Although solar energy is one of the most abundantly available and inexhaustible forms clean renewable energy, its use suffers from economic barriers mainly linked to intermittence. This article aims at comparing a conventional reference system (national grid gas boiler) four different combined heating power systems, namely photovoltaic panels with solar-assisted heat pump, national thermal pane...

The concept of optimization operating and design parameters the regenerative air turbine cogeneration (RATC) system is proposed. To determine energy efficiency indicators this system, its thermodynamic analysis was performed. At same time, it shown that not correct to search for optimal such a only by indicators, modern thermoeconomic methods should be more actively involved in pre-design pract...

The water scarcity in the world near future become to a global challenge. main aim of present study was elucidate performance three identical solar distillation units with different configurations under climatic conditions city Tehran. All systems were equipped heating source that are thermoelectric modules (TEH), copper heater (CH), and (SWH) while all system assisted an active external conden...

The optimization of the steam parameters heat recovery generators (HRSG) Combined Cycle Gas Turbines (CCGT) has become one important means to reduce power generation cost combined cycle units. Based on structural theory thermoeconomics, a thermoeconomic model for triple pressure reheat HRSG is established. Taking minimization system as objective, an algorithm based three factors and six levels ...

In order to investigate options for improving the maintenance protocol of commercial refrigeration plants, two thermoeconomic diagnosis methods were evaluated on a state-of-the-art refrigeration plant. A common relative indicator was proposed for the two methods in order to directly compare the quality of malfunction identification. Both methods were applicable to locate and categorise the malf...

Name: S u s a n W. S t e w a r t Brief Description: The HCFC refrigerant, R-22, is the most widely used residential air-conditioner refrigerant in the U.S. However, it is scheduled to be banned in new equipment beginning in 2010 due to its high ozone depletion potential (ODP). A new refrigerant, R-410A has zero ODP and favorable performance characteristics such as good cycle efficiency, non-fla...

The so-called Novikov power plant model has been widely used to represent some actual power plants, such as nuclear electric power generators. In the present work, a thermo-economic study of a Novikov power plant model is presented under three different regimes of performance: maximum power (MP), maximum ecological function (ME) and maximum efficient power (EP). In this study, different heat tr...

The necessity of air-conditioning causes the enormous energy use of underground train stations. Exergy and thermoeconomic analysis is applied to the annual operation of the air-conditioning system of a large underground train station in Taiwan. The current installation and the monitored data are taken to be the base case, which is then compared to three different optimized designs. The total re...