layout template. This will require a whole lot more info than you gave us, but will not be that tough to gather. Make a line drawing.

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walt
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Join Date: Nov 2012
Location: Central New York
Posts: 84
Good Answers: 4
#5

Re: Heat Exchanger

09/16/2014 11:49 AM

Thank you for the input. My first thought was to do it cheap. Then I realized that for the added cost( couple hundred bucks) I could do it right and not have to do it over. There is another set of taps into the shell so it will be a very short loop with a pump and X back to furnace. with proper piping and valves. Thanks again.
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Crabtree
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Join Date: Jul 2007
Location: Commissariat de Police, Nouvions, occupied France, 1942.
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#6

Re: Heat Exchanger

09/17/2014 2:54 AM

Yu need to talk to the pump manufacturer and the heat exchanger manufacturer.

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