Fórum | MyPower.CZ | Obnovitelné zdroje energie - energetická soběstačnost | Poslední návštěva: pát čer 09, 2023 12:33 pm
MareC3k píše:Pozreli ste niekto ako su otocene ventilatory v Axpertovi MSXE? ja ich mam otocene smerom dole... t.zn. tahaju cez horne mriezky cez menic a fukaju dole pod menic... proti smeru stupania tepleho vzduchuna inom Axperte KS co mam su ventilatory otocene opacne, tahaju zo spoda a fukaju cez menic a vyfukuju cez horne mriezky - podla mna by to takto malo byt spravne.
abrams píše:Zdravím ,
a co takhle ty větráky otočit o 180°aby nasávali vzduch zespod a tlačili jej nahoru do škatule . Bojovat proti fyzikánlím zákonům (tahat teplý vzduch dolů) je pěkná konina. Nemluvě o vyšší účinnosti chlazení podpořenému komínovým efektem .
Elektronům zdar
To cut a long story short, with the fans in the original direction (blowing out of the bottom of the unit), at 3.8 kW load, it quickly reached 57°C. With the load reduced to 100 W (to compare better with my results), the temperature actually increased to 58°C, and remained there for at least 3 minutes. With zero load, it fell to just 57°C.
To prove this wasn't some artifact, we re-connected the 3.8 kW load, and the temperature went down to 56 then 57°C.
After the fans were reversed, with the 3.8 kW load, the highest temperature reached was 45°C. With the 100 W load, the temperature went up to 46°C (with the fans off), then reduced to 41°C after 5 minutes.
We were pretty slack about checking the PV charging power. With the original fan direction, the two measurements we noted were 300 W and 1200 W. At the end, with the 41°C figure, the solar input was about 300 W. So we waited for some sun; it rose to 1.2 kW. This only ran the fans a little harder, and reduced the temperature to 40°C.
It seems that with the fans blowing down as standard and 100 W of load, the main effect of the fan was to precisely cancel the benefits of natural convection .
In summary, the fan direction change gives a 12°C improvement at high loads. At 50% load, there is an improvement, but only four degrees.
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