Showing papers in "Energy Conversion and Management in 1998"

TL;DR: In this article, the development of available thermal energy storage (TES) technologies and their individual pros and cons for space and water heating applications are reviewed and compared for low temperature applications, where water is used as a storage medium.

TL;DR: In this article, the inherent pros and cons of the two common (i chilled water and ice storage) commercially available thermal energy storage (TES) technologies for off-peak air conditioning applications are described.

TL;DR: In this article, the performance of the ammonia-sodium thiocyanate cycle is compared with that of the ammonium-lithium nitrate cycle, and it is found that ammonia-thiam nitrate cycles are suitable alternatives to ammonia-water absorption.

TL;DR: In this article, an introduction to chemical-looping combustion (CLC) is given and a detailed exergy analysis of two different CLC gas turbine (GT) systems are also presented.

TL;DR: In this article, the thermal performance of a latent heat storage system with and without fins has been analyzed using an enthalpy formation and a fully implicit finite difference method, and the magnitude of the melt fraction with fins is found to be considerable, dominating the melting fraction when no fin is used.

TL;DR: In this article, a two-cylinder, indirect-injection diesel engine of stationary type is used as the first experimental test bed in this work and the variation of quality is provided by mixing natural gas and carbon dioxide.

TL;DR: In this paper, two concepts of CO2 removal in CC are compared from the performance point of view, and the results show that the system efficiency with partial recirculation and a CO2 scrubber is always higher by 2-3% points than the CO2-based CC efficiency in comparable conditions.

TL;DR: In this paper, regression and correlation analyses were performed to investigate the relationship between residential electricity consumption and economic variables and climatic factors for Hong Kong Economic and energy data for the 23-year period from 1971 to 1993 have been gathered and analyzed.

TL;DR: In this article, a variable capacity direct expansion solar-assisted heat pump system is developed and operated for domestic hot water application, which employs a bare solar collector which also acts as the system evaporator.

TL;DR: In this article, the authors present a decision making support method based on fuzzy logic for renewable energy diffusion strategies, which takes into account the uncertainties of all the specific assessments, the qualitative nature of some indexes, the weight of the preferences or willingness systems of the decision maker.

TL;DR: In this paper, an experimental study was performed to investigate the effect of using a two-axis sun tracking system on the thermal performance of compound parabolic concentrators (CPC).

TL;DR: In this article, finite-time thermodynamics has been applied to optimize the power output of closed Brayton cycles for infinite thermal capacitance rates of the heat reservoirs, and the optimum values of power, thermal efficiency and second-law efficiency of Brayton cycle are presented.

TL;DR: In this article, the relation between net work output and efficiency of an air-standard Otto cycle is derived, and the maximum and the corresponding efficiency bound of the cycle with heat transfer considerations are also found.

TL;DR: In this article, an exergy analysis is performed to analyse the possibilities of fuel saving in the cryogenic distillation process, which is the main method of air separation, and it is shown that more than half of the exergy loss takes place in the liquefaction unit and almost one-third in the air compression unit.

TL;DR: In this article, an optimal performance analysis for a Stirling engine with heat transfer and imperfect regeneration irreversibilities is performed and the relationship between the net power output and thermal efficiency of the engine is derived.

TL;DR: In this paper, the embodied energy of the four main materials used in the construction of an inert gas filled, double-glazed window, of a given size, was quantified.

TL;DR: In this paper, different solvents and their mixtures were used in simple and supercritical extractions Basic catalysts, such as NaOH, Na2CO3 and K2 CO3, were used for catalytic conversion experiments.

TL;DR: In this article, the power density (the ratio of the power to the maximum specific volume in the cycle) is maximized for an Atkinson engine, and the results showed that the efficiency at maximum power density is always greater than that at maximum output power.

TL;DR: In this article, a review of the state-of-the-art hydrate-film modeling models is presented, and if any, its weakness in physical reality or mathematical formulation is pointed out.

TL;DR: In this paper, a flat-plate solar collector and a basin type solar still are coupled to form a naturally circulating closed loop, and the average daily production of distilled water has been found to be 100% higher than for a simple basin-type solar still.

TL;DR: In this paper, an assessment of the availability of agricultural residues as raw materials for biomass gasification and briquetting in India has been made with due consideration to their seasonal and geographical availability dimensions.

TL;DR: In this article, the possibility of obtaining light-boiling organic products (Tboil to 150°C), or a mixture of the light (∼150°C) and heavy (200-280°C).

TL;DR: In this paper, the optimal performance for forward and reverse quantum Stirling cycles is studied and the finite time thermodynamic performance bound and optimization criteria for these cycles are derived. And the optimal relations between the performance parameters for quantum Stirl engines, refrigerators and heat pumps are obtained.

TL;DR: In this article, the performance of a CAES plant comprising: generated energy Egen, energy ratio ER and primary energy efficiency ηpe, is evaluated over a wide range of pressure ratio Rc and load, which depends on the rate of air discharged mt.

TL;DR: In this paper, the effect of heat resistance on the performance of an air refrigeration cycle is analyzed with a finite time heat transfer analysis with nonisentropic compression and expansion.

TL;DR: In this article, a novel power cycle consisting of the Battelle gasification process, a molten carbonate fuel cell, and a steam turbine is introduced, and an economic analysis and electricity cost projection are performed for a power plant consuming 2000 tons of biomass per day.

TL;DR: In this paper, a new cycle model, which includes the heat leak from the heat sink to the cooled space and irreversibilities due to the internal dissipation of the working fluid besides the finite-rate heat transfer between the working liquid and the external heat reservoirs, is established and used to calculate the maximum coefficient of performance and cooling rate of the absorption refrigeration system for a given total heat-transfer area of the heat exchangers.

TL;DR: In this article, the performance characteristics of the two cycles for the same boundary conditions (i.e. same heat source/sink inlet temperatures, thermal capacitance rates, and heat exchanger conductances) are compared.

TL;DR: Based on the analysis of various existing criteria, the authors proposes a new thermodynamic performance criterion, the cogeneration efficiency, which considers not only the difference in quality of energy, but also the anergy's effect in heating.

TL;DR: In this paper, a review of recent theoretical developments toward predicting macroscopic organization (the occurrence of shape and structure) in natural flow systems, animate and inanimate, is presented.