Heat Recovery Ventilators
- Thread starter Trail Talk
- Start date
TAOspinner
New member
Adding an outside vent to the heater is the cheapest option but it actually is no better that opening a window as far as efficiency goes because now the heater is having to heat that cold air instead of the cabin air requiring much more energy to do so.
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TAOspinner
New member
After testing the one i build, I’d definitively consider building more. I’ll need to create special vent covers for the fresh and exhaust. Anyone desire to help with this? 🙂Sounds ideal! any interest in building more? Then sell your business to Dometic?
A 3D printed model would be great to start with…
DM me a napkin sketch. If it is fairly straight forward, I can cook you up a model for printing.
TAOspinner
New member
Awesome! As soon as i determine the tube dimensions, I’ll get back with you.
TAOspinner
New member
Yes, because the unit is not insulated from the outside air, humid cabin air will more easily condense and freeze near the outer portion of the inlet. Also, the fan is on the inside of the core which creates a lower pressure on the inlet side further reducing the air’s temperature.So I did a bit more digging into the Lunas eGO as well as the E2 units.
And again, HRV units have their place, but you have to decide whether or not it is justified for your use case.
For those interested in these... there are a couple of items Id suggest you look into further
There doesnt look to be sufficient data for both the E2 and the eGO, so data looks to overlap... YMMV
But extreme cold operation and noise are two concerns of mine, besides what Ive already expressed in the thread so far.
For extreme cold... this seems like a legit issue. 35% ? Thats awfully low.
Which seems contrary to this claim with regards to frosting, claiming testing and operation down to -32 without "active prost protection"
Introduction to Lunos e² Heat Recovery Ventilation
The Lunos e² decentralized high efficiency heat exchange whole house ventilation system remains a breakthrough in building technology - combining high performance with simplicity of installation and operation. Introduced in 2012 to the US market by 475, the system has proved its effectiveness...475.supply
And finally, specific to the eGO, the noise issue. Looks like up to 38dB, which would definitely bother me....
especially when you factor in the oscillation. The fans cycle back and forth.... constantly
Another problem with these single source units is that during the outflow a low pressure condition is created within the cabin. There is no way around it that air will infiltrate through small cracks in the air barrier of the cabin thereby negating the purpose.
Alloy
Well-known member
Adding and an outside vent to the heater is better because the wasted heat if the exhaust can be used the heat the incoming air.
This is a concentric vent I made.
TAOspinner
New member
That is awesome!
Alloy
Well-known member
Anyone thinking of these should read posts #54 and #59