Energy Conversion and Management

article

Feasibility study of a new two-stage low temperature desalination process

Veera Gnaneswar Gude, Nagamany Nirmalakhandan, Shuguang Deng, Anand Maganti

Energy Conversion and Management > 2012 > 56 > Complete > 192-198

This paper presents the preliminary field test data of a two-stage low temperature phase-change desalination process. The process under development operates at low temperatures and low pressures generated by local barometric head. A two-stage configuration of this process was developed and tested at a field site in the Puget Sound bay area of the State of Washington. The field test results proved...

article

Optimization of PI parameters for DSP-based permanent magnet brushless motor drive using response surface methodology

Metin Demirtas, Aslan Deniz Karaoglan

Energy Conversion and Management > 2012 > 56 > Complete > 104-111

This paper proposes response surface methodology (RSM) for tuning Proportional Integral (PI) coefficients for a Permanent Magnet Brushless Direct Current (PMBLDC) motor drive. Overshoot and settling time data are obtained from the application circuit for different K _p –K _i pairs. RSM is a union of statistical and mathematical techniques necessary for developing, improving, and optimizing...

article

An experimental investigation of liquid metal thermal joint

Yueguang Deng, Jing Liu

Energy Conversion and Management > 2012 > 56 > Complete > 152-156

This paper presents a highly flexible thermal joint based on room-temperature liquid metal. With the liquid metal joint, a flexible heat conduction device could be fabricated and operate efficiently under bending, torsion or vibration conditions. Conceptual experiments demonstrated that the tolerable bending and torsion angle could be as large as 120°, and the heat transfer capability would not decrease...

article

A research on exergy consumption and potential of total CO2 emission in the Turkish cement sector

M. Ziya SÖĞÜT

Energy Conversion and Management > 2012 > 56 > Complete > 37-45

In this study, exergetic efficiency of Turkish cement production and CO ₂ emissions caused by the sector due to exergetic losses and environmental effects are examined, considering the clinker production between 1999 and 2007. As a first step, exergy analyses based on dead state temperature and production data of clinker are carried out according to the second law of thermodynamics. Consequently,...

article

Evaluation of some thin-layer drying models of persimmon slices (Diospyros kaki L.)

İbrahim Doymaz

Energy Conversion and Management > 2012 > 56 > Complete > 199-205

The effect of blanching and drying temperature (50, 60 and 70°C) on drying kinetics and rehydration ratio of persimmons under hot-air drying was investigated. It was observed that both the drying temperature and blanching affected the drying time. The shortest drying times and highest rehydration ratios were obtained from blanched samples. Six thin-layer drying models were evaluated in the kinetics...

article

Ultimate refrigerating conditions, behavior turning and a thermodynamic analysis for absorption–compression hybrid refrigeration cycle

Danxing Zheng, Xuelin Meng

Energy Conversion and Management > 2012 > 56 > Complete > 166-174

The absorption–compression hybrid refrigeration cycle has been considered as an effective approach to reduce the mechanical work consumption by using low-grade heat, such as solar energy. This work aims at studying the thermodynamic mechanism of the hybrid refrigeration cycle. Two fundamental concepts have been proposed, which are the ultimate refrigerating temperature (or the ultimate temperature...

article

Scheduling of a hydro producer considering head-dependency, price scenarios and risk-aversion

H.M.I. Pousinho, V.M.F. Mendes, J.P.S. Catalão

Energy Conversion and Management > 2012 > 56 > Complete > 96-103

In this paper, a mixed-integer quadratic programming approach is proposed for the short-term hydro scheduling problem, considering head-dependency, discontinuous operating regions and discharge ramping constraints. As new contributions to earlier studies, market uncertainty is introduced in the model via price scenarios, and risk aversion is also incorporated by limiting the volatility of the expected...

article

Editorial Board

Energy Conversion and Management > 2012 > 56 > Complete > IFC

article

Energy and cost analysis of small-size integrated coal gasification and syngas storage power plants

Giorgio Cau, Daniele Cocco, Fabio Serra

Energy Conversion and Management > 2012 > 56 > Complete > 121-129

This study evaluates the energy and economic performance of small and medium size coal gasification power plants integrated with a syngas storage section (ICGSS). In ICGSS systems, a portion of the produced syngas is stored during periods of low energy demand and used to increase power output during periods of peaking demand, so that they can perform a load-following service and can operate in the...

