Exergy Analysis: Principles and Practice

1994 ◽  
Vol 116 (2) ◽  
pp. 285-290 ◽  
Author(s):  
M. J. Moran ◽  
E. Sciubba

The importance of the goal of developing systems that effectively use nonrenewable energy resources such as oil, natural gas, and coal is apparent. The method of exergy analysis is well suited for furthering this goal, for it enables the location, type and true magnitude of waste and loss to be determined. Such information can be used to design new systems and to reduce the inefficiency of existing systems. This paper provides a brief survey of both exergy principles and the current literature of exergy analysis with emphasis on areas of application.

Author(s):  
Nikolay Tymchenko ◽  
◽  
Nataliia Fialko ◽  
Keyword(s):  

The data on the proven world reserves of traditional energy resources, as well an approximate timing of their exhaustion, are considered. In accordance with the forecasts of recent decades the interval of exhaustion of the main types of fuel-energy resources (coal, oil, natural gas, uranium) according to various estimates, ranges from 50 to 150 years.


Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 280
Author(s):  
Dmytro Levchenko ◽  
Andrii Manzharov ◽  
Artem Artyukhov ◽  
Nadiya Artyukhova ◽  
Jan Krmela

The article deals with the study on the efficiency of units for porous ammonium nitrate production. The ways which increase the effective implementation of energy resources are determined by including the ejector recycling module, heat and mass exchangers that utilize principles of regenerative indirect evaporative cooling, and the sub-atmospheric inverse Brayton cycle. Mixed exergy analysis evaluates all flows of the system contour as those of the same value. The target parameter for determining the efficiency of both systems is the ratio of the unit’s productivity to the exergy expenditures to produce the unit mass of the product. As a result, it is found that the mentioned devices and units enable to increase the efficiency of the basic scheme by 87%.


2014 ◽  
Vol 82 ◽  
pp. 146-153 ◽  
Author(s):  
Emin Açıkkalp ◽  
Haydar Aras ◽  
Arif Hepbasli
Keyword(s):  

2018 ◽  
Vol 42 (1) ◽  
pp. 182-195 ◽  
Author(s):  
Haili Hu ◽  
Hong Jiang ◽  
Jiaqiang Jing ◽  
Hongyu Pu ◽  
Jiatong Tan ◽  
...  

2016 ◽  
Author(s):  
S. Tesch ◽  
T. Morosuk ◽  
G. Tsatsaronis

The increasing demand for primary energy leads to a growing market of natural gas and the associated market for liquefied natural gas (LNG) increases, too. The liquefaction of natural gas is an energy- and cost-intensive process. After exploration, natural gas, is pretreated and cooled to the liquefaction temperature of around −160°C. In this paper, a novel concept for the integration of the liquefaction of natural gas into an air separation process is introduced. The system is evaluated from the energetic and exergetic points of view. Additionally, an advanced exergy analysis is conducted. The analysis of the concepts shows the effect of important parameters regarding the maximum amount of liquefiable of natural gas and the total power consumption. Comparing the different cases, the amount of LNG production could be increased by two thirds, while the power consumption is doubled. The results of the exergy analysis show, that the introduction of the liquefaction of natural gas has a positive effect on the exergetic efficiency of a convetional air separation unit, which increases from 38% to 49%.


Author(s):  
S. Habibbayli

After the restoration of the state independence of Azerbaijan, one of the main goals was to use natural resources freely, in the interests of the Azerbaijani people and state. Since the early 1990’s, several western companies have begun to show interest in the energy sources of the Caspian region. In the first years of independence, certain steps were taken to obtain energy resources and bring them to the world market. The “Contract of the Century” concluded on September 20, 1994, with 11 transnational oil companies worldwide, which laid the foundation of the oil strategy proposed by national leader Heydar Aliyev, allowed Azerbaijan to play an important role in the Caucasus and Caspian Sea region, turning it into one of the international centers for the production of energy resources. After the signing of the “Contract of the Century”, the key issue was finding favorable ways for oil and gas transit. The choice of Georgia as a transit country would meet the interests of Azerbaijan. Starting from 1999, the first oil was transported via the Baku-Supsa pipeline, and from 2006 on the Baku-Tbilisi-Ceyhan main export oil pipeline. Transportation of gas, along with oil, is carried out through Georgia. Gas is transported to Georgia by the end of 2006 through the Baku-Tbilisi-Erzurum gas pipeline and from June 2007 to Turkey. The Southern Gas Corridor, which is probably the largest gas pipeline project put forward by Azerbaijan, involving Georgia, delivers the Shahdeniz Phase 2 gas from the Caspian Sea to Europe. The South Caucasus Pipeline Project Expansion, part of this project, encompasses the construction of new pipelines and associated facilities in both Azerbaijan and Georgia. The opening ceremony of the first phase of the Southern Gas Corridor project was held at Sangachal Terminal on May 29, 2018. Within the framework of the AGRI (Azerbaijan, Georgia, Romania Interconnector) project, which is one of the energy projects connecting Azerbaijan and Georgia, it is planned to transport natural gas through the pipeline to the Black Sea shores of Georgia, where it will be liquefied and transported by tankers to the terminal in Romania’s Constanta port and then to the gas infrastructure of Romania and other European countries in the form of natural gas. Georgia is not only a transit country for Azerbaijan, but also one of the largest consumers of hydrocarbon reserves. The State Oil Company of Azerbaijan Republic (SOCAR) has been operating in Georgia since 2006. SOCAR's activities in Georgia are carried out through “SOCAR Georgia Petroleum”, “SOCAR Gas Export-Import”, “SOCAR Georgia Gas”, “SOCAR Georgia Gas Distribution”, “Black Sea Terminal” and others.


Author(s):  
Guillermo Valencia ◽  
Armando Fontalvo ◽  
Yulineth Cardenas ◽  
Jorge Duarte ◽  
Cesar Isaza

One way to increase overall natural gas engine efficiency is to transform exhaust waste heat into useful energy by means of a bottoming cycle. Organic Rankine cycle (ORC) is a promising technology to convert medium and low grade waste heat into mechanical power and electricity. This paper presents an energy and exergy analysis of three ORC-Waste heat recovery configurations by using an intermediate thermal oil circuit: Simple ORC (SORC), ORC with Recuperator (RORC) and ORC with Double Pressure (DORC), and Cyclohexane, Toluene and Acetone have been proposed as working fluids. An energy and exergy thermodynamic model is proposed to evaluate each configuration performance, while available exhaust thermal energy variation under different engine loads was determined through an experimentally validated mathematical model. Additionally, the effect of evaportating pressure on net power output , absolute thermal efficiency increase, absolute specific fuel consumption decrease, overall energy conversion efficiency, and component exergy destruction is also investigated. Results evidence an improvement in operational performance for heat recovery through RORC with Toluene at an evaporation pressure of 3.4 MPa, achieving 146.25 kW of net power output, 11.58% of overall conversion efficiency, 28.4% of ORC thermal efficiency, and an specific fuel consumption reduction of 7.67% at a 1482 rpm engine speed, a 120.2 L/min natural gas Flow, 1.784 lambda, and 1758.77 kW mechanical engine power.


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