Question

EPT 228 SULIT EPT 228 -10- Question 6 Soalan 6) A heating system in a factory involves the transport of water with temperature of 110 °C ata rate of 0.1 m'/s through a pipe with the same elevation. The length of the pipe is 50 m with diameter of 0.15 m was made from stainless steel (friction factor,fe-0.00829). The fluid pressures at the water heater and receiving point are the same. The water is transported using electrical pump motor with 80 % efficiency. [Satu sistem pemanas dalam sebuah kilang melibatkan penghantaran air dengan suhu 110 C pada m's melalui satu paip dengan ketinggian yang sama. Panjang paip ialah 50 m dengan garis pauscat 0.15 m diperbuat daripada keluli tahan karat (aktor geseran f 0.00829). Tekanan-tekanan cecair di pemanas air dan di titik penerimaan adalah sama. Air tersebut dipindahkan menggunakan pam motor elekarik dengan kecekapan 80%.] (a) Calculate the pressure drop, head loss and power consumption of the system for pumping. [Kirakan susutan tekanan, kehilangan turus dan pengunaan kuasa sistem tersebut untuk mengepam (10 Marks/ Markah) (b) What are the new pressure drop, head loss and power consumption if the stainless steel pipe is replaced with cast iron pipe (friction factor,rn 0.0162). Conclude the effect of this pipe replacement. Apakah susutan tekanan, kehilangan turus dan pengunaan kuasa sistem untuk paip keluli tuhan karat diganilkan dengan paip besi tuang laktor geseran,fa1,mpukan kesan penukaran paip ini.) mengepam yang baru jika (10 Marks/ Markah)

Answer 1

Pipe with same elevation that is (Z1=Z2).cast iron pipe has higher friction value than that of stainless steel.

GTIvEN DATA Q = 0.1 m3 Z- Z2 (Same elevation) - 015 m st= o.oosa9. (Stainless steel) eficiency) TO FIND (D Pressure drop (I) heod loss (ii) pawer consumption of electric motor. Solu tion for a) Q= A-v (cont inuity eauation ー5659

Targ we isbach eauation for和ndtng out heat loss due to ricHon. wheye, 千YÍCH on扣ctor length of Pipe Vs Velody 01 unter qn Pipe Diameter ol pìpe. 2 f0.008 99 x 50 x (5 6 52) = 4.51 m Pressuro drop O D 二0.008 29メ50メ(5.6592x looo 2.χ0-15 144.246 kPa Ap = Pi-P2

= 981x103 xo 1メ ヰ:51 0.8 (b) Solution = 0.016 ㄴ Head loss due to打iction 2aD = 0.0162 $ 50 x( 5.659) Pressure drop. 365 (5-65*)メ 2. (5-659) 100 ー00162 x 50 R-陨ニ186, 465 kpal

4 = 9.81 X103 X o.1x 8.04 o .8 Conclusion- Du to Pipe ne placement, that is stainless steel cast won pipe, because ot that) elect Yic mo toY increased yom um P Hon ocueY Cons 5.53kw to l08o8 kw That S 15 o power consumphion increased