article

Experimental study of nanofluid effects on the thermal performance with response time of heat pipe

Ramin Hajian, Mohammad Layeghi, Kamal Abbaspour Sani

Energy Conversion and Management > 2012 > 56 > Complete > 63-68

Nanofluids, which are suspensions of nanoparticles in base fluids, have been introduced as new enhanced media for heat transfer, especially during the last decade. An experimental investigation has been carried out on nanofluid effects on the thermal performance of a medium-sized cylindrical meshed heat pipe, in both transient and steady states. Thermal resistance and response time of the heat pipe...

article

Annual analysis of heat pipe PV/T systems for domestic hot water and electricity production

Pei Gang, Fu Huide, Ji Jie, Chow Tin-tai, more

Energy Conversion and Management > 2012 > 56 > Complete > 8-21

Heat-pipe photovoltaic/thermal (HP-PV/T) systems can simultaneously provide electrical and thermal energy. Compared with traditional water-type photovoltaic/thermal systems, HP-PV/T systems can be used in cold regions without being frozen with the aid of a carefully selected heat-pipe working fluid. The current research presents a detailed simulation model of the HP-PV/T system. Using this model,...

article

Hydrogen production from burning and reforming of ammonia in a microreforming system

J.H. Kim, D.H. Um, O.C. Kwon

Energy Conversion and Management > 2012 > 56 > Complete > 184-191

Hydrogen (H ₂ ) is produced by burning and reforming ammonia (NH ₃ ) in a microreforming system. A micro-combustor that burns H ₂ -added NH ₃ –air mixtures as a heat source is a cylinder with an expanded exhaust outlet that facilitates ignition and an annular-type shield that adopts a heat-recirculation concept. A micro-reformer that converts NH ₃ to H ₂...

article

Optimal coordination of distance and over-current relays in series compensated systems based on MAPSO

Zahra Moravej, Mostafa Jazaeri, Mehdi Gholamzadeh

Energy Conversion and Management > 2012 > 56 > Complete > 140-151

In this paper, a novel problem formulation for optimal coordination between distance relays and Directional Over-Current Relays (DOCRs) in series compensated systems is proposed. The integration of the series capacitor (SC) into the transmission line makes the coordination problem more complex. The main contribution of this paper is a new systematic method for computing the optimal second zone timing...

article

Time-varying acceleration coefficients IPSO for solving dynamic economic dispatch with non-smooth cost function

Behnam Mohammadi-ivatloo, Abbas Rabiee, Mehdi Ehsan

Energy Conversion and Management > 2012 > 56 > Complete > 175-183

The objective of the dynamic economic dispatch (DED) problem is to schedule power generation for the online units for a given time horizon economically, satisfying various operational constraints. Due to the effect of valve-point effects and prohibited operating zones (POZs) in the generating units cost functions, DED problem is a highly non-linear and non-convex optimization problem. The DED problem...

article

An integrative approach to the design methodology for 3-phase power conditioners in Photovoltaic Grid-Connected systems

Alexis B. Rey-Boué, Rafael García-Valverde, Francisco de A. Ruz-Vila, José M. Torrelo-Ponce

Energy Conversion and Management > 2012 > 56 > Complete > 80-95

A novel methodology is presented in this paper, for the design of the Power and Control Subsystems of a 3-phase Photovoltaic Grid-Connected system in an easy and comprehensive way, as an integrative approach. At the DC side of the Power Subsystem, the Photovoltaic Generator modeling is revised and a simple model is proposed, whereas at the AC side, a vector analysis is done to deal with the instantaneous...

article

Gasification of various types of tertiary coals: A sustainability approach

Murat Öztürk, Nuri Özek, Yunus Emre Yüksel

Energy Conversion and Management > 2012 > 56 > Complete > 157-165

The utilization of coal to produce a syngas via gasification processes is becoming a sustainability option because of the availability and the economic relevance of this fossil source in the present world energy scenario. Reserves of coal are abundant and more geographically spread over the world than crude oil and natural gas. This paper focuses on sustainability of the process of coal gasification;...

article

A new catalyst system in transesterification of palm olein: Tolerance of water and free fatty acids

