Renewables and Efficiency

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 …

Novel underground well pattern systems. replacing fracturing reservoir with horizontal wells. were proposed for geothermal energy exploitation in this paper. The most important feature of the well pattern systems was the wholly closed circulation inside the wellbores. Compared to the fractured reservoir system where the fluid flowed in the porous …

The energy problems experienced in Sub-Saharan Africa today can only be solved by the decentralization of energy generation to the smallest subset possible. To achieve that. renewable energy must be considered and utilized. This supports the generation of clean energy and would contribute enormously to the “unofficial economy“ that is …

Wind energy is re-shaping the global energy mix.

Life cycle assessment of an innovative multi-use offshore platform design. which unites wind and wave energy production in one platform. was executed in this study. By all means. the main contributor to all of the impact categories was manufacturing processes of MUP design. Due to having a design which requires …

In this paper a variable structure control based on a sliding mode control (SMC) of a doubly fed induction generator (DFIG) grid-connected wind energy conversion system. incorporating a maximum power point tracker (MPPT) for dynamic power control has been presented. This structure has been used for reference tracking of active …

In this paper a variable structure control based on a sliding mode control (SMC) of a doubly fed induction generator (DFIG) grid-connected wind energy conversion system. incorporating a maximum power point tracker (MPPT) for dynamic power control has been presented. This structure has been used for reference tracking of active …

Biodiesel is a promising non-toxic and biodegradable alternative fuel used in the transport sector. Nevertheless. the higher viscosity and density of biodiesel poses some acute problems when it is used it in unmodified engine. Taking this into consideration. this study has been focused towards two objectives. The first objective is …