Uporabne informacije:
1 ft = 30.48 centimetrov
1 inch = 2.54 centimetrov
10 cf (cubic feet) = 0.28 m3
100 cf = 2.80 m3
ostale primerjave:
- Cubic feet to cubic meter chart
- Celsius to Fahrenheit converter
Quote:
1kW = 3500 BTU
3.Lighting
Lighting BTU = Total wattage for all lighting x 4
Air cooled hood BTU = wattage x 4 / 2
400= 200-250 cfm
600= 250-300 cfm
1k = 300-350 cfm
^ is just a guide cfm per hood will be on your ducting/SP....
Tukaj sem naredil izračun za 250W HPS v cooltubeu:
250 x 4 / 2 = 500
500 = 250 cfm (po shemi v quoteu)
250 cf/m = 7 m3/m
7 m3 x 60 min = 420 m3/h
Tukaj ne vem kaj sem ga pocitral, ampak mislim, da je teh 420 m3/h mišljenih za idealno temparaturo, kar je 72°F oz 22.2 °C (sklepam po textu na začetku).
Quote:
air exchange aka intake/exhaust
complete air exchange every 4-5 minutes is average for a grow room/greenhouse (co2 control)....
for heat control (no a/c) i like to use 2.5 minutes {1M is best imo}
m = air exchange in min's
l x w x h = cf / m = cfm
lets use are room from above as a sample
3 x 3 x 8 = 72 /2.5 = 28.8 (30)
highend turn over = 72cfm
lowend turn over = 30cfm
mere mojega boxa v ft:
2,1 x 2,6 x 4 = 22,5 cf/m = 22,5 cf / 3 = 7,5 cfm
highend: 23 cfm
lowend: 8 cfm
23 cfm = 0.65 m3/min
0.65 x 60 = 39 m3/h
Takšen bi moral biti pretok zraka v box za popolno menjavo v 3 minutah. Notri nisem upošteval drugih toplotnih virov, kot je luč (čeprav je v cooltubeu). Če bi 250W HPS v cooltube-u kot toplotni vir enačil s 75W HPS bi bil izračunu dodal:
Quote:
1000W HPS = 300 - 350 cfm
75W HPS = 20 - 30 cfm (25 approx.)
23 cfm + 25 cfm = 48 cfm (50 cfm)
50 cfm = 1.41 m3/m
1.41 x 60 = 84,6 m3/h
Upam, da bodo komu te formulce prišle prav!
LP
Pa če sem kje zajebal povejte, mal je že pozna ura.