Peng-Lim Boey, Shangeetha Ganesan, Gaanty Pragas Maniam, Melati Khairuddean, more

Energy Conversion and Management > 2012 > 56 > Complete > 46-52

Boiler ash (BA) from oil palm empty fruit bunches used as pseudo-homogeneous base catalyst to transesterify palm olein at mild reaction conditions (3wt.% BA dried at 105°C, 2h; 15:1 methanol to oil molar ratio at methanol refluxing temperature in 0.5h) yielded 90% methyl esters. However, the catalyst showed low water (0wt.%) and FFA (1wt.%) tolerance. Laboratory calcium oxide (Lab CaO, calcined at...

article

A three-dimensional study on the formation and dissociation of methane hydrate in porous sediment by depressurization

Xin Yang, Chang-Yu Sun, Ke-Hua Su, Qing Yuan, more

Energy Conversion and Management > 2012 > 56 > Complete > 1-7

A middle-scale reactor equipped with 16 thermocouples was used to investigate the formation and dissociation of methane hydrate in sediment in three dimensions. A method was proposed to form hydrate homogeneously distributed in sediment, i.e., using frozen sand instead of wet sand with pore water. With the formed hydrate sample, hydrate dissociation experiment by depressurization was carried out at...

article

Optimizing combustion process by adaptive tuning technology based on Integrated Genetic Algorithm and Computational Fluid Dynamics

X. Liu, R.C. Bansal

Energy Conversion and Management > 2012 > 56 > Complete > 53-62

Low carbon economy and the current dominant role of fossil fuel power plants in serving electricity require the decrease of emission due to carbon dioxide by improving the boiler efficiency. Literature review and industry practice show that neural network based methods are applied to improve the boiler efficiency in a number of power plants. However, slagging and fouling are still serious problems...

article

Stationary super-capacitor energy storage system to save regenerative braking energy in a metro line

Reza Teymourfar, Behzad Asaei, Hossein Iman-Eini, Razieh Nejati fard

Energy Conversion and Management > 2012 > 56 > Complete > 206-214

In this paper, the stationary super-capacitors are used to store a metro network regenerative braking energy. In order to estimate the required energy storage systems (ESSs), line 3 of Tehran metro network is modeled through a novel approach, in peak and off-peak conditions based on the real data obtained from Tehran metro office. A useful method is proposed to predict the maximum instantaneous regenerative...

INFONA - science communication portal

Energy Conversion and Management

Feasibility study of a new two-stage low temperature desalination process

Optimization of PI parameters for DSP-based permanent magnet brushless motor drive using response surface methodology

An experimental investigation of liquid metal thermal joint

A research on exergy consumption and potential of total CO2 emission in the Turkish cement sector

Evaluation of some thin-layer drying models of persimmon slices (Diospyros kaki L.)

Ultimate refrigerating conditions, behavior turning and a thermodynamic analysis for absorption–compression hybrid refrigeration cycle

Scheduling of a hydro producer considering head-dependency, price scenarios and risk-aversion

Editorial Board

Energy and cost analysis of small-size integrated coal gasification and syngas storage power plants

Experimental study of nanofluid effects on the thermal performance with response time of heat pipe

Annual analysis of heat pipe PV/T systems for domestic hot water and electricity production

Hydrogen production from burning and reforming of ammonia in a microreforming system

Optimal coordination of distance and over-current relays in series compensated systems based on MAPSO

Time-varying acceleration coefficients IPSO for solving dynamic economic dispatch with non-smooth cost function

An integrative approach to the design methodology for 3-phase power conditioners in Photovoltaic Grid-Connected systems

Gasification of various types of tertiary coals: A sustainability approach

A new catalyst system in transesterification of palm olein: Tolerance of water and free fatty acids

A three-dimensional study on the formation and dissociation of methane hydrate in porous sediment by depressurization

Optimizing combustion process by adaptive tuning technology based on Integrated Genetic Algorithm and Computational Fluid Dynamics

Stationary super-capacitor energy storage system to save regenerative braking energy in a metro line

Filter options

Publication date

Number

Keywords

INFONA - science communication portal

Energy Conversion and Management

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Number

Keywords

Reporting an error / abuse

Sending the report failed

Accessibility options