Coanda Posted November 23, 2023 Share Posted November 23, 2023 I was quite pleased with my first diy attempt, so now I'm planning version 1.1. Planning to add an extra core as well as streamlining the enclosure. I haven't seen it discussed anywhere so I'm wondering is it better to suck the air through the core(s) or blow, or is there no difference? I know the effects of a fan blowing can be felt much further than suction from the same fan. Link to comment Share on other sites More sharing options...
Pocster Posted November 23, 2023 Share Posted November 23, 2023 😙😗 Link to comment Share on other sites More sharing options...
RobLe Posted November 23, 2023 Share Posted November 23, 2023 Sucking is likely better than blowing for this application. Blowing is directional, and has significant turbulence - good for heat transfer admittedly, but it will vary hugely over the heat exchanger - not what you want. Sucking gives a more even laminar flow over the whole heat exchanger. No puns in there 🙄 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted November 23, 2023 Share Posted November 23, 2023 Just to add to the whole DIY theme, why not fit a venturi tunnel, small fan, large flow. Actually, why not make the heat exchanger a spiral venturi. Link to comment Share on other sites More sharing options...
Coanda Posted November 23, 2023 Author Share Posted November 23, 2023 1 hour ago, SteamyTea said: Just to add to the whole DIY theme, why not fit a venturi tunnel, small fan, large flow. Actually, why not make the heat exchanger a spiral venturi. Sorry, you're way over my head now. 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted November 23, 2023 Share Posted November 23, 2023 Just now, Coanda said: Sorry, you're way over my head now. The principle is quite simple. To get a fixed amount of air though a restriction, in a fixed time, you have to speed the air up. This reduces the pressure at the restriction. What you can do is add extra air at that point. That air gets sucked in and then dragged out. So more air movement for the same size fan/pump. It is what Dyson does quiet well, but he relies on the general public not realising that it was all formulised in 1738, by Daniel Bernoulli. 1 Link to comment Share on other sites More sharing options...
Pocster Posted November 23, 2023 Share Posted November 23, 2023 1 hour ago, Coanda said: Sorry, you're way over my head now. Off topic ? ( just my mind ! ) Link to comment Share on other sites More sharing options...
joe90 Posted November 23, 2023 Share Posted November 23, 2023 10 minutes ago, Pocster said: Off topic ? ( just my mind ! ) I was waiting fir that 🙄 1 Link to comment Share on other sites More sharing options...
JohnMo Posted November 23, 2023 Share Posted November 23, 2023 1 hour ago, SteamyTea said: The principle is quite simple. To get a fixed amount of air though a restriction, in a fixed time, you have to speed the air up. This reduces the pressure at the restriction. What you can do is add extra air at that point. That air gets sucked in and then dragged out. In simple terms, the same principle used by a carburettor, but that case the pressure drop is used suck fuel in Link to comment Share on other sites More sharing options...
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