The variable speed power generation brings higher efficiency and other economy benefits namely in low power range sources and isolated systems with local net supply. Typically it is in mobile power generation based on fuel engine drive, but the results are also useful in the area of wind power generation and maybe in few years in automobile industry for car board-net supply as well. To keep high efficiency, the cheap constant-geometry wind turbine must be operated at variable rotation speed in dependence on wind speed. Permanent magnet synchronous generator was first to used in VSCF generation, but its flux cannot be decreased at reduced load, therefore its excellent rated efficiency is not so optimal in competition with much cheaper and robust asynchronous generator (AG) at partial load. The mathematical model for AG optimal slip estimation from efficiency point of view is created. Some model results are presented to show the AG efficiency at varying load and its other advantages.
The plug-in hybrid vehicle based on the concept of battery operated vehicle with strong electrical motor(s) and electrochemical battery is for thermal comfort of crew and for occasional elongated travel range completed by generator, which is designed on average traction power only and during of journey is mainly used in co-generative run for cabin heating. Such vehicle efficiency can be improved by the third power source, specifically used only for acceleration and regenerative braking purposes. That role is optimal for super-capacitor, which has very good charging efficiency and can store the energy from braking to the next acceleration. Both these actions are usually very fast with high power in very short time. Its sizing and voltage control is investigated in this paper.
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Abstract. The paper goal is to give the short study of the possible energy saving by forced ventilation with integrated temperature recuperation in the living buildings, which must be permanently ventilated. The energy losses by ventilation with better constructions isolation grow relatively up. The basic thermal calculations explain the efficiency dependence on the outer temperature and the saved energy or power. The flow calculations give the principal dimensions of recuperators and the ventilators power consumption. The comparison of advertised savings of expensive products with typical temperatures in middle Europe is critical to the price of these devices produced in short series. The results from flow and thermal calculation can help not only in the recuperating unit choice in shopping, but also in DIY hobby realisation of simple counter flow recuperator for house. Only the mass production can reduce the price and bring wider use of this energy saving device.
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