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HRV vs ERV

RoosterBoy
RoosterBoy Member Posts: 459
in THE MAIN WALL
would be a good place to visit on the internet.

it is also a bit like this HRV's save some of the heat that would have bailed from your home...so in Anartica and the arctic they are "efficent" ,in much warmer climates the ERV's ,are more likely the efficent choise.

it isnt quite that simple, however ... as the recovery of Heat laden in the indoor air is transmitted to the out doors in really cold climates it tends to pay to have an HRV.

erv's can Work too it just might be better suited though to more moderate climates where the energy to recover the out going BTU's is porportionaly lower cost and fewer BTU's are actually making thier break out the exhaust ...

the next place to look might be under something called the BEES program. it gives some general outlines to seperate methods to determine the ventilation requirements and a couple "options" and the standards of construction required to avail oneself of the options :) it isnt a Large hand book and may even be available in PDF.

Comments

  • Simply Rad_2
    Simply Rad_2 Member Posts: 171
    HRV vs ERV

    On most maps I have seen. I live on the edge(northwestern colorado) of the HRV/ERV line. What I have read is that HRV are for heating dominant climates with dry air and ERV are for cooling dominant with humid are. Can anyone enlighten me alittle more on the subject.
    Thanks Jeffrey
  • jerry scharf_3
    jerry scharf_3 Member Posts: 419
    my $.02

    Jeffery,

    As you probably know, the difference between an HRV and an ERV is that HRVs only recover sensible (air temp) heat and ERVs also get latent (moisture) heat. It has been a general rule that HRVs have higher sensible heat recovery. So when the overall moisture levels are low (cold air), you want maximum sensible heat recovery and when you have higher moisture levels (warm air) you want latent heat recovery even if it sacrifices some sensible heat recovery.

    Now, the best ERV has a higher sensible heat recovery rate than any HRV. With the assumption behind the map gone, so goes the accuracy of it. Of course, this is only for one product, so the map is still right for other products.

    jerry
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