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- Author:
- Sharma, Shweta; Sheth, Pratik N.
- Source:
- Energy conversion and management 2016 v.110 pp. 307-318
- ISSN:
- 0196-8904
- Subject:
- air; biomass; energy balance; gasification; hydrogen; models; oxidation; steam; temperature; water content
- Abstract:
- ... Biomass is one of the most widely available energy sources and gasification is as an efficient process of converting biomass into combustible gases by partial oxidation at high temperature. In order to increase the hydrogen content of the producer gas, steam is used along with air in a gasifier. In the present study, extensive experimental work is carried out in a downdraft gasifier using air and ...
- DOI:
- 10.1016/j.enconman.2015.12.030
-
http://dx.doi.org/10.1016/j.enconman.2015.12.030
- Author:
- Yang, Mingyang; Deng, Kangyao; Martines-Botas, Ricardo; Zhuge, Weilin
- Source:
- Energy conversion and management 2016 v.110 pp. 51-58
- ISSN:
- 0196-8904
- Subject:
- compressors; energy conservation; mass flow; models; spark ignition engines
- Abstract:
- ... The turbocharger is the key enabler for energy conservation in Internal Combustion Engine (ICE). A turbine of a turbocharger is fed by highly pulsating flow due to the reciprocating engine, resulting in different behavior from that at steady conditions. This paper investigates the behavior of a mix-flow turbine under pulsating conditions via an analytical model and an in-house developed 1-D unstea ...
- DOI:
- 10.1016/j.enconman.2015.12.007
-
http://dx.doi.org/10.1016/j.enconman.2015.12.007
- Author:
- Kim, Min-Hwan; Kim, Hisuk; Kim, Dong Rip; Lee, Kwan-Soo
- Source:
- Energy conversion and management 2016 v.110 pp. 494-500
- ISSN:
- 0196-8904
- Subject:
- drainage; energy efficiency; fins; heat exchangers; heat pumps; heat transfer; models; surface tension
- Abstract:
- ... The retention water on fin surface can significantly degrade the thermal performance of heat exchangers under periodic frosting/defrosting conditions, which also leads to a decrease in the energy efficiency of air-source heat pumps. A novel louvered fin design was suggested to improve the drainage and the thermal performance of heat exchanger. The novel louvered fin had an asymmetric louver arrang ...
- DOI:
- 10.1016/j.enconman.2015.11.028
-
http://dx.doi.org/10.1016/j.enconman.2015.11.028
- Author:
- Wang, Yufang; Li, Zhengyu; Li, Qing
- Source:
- Energy conversion and management 2016 v.110 pp. 135-141
- ISSN:
- 0196-8904
- Subject:
- acoustics; cylinders; electric power; heat; methodology
- Abstract:
- ... A thermoacoustic electric generator without resonator designed for aerospace application is discussed in this study, which is developed by a traveling-wave looped-tube thermoacoustic heat engine coupling with two linear alternators directly. A novel method of filling phase modulation object in the acoustic power output port is proposed to improve the performance of the thermoacoustic electric gene ...
- DOI:
- 10.1016/j.enconman.2015.11.065
-
http://dx.doi.org/10.1016/j.enconman.2015.11.065
- Author:
- Kundu, Balaram; Lee, Kwan-Soo
- Source:
- Energy conversion and management 2016 v.110 pp. 469-480
- ISSN:
- 0196-8904
- Subject:
- analytical methods; fins; heat transfer; manufacturing
- Abstract:
- ... The annular stepped fin is a common choice for enhancing heat transfer from a cylindrical primary surface. This typical fin shape is easy in manufacturing compared to the taper shape. There is still effort required to increase the heat transfer rate per unit mass of a step fin. With this design point of view, the present study has been carried out. There may be two design aspects to be adopted to ...
