نتایج جستجو برای: energy exergy sensitive study

تعداد نتایج: 4668323  

2014
Yueshi Wu Wlodzimierz Blasiak

A chemical equilibrium model was developed to predict the product composition of a biomass gasification system using highly preheated air and steam. The advantages and limitations of this system were discussed from a thermodynamic viewpoint. The first and second law analyses have been conducted for various preheating temperatures and steam/biomass mass (S/B) ratios. The results demonstrated tha...

Journal: :مهندسی بیوسیستم ایران 0
هادی باقری کارشناس ارشد مکانیک ماشین های کشاورزی، ایران ، تهران ، پاکدشت ، دانشگاه تهران (پردیس ابوریحان)، گروه فنی کشاورزی، دانشگاه تهران ـ پردیس ابوریحان اکبر عرب حسینی دانشیار (دکتری مکانیک ماشین های کشاورزی)، ایران، تهران، پاکدشت، دانشگاه تهران (پردیس ابوریحان)، گروه فنی کشاورزی، دانشگاه تهران ـ پردیس ابوریحان. محمدحسین کیانمهر استاد (دکتری مکانیک ماشین های کشاورزی)، ایران، تهران، پاکدشت، دانشگاه تهران (پردیس ابوریحان)، گروه فنی کشاورزی، دانشگاه تهران ـ پردیس ابوریحان.

in this paper the energy and exergy analyses in chamber drying process of thin layer drying of tomato in a forced solar drying was investigated. the experiments were carried out with two thicknesses of 5 and 7 and two airflows 0.5 m.s-1 and 1 m.s-1. during the experimental process, ambient temperature was between 22 and 36 , air relative humidity between was 14 and 50, and solar radiation range...

Journal: :journal of chemical and petroleum engineering 0
hossein ahamdi danesh-ashtiani islamic azad university of south tehran branch. hamid abdollah-zargar islamic azad university of south tehran branch.

utilization of fossil fuel for supplying of requires energy of desalination systems is common. on the other hand, solar energy is one of the high-grade energies in the world that can be found specifically in hot weather places. therefore, utilization of solar energy for operation of desalination systems will reduce greenhouse gases and is a good alternative way. common exergy analysis method (s...

Journal: :Entropy 2016
Pierre Marty Jean-François Hétet David Chalet Philippe Corrignan

With multiple primary and secondary energy converters (diesel engines, steam turbines, waste heat recovery (WHR) and oil-fired boilers, etc.) and extensive energy networks (steam, cooling water, exhaust gases, etc.), ships may be considered as complex energy systems. Understanding and optimizing such systems requires advanced holistic energy modeling. This modeling can be done in two ways: The ...

Journal: Gas Processing 2018

One of the industries with high potential for energy saving is the petrochemical industry. Ethylene and propylene production plants (olefin plants) – as a part of the petrochemical industry – are very energy intensive. So, any try to improve their energy consumption efficiency could lead to a high amount of energy saving. Iran’s petrochemical industry uses old technologies and components and du...

2010
C. Q. Ren

Of evaporative cooling or energy recovery potential in HVAC, the conventional thermodynamic analysis is based on the enthalpy of moist air. In fact, the available energy of moist air is its exergy and the available energy saving potential ought to be the exergy. Isoexergic lines on psychometric charts associated with different ambient states persuade us that exergy and enthalpy are completely i...

Journal: :international journal of energy and environmental engineering 2011
pierfrancesco palazzo

the mechanical aspect of entropy-exergy relationship, together with the thermal aspect usually consid-ered, leads to an extended formulation of physical exergy based on both maximum useful work and maximum useful heat that are the outcome of available energy of a thermodynamic system. this approach suggests that a mechanical entropy can be studied, in addition to the already used thermal entrop...

Mohammad Ali Akhavan Bahabadi Mojtaba Mirzakhani Siahkalroudi Pedram Hanafizadeh,

Nowadays, energy plays an important role in the economic and community development of country. Consequently, performance analysis of energy systems is one of the effective methods being used to prevent waste of energy resources. Among the different power generation technologies, steam power plants make a significant contribution to power generation in Iran, with a share of 47 % of electricity g...

Mohammad Ali Akhavan Bahabadi Mojtaba Mirzakhani Siahkalroudi, Pedram Hanafizadeh,

Nowadays, energy plays an important role in the economic and community development of country. Consequently, performance analysis of energy systems is one of the effective methods being used to prevent waste of energy resources. Among the different power generation technologies, steam power plants make a significant contribution to power generation in Iran, with a share of 47 % of electrici...

2010
Jung Park Dongsoo Jung Ki-Jung Park Yun-Bo Shim

This study presents an experimental comparison of energy, exergy flow and second law efficiency of R22 and its substitute R436b (hydrocarbon mixture of 52% of propane (R290) 48% of isobutene (R600a)), vapour compression refrigeration cycles. The vapour compression refrigeration cycle was initially designed to operate with R22. The primary objective of this paper is to analyze the system process...

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