In this problem, water is used to cool saturated steam using the heat exchanger sketched in Fig. 4.24. Steam, with a mass flux of 4 kg/s, enters as a saturated vapor at 20 kPa and leaves as a saturated liquid. If the cooling water is allowed to experience a temperature rise of 40ºC, its mass flux should be nearest:
A) 77 kg/s
B) 151 kg/s
C) 202 kg/s
D) 236 kg/s
D) 236 kg/s
let “s” represent steam and “w” represent water:
ms(hs2 ? hs1) = mw(hw1 ? hw2) = mw Cp,w?Tw
4 × ( 2609.7 ? 251.4) = m w × 1.0 × 40. ? m w = 236 kg/s
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