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Buyadgie D.,Wilson | Buyadgie O.,Wilson | Buyadgie O.,Sustainable Refrigeration Technology Center | Drakhnia O.,Wilson | And 2 more authors.
International Journal of Low-Carbon Technologies | Year: 2015

The article describes the innovative solutions of power, heating and cooling generation utilizing low- or medium-grade heat sources. The proposed technology based on the well-known irreversible Brayton cycle and the revolutionary Maisotsenko cycle (M-cycle) operates at atmospheric or sub-atmospheric pressures. Such energetic systems are simple and reliable and utilize moisture-saturated air as a working fluid. The ejector replacing the mechanical compressor in the Brayton cycle system allows increasing the cycle work by three to five times at the constant airflow. At the same time, the utilized heat serves for simultaneous heating and cooling production that makes the system economically viable and environmentally friendly with the increased integral performance. For system's performance improvement, the schematic and the cycle were upgraded allowing the off-the-shelf components to be employed and replace the electrically driven fan with fluidic jet-fan that served for energy saving of the innovative turbo-ejector system operation. © The Author 2015. Source


Buyadgie D.,Wilson | Buyadgie D.,Sustainable Refrigeration Technology Center | Buyadgie O.,Wilson | Buyadgie O.,Sustainable Refrigeration Technology Center | And 6 more authors.
International Journal of Energy for a Clean Environment | Year: 2011

The Maisotsenko cycle (M-cycle) for air-conditioning technologies offers opportunities for energy conservation and reduction of greenhouse gas emissions. It also improves the quality of the cooled air without additional inputs for the return air system. The high efficiency of the M-cycle is observed at low relative humidity of the outside air, which restricts the M-cycle detached application. Obviously, an application of the M-cycle paired with conventional electrically-driven cooling systems will worsen energy characteristics due to the compressor work required. If the ejector refrigerating system (ERS) is combined with the Mcycle, the overall system performance increases as described in this paper. The combination of the M-cycle with ejector-based cooling systems explores application spheres of the M-cycle associated air conditioners. © 2011 by Begell House, Inc. Source


Buyadgie D.,Wilson | Buyadgie D.,Sustainable Refrigeration Technology Center | Buyadgie O.,Wilson | Buyadgie O.,Sustainable Refrigeration Technology Center | And 4 more authors.
International Journal of Low-Carbon Technologies | Year: 2012

Low energy efficiency and limitations of cooling temperatures in the ejector refrigeration systems (ERSs) are major obstacles for its widespread use. The application of binary or multicomponent fluids may prove to be one of the successful ways to increase the ERS performance by 30-50%. Zeotropic mixtures, which have unlimited solubility and evaporate at specified pressures and varying temperatures, are considered as possible candidates to be applied in a binary-fluid ERS (BERS). An ideal candidate working fluid should exhibit high molecular weight, low latent heat of evaporation, high normal boiling temperature and high compressibility factor. A refrigerant fluid should have low molecular weight, high latent heat of evaporation, low boiling point and compressibility factor. BERS pursues simultaneous achievement of two main goals: increase in system's efficiency and take the condensation point up to 45-50°C at fixed coefficient of performance, i.e. employ atmospheric condenser in ERS. This article presents schematic diagrams of a multicomponent-fluid ERS; its cascade principle based on BERS enables to produce cold at several temperature ramps, using renewable or low-grade heat sources. Research outcomes from this article can improve the effective application of ejector technology. © The Author 2012. Published by Oxford University Press. All rights reserved. Source


Buyadgie D.,Wilson | Buyadgie D.,Sustainable Refrigeration Technology Center | Buyadgie O.,Wilson | Buyadgie O.,Sustainable Refrigeration Technology Center | And 4 more authors.
Energy Procedia | Year: 2012

The continuous search for the effective cold generation methods resulted in the creation of thermally driven ejector refrigeration systems (ERS). Producing cold at various temperatures, the ERS serves to save electric energy and reduce greenhouse gas emissions. The theoretical analysis of the ejector cycles carried out for various ERS has proved its capability to generate the cold at +12°? to -40°?, reaching the COP values at 0.7 to 0.1 respectively. The combined cycles of water conversion, heat and cold production appear to be especially effective. © 2012 The Authors. Source

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