Energy Conversion and Management

article

Maximum obtainable specific cooling load of a refrigerator

Chih Wu

Energy Conversion and Management > 1995 > 36 > 1 > 7-10

The maximum obtainable specific cooling load of an endoreversible Carnot refrigerator is presented in this paper. The endoreversible Carnot refrigerator is a modified Carnot cycle. The only irreversibilities of the cycle are associated with the heat transfers between the refrigerator and the surrounding thermal reservoirs. The specific cooling load is the cooling load per unit of the total surface...

article

Thermal response of composite building envelopes accounting for thermal radiation

B. A. Price, T. F. Smith

Energy Conversion and Management > 1995 > 36 > 1 > 23-33

Thermal loads for an occupied zone depend on several different factors of which heat transfer through the walls of a zone is of interest in this study. Multiple modes of heat transfer, along with transient boundary conditions, create a transient heat transfer problem. The governing equation for heat transfer through the walls is the one-dimensional transient heat conduction equation with associated...

article

An improved process for H ₂ SO ₄ decomposition step of the sulfur-iodine cycle

I. T. Öztürk, A. Hammache, E. Bilgen

Energy Conversion and Management > 1995 > 36 > 1 > 11-21

This study presents a new design, and thermodynamic and engineering analyses of the H ₂ SO ₄ decomposition section (Section II of the GA sulfur-iodine process flow sheet) of the thermochemical hydrogen producing cycle. Thermodynamic (energy and exergy) and cost analyses have been carried out using thermodynamic data and costs in the literature. The results show that energetic and...

article

Biomass-fired steam power cogeneration system: a theoretical study

Surendra B. Prasad

Energy Conversion and Management > 1995 > 36 > 1 > 65-77

The theoretical performance of a biomass-fuelled boiler/steam power cogeneration system is investigated. The system performance is based on the known or assumed properties of the biomass fuel (its size, elemental composition, moisture content), energy content of the combustible constituents of the fuel, actual performance of a piston-operated-valve (POV) reciprocating engine and an alternator from...

article

Simulation and optimization of energy systems for in-bin drying of canola grain (rapeseed)

G. J. Schoenau, E. A. Arinze, S. Sokhansanj

Energy Conversion and Management > 1995 > 36 > 1 > 41-59

Energy utilization systems optimization and management strategies for in-bin drying of canola were investigated by using a validated computer simulation model and typical weather data for a prairie location in North America. The use of different energy systems, including natural gas, propane, electricity, solar energy, and combined natural gas and solar energy for drying grain within 15 days with...

article

Generation of a test reference year for Ibadan, Nigeria

R. Layi Fagbenle

Energy Conversion and Management > 1995 > 36 > 1 > 61-63

A test reference year for the city of Ibadan, Nigeria has been generated from a 10 yr global solar radiation data set using the Finkelstein-Schafer statistics. The representative year was identified for each month and the corresponding global solar radiation tabulated for ease of use in such applications as the performance analysis of solar systems.

article

Endoreversible thermoeconomics

Alexis De Vos

Energy Conversion and Management > 1995 > 36 > 1 > 1-5

An endoreversible power plant is optimized with respect to economical exploitation. This leads to an optimum performance, depending on the relative costs of investment and fuel.

article

Preoccupations for some thermopower equipment and installations rehabilitation and repowering

Mircea Cârdu

Energy Conversion and Management > 1995 > 36 > 1 > 35-40

The paper shows ICPET-SA activity results in the thermopower equipment and installations rehabilitation and repowering field: steam boilers, electrostatic precipitators, steam turbines, electrical generators and burning systems for industrial furnaces.

article

Solar radiation attenuation caused by atmospheric pollution

M. A. Hamdan, B. A. Kakish

Energy Conversion and Management > 1995 > 36 > 2 > 121-124

The attenuation of global solar radiation over the city of Amman, caused by atmospheric pollution, was investigated by comparing the measured solar radiation data during clear days with solar data obtained by a theoretical model that predicts the solar data under the same clear sky conditions. It was found that the model overpredicts the solar radiation data under such conditions, with the discrepancy...

article

New conceptual design method of non-equilibrium disk MHD generator

Yoshitaka Inui, Motoo Ishikawa, Juro Umoto

Energy Conversion and Management > 1995 > 36 > 2 > 109-119

It is important to develop a conceptual design method of a high performance non-equilibrium disk MHD generator. The objective of the conceptual design is to determine the basic specifications of the generator which satisfies many restrictions, in case some fixed conditions are given. The plasma in the designed generator should be stable and the isentropic efficiency should be as high as possible...

article

Aggregation/disaggregation method for optimal control of multizone HVAC systems

R. E. Rink, N. Li

Energy Conversion and Management > 1995 > 36 > 2 > 79-86

The problem of minimum-cost control of a multizone cooling system is considered, for the case where chilled-water storage capacity is substantial and electrical energy is offered at discounted price during off-peak hours of the day. The optimization problem is solved using state-increment dynamic programming, but limited to state spaces of low dimensionality through a sequential aggregation/disaggregation...

article

Liquefaction of hazelnut seed coat by supercritical gas extraction

M. M. Kucuk

Energy Conversion and Management > 1995 > 36 > 2 > 145-148

Supercritical fluid extracts of hazelnut seed coat were obtained using solvents (methanol, ethanol and acetone) and methanol and ethanol containing sodium hydroxide (10%) catalyst. The yields of supercritical methanol, ethanol and acetone extractions were 41.9, 52.3 and 60.9%, respectively, at 563 K. The yield of supercritical acetone extraction has been increased from 44.0 to 60.9% as the temperature...

