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Bluefirfly

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Reply with quote  #1 
First phase is there https://simplysolar.supporttopics.com/post/my-first-project-downspout-hrv-preheater-6657362?&trail=10

I completed the system last year so this is my second winter using it and I like it a lot.

Here's the completed setup from the outside: 36-outside view.jpg 

it's connected to my Heat Recovery Ventilator (HRV) so the fresh air from the outside is warmed up by the HRV then directed to the panel (when panel is hot enough) then back to the house. The air goes in at the bottom travels to the top, take a smooth 180 degree turn and goes back down and in the house.

  IMG_0418.jpg 

32-connection details.jpg 
A snap disk inside the panel controls the motorized dampers that direct the air to the panels or not.

38-TY Damper2.jpg 
37-Sol Panel Loop.jpg 

I also added a snap disk on the ducts inside the house to shift the HRV to max speed automatically when the panel is at max temperature:

39-High Speed switch.jpg 

I used a couple of cheap thermometers at first:
Temp.JPG 
but I now have a good datalogger with 4 temperature probes. I don't have a picture for that but maybe I'll take one and post it later. The temperature gain is usually about 30+C on clear days.

Love it!


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Bluefirfly
Fredericton, NB Canada

Bert

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Reply with quote  #2 
Looks great. I like that sun on top. Yellow and thinking green.
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Bert K.
Michigan

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stmbtwle

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Reply with quote  #3 
Nice install! I'm impressed!


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Willie, Tampa Bay
gbwillson

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Reply with quote  #4 
Great looking build and use for a tall, and underused, so far, vertical space! I hope to more people go vertical.
What the volume of air you are moving to get the 30c amp rise?

Greg in MN
Bluefirfly

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Reply with quote  #5 
"What the volume of air you are moving to get the 30c amp rise?"

My HRV is rated at 184 cfm but with resistance from elbows and extra distance through the panel I would estimate no more than 120 cfm.


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Bluefirfly
Fredericton, NB Canada
gbwillson

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Reply with quote  #6 
So of the roughly 120CFM, is all of that fresh intake air, or is there a mix of warm recycled air too?

Greg in MN
mranum

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Reply with quote  #7 
Very nice, and blends in very well with the building. 
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Bluefirfly

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Reply with quote  #8 
Quote:
Originally Posted by gbwillson
So of the roughly 120CFM, is all of that fresh intake air, or is there a mix of warm recycled air too?

Greg in MN


It's all fresh air that has been warmed in the HRV by the heat of the exhaust air.




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Bluefirfly
Fredericton, NB Canada
gbwillson

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Reply with quote  #9 
Gotcha,

That makes a lot of sense, instead of such frigid air entering the HRV. What happens come spring when the extra heat and HRV are not needed? Does the system automatically switch to exhaust excess heat, instead if bringing it into the house?

I had a recent home energy audit and was advised to install an HRV unit as soon as possible as my house is too tight. I've been looking at making my own HRV since my house is small and installed HRV units can be rather pricey. If I do, I'll surly incorporate a solar pre-heater.

Greg in MN
Bluefirfly

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Posts: 14
Reply with quote  #10 
Quote:
Originally Posted by gbwillson
Gotcha,

That makes a lot of sense, instead of such frigid air entering the HRV. What happens come spring when the extra heat and HRV are not needed? Does the system automatically switch to exhaust excess heat, instead if bringing it into the house?

I had a recent home energy audit and was advised to install an HRV unit as soon as possible as my house is too tight. I've been looking at making my own HRV since my house is small and installed HRV units can be rather pricey. If I do, I'll surly incorporate a solar pre-heater.

Greg in MN


I have wired a regular wall thermostat to the 24 volt transformer that power the motorized dampers. It works like a normal thermostat, if its too hot in the house it shuts down the power to the dampers and returns the air flow to standard HRV, not solar heating.

The HRV is used year-round, in the summer it does warm the house somewhat but it work on temperature differences. If the air in the house is cooler than outside, the HRV will slightly cool down the incoming air by using the lower temp in the exhaust air.

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Bluefirfly
Fredericton, NB Canada
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