To understand ecological systems and environmental impact, techniques can be used which combine thermodynamics with environment and ecology. Most assessments consider thermodynamics via energy, but it many feel that ecological and environmental factors are better understood through exergy. One rationale is that exergy, not energy, is often a measure of the potential for ecological and environme...

The bio-thermodynamic structures of a mixed native species plantation, a conifer plantation and an Acacia mangium plantation in Southern China were quantified over a period of 15 years based on eco-exergy methods. The efficiencies of structural development and maintenance were quantified through an integrated application of eco-exergy and emergy methods. The results showed that the storage of e...

Exergy-based methods provide engineers with the best information respect to options for improving overall thermodynamic efficiency of an energy conversion system. This paper presents results advanced exergy analysis air-to-water reversible heat pump whose performance was analyzed different working fluids. Environmentally deleterious refrigerants, i.e., R410A and R134a (baselines), their eco-fri...

Contents 1. Introduction 1.1. Irreversibility and exergy cost 2. Definitions and concepts 3. Cost accounting and the exergy cost theory 3.1. Calculation of average exergy costs 3.2.

Due to long life of steam power plants in Iran, transformation of steam cycles to combined cycles is under consideration. Bandar-Abbas steam power plant with capacity of 320 MW has been analyzed in this work. This old plant is located near the harbor city of Bandar-Abbas at southern Iran. Method of exergy analysis is used to study the current and the repowered systems. Optimum state of the repo...

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...

This investigation presents a theoretical evaluation of the use R450A replace to R134a in low and medium temperature heat pump systems. The energy, exergy, environmental enviro-economic analyzes pumps have been performed for two refrigerants (R134a its alternative R450A). thermodynamic analyses made source temperatures (10 oC 20 oC) six sink (from 30 55 oC). It has observed that R450A's mass fl...

Given the likelihood that carbon-based fuels will continue to play a major role in electricity generation, carbon capture and storage systems will be a necessary part of future generating capacity. With this research project, we aim to develop a framework for quantitative evaluation of existing and proposed carbon-capture technologies. This framework is based on an exergy-based systems analysis...

The paper reviews various representations of exergy and exergy losses in energy systems going from simple heat exchanger (heat transfer, dissipation and embedded exergy) to the exergy of full energy systems from fossil or non fossil resources (including the diffusion exergy). The systems shown include shell in tube heat exchangers, thermal power cycles, cogeneration, heat pump direct heating sy...

An integrated solar combined cycle system based on parabolic trough collector and power plant is proposed. The advanced socio-economic significance compared to traditional system. Plainly, the exergetic analyses (exergy destruction efficiency) via conventional methods are used for thermodynamic properties of components. In addition, exergy divided into endogenous, exogenous, avoidable, unavoida...