Answer:
0.31
126.23 kg/s
Explanation:
Given:-
- Fluid: Water
- Turbine: P3 = 8MPa , P4 = 10 KPa , nt = 85%
- Pump: Isentropic
- Net cycle-work output, Wnet = 100 MW
Find:-
- The thermal efficiency of the cycle
- The mass flow rate of steam
Solution:-
- The best way to deal with questions related to power cycles is to determine the process and write down the requisite properties of the fluid at each state.
First process: Isentropic compression by pump
P1 = P4 = 10 KPa ( condenser and pump inlet is usually equal )
h1 = h-P1 = 191.81 KJ/kg ( saturated liquid assumption )
s1 = s-P1 = 0.6492 KJ/kg.K
v1 = v-P1 = 0.001010 m^3 / kg
P2 = P3 = 8 MPa( Boiler pressure - Turbine inlet )
s2 = s1 = 0.6492 KJ/kg.K .... ( compressed liquid )
- To determine the ( h2 ) at state point 2 : Pump exit. We need to determine the wok-done by pump on the water ( Wp ). So from work-done principle we have:
![w_p = v_1*( P_2 - P_1 )\\\\w_p = 0.001010*( 8000 - 10 )\\\\w_p = 8.0699 \frac{KJ}{kg}](https://tex.z-dn.net/?f=w_p%20%3D%20v_1%2A%28%20P_2%20-%20P_1%20%29%5C%5C%5C%5Cw_p%20%3D%200.001010%2A%28%208000%20-%2010%20%29%5C%5C%5C%5Cw_p%20%3D%208.0699%20%5Cfrac%7BKJ%7D%7Bkg%7D)
- From the following relation we can determine ( h2 ) as follows:
h2 = h1 + wp
h2 = 191.81 + 8.0699
h2 = 199.88 KJ/kg
Second Process: Boiler supplies heat to the fluid and vaporize
- We have already evaluated the inlet fluid properties to the boiler ( pump exit property ).
- To determine the exit property of the fluid when the fluid is vaporized to steam in boiler ( super-heated phase ).
P3 = 8 MPa
T3 = ? ( assume fluid exist in the saturated vapor phase )
h3 = hg-P3 = 2758.7 KJ/kg
s3 = sg-P3 = 5.7450 KJ/kg.K
- The amount of heat supplied by the boiler per kg of fluid to the water stream. ( qs ) is determined using the state points 2 and 3 as follows:
![q_s = h_3 - h_2\\\\q_s = 2758.7 -199.88\\\\q_s = 2558.82 \frac{KJ}{kg}](https://tex.z-dn.net/?f=q_s%20%3D%20h_3%20-%20h_2%5C%5C%5C%5Cq_s%20%3D%202758.7%20-199.88%5C%5C%5C%5Cq_s%20%3D%202558.82%20%5Cfrac%7BKJ%7D%7Bkg%7D)
Third Process: The expansion ( actual case ). Turbine isentropic efficiency ( nt ).
- The saturated vapor steam is expanded by the turbine to the condenser pressure. The turbine inlet pressure conditions are similar to the boiler conditions.
- Under the isentropic conditions the steam exits the turbine at the following conditions:
P4 = 10 KPa
s4 = s3 = 5.7450 KJ/kg.K ... ( liquid - vapor mixture phase )
- Compute the quality of the mixture at condenser inlet by the following relation:
![x = \frac{s_4 - s_f}{s_f_g} \\\\x = \frac{5.745- 0.6492}{7.4996} \\\\x = 0.67947](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%7Bs_4%20-%20s_f%7D%7Bs_f_g%7D%20%5C%5C%5C%5Cx%20%3D%20%5Cfrac%7B5.745-%200.6492%7D%7B7.4996%7D%20%5C%5C%5C%5Cx%20%3D%200.67947)
- Determine the isentropic ( h4s ) at this state as follows:
- Since, we know that the turbine is not 100% isentropic. We will use the working efficiency and determine the actual ( h4 ) at the condenser inlet state:
![h4 = h_3 - n_t*(h_3 - h_4_s ) \\\\h4 = 2758.7 - 0.85*(2758.7 - 181.170187 ) \\\\h4 = 1958.39965 \frac{KJ}{kg} \\](https://tex.z-dn.net/?f=h4%20%3D%20h_3%20-%20n_t%2A%28h_3%20-%20h_4_s%20%29%20%5C%5C%5C%5Ch4%20%3D%202758.7%20-%200.85%2A%282758.7%20-%20181.170187%20%29%20%5C%5C%5C%5Ch4%20%3D%201958.39965%20%5Cfrac%7BKJ%7D%7Bkg%7D%20%5C%5C)
- We can now compute the work-produced ( wt ) due to the expansion of steam in turbine.
![w_t = h_3 - h_4\\\\w_t = 2758.7-1958.39965\\\\w_t = 800.30034 \frac{KJ}{kg}](https://tex.z-dn.net/?f=w_t%20%3D%20h_3%20-%20h_4%5C%5C%5C%5Cw_t%20%3D%202758.7-1958.39965%5C%5C%5C%5Cw_t%20%3D%20800.30034%20%5Cfrac%7BKJ%7D%7Bkg%7D)
- The net power out-put from the plant is derived from the net work produced by the compression and expansion process in pump and turbine, respectively.
![W_n_e_t = flow(m) * ( w_t - w_p )\\\\flow ( m ) = \frac{W_n_e_t}{w_t - w_p} \\\\flow ( m ) = \frac{100000}{800.30034-8.0699} \\\\flow ( m ) = 126.23 \frac{kg}{s}](https://tex.z-dn.net/?f=W_n_e_t%20%3D%20flow%28m%29%20%2A%20%28%20w_t%20-%20w_p%20%29%5C%5C%5C%5Cflow%20%28%20m%20%29%20%3D%20%5Cfrac%7BW_n_e_t%7D%7Bw_t%20-%20w_p%7D%20%5C%5C%5C%5Cflow%20%28%20m%20%29%20%3D%20%5Cfrac%7B100000%7D%7B800.30034-8.0699%7D%20%5C%5C%5C%5Cflow%20%28%20m%20%29%20%3D%20126.23%20%5Cfrac%7Bkg%7D%7Bs%7D)
Answer: The mass flow rate of the steam would be 126.23 kg/s
- The thermal efficiency of the cycle ( nth ) is defined as the ratio of net work produced by the cycle ( Wnet ) and the heat supplied by the boiler to the water ( Qs ):
![n_t_h = \frac{W_n_e_t}{flow(m)*q_s} \\\\n_t_h = \frac{100000}{126.23*2558.82} \\\\n_t_h = 0.31](https://tex.z-dn.net/?f=n_t_h%20%3D%20%5Cfrac%7BW_n_e_t%7D%7Bflow%28m%29%2Aq_s%7D%20%5C%5C%5C%5Cn_t_h%20%3D%20%5Cfrac%7B100000%7D%7B126.23%2A2558.82%7D%20%5C%5C%5C%5Cn_t_h%20%3D%200.31)
Answer: The thermal efficiency of the cycle is 0.31