Comparative Study of Using Water and R-134a as Cooling Medium in the Condenser of a Steam Power Plant

2014 ◽  
Author(s):  
Khaled Yousef ◽  
Abebayehu Assefa ◽  
Ahmed Hegazy ◽  
Abraham Engeda
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Comparative Study ◽  
Thermal Efficiency ◽  
Analytical Study ◽  
Steam Power ◽  
Cooling Fluid ◽  
Steam Power Plant ◽  
Cooling Medium ◽  
R 134A

This paper presents a comparative analytical study of using water and R-134a as cooling medium in the condenser of a steam power plant (SPP). In this study, a shell-and-tube cross-flow heat exchanger has been considered. Because of its direct effect on cycle thermal efficiency, the condenser of the SPP has been continuously improved over the years. One of the ways of increasing the performance of a SPP is by reducing the condenser pressure and using low temperature cooling medium in the condenser. The lower the temperature of the cooling fluid circulating through the condenser tubes, the faster will be the steam condensation. This process increases the condensation rate as well as condenser heat transfer rate. Refrigerants have much lower temperatures and much higher heat transfer rates than water. In this comparative study of using R-134a or water as a cooling fluid in the condenser of a SPP, steam enters the shell side of a single-pass horizontal condenser and the condensate is collected at the bottom. Cooling fluid, “water or R-134a”, is fed into the tubes. The results of the analytical study indicated higher condensation rates and heat transfer for R-134a than water. Moreover, the exergetic and exergy efficiency analysis revealed that R-134a has higher values than water, which increase the power plant thermal efficiency and reduce the condenser size.

Comparative Study of Using R-410A, R-407C, R-22, and R-134a as Cooling Medium in the Condenser of a Steam Power Plant

2014 ◽  
Vol 137 (2) ◽  
Author(s):  
Khaled Yousef ◽  
Abebayehu Assefa ◽  
Ahmed Hegazy ◽  
Abraham Engeda
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Analytical Study ◽  
Steam Power ◽  
Steam Power Plant ◽  
Overall Heat Transfer Coefficient ◽  
R 134A

A step-by-step technique has been implemented in the analytical study of heat transfer and pressure gradient characteristics of refrigerants R-410A, R-407C, R-22, and R-134a used as cooling media in the condenser of a steam power plant. Refrigerants are optimized to replace water/air as coolant in the condenser of a steam power plant. Refrigerants have much lower temperatures and much higher heat transfer rates than water or air. The thermal resistances that affect heat transfer characteristics and surface condenser performance are included. The effect of inlet refrigerant temperature and mass flow rate are reported for the four refrigerants. Calculations are performed at two inlet refrigerant temperatures −21 °C and −30 °C and mass flow rate ranging from 92.905 to 132.905 kg/s. The results revealed that the overall heat transfer coefficient, heat transfer rate, and condensation rate increased with refrigerant mass flow rate, with higher values at lower inlet refrigerant temperatures. For a given refrigerant mass flow rate and inlet temperature, the analytical study indicated that R-410A has higher values of overall heat transfer coefficient, heat transfer rate and condensation rate than R-407C, R-22, and R-314a, respectively. Moreover, it is found that R-410A, at −30 °C and 132.905 kg/s, is superior in condensing all steam entering the condenser than the other refrigerants; this corresponds to higher exergy efficiency. The condenser pressure was observed to be slightly higher for R-410A than the other refrigerants.

Comparative Study of Using R-410A, R-407C, R-22 and R-134a as Cooling Medium in the Condenser of a Steam Power Plant

2014 ◽  
Author(s):  
Khaled Yousef ◽  
Abebayehu Assefa ◽  
Ahmed Hegazy ◽  
Abraham Engeda
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Analytical Study ◽  
Steam Power ◽  
Steam Power Plant ◽  
Overall Heat Transfer Coefficient ◽  
R 134A

A step-by-step technique has been implemented in the analytical study of heat transfer and pressure gradient characteristics of refrigerants R-410A, R-407C, R-22 and R-134a used as cooling media in the condenser of a steam power plant. Refrigerants are optimized to replace water/air as coolant in the condenser of a steam power plant. Refrigerants have much lower temperatures and much higher heat transfer rates than water or air. The thermal resistances that affect heat transfer characteristics and surface condenser performance are included. The effect of inlet refrigerant temperature and mass flow rate are reported for the four refrigerants. Calculations are performed at two inlet refrigerant temperatures −21 °C and −30 °C and mass flow rate ranging from 92.905 to 132.905 kg/s. The results revealed that the overall heat transfer coefficient, heat transfer rate and condensation rate increased with refrigerant mass flow rate, with higher values at lower inlet refrigerant temperatures. For a given refrigerant mass flow rate and inlet temperature, the analytical study indicated that R-410A has higher values of overall heat transfer coefficient, heat transfer rate and condensation rate than R-407C, R-22 and R-314a, respectively. Moreover, it is found that R-410A, at −30 °C and 132.905 kg/s, is superior in condensing all steam entering the condenser than the other refrigerants; this corresponds to higher exergy efficiency. The condenser pressure was observed to be slightly higher for R-410A than the other refrigerants.

