8/12/2019 Tugas SPD

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Tugas Pembangkit Daya

1. A simple steam power cycle uses solar energy for the heat input. Water in the cycle enters the pump as a saturated liquid at 40 o C, and is pumped 2 bar. t then e!aporates in the boiler atthis pressure, and enters the turbine as saturated !apor. At the turbine e"haust the conditionsare 40 o C and 10# moisture. $he flow rate is 1%0 &g'h.

(etermine)a* the turbine isentropic efficiency)b* the net wor& output)c* the cycle efficiency)d* the area of the solar collector needed if the collectors pic& up 0.%+ &W'm 2

)2.4*

2. A +%0 W steam power plant operates with turbine inlet at 100 bar, %%0 o C and condenser pressure at 0.0% bar. $here are three feedwater heaters placed optimally as follows- )i* the h.p.heater is of the closed type with drains cascaded bac&ward, )ii* the i.p heater is of the opentype, and )iii* the l.p. heater is of the closed type with drains pumped forward. ach of theturbine sections has the same isentropic efficiency of /0#. $he pumps ha!e isentropicefficiencies of +0#.Calculate)a* the mass flow rate of steam at turbine inlet)b* the mass flow rate of cooling water in the condenser, if it undergoes a 10 o C temperature

rise)c* the cycle efficiency)d* the cycle heat rate

)2.1%*

. ebuah si&lus 3an&ine ideal beroperasi dengan uap /0 bar dan %00 o C pada wa&tu masu&turbin, dan suhu &ondensor 40 o C.

itunglah efisiensi dan rasio &er5a si&lus ini untu& &asus &asus beri&ut-)a* tanpa pernanas air umpan)b* satu pemanas air umpan 5enis terbu&a)c* satu pemanas air umpan 5enis tertutup dengan &urasan ber5en5ang mundur &e &ondensor )d* satu, pemanas air umpan 5enis tertutup dengan &urasan dipompa&an ma5u.(alam setiap &asus itu pemanas air umpan ditempat&an secara optimal.6una&an $(( 7 2,% o C.

4. n a reheat regenerati!e steam cycle, steam enters the h.p. turbine at +0 bar, 4+0o

C ande"pands to 8 bar. $he steam is then reheated to 440 o C before entering the l.p. turbine, whereit e"pands to the condenser pressure of 0.0+ bar. team e"tracted from the h.p. turbine at 20

bar is fed to a closed feedwater heater, from which the drain at 20% o C is cascaded to an openfeedwater heater through a trap. team e"tracted from the l.p. turbine at bar is also fed intothe open feedwater heater, from which the total flow is pumped into the steam generator. $henet power output of the cycle is 100 W. Assuming ideal processes.(etermine-)a* the cycle efficiency)b* the rate of steam generation in &g'h.

)2.21*

8/12/2019 Tugas SPD

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%. A pressuri9ed water reactor power plant operates at pressures and temperatures as shown in:igure below. $he steam lea!ing the heat e"changer is at %0 bar, dry saturated and the

condensate is saturated to the saturation temperature of the bled steam at % bar in an open feedheater. Assuming all processes to be ideal and neglecting pump wor&.

stimate-)a* the ratio of the wor&ing fluids in the two circuits)b* the fraction of the steam supply which is bled from the turbine)c* the cycle efficiency.

)2.22*