Question

O 20.34 w QUESTION 15 15-20 Water at 15°C is to be heated to 55 C by passing it over a bundle of 4m 1 ng 1㎝ diameter resistance heater rods man tained at 90c water approaches the heater rod bundle in normal direction at a mean velocity of 09 m/s. The rods arc arranged in-line with longitudinal and transverse pitches 4 cm and 3 cm respectively. Assume NL > 16. use k-О631 wm.к, o-992. 1 kg/m3. Cp-41 79JAg K, , O.653X 103 kg sm Pr 4.32 and Pts- 1.96 whenever needed then Determine QUESTION 18 0 3920g 060.30c 52.5c 43.10c QUESTION 19 Determine the O 19.41 Mw 0.45 Mw O 60.53 MW QUESTION 20 to 196

Answer 1

ate at rope tie s - 992-I K3/m3 el je O-653メ10r3 o·36 0-63 4.32、0.25- x 4-.32 x I-9 go . 0612. iveni - heat tron 18302 , 8612

90s) S -T 4tAn - 52.4837 Heat tansfer 107.90281<84 m= y - 107.902 x 419 x CSs- 1s-) 1.803チメ,of w 18302.8612 x 0-11, 6 Ni X 52.4837 No. of tobe ouo3'- ㈧. 1206Tl.go.-'9 NL= 14-9-4-9