The continuous variable speed technology is a key in the development of pumped storage units. When operating range rotation widened, unit's stable and safe operation will be constrained by conditions, such as cavitation, hump, power limit. This paper uses traditional fixed-speed station research object. Based on complete characteristic curves unit, modification hypothesis after application carr...

Hydro generator design is a significant issue in terms of safety, efficiency, and energy production sustainability. One the most crucial issues about criteria to satisfy needs project?s critical speed. In this work, speed calculation an 11 MW hydro power plant was investigated with several steps. Numerical solution methodologies were implemented using ARMD?. A developed, implementation rotor ca...

The increasing development of storage systems connected to electrical networks is stimulated by network management issues related recent energetic landscape evolutions such as the integration renewable production sources. Hydro-pneumatic seem offer a clean and cheap energy solution among set existing techniques. present study analyses an air–water direct contact accumulation system, in closed c...

Hydro-joining is composed of hydro-piercing, hole flanging and nut-inlaying processes. In this study, a new hydro-flanging process combining hydro-piercing proposed. An internal pressured fluid used as the supporting medium instead rigid die. Three kinds punch head shapes are designed to explore thickness distribution flanged tube leakage effects between in process. A finite element code DEFORM...

Among all available solar technologies, solar-assisted heat pump (SAHP) is the most popular technology for low- and medium-temperature applications, i.e., drying, space heating, water heating. This paper presents a critical review of SAHP, leading to identification key technological challenges with current SAHP technology, including (1) poor energy performance at low ambient temperatures; (2) d...

We consider a power generation system comprising thermal units and pumped hydro storage plants, and introduce a model for its weekly cost-optimal operation. Due to the uncertainty of the load, the mathematical model represents a dynamic (multi-stage) stochastic program. The model involves a large number of mixed-integer (stochastic) decisions but its constraints are loosely coupled across opera...

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 ...