ψυχρομετρία 9+

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Transcript of ψυχρομετρία 9+

.Preheater battery= Supply fan= Cooling coil = Reheater battery = . Return air fan =

.

1. , 1 2 3 . (m1) (m2).

(m3). .

:

m1 + m 2 = m 3 :

m1 h1 + m2 h2 = m3 h3: m = (kg/s) h = (kJ/kg) .

2. , , .

:

H1-2 = m x Cp x (t2 - t1) :

H1-2 = m x (h2 - h1) :

H2-1 = m x Cp x (t2 - t1) :

H2-1 = m x (h2 - h1): H = (kW) m = (kg/s) Cp = , 1.01 kJ/kg degC. t = (oC) h = (kJ/kg) .

3. . . 100%. . . ( ) latently . 100% 100% . (ADP) . 1 2 3 .

H1-3 = m x (h1 - h3) :

H1-2 = m x (h1 - h2) :

H2-3 = m x (h2 - h3): H = (kW) m = (kg/s) h = (kJ/kg) .

: H1-2 = m x Cp x (t1 - t2) : H2-3 = m x hfg x (g2 - g3): H = (kW) m = (kg/s) Cp = , 1.01 kJ/kg degC.

t = (oC) hfg = , 2454 kJ/kg @20oC. g = (kg/kg dry air)

3.1 ADP. , .

ADP ADP.

. ( ). .

4.

. . . .

. .

.

.

.

.

.

.

. () () , . () = + () = + .

R . : = 9.0 kW = 2.25 kW = 9.0 kW + 2.25 kW = 11.25 kW. = / = 9 / 11.25 = 0.8 . R S.