4. Consider the Problem no. 3, if the efficiency at high pressure and low - pressure turbine is 76% and 75%, respectively, calculate the following: a. Net Work in kJ/kg b. Quality After Turbine Expansion in percent

4. Consider the Problem no. 3, if the efficiency at high pressure and low - pressure turbine is 76% and 75%, respectively, calculate the following: a. Net Work in kJ/kg b. Quality After Turbine Expansion in percent

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

answer 4 only

3. A reheat steam cycle has 13, 580 kPa of throttle pressure at the turbine inlet and a
37.50308414 atm reheat pressure, the throttle and reheat temperature of the steam is
1302 R, condenser pressure is 4.3 kPa, find the following:
a. Thermal Efficiency in percent
b. Heat Rejected in BTU/lb
4. Consider the Problem no. 3, if the efficiency at high pressure and low pressure
turbine is 76% and 75%, respectively, calculate the following:
a. Net Work in kJ/kg
b. Quality After Turbine Expansion in percent

Use these values when necessary:
1 kg 2.205 lb
°C to K (use + 273.15)
1 bar
100 kPa
1 atm
101.325 kPa
1 BTU
1.055 kJ 778 ft-lb
1 HP 0.746 kW 2545 BTU/hr
:
h
8 MPa and 480 °C
82 MPa
:
h
:
h
2 MPa and 460 °C
@60°C
:
Prat
he
hfg
St
Sig
V₂
3348.4 kJ/kg;
2963.145 kJ/kg
3379.5 kJ/kg;
-0.019940 MPa
- 251.13 kJ/kg
- 2358.5 kJ/kg
s 6.6586 kJ/kg - K
s 7.3147 kJ/kg - K
0.8312 kJ/kg - K
7.0784 kJ/kg - K
0.0010172 m³/kg

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