- DOI:
- 10.1016/j.enconman.2015.09.037
-
http://dx.doi.org/10.1016/j.enconman.2015.09.037
- Author:
- Andersson, Jim; Furusjö, Erik; Wetterlund, Elisabeth; Lundgren, Joakim; Landälv, Ingvar
- Source:
- Energy conversion and management 2016 v.110 pp. 240-248
- ISSN:
- 0196-8904
- Subject:
- biofuels; gasification; market prices; methanol; mixing; oils; production costs; pulp; pyrolysis; waste liquors; Sweden
- Abstract:
- ... The main aim of this study is to investigate integrated methanol production via co-gasification of black liquor (BL) and pyrolysis oil (PO), at Swedish pulp mills. The objectives are to evaluate techno-economically different blends ratios for different pulp mill capacities. Furthermore, the future methanol production potential in Sweden and overall system consequences of large-scale implementation ...
- DOI:
- 10.1016/j.enconman.2015.12.027
-
http://dx.doi.org/10.1016/j.enconman.2015.12.027
- Author:
- Meng, Xian-long; Xia, Xin-lin; Zhang, Shun-de; Sellami, Nazmi; Mallick, Tapas
- Source:
- Energy conversion and management 2016 v.110 pp. 327-337
- ISSN:
- 0196-8904
- Subject:
- aluminum oxide; heat transfer; mass flow; mathematical models; porosity; solar collectors; temperature
- Abstract:
- ... In this article, a newly designed volumetric solar receiver (VSR) using cup-shaped Al2O3 porous absorber is studied through numerical simulations and experimental verification. The absorber achieves several advantages including lower heat loss and higher uniformity of heat flux. The ray tracing method is adopted to obtain the external radiation source. The inner radiative exchange within the cavit ...
- DOI:
- 10.1016/j.enconman.2015.12.034
-
http://dx.doi.org/10.1016/j.enconman.2015.12.034
- Author:
- Ming, Zeng; Ping, Zhang; Shunkun, Yu; Ge, Zhang
- Source:
- Energy conversion and management 2016 v.110 pp. 59-66
- ISSN:
- 0196-8904
- Subject:
- decision making; economic evaluation; electricity; fuels; heat; market competition; markets; models; power generation; prices; risk; uncertainty; uncertainty analysis; China
- Abstract:
- ... The introduction of market competition and the increased uncertainty factors makes the generators have to decide not only on whether to invest generation capacity or not but also on what kind of generation technology to choose. In this paper, a decision-making model of generation technology investment is proposed. The irreversible investment concept and real option theory is introduced as the fund ...
- DOI:
- 10.1016/j.enconman.2015.12.005
-
http://dx.doi.org/10.1016/j.enconman.2015.12.005
- Author:
- Skomedal, Gunstein; Holmgren, Lennart; Middleton, Hugh; Eremin, I.S.; Isachenko, G.N.; Jaegle, Martin; Tarantik, Karina; Vlachos, Nikolas; Manoli, Maria; Kyratsi, Theodora; Berthebaud, David; Dao Truong, Nhi Y.; Gascoin, Franck
- Source:
- Energy conversion and management 2016 v.110 pp. 13-21
- ISSN:
- 0196-8904
- Subject:
- bismuth; cold; electric generators; lead; magnesium; manganese; models; temperature; thermal expansion; toxicity
- Abstract:
- ... Silicides have attracted considerable attention for use in thermoelectric generators due mainly to low cost, low toxicity and light weight, in contrast to conventional materials such as bismuth and lead telluride. Most reported work has focused on optimizing the materials properties while little has been done on module testing. In this work we have designed and tested modules based on N-type magne ...
- DOI:
- 10.1016/j.enconman.2015.11.068
-
http://dx.doi.org/10.1016/j.enconman.2015.11.068
- Author:
- Ali, Babkir; Kumar, Amit
- Source:
- Energy conversion and management 2016 v.110 pp. 386-396
- ISSN:
- 0196-8904
- Subject:
- cooling; cooling towers; natural gas; power generation; shale; steam; water footprint
- Abstract:
- ... The key objective of this paper is to develop a benchmark for water demand coefficients of the complete life cycle of natural gas-fired power generation. Water demand coefficients include water consumption and water withdrawals for various stages of natural gas production as well as for power generation from it. Pathways were structured based on the unit operations of the types of natural gas sour ...
