Steam at 1.6 MPa and 250°C is being throttled by an adiabatic steam valve to reduce its pressure to 0.5 MPa before it is being delivered to a heat exchanger (shown in Figure 1). At valve outlet, the steam at18,000 kg/hour flow into an adiabatic heat exchanger as hot fluid. Cooling water from water tap is used to cool the steam by circulating the water through the tubes inside the heat exchanger. At heat exchanger outlet, the cooling water temperature increased by 20°C as it passing through the heat exchanger, and steam leaves the heat exchanger as saturated vapor at 200 kPa. Determine: (a) the temperature of the steam at heat exchanger inlet; and (b) the mass flow rate of the cooling water required. (Note: Use specific heat of cooling water at constant pressure as 4.18 kJ/kg, C)

Steam at 1.6 MPa and 250°C is being throttled by an adiabatic steam valve to reduce its pressure to 0.5 MPa before it is being delivered to a heat exchanger (shown in Figure 1). At valve outlet, the steam at18,000 kg/hour flow into an adiabatic heat exchanger as hot fluid. Cooling water from water tap is used to cool the steam by circulating the water through the tubes inside the heat exchanger. At heat exchanger outlet, the cooling water temperature increased by 20°C as it passing through the heat exchanger, and steam leaves the heat exchanger as saturated vapor at 200 kPa. Determine: (a) the temperature of the steam at heat exchanger inlet; and (b) the mass flow rate of the cooling water required. (Note: Use specific heat of cooling water at constant pressure as 4.18 kJ/kg, C)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Steam at 1.6 MPa and 250°C is being throttled by an adiabatic steam valve to reduce its
pressure to 0.5 MPa before it is being delivered to a heat exchanger (shown in Figure 1). At
valve outlet, the steam at18,000 kg/hour flow into an adiabatic heat exchanger as hot fluid.
Cooling water from water tap is used to cool the steam by circulating the water through the
tubes inside the heat exchanger. At heat exchanger outlet, the cooling water temperature
increased by 20°C as it passing through the heat exchanger, and steam leaves the heat
exchanger as saturated vapor at 200 kPa. Determine:
(a)
the temperature of the steam at heat exchanger inlet; and
(b)
the mass flow rate of the cooling water required.
(Note: Use specific heat of cooling water at constant pressure as 4.18 kJ/kg.C)
Heat Exchanger
Steam
Steam
valve
Cooling
Water

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