Determination of Rotor Surfacing Time for the Vertical Microturbine with Axial Gas-Dynamic Bearings

Energy Efficiency of the Heat and Power Complex for Highly Efficient Use of the Secondary and Renewable Energy Resources

“…Thermodynamic and hydraulic calculations of the cascade of the cascade heat pump system were carried out to determine the energy efficiency of the multifunctional heat point, after which the energy balance of the heat supply system-power supply object was compiled, on the basis of which the energy efficiency was obtained [13][14][15][16][17]. For example in the Fig.…”

Development of the simulation model of the interaction of automatic controllers in the control system of the energy complex

“…The papers [3][4][5] describe the operation of control systems of various power plants. However, the problem of inconvenient adjustment of parameters, as well as problems of a complex, hardly adaptable control system are revealed in these works.…”

“…There are no solutions in the works reviewed that can effectively implement the process of regulating the micro-energy complex operating on the Renken cycle, which should probably be based on the P and PI controllers of their own control system. The technical solutions considered in [3][4][5] are unable to solve the problem of parameter stabilization under any perturbations, despite the mutual influence of deviations of parameters.…”

Experimental evaluation of the dynamic properties of an energy microturbine with defects in the rotating system

“…As for vapour microturbines, their rotors are powered by the vapour of the working medium, which circulates in a closed cycle and is heated using an external heat source [12]. In such a system, the following types of heat sources can be applied: gas or biomass boiler, geothermal source, solar collectors and waste heat from various production processes [7,18]. The highest efficiency and profitability of installations with gas or vapour microturbines can be reached when the cogeneration is running (that is when there is a demand for both electric energy and thermal energy).…”

“…Shafts that rotate at high rotational speeds (which may exceed 100,000 rpm [13]) need to be supported by advanced and unconventional bearings such as magnetic [15], foil [28] and gas [19] bearings or even bearings lubricated with low-boiling mediums [14]. In addition to a good dynamic performance of the rotor over a wide rotational speed range, the bearing systems must be of great durability and reliability [7], allowing microturbines to operate without constant technical supervision. With the compact dimensions and low power output of microturbines, no strict procedures have to be followed every time they are set in motion as opposed to big power-station turbines [5].…”