- DOI:
- 10.1016/j.enconman.2015.12.048
-
http://dx.doi.org/10.1016/j.enconman.2015.12.048
- Author:
- Elzahaby, Aly M.; Kabeel, A.E.; Bassuoni, M.M.; Elbar, Ayman Refat Abd
- Source:
- Energy conversion and management 2016 v.110 pp. 397-406
- ISSN:
- 0196-8904
- Subject:
- desalination; direct contact; distillation; geometry; saline water; salt concentration; solar energy; water flow; water temperature
- Abstract:
- ... An experimental and theoretical investigation for salt water desalination using tubular direct contact membrane distillation is introduced. The effect of operating and geometric parameters on the unit performance was studied. These parameters include feed water inlet temperature, feed water flow rate, salt concentration, cooling water temperature and membrane inner diameter and length. System ther ...
- DOI:
- 10.1016/j.enconman.2015.12.046
-
http://dx.doi.org/10.1016/j.enconman.2015.12.046
- Author:
- Zhang, Di; Evangelisti, Sara; Lettieri, Paola; Papageorgiou, Lazaros G.
- Source:
- Energy conversion and management 2016 v.110 pp. 113-124
- ISSN:
- 0196-8904
- Subject:
- carbon; carbon dioxide; case studies; correlation; economic sustainability; electric energy consumption; electricity; energy; energy costs; energy resources; greenhouse gas emissions; linear programming; models; prices; tariffs; United Kingdom
- Abstract:
- ... Microgrids are promising in reducing energy consumption and carbon emissions, compared with the current centralised energy generation systems. Smart homes are becoming popular for their lower energy cost and provision of comfort. Flexible energy-consuming household tasks can be scheduled co-ordinately among multiple smart homes to reduce economic cost and CO2. However, the electricity tariff is no ...
- DOI:
- 10.1016/j.enconman.2015.11.056
-
http://dx.doi.org/10.1016/j.enconman.2015.11.056
- Author:
- Mahmoudi, A.H.; Ramiar, A.; Esmaili, Q.
- Source:
- Energy conversion and management 2016 v.110 pp. 78-89
- ISSN:
- 0196-8904
- Subject:
- catalysts; cathodes; deformation; fuel cells; models; water management
- Abstract:
- ... In this paper, effects of inhomogeneous compression of GDL at the cathode side of proton-exchange membrane (PEM) fuel cell with interdigitated flow field on water management and cell performance has been numerically investigated.A 2D, isothermal, two-phase and multi-component transport model has been used in order to simulate the transport phenomena. The model consists the gas diffusion layer and ...
- DOI:
- 10.1016/j.enconman.2015.12.012
-
http://dx.doi.org/10.1016/j.enconman.2015.12.012
- Author:
- Ganesapillai, M.; Manara, P.; Zabaniotou, A.
- Source:
- Energy conversion and management 2016 v.110 pp. 287-295
- ISSN:
- 0196-8904
- Subject:
- alternative fuels; biomass; energy-dispersive X-ray analysis; glycerol; lignocellulose; pyrolysis; renewable energy sources; scanning electron microscopy; seeds; synthesis gas; waste management
- Abstract:
- ... Pyrolysis is considered to be a sustainable energy technology and is practiced widely in waste management. In this study, three issues were explored: (a) the implication of crude glycerol addition to lignocellulosic biomass in pyrolysis, (b) the effect of microwave pretreatment on the pyrolysis product yields and (c) study of pyrolysis parameters and assessment of products quality. Characterizatio ...
- DOI:
- 10.1016/j.enconman.2015.12.045
-
http://dx.doi.org/10.1016/j.enconman.2015.12.045
- Author:
- Luo, Baojun
- Source:
- Energy conversion and management 2016 v.110 pp. 192-199
- ISSN:
- 0196-8904
- Subject:
- air conditioning; evaporation; oils; solubility; temperature; vapors
- Abstract:
- ... Oil flooded compression with regenerator (OFCR) is one of the possible technologies to improve the performance of air conditioner. The addition of OFCR system to basic vapor compression system adds several components: oil separator, oil cooler and regenerator. These components can lead to a significant increase in performance. In this study, parametric studies of these components performance have ...
- DOI:
- 10.1016/j.enconman.2015.12.024
-
http://dx.doi.org/10.1016/j.enconman.2015.12.024
- Author:
- d’Ambrosio, S.; Ferrari, A.
