Ground heat is a renewable resource that is readily available for buildings in cool climates, but its relatively low temperature requires the use of a heat pump to extract it for heating. We developed a system that uses low temperature ground heat directly in a building wall to reduce transmission heat losses. The Active Low Exergy Geothermal Insulation Systems (ALEGIS) minimizes exergy demand ...

Four different forest restoration modes (Acacia mangium plantation, mixed-native species plantation, conifer plantation and Eucalyptus plantation) were evaluated using Energy System Theory and the emergy synthesis method. In addition, the eco-exergies of the four forest restoration modes were calculated, and combined with emergy and empower density to explore the restoration and selforganizatio...

beginning with a discussion of energy and exergy analysis definitions, the presented study provides a descriptive mathematical model for energy and exergy analysis for a co-current gas cooling tower. for this purpose using conservation laws of mass, energy and momentum, the variation of temperature and enthalpy of gas and liquid streams are predicted along the tower length and are used in order...

In this paper, a transcritical carbon dioxide power generation system based on vortex tube is studied, which has the advantage of self-condensation dioxide. The thermodynamic performance was investigated by establishing mathematical model. results showed that under fundamental working conditions, could output net 271.72 kW, and thermal efficiency as well exergy reach 7.38% 27.09%, respectively....

This study investigates the use of division algorithms to optimize size a desalination system integrated with microgrid based on wind turbine plant and battery storage supply freshwater cost, reliability, energy losses. Cumulative exergy demand is used identify minimize losses in optimized system. Division are overcome drawback low convergence speed encountered by well-known method genetic algo...

In the real solar tower thermal power system, it is widely acknowledged that the thermodynamic irreversibility, such as convective and radiative loss on tower receiver, and thermal resistance in heat exchangers, is unavoidable. With above factors in mind, this paper presents an ideal model of the solar tower thermal power system to analyze the influence of various parameters on thermal and exer...

measure of scientometric performance – IITs Kharagpur, Delhi, Roorkee and Bombay rank ahead of IIT Madras. Figure 4 which is the scatter plot of exergy per faculty (X/F) score versus faculty (F) tells an entirely different story. The Institute of Chemical Technology, Mumbai is by far the best performer. In this scheme IIT Madras ranks thirteenth. Figure 5 which is a scatter plot of exergy per c...

In this paper, exergy of conditioned air, exergy efficiency, irreversibility, and entropy generation of common models of evaporative cooling have been investigated in five cities of Iran. Direct evaporative cooling (DEC), indirect evaporative cooling (IEC), and two-stage IEC/DEC as the most popular methods of cooling have been modeled. Atmospheric conditions are considered as the dead state of ...

This paper presents exergy and exergoeconomic analysis and parametric study of a Diesel engine based Combined Heat and Power (CHP) system that produces 277 kW of electricity and 282 kW of heat. For this purpose, the CHP system is first thermodynamically analyzed through energy and exergy. Then cost balances and auxiliary equations are applied to subsystems. The exergoeconomic analysis is based ...

Due to the necessity of using highly efficient power generation systems to reduce fuel consumption and air pollution, the integration of different energy systems is promising modification to achieve higher efficiency. In this paper, the integration of an Internal Reforming Solid Oxide Fuel Cell (IRSOFC)-Gas Turbine (GT)-Organic Rankine Cycle (ORC) system has been proposed. In this regard, therm...