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Forums › Home Workshop DIY › Home Ventilation - Separating the Salient from the Sales - Your thoughts?
Slumlord

2 posts

Wannabe Geek


#119316 28-May-2013 10:02
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Anyone got some sound insight on home ventilation? Lots of companies out there, lots of sales talk. I am comparing Sayr and Smartvent. HRV seems to expensive and pushy. Wondered if anyone could help with separating the companies, if speaking from experience. Does a fancy controller really matter? Is it all about the number of thermostats? As far as I can see they all do the same thing. Thoughts, people? PS: Don't just tell me to open a window - thanks.

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Skolink
1081 posts

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+1 received by user: 32


  #827646 29-May-2013 11:43
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timmmay:
I still don't understand why you can do better than equilibrium between incoming and outgoing air, given equal volumes. Sure if you had 1000L of air at 20 degrees and 1L at 0 degrees it's easy to get the 0 degree air up to 20 degrees, but with equal volumes that's not the case.


The air isn't mixing, so it isn't the same as tipping 1L of say 80°C water in with 1L@20°C where you will get 2L @50°C.

The air is trying to achieve equilibrium, but at each point along the heat exchanger. I drew you a picture:



Also don't forget that if moisture is condensing from the stale air (on its way out), then you get energy recovered from the latent heat of evaporation (but of course the fresh air temperature can never exceed the temperature of the stale air, it just improves the efficiency).

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