Renewables and Efficiency

Britain and Germany saw unprecedented growth of variable renewable energy (VRE) in the last decade. Many studies suggest this will significantly raise short term power system operation costs for balancing and congestion management. We review the actual development of these costs. their allocation and policy implications in both countries. Since …

This paper presents an enhanced control strategy for Wind Energy Conversion System (WECS) using Doubly-Fed Induction Generator (DFIG). A robust Super-Twisting (STW) sliding mode control for variable speed wind turbine is developed to produce the optimal aerodynamic torque and improve the dynamic performance of the WECS. The electromagnetic torque of …

This paper studies the multidisciplinary nature of two body wave energy converters by a parametric study based on the Taguchi method which helps to understand the effect of different dependent parameters on the wave energy conversion performance. Seven different parameters are analyzed and their effect on the maximum captured power. …

In this research work an introduction to the concept of an actively controlled horizontal axis wind turbine through varying blade tip sweep. is presented. The concept refers to variable tip swept rotor blades. that have the ability to pivot collectively aft. about an axis located at the blade tips. Quantities …

Wind conditions in the built environment are complex in nature and characterized by lower wind speeds and higher turbulence due to the presence of obstructions. A growing body of literature and research testing activities related to performance evaluation of small wind turbines (SWTs) in urban wind conditions have inferred that …

This project expected to have the capacity to produce up to 200 gigawatts by 2030.

While not fully predictive. the model is considered to be accurate enough for design purposes. With the model at hand. the suitability of various combinations of greenhouse plastic and honeycomb designs can be assessed. It should be noted that the model predicts a heat transfer coefficient of 4.25 W m …

As demonstrated here. microalgal biodiesel is technically feasible. It is the only renewable biodiesel that can potentially completely displace liquid fuels derived from petroleum. Economics of producing microalgal biodiesel need to improve substantially to make it competitive with petrodiesel. but the level of improvement necessary appears to be attainable. Producing …

Analysis and Design of Energy Geostructures gathers for the first time theoretical. experimental and design knowledge available to date about energy geostructures: an innovative technology that couples for any type of built environment the structural support role of the geostructures with the heating-cooling role of the geothermal heat exchangers harvesting …

The following conclusions can be drawn from the present study: The increase in alcohol content in diesel or biodiesel fuels always led to an increase in both IDCF and IDM. Such an increase was sharper at high alcohol contents. This implies that weight or volume averaging of autoignition parameters (such …