EPC’s enhancement mode gallium nitride (eGaN®) power transistors are a new generation of power switches offering unsurpassed performance over silicon power MOSFETs in switching speed and conduction losses with superior thermal characteristics. An accurate circuit and device model is a valuable tool for developing new topologies, building successful designs, and shortening time to market. This a...

This study is part 2 of the investigation on exergetic and exergoeconomic parameters an existing system with air-to-water heat pump unit as a source. Part 1 presents used experimental setup. The main aim conducted tests to develop models produced rate energetic COP at different ambient conditions. obtained data in where exergetinc assessment carried out. analysis was performed dynamically chang...

The Event-Driven Process Chain (EPC) and the Business Process Modeling Notation (BPMN) are designed for modelling business processes, but do not yet include any means for modelling process goals and their measures, and they do not have a published metamodel. We derive a metamodel for both languages, and extend the EPC and the BPMN with process goals and performance measures to make them concept...

In this paper, an exergoeconomic and exergetic sustainability analysis of a dual-pressure organic Rankine cycle (ORC) vapor compression refrigeration (VCRC) driven by waste heat is performed for power generation cooling production. addition, the most suitable fluid couple among thirty-five different pairs was investigated proposed combined system. The results indicate that highest energy utiliz...

Thermodynamic, exergetic and thermoeconomic analyses were performed on two types of double-effect LiBr–water absorption refrigeration systems (ARS) for use with a 5-kW high-temperature proton exchange membrane fuel cell (HT-PEMFC) as heat source. Proper temperatures the high-pressure generator, combined generator condenser, absorber evaporator determined to meet requirements constant cooling de...

Energetic and exergetic analyses as well as optimization studies of a transcritical carbon dioxide heat pump system are presented in this article. A computer code has been developed to obtain sub-critical and super-critical thermodynamic and transport properties of carbon dioxide. Estimates for irreversibilities of individual components of the system lead to possible measures for performance im...

Abstract This study is focused on the feasibility of using energy performance contracting (EPC) for retrofit two apartment buildings constructed precast concrete technologies in Slovakia decades ago. The packages were defined, and their suitability EPC was evaluated through discounted payback. uncertainties profitability calculations covered by designing five possible economic developments defi...

Heating, cooling and lighting appliances in buildings account for more than one third of the world’s primary energy demand. Therefore, main components of the building heating systems play an essential role in terms of energy consumption. In this context, efficient energy and exergy utilization in HVAC-R systems has been very essential, especially in developing energy policies towards increasing...

The aeroderivate gas turbines are widely used for power generation in the oil and gas industry. In offshore marine platforms, the aeroderivative gas turbines provide the energy required to drive mechanically compressors, pumps and electric generators. Therefore, the study of the performance of aeroderivate gas turbines based on a parametric analysis is relevant to carry out a diagnostic of the ...