Performance Analysis of a Steam Power Plant with Different Governors

1998 ◽  
Vol 35 (2) ◽  
pp. 147-154
Author(s):  
Chawdhurry Bhurtun
Keyword(s):  
Power Plant ◽  
Performance Analysis ◽  
Comparative Study ◽  
Learning Control ◽  
Practical Application ◽  
Steam Power ◽  
Steam Power Plant ◽  
Engineering Software ◽  
Steam Plant

A comparative study of three steam plant governors is made using MATLAB. Such an exercise trains students in using engineering software for simulation. It also adds motivation to learning control as a subject by showing the practical application of the theory taught in class.

CORRESPONDENCE. THERMAL EFFICIENCY OF STEAM POWER PLANT.

1946 ◽  
Vol 26 (8) ◽  
pp. 553-556
Author(s):  
C G CARROTHERS ◽  
J R FINNIECOME ◽  
H S HORSMAN
Keyword(s):  
Power Plant ◽  
Thermal Efficiency ◽  
Steam Power ◽  
Steam Power Plant

Optimum Turbine Extraction Pressures for Maximum Efficiency in Steam Power Plant Cycle

2003 ◽  
Author(s):  
Sepehr Sanaye ◽  
Behrooz Farshi ◽  
Hashem Turk
Keyword(s):  
Power Plant ◽  
Thermal Efficiency ◽  
Optimization Techniques ◽  
Maximum Efficiency ◽  
Feed Water ◽  
Steam Power ◽  
Steam Power Plant ◽  
Water Heaters ◽  
Optimization Search ◽  
Steam Cycle

In design of a real steam power plant cycle with seven or eight open and closed feed water heaters, choosing the appropriate turbine extraction pressures has important effect on the cycle efficiency. By considering the steam cycle thermal efficiency as an objective function, various optimization techniques including the Full Search, Hook-Jeeves and Nelder-Mead schemes were applied for selecting the proper arrangement of feed water heaters and the optimum steam turbine extraction pressures. In order to optimally design and accurately analyze the behavior of steam power plant cycles, a modular software based on object oriented programming has been developed. Steam cycle elements used in this software while forming a set of independent objects, collectively present an inter-related behavior. In the design environment of the software, a complete steam cycle power plant can be visually designed and analyzed. The correct performance of this software in calculation of the state variations at various cycle points and the cycle thermal efficiency was checked and verified. The values of extraction pressures and mass flow rates at the optimum design point were assessed and found to be in agreement with the corresponding values of existing power plants. Based on the literature available, incorporation of all the design features involving modular aspect with optimization search using several algorithms and comparisons made of the results with actual power plant performances have not yet been successfully accomplished in a software package.

scholarly journals ANALISIS KINERJA AIR HEATER DI PLTU ASAM-ASAM UNIT 2

JTAM ROTARY ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 17
Author(s):  
Irawan Irawan ◽  
Aqli Mursadin
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Power Plant ◽  
Transfer Coefficient ◽  
Air Temperature ◽  
Temperature Ratio ◽  
Water Heater ◽  
Steam Power ◽  
Air Heater ◽  
Steam Power Plant

Indonesia as one of the largest coal producers utilizes this advantage by establishing a steam power plant, one of which is Borneo south PLTU power plant PT.PLN (persero) south of Borneo and Central Borneo Asam-Asam generation sector. One important component of PLTU is air heater to raise the combustion air temperature. Initial heating of ljungstrom type lattest regenerative air  heater in PLTU Asam-Asam unit 2 is carried out cleaning and maintenance on seal and gas side surfaces to optimize heat transfer coefficient and ratio of air intake ratio exposed by forced draft fan and air heated by flue gas in heater air heater elements and transferred to the combustion chamber to make efficient use of new fuel. Measurements were carried out on August 9, 2017 for 2 hours to find out the average value of heat transfer coefficient and temperature comparison of entry and exit from air heater of Asam-Asam unit 2 steam power plant. This research was conducted to find out the value of heat transfer coefficient and air temperature ratio with measurement on the inlet and outlet for two hours. The results of the air heater performance analysis in in PLTU Asam-Asam unit 2 steam power plant in terms of the highest heat transfer coefficient was 62.75 W/m^2.℃ at 2:04 PM, while the lowest heat transfer coefficient was 62.37 W/m^2.℃ at 3:10 PM, and the average heat transfer coefficient is 62.50 W/m^2.℃ . While the highest water heater ratio 9.70 at 3:44 PM and the lowest ratio 8.32 at minute 3:09 PM, and the average water heater ratio 9.01. Heater water heater elements in good condition and performance in receiving and releasing heat. Keywords: Air Heater,  Heat Transfer Coefficient, Temperature Ratio,  Heating  Elements

Cracks on the Roots of Turbine Blades of the Low-Pressure Turbine in a Steam Power Plant

2015 ◽  
Vol 52 (4) ◽  
pp. 214-225 ◽  
Author(s):  
E. Plesiutschnig ◽  
R. Vallant ◽  
G. Stöfan ◽  
C. Sommitsch ◽  
M. Mayr ◽  
...  
Keyword(s):  
Power Plant ◽  
Turbine Blades ◽  
Low Pressure ◽  
Steam Power ◽  
Steam Power Plant ◽  
Low Pressure Turbine
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