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HRV systems in infloor heating applications

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Paul Pollets
Paul Pollets Member Posts: 3,656
in THE MAIN WALL
as well as a return from the HRV for best results. The exhaust fan moves 3x as much air as the HRV inlet or outlet. I tend to use a min of 110CFM for a master bath and put in a 30CFM return from the HRV. This means after the fan is turned off, humidity is being constantly removed.

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  • Tom Meyer
    Tom Meyer Member Posts: 300
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    Air flow from HRV

    How much does the air flow from an HRV create issues for occupants of a in-floor heated home?

    I'm working on a project and the customer has heard the air flow causes noticeable discomfort to the occupants.

    Anyone have experience combining those systems? Any experience or pitfalls?

    Tom Meyer
    Senior Designer/Trainer
    Precision Hydronics
    www.precisionhydronics.com
  • Dan Peel
    Dan Peel Member Posts: 431
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    proper use is good

    When used for humidity and air freshening only the HRV is a wonderful appliance. Over-use can cause some dramatic increases in heat loss. A 200 cfm unit operating at 75% recovery still exhausts 50cfm raw when running. One customer who headed off to Florida last winter and left their HRV set to "Arizona dry" at 55F setpoint managed to consume over $500 per month in propane. Once reset the fuel consumption dropped by 80%. Little things.......Dan

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  • JimmyJam
    JimmyJam Member Posts: 78
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    HRV/Radiant project

    We would normally diffuse the "fresh air" in multiple locations on high walls with diffuser directing air upwards towards ceiling so air will temper before dropping towards occupants and have never had any complaints.Air flow (average for us) is only 100-150 CFm so it is not alot of air to be concerned about,just don't locate fresh air in hallway directed towards radiant thermostat. If homeowner so chose they could have you install an inline duct heater to temper discharge air after it exits the HRV. Thermolec makes a real neat inline heater that would work,however we have only installed these on commercial projects.
    Hope this helps!
  • Michael B
    Michael B Member Posts: 179
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    I second

    that. Small amounts of exchange (150 CFM's) discharged in multiple locations is the way to go. We sell Fantech HRV's and have tremendous feedback from our customers. The Fantech line has developed an HRV that can be piped in line with their HEPA filtration system that is the cats pj's. Radiant+HRV+HEPA=Happy customer.

    Michael Bleier
    Able Distributors
    "The Supplier That Works With You"
    www.abledistributors.com
  • Paul Pollets
    Paul Pollets Member Posts: 3,656
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    HRV's

    enhance any indoor air application and are a perfect complement to radiant floor heating. It's rather difficult to screw up an HRV installation... if one can read the instructions and follows the ducting recommendations. ART has installed over 100 of the LifeBreath HRV's and TFP's. Every client raves about their performance.

    See www.lifebreath.com

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  • Ken
    Ken Member Posts: 26
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    HRV as bathroom fans?

    What is the opinion on using the HRV system to exhaust the bathrooms? Do they move enough air?

    What is the normal procedure for doing this if you have more than one bathroom. Do you normally just vent them all every time you want to vent one?

    I understand you balance the HRV to ensure you don't over or under pressurize the house but do you also adjust the dampers to match the flow to the sq. footage of the house?

    Ken Caverly










  • Steve Eayrs
    Steve Eayrs Member Posts: 424
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    HRV's are great........


    and used a lot, up in Alaska where I am at. We seldom install a new radiant floor system, without also installing an HRV. Use mostly Vanee/Venmar. Never have had a problem with cold air and done over 200 systems.
    Its important to run all ducts high on the alls or on the ceiling, and you will never have a problem.
    Most new houses here are R50-60 ceilings, R25 walls or better, and 2" foam insulation under any slabs. Special care is always given to vapor barriors sealed up real well, to the HRV is needed to get rid of excess humidity in most places.
    Never noticed a big difference in fuel costs w/ one. A lot better than opening a window in the winter.
    Yes, All bathrooms are venting whenever one switch is activated. In a normal house, all bathrooms, kitchens, laundry rooms, or other room that produce moisture, are the exhaust to outside, and all the rest of the rooms in the house are ducted with fresh air, through the hrv.
    Wouldn't recommend doing a tightly sealed house without one.
    Steve
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