View Policies

Show Attempt History

Current Attempt in Progress

Data for a regenerative vapor power cycle using an open and a closed feedwater heater, similar in design to that shown in the figure below, are provided in the table below. Steam enters the turbine at $\backslash (14\backslash$mathrm$\{$MPa$\},630^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ),$ state $1,$ and expands isentropically in three stages to a condenser pressure of $45$ kPa $,$ state $4.$

Saturated liquid exiting the condenser at state $5$ is pumped isentropically to state $6$ and enters the open feedwater heater. Between the first and second turbine stages, some steam is extracted at $1$ MPa $,$ state $2,$ and diverted to the closed feedwater heater. The diverted steam leaves the closed feedwater heater as saturated liquid at $1$ MPa $,$ state $10,$ undergoes a throttling process to $0\mathrm{.}2$ MPa $,$ state $11,$ and enters the open feedwater heater.

Steam is also extracted between the second and third turbine stages at $0\mathrm{.}2$ MPa $,$ state $3,$ and diverted to the open feedwater heater Saturated liquid at $0\mathrm{.}2$ MPa exiting the open feedwater heater at state $7$ is pumped isentropically to state $8$ and enters the closed feedwater heater. Feedwater exits the closed feedwater heater at $\backslash (14\backslash$mathrm$\{$MPa$\},170^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ),$ state $9,$ and then enters the steam generator

State $\backslash (\backslash$quad p$(\backslash$mathrm$\{$kPa$\})\backslash$quad T$\backslash$left$(\{\}^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash$right$)\backslash$quad h$(\backslash$mathrm$\{$~kJ$\}/\backslash$mathrm$\{$kg$\})\backslash$quad s$(\backslash$mathrm$\{$~kJ$\}/\backslash$mathrm$\{$kg$\}\backslash$cdot $\backslash$mathrm$\{$K$\})\backslash$quad x $\backslash )$

If the net power developed by the cycle is $300$ MW $,$ determine:

$($a$)$ the percent cycle thermal efficiency

$($b$)$ the mass flow rate into the first turbine stage, in $\backslash (\backslash$mathrm$\{$kg$\}/\backslash$mathrm$\{$s$\}\backslash ).$

$($c$)$ the magnitude of the rate of heat transfer from the working fluid as it passes through the condenser, in MW$.$

Part A

Your answer is correct.

If the net power developed by the cycle is $300$ MW $,$ determine the percent cycle thermal efficiency

$\backslash (\backslash$eta $\backslash )\backslash \%$

Hint

Attempts: $2$ of $4$ used

Part B

Your answer is incorrect.

If the net power developed by the cycle is $300$ MW $,$ determine the mass flow rate into the first turbine stage, in $\backslash (\backslash$mathrm$\{$kg$\}/\backslash$mathrm$\{$s$\}\backslash ).$

$\backslash (\backslash$dot$\{$m$\}\_\{1\}=\backslash )$ kg$/$s

Hint

Save for Later

Attempts: $2$ of $4$ used

Part C

The parts of this question must be completed in order. This part will be available when you complete the part above.