Any updates?
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-AC_Hacker |
woohoo :)
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Don't know if anyones coroplast stacking is yet completed but might not cutting some 1" wide spacers to be used to separate cross layer giving you just one layer of separation over most of the area. Strips could be stapled(construction hand staple gun) in place until "core" can be placed in a custom mechanical compression form(from your pics of cross flow box line up corners with air flow dividers and and have "bottom" and "top" of box "press" core together when assembled. As not sure how well or how long(possible rusting) staples would last.
Always been interested in the theory HRV/ERV but living in a climate with several months of sub zero heating days effectively resolving "frost up" still isn't evident to me. Heat pump xfer seems intriguing but won't it need a fairly large amount of in/out going air? I am exploring maitaining indoor air quality in my SI passive addition by minimizing VOC's, lifestyle, low temp solar fresh air preheaters(daytime) and still researching where I might recover some heat at night or just use small amount of direct ventln. Of coarse greatly reduced cost of DIY HRV system would make it more advantageous. |
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Here is a picture of the DIY countercurrent HX (see post #3) in place:
On the right is the bypass, even more to the right is the box that houses filters and fans. |
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Is this a unit you built? Please share more details. -AC_Hacker |
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Just poking my head in here too. This cross heat recovery unit has a major drawback. It sends moist air out, and dry air in. With a rotating wheel you will condense the moisture from the outgoing air, and evaporate it to the ingoing air, so you keep a decent humidity level indoors. Also, this helps against the unit freezing up. If only the outgoing air is dehumidified, there will be a build up of water, which might freeze if the outdoor temperature is cold enough. We regularly have -20 here, so even the wheel based models have some issues. My unit is made by ener(.no), and they have two large aluminium fins and a 3 way air walve that directs incoming and outgoing air back and forth between them. To my mind this should work better when it is really cold, as the hot and cold side will alternate. Also, the unit should be somthing like 93% efficient when running in low mode.
-Ko_deZ- |
I have only found large commercial "wheel" ERV's in the US. Anyone know of a "residential" sizes one? Ko deZ what is the brand name? 93% of what? How can two passing air flows do more than reach equilibrium? The same with relative humidity of the air flows. Without a HP extracting it.
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