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Article

Techno-Economic Optimization of Diffuser Configuration Effect on Centrifugal Compressor Performance

1Researcher in Cranfield University, Bedford, UK

2Head of Propulsion Engineering Centre, Cranfield University, Bedford, UK


American Journal of Energy Research. 2015, 3(2), 37-48
doi: 10.12691/ajer-3-2-4
Copyright © 2016 Science and Education Publishing

Cite this paper:
Waleed Al-Busaidi, Pericles Pilidis. Techno-Economic Optimization of Diffuser Configuration Effect on Centrifugal Compressor Performance. American Journal of Energy Research. 2015; 3(2):37-48. doi: 10.12691/ajer-3-2-4.

Correspondence to: Waleed  Al-Busaidi, Researcher in Cranfield University, Bedford, UK. Email: w.albusaidi@cranfield.ac.uk

Abstract

Extensive research has been conducted on centrifugal compressors to investigate the influence of diffuser features on the stage performance. However, there are several geometrical parameters affecting the diffuser performance and the unsteady interaction with the rotating impeller which makes the appropriate selection of the optimum features more complex. Furthermore, the trade-off between the efficiency improvement and operating range extension necessitates the need for an optimization tool to decide the typical diffuser configuration. Hence, this paper aims to introduce a multi-decision optimization approach to define the overall diffuser characteristics based on the specified duty requirements. This approach uses the most recent developed models in this field to evaluate the impact of different diffuser types on the overall stage performance technically and economically. From the performance perspective, the influences of diffuser geometry have been utilized to study the impact on stage efficiency and stable flow range. Furthermore, this has been also discussed economically as a function of the diffuser losses cost in order to make the typical decision.

Keywords

References

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Article

Exergoeconomic and Sustainability Analysis of Reheat Gas Turbine Engine

1Power and Propulsion Department, School of Aerospace, Transport and Manufacturing Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK

2Mechanical Engineering Department, College of Engineering and Petroleum, Kuwait University, Al Asimah, P.O. Box 5969 Safat 13060, Khalidiya 72301, Kuwait


American Journal of Energy Research. 2016, 4(1), 1-10
doi: 10.12691/ajer-4-1-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
Abdulrahman Almutairi, Pericles Pilidis, Nawaf Al-Mutawa. Exergoeconomic and Sustainability Analysis of Reheat Gas Turbine Engine. American Journal of Energy Research. 2016; 4(1):1-10. doi: 10.12691/ajer-4-1-1.

Correspondence to: Abdulrahman  Almutairi, Power and Propulsion Department, School of Aerospace, Transport and Manufacturing Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK. Email: a.s.almutairi@cranfield.ac.uk

Abstract

Exergoeconomic and sustainability analyses have been performed for a heavy duty industrial reheat gas turbine engine. The proposed system was inspired by a GT26, Alstom advance-class gas turbine with a unique design modification based on the reheat principle using two sequential combustion chambers. The IPSEpro software package was used for validating the process and results tested against the manufacturer’s published data. Energy system performance is usually evaluated through energetic or exergetic criteria. The latter has the advantage of determining energy degradation and quantifying the deficiencies within a system as well as recognizing loss sources and types. The cost-effectiveness of using this gas turbine engine has been evaluated using exergoeconomic approach: the Specific Exergy Costing [SPECO] method. The sustainability of the proposed model was estimated using a generic combustor model, HEPHAESTUS, to appraise the emissions impact. The performance of gas turbine engines has been investigated for different load demand and climatic conditions using two configurations. The first system, Case-I, was a simple gas turbine (SCGT) engine, and the second, Case-II, a reheat gas turbine (RHGT) system. The reheat system boosted power output in RGHT, at the same time, reducing exergetic efficiency because of greater fuel consumption. Operating both systems at low ambient temperature is preferable and full load reduces waste exergy. The production cost on an exergy basis demonstrates that the RHGT has a lower value at 7.58 US$/GJ while the SCGT produces energy at 7.77 US$/GJ. From a sustainability perspective, the SCGT shows lower emission levels and has lower environmental impact than the RHGT.

Keywords

References

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Article

Optical Characterization of TiO2-bound (CuFeMnO4) Absorber Paint for Solar Thermal Applications

1Department of Physics, University of Nairobi, P.O. Box 00100-30197, Nairobi, Kenya

2Department of Physics, University of Botswana, Private Bag 0022, Gaborone, Botswana


American Journal of Energy Research. 2016, 4(1), 11-15
doi: 10.12691/ajer-4-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
C. O. Ayieko, R. J. Musembi, A. A. Ogacho, B. O. Aduda, B. M. Muthoka, P. K. Jain. Optical Characterization of TiO2-bound (CuFeMnO4) Absorber Paint for Solar Thermal Applications. American Journal of Energy Research. 2016; 4(1):11-15. doi: 10.12691/ajer-4-1-2.

Correspondence to: C.  O. Ayieko, Department of Physics, University of Nairobi, P.O. Box 00100-30197, Nairobi, Kenya. Email: opiyoc2006@yahoo.com

Abstract

A composite thin film consisting of TiO2 (binder), uniformly mixed CuFeMnO4 paint (solar absorber) was coated on textured aluminum sheets by dip coating. The film’s elemental analysis was done using energy dispersive x-ray (EDX) and the surface of the film characterized using scanning electron microscope (SEM). Optical properties of the TiO2/CuFeMnO4 composite film were also studied using computerized double beam solid-spec 3700 DUV Shimadzu Spectrophotometer. Reflectance was obtained by spectrophotometric measurements, and thermal emmittance was determined using heat flux- based technique respectively. Reflectance measurement values less than 0.03 in the solar wavelength (290 nm < λ < 2500 nm) and low thermal emmittance less than 0.016 for temperatures between 24°C and 100°C were obtained.

Keywords

References

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