- Source:
- Energy conversion and management 2016 v.110 pp. 457-468
- ISSN:
- 0196-8904
- Subject:
- carbon monoxide; cylinders; diesel engines; emissions; energy use and consumption; gases; hydrocarbons; injectors; nitrogen oxides; soot; temperature
- Abstract:
- ... The potential of pilot injection has been assessed on a low-temperature combustion diesel engine for automotive applications, which was characterized by a reduced compression-ratio, high EGR rates and postponed main injection timings. Dwell time sweeps have been carried out for pilot injections with distinct energizing times under different representative steady-state working conditions of the med ...
- DOI:
- 10.1016/j.enconman.2015.12.014
-
http://dx.doi.org/10.1016/j.enconman.2015.12.014
- Author:
- Kundu, Balaram; Lee, Kwan-Soo
- Source:
- Energy conversion and management 2016 v.110 pp. 481-493
- ISSN:
- 0196-8904
- Subject:
- air; dewpoint; equations; fins; heat transfer; humidity; linear models; surface temperature; weight gain
- Abstract:
- ... A method based on the variational principle is used to determine a minimum shape of wet fins for effective transfer of heat in fins. In many air-cooling applications, fin surface becomes wet as the surface is lower than the dewpoint temperature of the surrounding air. On the wet surface, both the sensible and latent heat transfer take place due to an existence of respective driving forces. The fin ...
- DOI:
- 10.1016/j.enconman.2015.09.054
-
http://dx.doi.org/10.1016/j.enconman.2015.09.054
- Author:
- Azimoh, Chukwuma Leonard; Klintenberg, Patrik; Wallin, Fredrik; Karlsson, Björn; Mbohwa, Charles
- Source:
- Energy conversion and management 2016 v.110 pp. 268-277
- ISSN:
- 0196-8904
- Subject:
- cost effectiveness; developing countries; electricity; energy; households; income; natural resources; planning; production costs; rural development; rural electrification; socioeconomic development; viability; villages; South Africa
- Abstract:
- ... The objective of most rural electrification programs in the developing world is to bring about socio-economic development to households. Governments have put in place a number of measures to achieve this goal. Previous studies on rural electrification programs in developing countries show that solar home systems and mini-grid systems are the dominant technologies. Assessments of a pilot hybrid min ...
- DOI:
- 10.1016/j.enconman.2015.12.015
-
http://dx.doi.org/10.1016/j.enconman.2015.12.015
- Author:
- Quej, Victor H.; Almorox, Javier; Ibrakhimov, Mirzakhayot; Saito, Laurel
- Source:
- Energy conversion and management 2016 v.110 pp. 448-456
- ISSN:
- 0196-8904
- Subject:
- air; humidity; hydrology; meteorological data; models; rain; solar radiation; temperature; Mexico
- Abstract:
- ... This paper evaluates the accuracy and applicability of thirteen empirical global solar radiation models for warm subhumid regions that use daily meteorological data at six stations in Mexico (Yucatán Peninsula). One of the models investigated is a new empirical model developed for estimation of daily global solar radiation from a horizontal surface. The models were evaluated using root mean square ...
- DOI:
- 10.1016/j.enconman.2015.12.050
-
http://dx.doi.org/10.1016/j.enconman.2015.12.050
- Author:
- Rawat, Rahul; Kaushik, S.C.; Sastry, O.S.; Singh, Y.K.; Bora, B.
- Source:
- Energy conversion and management 2016 v.110 pp. 42-50
- ISSN:
- 0196-8904
- Subject:
- climate; electrical properties; electricity; energy conservation; exergy; markets; solar collectors; time series analysis
- Abstract:
- ... The solar photovoltaic (PV) technology market has increased rapidly with the continuously increasing electricity demand and climate concerns. With the increased PV installed capacity, the performance analysis of these systems has become critically important in order to ensure its reliable operation for a long lifetime, monetary payback and to identify the scope of improvement. The well-established ...
- DOI:
- 10.1016/j.enconman.2015.11.069
-
http://dx.doi.org/10.1016/j.enconman.2015.11.069