Exergy evaluation and exergoeconomic optimization in the Tehran international tower, Iran
hamidreza
vafaei
author
text
article
2020
per
In this research, exergy assessment and exergoeconomic optimization for Tehran international tower, which is the tallest building in Iran, were carried out. This high-rise tower with 220 square meter structure located in 35000 square meter site and has a single plant room which includes three double effect steam chillers with 850 tons of refrigeration capacity. For the generation of the required amount of steam to use in chillers and steam heat exchangers as well as two steam boilers with 3.78 kg/s capacity, a new scenario was considered. Boilers output steam pressure and temperatures are 9.8 bar and 152 Celsius degrees, respectively. For assessment, the cycle, firstly thermodynamic diagram of the cycle has been drawn and for all the points thermodynamic properties have been defined. After regarding energy equations and rules, energy evaluation considered for all equipment. In the next step, exergy assessment started and all effective factors on it were calculated. By determination major effective factors, exergoeconomy evaluation has been done using EES software. In conclusion, the results show that the best fitted thermodynamic properties for chiller input and boiler input-output points can cause improvement the first and second thermodynamic law and reduction in exergy streams costs.
New Science and Technology
مرکز دانش بنیان فن پایا
( فناوری های پایش آلودگی هوا و آب و سامانه های انرژی)
2783-1094
2
v.
1
no.
2020
122
131
https://www.jsat.ir/article_107537_e11f6184afb33fe43a4343f9f1fa2977.pdf
Carbon Footprint modelling in F Class Triple Pressure Combined Cycle with Focus on Pressure of Drums
fatemeh
dalir
دانشکده محیط زیست، دانشگاه تهران
author
text
article
2020
per
Carbon Footprint modelling in F Class Triple Pressure Combined Cycle with Focus on Pressure of Drums The consequences of climate change has been growing every day on human beings life. For combating and limiting the the earth temperature rise to 2 degree celcius, scientists follow two paths, up to date low carbon technology and incrising the resilience.Iran is among the top ten countries which emits greenhouse gases and according to INDC in UNFCCC, the emission can be reduced to 12% by 2030 inline wit BAU scenario. Up grading E class gas turbine to F class and using triple pressure heat recovery steam generator can produce more power and less carbon footprint. In combined cycles, parameters like pressure of drums and pinch are of high importance that can effect power and carbon footprint. Keywords “Triple pressure combined cycle power plant”, “Drum pressure”, “Carbon footprint”, “thermodynamical analysis” e e e e e
New Science and Technology
مرکز دانش بنیان فن پایا
( فناوری های پایش آلودگی هوا و آب و سامانه های انرژی)
2783-1094
2
v.
1
no.
2020
132
138
https://www.jsat.ir/article_107616_03f647f4473a9ac4ab54637167292648.pdf
Paris Agreement and Emission Mitigation in Iran Power Industry
yavar
anani
Engineering Deputy of Power Section, MAPNA Group
author
zahra
Gomar
Engineering Deputy of Power Section, MAPNA Group
author
fatemeh
dalir
دانشکده محیط زیست، دانشگاه تهران
author
text
article
2020
per
Paris Agreement and Emission Mitigation in Iran Power Industry The consequences of climate change has been growing every day on human beings life. For combating and limiting the the earth temperature rise to 2 degree celcius, scientists follow two paths, up to date low carbon technology and incrising the resilience.Iran is among the top ten countries which emits greenhouse gases and according to INDC in UNFCCC, the emission can be reduced to 4 to 12% by 2030 inline wit BAU scenario. In BAU, the Iran emission is estimated to around 1782 million ton. Hence it required to mitigate the emission 71.28 million ton of CO2eq in conditional situation of INDC. In this paper the potentials of power industry for reducing emission is investigated. Keywords “Paris Agreement”, “emission mitigation”, “Power Industry” e e e e e e e e e e e e e e e e e e e e
New Science and Technology
مرکز دانش بنیان فن پایا
( فناوری های پایش آلودگی هوا و آب و سامانه های انرژی)
2783-1094
2
v.
1
no.
