03-20-19, 02:24 PM | #561 | |
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Ecorenovation - the bottomless piggy bank that tries to tame the energy hog. |
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09-17-19, 08:11 AM | #562 |
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Greetings! Just found your forum and your thread while googling I also want to build a recuperator. I am thinking of buying 1000x2000x1mm aluminium sheets, cutting them into 200x200 squares and then gluing the squares with silicon, maybe, or putting window sealing D type rubber bands and screwing them together; if silicon, then also some hard material to separate the sheets (silicon is liquid after all). I would like a counterflow, so I am thinking about building two of such cassettes. Al sheets are not a problem-non anodized one costs some 20eur, anodized one some 23eur. Now here are my questions:
1.what should be the gap between the sheets? Corrugated plastic holes you are using are some 5mm, so maybe I should plan the same? 2.what could be the heat power transfer (watts) of one such cassette and what could be the air speed (m/s) for good results? 3.should I build some fins or other things in my gaps inside cassettes to generate some turbulence? Or maybe build some forms (like 5mm high semisphere) from wood and with help of them and hammer bend some depressions into aluminium? Turbulent flow could collect more heat from surface than laminar one, right? For answering my questions-a bonus idea. I dont want to drill any walls, but I came across an idea-balcony door would open, making some 10cm gap at the side, the gaps at the top and bottom would be covered by "slice of pie" semicircle plastic, the side gap would face some plastic sheets with two holes and holes would be connected to my recuperator (air in, air out). I open balcony 10cm->there isnt a lot of cold air leaking in->the outside air interacts directly with my recuperator. You open door more-then its like simply opening the door |
02-12-20, 04:32 PM | #563 |
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FYI
Video of my prototype. Design and build https---://youtu.be/_kJB9LPhZDs Performance test results https---://youtu.be/fCgf1lCK4qQ I was blocked from directly posting links .. remove the "---" used above to fool the bot. |
02-12-20, 10:02 PM | #564 |
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I thought I'd let you know that you have to make a few more posts before you can share links.
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03-01-20, 04:21 AM | #565 |
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Were in Norway are you based?
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03-01-20, 04:32 AM | #566 |
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Has things changed since 2011? My exhaust air holds normally around 10 degrees C in the winter time, with the preheater working slightly to avoid freezing in the inlet. Expelling this relatively hot air for hours, must represent a loss in energy and money. Am I totally wrong? My inlet temp during winter is set to 18 degrees C, and returned inside air is normally in the area of 21-23 degrees C. The efficiency of my exchanger is very high due to enfalty construction, with heat recovery also from moist in the air. My system will in automatic mode and with the use of modbus sensors and modbus emulated knx and 1 wire sensors, be completely run by itself, with the minimum speed of 3%. Having way to much fresh air in the house when no-one is present, is a waste of energy....
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03-01-20, 04:35 AM | #567 | |
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03-21-20, 01:21 PM | #568 |
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Hello everyone.
I am currently in the early stages of designing a van conversion (Fiat Ducato) for full time living. One of the problems raised by many people doing this is the excess moisture buildup. Every conversion I saw uses roof mounted windows with fans installed. Some people stated that they are running the fans very frequently even during winter. I really do not like this approach and thought that HRV could be a better solution. Unfortunately I found no one doing this. My idea is to mount the heat exchanger beneath the floor and have the exhaust and intake below the vehicle. My thinking is that it would potentially result in cooler air in summer and protect the intake from rain ingress and I don't have to make holes in the roof. The total volume of air inside is about 14-16m3. I have 3 distinct spaces I would like to ventilate, the general living space (~8m3), bathroom (~2m3) and a storage space below bed (~4m3). I was thinking about using automotive cabin ventilation fans to move the air - readily available, built for longevity and relatively cheap, especially used ones. Do you think that this small of a system is viable? There has to be a reason that no one is doing it this way. If I could get 60-80% heat recovery I would be very happy. It sure would beat just pumping out the warm air through the roof windows. |
03-27-20, 03:46 PM | #569 |
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yes
I would bet on 3 main reasons. #1> Follow the leader. Most people do what they see other people do .. so it becomes a self full-filling loop .. people don't do it because they don't see other people doing it .. because they didn't do it , then other people don't see them doing it .. etc. #2> DIY OEM bought HRV is expensive .. it can be a fairly inexpensive not hard to make DIY version .. but most people lean away from DIY , some lean toward it .. but overall the majority of the population lean away from DIY. #3> Small Space This is 2 fold: 3a> Small spaces already cost small $ to heat and cool .. so inefficient methods (open windows in winter, etc) don't hit as hard , as they would for much larger spaces .. 50% of a heating bill on $20 is only $10 , but 50% on a heating bill of $2000 is $1000 , even though it's the same 50% either way. 3b> Small Spaces are already tight on space .. and HRV is just one more thing to suck of space .. so even those people who would otherwise do it , might choose to compromise and do without it because of the space limitations. |
11-06-20, 01:01 PM | #570 |
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Hello everyone. I am in process of gathering information for building my own unit (2 actually). As exchange core & motors/fans are heart of the device, i would like to ask for some recomendations. (I am from EU).
1. Needed air flow is cca 120-150m3/h, in normal operation. Motors have to be moisture resistant of course. Any ideas for fans? @LF-X mentioned Delta fans, which type did you buy? 2. Desire is to also return moisture (enthalpy exchanger), but i don't like the idea to have paper core. I see some comercial product nowadays have enthalpy exchanges that are not made out of paper and are washable. Does anyone know where(if) such exchange cores can be bought? (I noticed Zehnder is selling them as spare parts, but quite expensive). Thanks for information. |
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erv, heat recovery, hrv |
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