Performance Analysis of a Rankine Cycle Integrated With the Goswami Combined Power and Cooling CycleSource: Journal of Energy Resources Technology:;2012:;volume( 134 ):;issue: 003::page 32001Author:Ricardo Vasquez Padilla
,
Antonio Ramos Archibold
,
Gokmen Demirkaya
,
Saeb Besarati
,
D. Yogi Goswami
,
Muhammad M Rahman
,
Elias L. Stefanakos
DOI: 10.1115/1.4006434Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Improving the efficiency of thermodynamic cycles plays a fundamental role in reducing the cost of solar power plants. These plants work normally with Rankine cycles which present some disadvantages due to the thermodynamic behavior of steam at low pressures. These disadvantages can be reduced by introducing alternatives such as combined cycles which combine the best features of each cycle. In this paper, a combined Rankine–Goswami cycle (RGC) is proposed and a thermodynamic analysis is conducted. The Goswami cycle, used as a bottoming cycle, uses ammonia–water mixture as the working fluid and produces power and refrigeration while power is the primary goal. This bottoming cycle, reduces the energy losses in the traditional condenser and eliminates the high specific volume and poor vapor quality presented in the last stages of the lower pressure turbine in the Rankine cycle. In addition, the use of absorption condensation in the Goswami cycle, for regeneration of the strong solution, allows operating the low pressure side of the cycle above atmospheric pressure which eliminates the need for maintaining a vacuum pressure in the condenser. The performance of the proposed combined Rankine–Goswami cycle, under full load, was investigated for applications in parabolic trough solar thermal plants for a range from 40 to 50 MW sizes. A sensitivity analysis to study the effect of the ammonia concentration, condenser pressure, and rectifier concentration on the cycle efficiency, network, and cooling was performed. The results indicate that the proposed RGC provide a difference in net power output between 15.7% and 42.3% for condenser pressures between 1 and 9 bars. The maximum effective first law and exergy efficiencies for an ammonia mass fraction of 0.5 are calculated as 36.7% and 24.7%, respectively, for the base case (no superheater or rectifier process).
keyword(s): Pressure , Cooling , Turbines , Rankine cycle , Condensers (steam plant) , Kalina cycle , Steam , Water , Vapors , Temperature , Refrigeration , Fluids , Mixtures , Superheaters , Exergy , Industrial plants , Vacuum AND Condensation ,
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contributor author | Ricardo Vasquez Padilla | |
contributor author | Antonio Ramos Archibold | |
contributor author | Gokmen Demirkaya | |
contributor author | Saeb Besarati | |
contributor author | D. Yogi Goswami | |
contributor author | Muhammad M Rahman | |
contributor author | Elias L. Stefanakos | |
date accessioned | 2017-05-09T00:49:36Z | |
date available | 2017-05-09T00:49:36Z | |
date copyright | September, 2012 | |
date issued | 2012 | |
identifier issn | 0195-0738 | |
identifier other | JERTD2-926028#032001_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/148632 | |
description abstract | Improving the efficiency of thermodynamic cycles plays a fundamental role in reducing the cost of solar power plants. These plants work normally with Rankine cycles which present some disadvantages due to the thermodynamic behavior of steam at low pressures. These disadvantages can be reduced by introducing alternatives such as combined cycles which combine the best features of each cycle. In this paper, a combined Rankine–Goswami cycle (RGC) is proposed and a thermodynamic analysis is conducted. The Goswami cycle, used as a bottoming cycle, uses ammonia–water mixture as the working fluid and produces power and refrigeration while power is the primary goal. This bottoming cycle, reduces the energy losses in the traditional condenser and eliminates the high specific volume and poor vapor quality presented in the last stages of the lower pressure turbine in the Rankine cycle. In addition, the use of absorption condensation in the Goswami cycle, for regeneration of the strong solution, allows operating the low pressure side of the cycle above atmospheric pressure which eliminates the need for maintaining a vacuum pressure in the condenser. The performance of the proposed combined Rankine–Goswami cycle, under full load, was investigated for applications in parabolic trough solar thermal plants for a range from 40 to 50 MW sizes. A sensitivity analysis to study the effect of the ammonia concentration, condenser pressure, and rectifier concentration on the cycle efficiency, network, and cooling was performed. The results indicate that the proposed RGC provide a difference in net power output between 15.7% and 42.3% for condenser pressures between 1 and 9 bars. The maximum effective first law and exergy efficiencies for an ammonia mass fraction of 0.5 are calculated as 36.7% and 24.7%, respectively, for the base case (no superheater or rectifier process). | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Performance Analysis of a Rankine Cycle Integrated With the Goswami Combined Power and Cooling Cycle | |
type | Journal Paper | |
journal volume | 134 | |
journal issue | 3 | |
journal title | Journal of Energy Resources Technology | |
identifier doi | 10.1115/1.4006434 | |
journal fristpage | 32001 | |
identifier eissn | 1528-8994 | |
keywords | Pressure | |
keywords | Cooling | |
keywords | Turbines | |
keywords | Rankine cycle | |
keywords | Condensers (steam plant) | |
keywords | Kalina cycle | |
keywords | Steam | |
keywords | Water | |
keywords | Vapors | |
keywords | Temperature | |
keywords | Refrigeration | |
keywords | Fluids | |
keywords | Mixtures | |
keywords | Superheaters | |
keywords | Exergy | |
keywords | Industrial plants | |
keywords | Vacuum AND Condensation | |
tree | Journal of Energy Resources Technology:;2012:;volume( 134 ):;issue: 003 | |
contenttype | Fulltext |