2020
139
144
https://www.jsat.ir/article_107618_1b465ce2601769bd26b7aa4b3b4bd63b.pdf
Thermodynamic Analusis and Optimization of F Class Triple Pressure Combined Cycle
fatemeh
dalir
دانشکده محیط زیست، دانشگاه تهران
author
text
article
2020
per
Thermodynamic Analusis and Optimization of F Class Triple Pressure Combined Cycle Combined cycle powerplant is one of the most effective power generation means. While the efficiemcy is higher than others, its flexibility and instant start up are also the key factors. In this paper thermodynamical analysis and optimization of of F class triple pressure power plant is investigated. For achivieng the maximum power, the pressure of drums must be designed to LP=3.74 bar و IP=25.96 bar وHP= 158.9 bar. In this case maxium steam turbine is 145.362 MW and for maximum of efficiency 58.34 the pressure mus be adjusted to LP=3.74 bar و IP=26.84 bar وHP= 142.6 bar. Keywords “Triple pressure combined cycle power plant”, “Drum pressure”, “Carbon footprint”, “thermodynamical analysis” - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - -
New Science and Technology
مرکز دانش بنیان فن پایا
( فناوری های پایش آلودگی هوا و آب و سامانه های انرژی)
2783-1094
2
v.
1
no.
2020
145
151
https://www.jsat.ir/article_107619_66a590f27279c8606b5438b84efbb6dd.pdf
Developing Energy Performance for a Petroleum Refining Industry Using Regression Analysis and Linear Multivariable Modeling
Mahdi
Shakouri
School of Environment, College of Engineering, University of Tehran, Tehran, Iran
author
Nasim
Shekari
MSc in Innovative and Sustainable Chemical Engineering, Chalmers University of Technology, Sweden
author
text
article
2020
per
In this research, the energy performance of a petroleum refining unit has been reviewed and analyzed within the process of energy management system implementation. According to the results of analysis done by the research team, an appropriate energy performance indicator with an accurate demonstration of the real data for the process unit has been provided. The studied case is a petroleum refining unit in Iran and the research team has developed energy performance indicator using regression analysis and multivariable modeling for the crude distillation unit of the plant. In order to develop the applied and reliable model for the studied case, a research team has focused on all energy carriers and utility flows as well as all potentially relevant parameters. Then, in order to identify the unified performance indicator, all the energy carriers and utility flows have been unified in an equivalent energy content to the primary energy. The developed model is considered as a baseline and it can be considered as a basis for evaluation of the energy performance.
New Science and Technology
مرکز دانش بنیان فن پایا
( فناوری های پایش آلودگی هوا و آب و سامانه های انرژی)
2783-1094
2
v.
1
no.
2020
152
156
https://www.jsat.ir/article_107953_846b38880b7abb56075eeafd8c46e020.pdf
Modeling of energy hub to supply water, heating and electrical demands of a cement factory
Mostafa
Mostafavi Sani
author
text
article
2020
per
This paper uses the energy hub concept to meet the electricity, heat and water demand of a cement plant in south of Iran. Given the cement plant’s high potential for waste heat recovery, two scenarios were considered using the hub energy concept based on energy, exergy, economic and environmental analyzes. Scenario 1: meeting the demands of the hub and purchasing/selling energy carriers including electricity, heating, freshwater as well as its production using gas turbine, steam turbine, boiler, Multi-Effect Desalination (MED) and Reverse Osmosis (RO) system. Scenario 2: meeting hub demands based on scenario 1 and recovering waste heat from the cement plant. By comparing the two energy supplying systems of the current case study and optimal energy hub, results showed that the Total Annual Cost (TAC) level decreased by about 37,000 $/year and exergy efficiency increased by 36%. Results indicate that upon optimization, the average of TAC when waste heat is recovered, is 27% of the condition when waste heat is ignored.
New Science and Technology
مرکز دانش بنیان فن پایا
( فناوری های پایش آلودگی هوا و آب و سامانه های انرژی)
2783-1094
2
v.
1
no.
2020
157
173
https://www.jsat.ir/article_108514_fc5cf9815fde5d27af981e8ffe609dfb.pdf