article

Optimization of the thermodynamic model of aqua-ammonia absorption refrigeration systems

Ahmed T. Bulgan

Energy Conversion and Management > 1995 > 36 > 2 > 135-143

This work deals with optimization of the aqua-ammonia absorption refrigeration system (ARS) in the light of the first law of thermodynamics. The system consists of an evaporator, a generator, a condenser, a pump, expansion valves and two heat exchangers. A theoretical model is developed for the ARS. The coefficient of performance (COP) is maximized for various evaporator, condenser and absorber...

article

On the global approach of the National Power System development in Romania

Mircea Cârdu

Energy Conversion and Management > 1995 > 36 > 2 > 101-108

This paper deals with the policy laying at the foundation of the development of the National Power System (NPS) in Romania after the Second World War until now. The basic feature of the policy is the global approach over the topic of the NPS growth in Romania in point of finding the most favourable equilibrium related to the activities of designing, manufacturing, erection, repairing, etc. of the...

article

Some aspects of a PV/T collector/forced circulation flat plate solar water heater with solar cells

H. P. Garg, R. K. Agarwal

Energy Conversion and Management > 1995 > 36 > 2 > 87-99

Solar energy is mainly utilized via two routes--thermal and electrical. Two forms of energy are generated by two separate systems. The present work is about the study of a system which combines thermal and photovoltaic systems in one unit. The system is basically a conventional forced circulation type water heater. It is converted into a combined system by pasting solar cells directly over the...

article

Energy conservation with efficient electric drives

S. C. Tripathy

Energy Conversion and Management > 1995 > 36 > 2 > 125-134

This paper deals with the basic principle of energy efficient electric drive systems. The economic aspects, including calculation of life-cycle cost versus energy efficiency, have been highlighted. The paper also discusses the general applications of thyristor converter, inverter and chopper to the drive systems. It is expected that the paper will help engineers in industries to conserve energy...

article

Photovoltaic technology: basic concepts, sizing of a stand alone photovoltaic system for domestic applications and preliminary economic analysis

Vinod Kumar Sharma, Antonio Colangelo, Giuseppe Spagna

Energy Conversion and Management > 1995 > 36 > 3 > 161-174

Short descriptive outlines, both for the processes that occur in the photovoltaic effect and the simplest form of a stand alone photovoltaic system, are described in the present paper. System sizing, description of a few small to medium capacity PV installations, preliminary economic analysis, the information needs for diffusing this technology into rural areas with particular reference to developing...

article

Reliability and economic analysis of a power generation system including a photovoltaic system

Amit Jain, S. C. Tripathy, R. Balasubramanian

Energy Conversion and Management > 1995 > 36 > 3 > 183-189

A method for the reliability evaluation of an electric power generation system with a photovoltaic system is presented in this paper. An economic analysis of the system in terms of conventional fuel savings due to use of the photovoltaic system is also done. The fluctuating nature of the energy produced by the photovoltaic generation system has a different effect on the overall system reliability...

article

Experimental study of the performance of a solar collector cooled by heat pipes

M. Hammad

Energy Conversion and Management > 1995 > 36 > 3 > 197-203

This paper describes the performance of a flat plate solar collector cooled by a set of heat pipes, designed and manufactured locally to work at the low temperature conditions equal to that of flat plate solar collectors.Efficiencies and quantities of energy transferred to a water storage tank were calculated and found to be comparable to those obtained by using a water cooled solar collector.The...

article

Investigation of the thermal efficiencies of a solar dryer

Cigdem Tiris, Mustafa Tiris, Ibrahim Dincer

Energy Conversion and Management > 1995 > 36 > 3 > 205-212

This paper deals with the construction and performance of a solar powered drying system consisting of a solar air heater and a drying chamber. The thermal efficiencies of both the solar air heater and the drying section as a function of typical physical parameters and the experimental results for different food products at different air flow rates are discussed. The results of this study indicate...

INFONA - science communication portal

Energy Conversion and Management

Maximum obtainable specific cooling load of a refrigerator

Thermal response of composite building envelopes accounting for thermal radiation

An improved process for H ₂ SO ₄ decomposition step of the sulfur-iodine cycle

Biomass-fired steam power cogeneration system: a theoretical study

Simulation and optimization of energy systems for in-bin drying of canola grain (rapeseed)

Generation of a test reference year for Ibadan, Nigeria

Endoreversible thermoeconomics

Preoccupations for some thermopower equipment and installations rehabilitation and repowering

Solar radiation attenuation caused by atmospheric pollution

New conceptual design method of non-equilibrium disk MHD generator

Aggregation/disaggregation method for optimal control of multizone HVAC systems

Liquefaction of hazelnut seed coat by supercritical gas extraction

Optimization of the thermodynamic model of aqua-ammonia absorption refrigeration systems

On the global approach of the National Power System development in Romania

Some aspects of a PV/T collector/forced circulation flat plate solar water heater with solar cells

Energy conservation with efficient electric drives

Photovoltaic technology: basic concepts, sizing of a stand alone photovoltaic system for domestic applications and preliminary economic analysis

Reliability and economic analysis of a power generation system including a photovoltaic system

Experimental study of the performance of a solar collector cooled by heat pipes

Investigation of the thermal efficiencies of a solar dryer

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