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Water cooling tower
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EXERIMENTAL CALCULATIONS :

Diameter of Orifice, mm (d1) =34

Diameter of pipe, mm (d2) =68

Coefficient of discharge Cd= 0.6
Density of manometer fluid (water), w (kg/m3)  =1000

Density of air, (kg/m3)  =1.126

g = 9.81 m/s2

Flow rate = 70 ltr/hr

 S. No. T1 T2 T3 T4 T5 T6 R1(cm) R2(cm) QW (LPH) 1 19 17.5 38.6 36 44.5 30.5 5.6 9.5 3.9 2 19.5 18.1 35.4 34.4 43.7 28.3 3 12.1 9.1 3 20 18.7 35.1 34 44.1 28 0.2 14.1 13.9

CALCULATIONS :

=34.54 m

a1 =Cross Section area of Orifice, m2= 907.46 *10-6  m

a2 = Cross Section area of pipe, m2 =3629.84*10-6 m

= 0.01463 m3/s

= 0.0165 kg/s

=0.01944 kg/s

=1.178

From Enthalpy table, the enthalpy of entering air at a wet bulb temp i.e.17.5 0C is h1= 15.274 Btu/lb of air

=15.274 + 1.178(44.5-30.5)

=31.766 Btu/lb of air

 T,0F hwi hai T=T2 =63.5 hw =   -------- ha  = h1  =15.274 -------- T=T2 +0.1(T1-T2)=63.77 hw =32.12 ha  = h1+0.1(L/G)(T5-T6) =18.25 13.87 T=T2 +0.4(T1-T2)=64.56 hw =33.12 ha  = h1+0.4(L/G)(T5-T6) =27.19 5.93 T=T2 -0.4(T1-T2)=65.12 hw =33.62 ha  = h2-0.4(L/G)(T5-T6)= 19.84 13.78 T=T2 -0.1(T1-T2)=65.93 hw =34.11 ha  = h2-0.1(L/G)(T5-T6) = 28.78 5.33 T=T1  =66.2 hw =34.32 ha  = h2 = 31.76 2.56

Cooling range = T5-T6  = 140C

Temperature approach =T2-T6 = -130C

=

= 0.501

Now tower characteristics

=1.7535

On doing the similar calculations for different values of (L/G),we get the complete calculation table.From there we draw a graph between tower characteristics and (L/G).

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