A straight-condensing 10,000 kW turbine has a guaranteed steam rate of 5.90 kg/kW.hr when exhausting at 5.0 kPa. Exhaust steam enters the condenser at 92% quality, and it is estimated that fouling will decrease the overall coefficient by 30% during operation. Cooling water is available at 18 ℃, and for design purposes, 1 ½ in OD 16 BWG Brass tubes (thickness = 0.065 in, k=62 BTU/hrftF°.) are specified with 9 C° rise in cooling water, which circulates at 5 ft/s. Inside and outside film coefficients are hi=960 and ho=1474 BTU/hrft2F°. Design a condenser for this turbine, considering tube and boundary resistance as flat surfaces and neglecting any crossflow factor. Determine the following a) Effective overall coefficient of heat transfer b) Volume flow rate of cooling water c) Number of tubes for single pass d) Length of tubes
A straight-condensing 10,000 kW turbine has a guaranteed steam rate of 5.90 kg/kW.hr when exhausting at 5.0 kPa. Exhaust steam enters the condenser at 92% quality, and it is estimated that fouling will decrease the overall
coefficient by 30% during operation. Cooling water is available at 18 ℃, and for design purposes, 1 ½ in OD 16
BWG Brass tubes (thickness = 0.065 in, k=62 BTU/hrftF°.) are specified with 9 C° rise in cooling water, which
circulates at 5 ft/s. Inside and outside film coefficients are hi=960 and ho=1474 BTU/hrft2F°. Design a condenser
for this turbine, considering tube and boundary resistance as flat surfaces and neglecting any crossflow factor.
Determine the following
a) Effective overall coefficient of heat transfer
b) Volume flow rate of cooling water
c) Number of tubes for single pass
d) Length of tubes
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