A transcritical heat pump (THP) cycle using carbon dioxide (CO2) as the refrigerant is known to feature an excellent coefficient of performance (COP) as a thermodynamic system. Using this feature, we are designing and building a system that combines a water-to-water CO2 heat pump with both hot and cold thermal storages know as Thermal Battery (TB) (Blarke, 2012). Smart and effective use of inte...

Environmental concerns and depletion of nonrenewable resources has made great interest towards renewable energy resources. Cleanness and high potential are factors that caused fast growth of wind energy. However, the stochastic nature of wind energy makes the presence of energy storage systems (ESS) in wind integrated power systems, inevitable. Due to capability of being used in large-scale sys...

Abstract A radical transformation of the global energy system is underway. Solar photovoltaics and wind now comprise three-quarters net new electricity-generation-capacity additions because they are cheap. The deep renewable electrification services including transport, heating industry will allow solar to largely eliminate fossil fuels over next few decades. This paper demonstrates that Nepal ...

Wind sensors are widely used in many critical applications, such as navigation, weather forecast, aerospace and wind energy assessment. The thermal wind sensor can measure wind speed and direction at the same time, by measuring the temperature gradient on the sensor's surface which is induced by the wind flow. Compared to traditional mechanical wind sensors, there are two main advantages for th...

To integrate large shares of renewable energy sources in electric grids, large-scale and long-duration (4–8+ h) storage technologies must be used. A promising technology this kind is pumped thermal electricity based on Brayton cycles. The paper’s novel contribution the techno-economic comparison two alternative configurations such technology. Liquid-based solid-based were studied compared from ...

[1] Temperature and suspended particle distribution were surveyed and modeled in two high-Alpine reservoirs in Switzerland, connected by pumped-storage operations for 30 years. Due to different glacier coverage of the catchments, the two reservoirs exhibit different particle concentrations and temperatures. After ice-breakup, the lower reservoir with a higher glacier cover in its catchment expe...

The large-scale integration of renewable energy sources (RESs) has become one the most challenging topics in smart grids. Indeed, such an been causing significant grid stability issues (voltage and frequency control) due to dependency RESs on meteorological conditions. To this end, their must be accompanied by alternative attenuate power fluctuations. Energy storage systems (ESSs) can provide f...

The achievement of the long-term national energy targets in Greece for large-scale integration wind and solar may be facilitated by development hydro-pumped storage projects. In light above, technical aspects related with operation Greek power system its ability to absorb renewable are analyzed connection role relative economic aspects. aim this work is assess potential contribution projects es...