Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

ERV Systems Developing Mold

Options
Crissie
Crissie Member Posts: 132
Has anyone had experience with an ERV system developing mold because of the difference in temp's and humidity moving through it?

Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Options
    How many threads are you going to start about one heating system?

    There was an error rendering this rich post.

  • Crissie
    Crissie Member Posts: 132
    Options
    I don't have but need to get an ERV. It is not related to the boiler sizing questions.
  • Jamie Hall
    Jamie Hall Member Posts: 23,675
    Options
    There are two types of energy recovery ventilators. Sensible heat recovery systems and latent heat recovery systems. Furthermore, some are ducted to be counter current and some parallel flow.

    OK. That out of the way. Latent heat recovery systems all recover not just the sensible heat in the air, but the latent heat -- the excess moisture in the indoor air leaving is condensed in the heat exchanger, and then evaporated in the intake air stream. While these do recover much more of the energy in the indoor air, and are thus rated t have a much higher efficiency, they also recycle into the incoming air most of the contaminants and bacteria and virus which is in the exhaust air -- and as such they don't improve indoor air quality significantly. They can and do grow mold on the heat exchange medium.

    My recommendation is to avoid them like the plague.

    The sensible heat recovery units are simple heat exchangers. At some point in the heat exchanger -- where depends on whether they are counter flow or parallel flow and the indoor dew point and the outdoor air temperature -- they may condense, but only on the exhaust side of the heat exchanger. It is possible to get mold growth on the exhaust side, but not on the intake air side, and thus it won't affect the incoming air quality.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Crissie
  • Crissie
    Crissie Member Posts: 132
    Options
    @Jamie Hall I'm trying to move to hydronic heat, easier said than done. Still need AC and ventilation. Thanks for the above, do you have any preferred brands?