This paper proposes a new type of solar energy based power generation system using supercritical carbon dioxide and heat storage. The power generation cycle uses supercritical carbon dioxide as the working fluid and integrates the supercritical carbon dioxide cycle with an efficient high-temperature heat storage. The analysis shows that the new power generation system has significantly higher s...

This paper describes energy efficiency indicators and indices of improvements according to type use. The purpose is the monitoring comparing trends in EU-27 countries, Norway Republic Croatia, therefore Croatia have been specially presented for each consumption sectors.

Experience has shown that significant opportunity for performance improvements exists in energy intensive operations. Often, efforts to improve efficiency focus on vendor-led initiatives to improve operations of particular equipment. This approach assumes the overall efficiency of the system is simply a function of the individual units. However, many more factors contribute to overall performan...

Research is being conducted worldwide to develop new technologies for the generation of liquid fuels from renewable resources. In this context, it was stated recently that “biomass is the only practical source of renewable liquid fuel”. This is of utmost importance for sustainable development. Currently, biodiesel is produced by transesterification of vegetable oils and ethanol by fermentation ...

Device specific power consumption information leads to a high potential for energy savings. Smart meters are currently deployed in several countries, but they are only able to track the overall consumption in domestic and commercial buildings. One promising option to gain device specific information is called Nonintrusive Load Monitoring (NILM), which can be of great use in combination with sma...

Data envelopment analysis (DEA) is a non-parametric technique for evaluation of relative efficiency of decision making units described by multiple inputs and outputs. It is based on solving linear programming problems. Since 1978 when basic DEA model was introduced many its modifications were formulated. Among them are two or multi-stage models with serial or parallel structure often called net...

Data envelopment analysis (DEA) measures the relative efficiency of decision making units (DMUs) with multiple inputs and multiple outputs. DEA-based Malmquist productivity index measures the productivity change over time. We propose a dynamic DEA model involving network structure in each period within the framework a DEA. We have previously published the network DEA (NDEA) and the dynamic DEA ...

Abstract This article aims to carry out a comparative analysis in the European Union and Romania, period 1991-2021, on achievement of ambitious energy efficiency objectives, by assessing assumed targets for primary final consumption at level years 2020 2030. Since 2007, EU leaders have been concerned about decarbonisation sector, first essential measure being reduce 20% 2020. As part objectives...

As we enter the post-pandemic period, United Nations' first priority related to sustainable development is facilitate a green transition, whereby “investments must accelerate decarbonization of all aspects our economy.” A 2009 study conducted by The Rocky Mountain Institute stated that “The role energy efficiency has historically played in US generally under appreciated. If productivity had rem...