Showing papers in "Energy Conversion and Management in 2001"

TL;DR: The conversion technologies for utilizing biomass can be separated into four basic categories: direct combustion processes, thermochemical processes, biochemical processes and agrochemical processes as discussed by the authors, which can be subdivided into gasification, pyrolysis, supercritical fluid extraction and direct liquefaction.

TL;DR: In this paper, an equilibrium model was used to predict the gasification process in a downdraft gasifier and the composition of the producer gas and hence the calorific value have been determined.

TL;DR: In this article, a Rankine cycle using organic fluids as working fluids was investigated in recovering low enthalpy containing heat sources and it was shown that p-Xylene showed the highest efficiency while Benzene showed the lowest.

TL;DR: In this article, the higher heating values (HHV) of 14 biomass fuels were correlated with their lignin content, and there was a highly significant linear correlation between the HHV of the biomass fuel and the L 1 content.

TL;DR: Using black rubber or black gravel materials within a single sloped solar still as a storage medium is examined in this article, and the experimental results showed that using black gravel of 20-30 mm size improves the productivity by 19% at the conditions of 20 l/m2 brine volume and 15° of glass cover angle.

TL;DR: In this paper, the impact of climate changes on the urban environment may be assessed by calculating the modifications in energy production and consumption for such daily operations as heating and cooling in the southeastern Mediterranean (the area of Greece) were simulated for the year 2030.

TL;DR: In this article, the authors focused on using the fiber and shell obtained from the processing of palm oil as fuels for the boiler instead of fossil fuel and discussed the possibility of excess air and fuel air ratio for the palm oil combustion process.

TL;DR: For example, Turkey has experienced extremely sharp economic growth in recent years, which was largely achieved through a rapidly increasing population as discussed by the authors, and because of its demographic and economic growth, Turkey constitutes a major energy market.

TL;DR: In this paper, the chemical composition and yields of charcoal, gas, condensed liquid and tar were determined as a function of the carbonization temperature, and a ranking of the agricultural and forestry residues was constructed in terms of their suitability for charcoal production.

TL;DR: In this article, the authors present an extensive review of studies about the natural convective heat transfer coefficient on isolated vertical and horizontal surfaces with special interest in their application to building geometries.

TL;DR: In this paper, an extensive review of studies about natural convective heat transfer coefficients on surfaces in two-and three-dimensional enclosures with primary focus on those with a direct application to heat transfer in buildings is presented.

TL;DR: The pyroligneous acid consists of about 50% methanol, acetone, phenols and water as mentioned in this paper, which can be used as one possible replacement for conventional gasoline and Diesel fuel.

TL;DR: In this article, the characteristics of combustion with highly preheated air were studied to understand the change of combustion regime and the reason for the compatibility between high performance and low nitric oxide emission.

TL;DR: In this paper, an analysis was conducted for a multi-type inverter air conditioner with a linear electronic valve as the expansion device and a variable speed compressor, and the system performance was analyzed with variations of operating frequency of the compressor, cooling load imposed on the system and cooling load fraction (i.e. load ratio) between rooms in which is installed an evaporator.

TL;DR: In this article, the results of a recent survey on energy consumption in the residential sector of Jordan were used to evaluate energy conservation in residential buildings Space heating accounts for 61% of the total residential energy consumption with kerosene as the most popular fuel used for heating.

TL;DR: In this article, the authors derived an approximate optimal design that is applicable to systems with a small temperature difference between the reservoirs and the heat exchangers, where the optimal configuration splits the total temperature drop evenly between the thermoelectric module and the hot side and cold side heat exchanger.

TL;DR: In this article, the possibility to create a combined wind-hydro energy station in a medium size island of the Aegean Archipelago is investigated on a techno-economic basis.

TL;DR: In this paper, it is shown that the Curzon-Ahlborn efficiency ηCA determines the efficiency at maximum power production of heat engines only affected by the irreversibility of finite rate heat transfer (endoreversible engines), but ηC is not the upper bound of the efficiencies of all heat engines.

TL;DR: In this article, a mathematical model has been developed to determine and optimize the thermal and economical performance of large scale photovoltaic-electrolyzer systems, either with fixed or sun tracking panels using hourly solar radiation data.

TL;DR: In this article, an energy management system, adopting the so-called hybridization of energy sources, is proposed to coordinate multiple energy sources for EVs, leading to optimized fuel economy while fulfilling the expected driving range and maintaining other EV performances.

TL;DR: In this article, a finite-time thermodynamic evaluation of the Stirling and Ericsson heat engines is presented, where both cycles with an ideal regenerator (ϵR=100) are as efficient as an endoreversible Carnot heat engine operating at the same conditions.

TL;DR: In this article, the effect of heat exchangers on the system performance in an aqua-ammonia absorption refrigeration system has been investigated, and the irreversibilities in the thermal processes have been determined for three different cases.

TL;DR: In this article, the effects of diluents to displace oxygen (O2) in the intake air resulted in a reduction in the O2 supplied to the engine, increased the inlet charge thermal capacity (thermal effect), and potentially CO2 and N2 participated in the combustion process.

TL;DR: In the case of oxy-fuel combustion, the NOx emissions are also very high if conventional burners are used as discussed by the authors, and staged combustion achieves similar NOx reductions in glass melting furnaces.

TL;DR: In this article, the authors used fuzzy set methodology to perform the comparison between different solar systems for various applications, and determined the order in which solar systems should be given higher priority to be used in Jordan.

TL;DR: In this article, a steady state computer simulation model was developed to predict the performance of an absorption refrigeration system using LiBr-H2O as a working pair, based on detailed mass and energy balances and heat and mass transfer relationships for the cycle components.

TL;DR: In this article, two models for estimating monthly average daily global radiation on a horizontal surface have been applied to four different locations and the agreement between the measured and computed values is remarkable, and the models are both recommended for use in Algeria and in any location with similar climatic parameters.

TL;DR: In this article, an attempt has been made to evaluate the convective heat transfer coefficient operating in crop drying in open sun drying conditions (natural convection) using linear regression analysis from experimental data obtained for six crops, namely green chillies, green peas, Kabuli chana, onion, potato and cauliflower.

TL;DR: In this paper, the authors investigated the gasification of rice husk char in carbon dioxide and steam for determining the kinetic parameters, and the results obtained are in good agreement with literature values of different char gasification reactions.