Question

We want to increase the air temperature from 14.4°C to 30°C by passing over a bank of brass tubes inside which steam at 100ºC is condensing (hed = 5680. The tubes (L-0.61 m, D.-1.27 cm, & wall thickness d=0.125 cm) are arranged in-line in a square pattern with a pitch of 1.9 cm inside a rectangular shell (0.61 m wide, 38 cm high). If the total mass flow rate of air is 4 kg/s, calculate the following parameters. Brass tubes 38 cm 0.61 m 1.9 cm 1.27 cm Air Steam 100°C

Answer 1

Solution: 14-4430 Tma 2 aur ka 0.026 wlink Pr = 0.71475 Properties of at M: 1.85805 kg/ma U= 1.56x45 mts Amina hl (S-2) 0.076 I'mo Umane a m 4 0.6768 dow 0.61* (17-1.27) Ammin = 52,45 kg/ml Amin - (Remeria 52. his x 1.27 x 107 = 36006, 2 1.85 x los Credine - 36000 (rims Reynold's number = alment 36000 0.25 Myselt hamber Nug'= 0.033 (Pe) O-4 (Ⓡ) Niusa 0.023 (36000) of (0.76.15) 0.26 Nus = 62.125 Nesselt number Nuga 6211 a/almost bool Number of required transverse vows, » No = 5 or 6 rows