Purpose. Justification of the rational parameters heat pumps and accumulators to ensure efficient operation hydro storage power plant (HSPP) in heating mode. Development an automated methodology for calculating a complex system operating Methodology. Mathematical analysis modeling. Findings. Using developed calculation method, it was analyzed determined that passing through pump full flow water...

Demand for space cooling in Canada has significantly increased in the past 20 years, and in conjunction with space heating loads in the winter are placing larger peak loads on the electrical grid. As a result, utilities must increase their generating and transmission capacity to meet the peak annual demand, with much of the capacity going unused for large portions of the year. Additionally, bas...

This paper presents a novel dosing concept for drug delivery based on a peristaltic piezo-electrically actuated micro membrane pump. The design of the silicon micropump itself is straight-forward, using two piezoelectrically actuated membrane valves as inlet and outlet, and a pump chamber with a piezoelectrically actuated pump membrane in-between. To achieve a precise dosing, this micropump is ...

This paper investigates how to increase the efficiency of a photovoltaic/energy storage generation unit supplying dynamic loads by regulating and managing both the photovoltaic generator and the storage battery charge-discharge modes. The proposed photovoltaic/energy storage unit is proposed to supply an induction motor driven industrial pump with controlled speed and/or a DC motor driven water...

Energy security is one of the main factors in development and diffusion microgrid applications. In networks operating without storage, operation their systems greatly affected by sudden load demand intermittent generation fluctuations. The purposes using energy storage microgrids are stabilizing renewable sources locally, to ensure that production matches demands, participating frequency regula...

The present paper proposes the implementation of a new algorithm for control speed regulators Pelton wheel turbines, used in many pumped hydroelectric energy storage systems that operate isolated electrical with high renewable participation. This differs substantially from standard developments which use PID or PI governors that, addition to acting on nozzle needles and deflectors, it incorpora...

The urgent energy transition needs a better penetration of renewable in the world’s mix. intermittency renewables requires use longer-term storage. present system uses water displacement, lined rock cavern or an aerial pressurised vessel, as virtual piston compressor and expander functions carbon dioxide heat pump cycle (HPC) organic transcritical (OTC). Within impermeable membrane, is compress...

the duration of icu (intensive care unit) stay in cardiac surgery patients has an important role in the rate of complications and costs. the aim of this study was to determine the role of perioperative risk factors in clinical outcome based on the time of icu discharge. in this descriptive study, 219 patients undergoing off-pump coronary artery bypass (opcab) surgery in afshar hospital in yazd,...