Showing papers in "Applied Energy in 2004"

TL;DR: In this article, the forecasting abilities of a battery of univariate models on hourly electricity spot prices, using data from the Leipzig Power Exchange, were studied using an autoregressive model.

TL;DR: In this article, the authors report the results of a survey using the contingent valuation method (CVM) of the willingness of Japanese households to pay more, in the form of a flat monthly surcharge, for renewable energy.

TL;DR: In this paper, the movement of a photo-voltaic module was controlled to follow the Sun's radiation using a programmable logic-controller (PLC) unit, and the daily output power of the PV was increased by more than 20% in comparison with that of a fixed module.

TL;DR: In this paper, an artificial neural network is trained using the results of a small number of TRNSYS simulations, to learn the correlation of collector area and storage-tank size on the auxiliary energy required by the system from which the life-cycle savings can be estimated.

TL;DR: In this paper, the optimum insulation-thickness of the external wall for the five different energy-sources (coal, natural gas, LPG, fuel oil and electricity) and two different insulation materials (expanded polystyrene, rock wool) are calculated for Denizli.

TL;DR: In this article, a simple mathematical procedure for the estimation of the optimal tilt angle of a collector is presented based on the monthly horizontal radiation, and a contour map is presented for the entire year in China.

TL;DR: Two NN based energy-consumption models were developed to estimate the space and domestic hot-water heating energy consumptions in the Canadian residential sector and the NN methodology used in developing the models, the accuracy of the predictions, and some sample results are presented.

TL;DR: In this article, the potential revenue from CH4-enriched biogas when replacing petrol is higher than that for replacing diesel (Irish prices), and the preferred solution involves transport fuel production with the production of CHP to meet electricity demand on site.

TL;DR: In this paper, a perceptron neural-network technique is applied to estimate hourly values of the diffuse solar-radiation at the surface in Sao Paulo City, Brazil, using as input the global solar radiation and other meteorological parameters measured from 1998 to 2001.

TL;DR: In this paper, a scheme for on-line fault detection and diagnosis (FDD) at the subsystem level in an air-handling unit (AHU) is described.

TL;DR: In this paper, the authors explore the ways in which Nigerian manufacturing industries can implement TPM as a strategy and culture for improving its performance and suggest self-auditing and bench-marking as desirable prerequisites before TPM implementation.

TL;DR: In this article, a case study of a municipality with district heating supplied via boilers and combined heat-and-power (CHP) plants is studied, where heat storage can be used to maximise the amount of electricity produced in the CHP plants during peak-price periods.

TL;DR: In this article, a solar-ground source heat-pump (SGSHP) system with a vertical double-spiral coil (VDSC) ground heat-exchanger (GHX) is presented.

TL;DR: In this article, the authors examined the energy and CO2 embodied in a particular wind-turbine manufactured in Brazil and in Germany and demonstrated the importance of adequately considering the background system of the local economy.

TL;DR: In this paper, the authors developed a simplified analytical model which predicts the solid-liquid interface location and temperature distribution of the fin in the solidification process with a constant end-wall temperature in the finned two-dimensional phase-change material (PCM) store.

TL;DR: In this article, the authors studied the energy-conservation opportunity in an institutional building through cogeneration with double-effect absorption chiller, and its technical and economical feasibility is evaluated and presented.

TL;DR: In this article, two solar stills (single basin and double decker) were fabricated and tested and two types of measurements were performed; one with the stillsides insulated and the other without.

TL;DR: In this article, the conical-ring turbulators used for heat transfer enhancement in heat exchangers are investigated experimentally and the effects of the promoters on the heat transfer and friction factor are investigated for all the arrangements.

TL;DR: In this article, the performance characteristics of conical-ring turbulators are determined by means of the entropy-generation minimization method based on the second law and enhancement efficiency based on thermodynamics.

TL;DR: In this paper, the energy potentials of the main biomass resources in the north-eastern region of Brazil have been assessed and the success of PROINFA depends on the availability of reliable studies for assessing existing biomass resources and the viability of their utilisation for power generation.

TL;DR: In this article, the authors conducted surveys to obtain information about the building design and energy end-use characteristics of high-rise residential buildings in Hong Kong, including the floor areas of residential flats, the ratios of the areas of bedrooms and living and dining rooms to the total flat area, the window-to-wall area ratios, the types of fenestration, and the external-shading devices in facades of residential buildings.

TL;DR: In this paper, the optimal ecological performance of a Newton's law generalized irreversible Carnot engine with losses due to heat-resistance, heat leak and internal irreversibility is derived by taking an ecological optimization criterion as the objective.

TL;DR: In this article, two solar-stills (single basin and double decker) were fully fabricated and tested at the Campus of the University of Bahrain and two types of measurements were performed; one with still-sides insulation and the other without.

TL;DR: In this article, an engine diagnostic structure is proposed using several artificial neural networks (ANNs) to distinguish between single-component faults (SCFs) and double component faults (DCFs).

TL;DR: In this article, the authors reviewed gas-path diagnostic methods and the specifications for such effective tools, together with pertinent future prospects, for the aircraft industry and their application in the field of engine condition monitoring.

TL;DR: In this article, a case study is performed in which a Swedish utility is analyzed using three different methods for calculating the marginal costs of heat supply: a manual spreadsheet method, an optimising linear-programming model, and a least-cost dispatch simulation model.

TL;DR: In this paper, a simplified model for indirect cooling towers behavior is presented, which is devoted to building simulation tools and fulfils several criteria such as simplicity of parameterisation, accuracy, possibility to model the equipment under various operation conditions and short computation time.

TL;DR: In this article, a flat-plate collector's performance equations are integrated over the whole absorber circumference and the model determines the shading on the tubes as a function of the solar azimuth.

TL;DR: In this article, the performance of a heat pump to maintain the greenhouse air at a day temperature of 27°C and night temperature of 18°C with a relative humidity of 40% spans 1.2-4.0 and 1000-16,000 kJ/kg for COP and SEC, respectively.