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The thermochemical conversion of biomass can be effective for flexible and programmable production of electric and thermal power. Only a few models have been developed so far in the literature to describe the behavior of a screw reactor system designed for biomass fast pyrolysis. The temperature profile plays a crucial role in particular for fast pyrolysis purposes. Hence, a complete heat transfer...
Generally, the 2nd Law is stated in negative, passive terms, in a way that says what cannot happen, or what the best possible outcome could be, or what is an inevitable (e.g., inopportune) consequence. Granted, there has been productive usage of the exergy concept, to do ‘2nd Law Analysis’. Granted, there are statements saying that a consequence of every process is the generation of entropy. And there...
This paper presents an experimental investigation on pull-down performance of an ejector enhanced auto-cascade refrigeration cycle for low-temperature freezer application. The pull-down performances of the freezer established on the ejector enhanced cycle and conventional auto-cascade refrigeration cycle were compared. Additionally, operation behaviors of the ejector and the new cycle based freezer...
To utilize heat from round shaped heat sources or heat sinks effectively, a segmented annular thermoelectric generator was proposed. Each leg is composed of two materials with different optimum operating temperatures jointed in series. Based upon a developed theoretical model, the influences of annular shape parameter, height ratios of high temperature segment to leg in p- and n-type legs, temperature...
CO2 transportation safety can directly affect the implementation of carbon capture, utilization and storage (CCUS) projects. The assessment of consequences of accidental release of supercritical CO2 are very important in the consideration of CO2 transportation safety. To ensure accurate prediction of the consequence of an accidental CO2 release, the near-field source terms including thermo-hydraulics...
The article presents a new technical solution for designingmicroturbine nozzles. The nozzles have a rectangular cross section, the longitudinal axis of the accelerating section is straight, and its projection onto the plane of the nozzle is placed at a tangent to thecircle formed by the middle diameter of the turbine. This makes it possible to increase the efficiency of the microturbines, which have...
This study contributes to synthetic improvement and evaluation of energy efficiency and cleaner production by using combined injection in a gasoline-hydrogen blended engine bench. According to the previous published literature, few researches deal with combined injection technology, especial hydrogen combined injection. The equivalence ratio was kept at 0.77 and the energy input into the engine was...
Compared with single-stage latent heat storage, cascaded latent heat storage is considered as an effective way to store and utilize intermittent or fluctuant thermal energy due to an increased heat transfer rate, a uniform and lower HTF outlet temperature, faster charging/discharging processes and higher exergy efficiency. In this paper, an experimental three-stage latent heat storage system filled...
Boosting biomethane production makes it possible to offset the required energy in a wastewater treatment plant. In this research, using batch biomethane potential assays, various techniques including pretreatment, co-digestion, and digestion temperature rise were evaluated to increase the methane productivity of municipal sewage sludge (SS). Between thermal and sonication pretreatment methods, thermal...
Energy system simulation tools are important to assess and plan the energy transition to future power systems with large integration of renewables. The calibration of power balance models, to assure that they accurately reproduce the energy system, is usually made by the reproduction of a single year past time series. This makes the calibration sensitive to that year's particular conditions, such...
This paper presents a multi-criteria evaluation analysis of the optimal price of electricity of solar power plants and small hydro power plants. The objective of this paper is to deal with the technical and economical part of the investment in the construction of solar power plant and small hydro power plant. Based on reviewed literature no paper was found that compare technical and economical analysis...
The paper introduces multi-agent system (MAS) for intelligent scheduling model of multi-MG autonomy-cooperative operation. Firstly, wind power plants (WPPs), photovoltaic generators (PVs), conventional gas turbines, energy storage systems (ESSs) and controllable loads (CLs) are integrated into MGs with the price-based demand response (PBDR). Then, a 3-layer coordinate control system framework is designed...
Buildings consume 40% of the total primary energy use worldwide and it could increase if no energy efficiency measures are taken. Diffusion of nearly zero energy buildings is among building energy efficiency measures in many countries. Synergy of energy reduction in buildings and efficiency increase in district heating and cooling networks is part of Smart Energy Systems. Utilisation of solar energy...
The continuous technological development in the field of solar thermal application is a pressing need to harvest and utilize the solar energy in an efficient manner. Development of a flat plate cooking unit (FPCU) intended for the indirect mode of solar cooking has been attempted. In this paper, the performance of the FPCU integrated with the latent heat thermal energy storage system is studied experimentally...
Recent research has seen several forecasting methods being applied for heat load forecasting of district heating networks. This paper presents two methods that gain significant improvements compared to the previous works. First, an automated way of handling non-linear dependencies in linear models is presented. In this context, the paper implements a new method for feature selection based on [1],...
As a highly efficient cryogenic heat transfer device, cryogenic loop heat pipe (CLHP) promises great application potential in the thermal control of future space infrared detection system. In this work, a CLHP using methane as working fluid operating at 100–190 K was developed, and its thermal performance including the supercritical startup, heat transport capacity under different heat sink, power...
Solid fuel stoves are used by over a third of the world's population for cooking and space heating. Efforts are being made to develop cookstoves with higher combustion and thermal efficiencies, but these efforts lack support of numerical models for predicting emissions that can be used in the design process. This work presents a simplified steady-state model to simulate combustion in a top-lit updraft...
The stability of a turbulent diffusion flame temperature in an atmospheric gas-turbine combustor is investigated experimentally over a range of operating conditions to study the combined effect of hydrogen-enriched- methane (as fuel) and oxygen with carbon dioxide (oxy-fuel, as the oxidizer) on the combustion flame stability. These conditions included varying fuel and oxidizer mixture compositions,...
In this work, an effective adsorbent (polyHIPE/PEI) was developed for use in CO2 capture technologies. For this purpose, a porous polymer was prepared by high internal phase emulsion (HIPE) using 2-Ethylhexyl methacrylate (EHMA) and divinylbenzene (DVB). This prepared porous polymer (polyHIPE) was then used as a novel support for the wet impregnation of polyethylenimine (PEI), thus resulting in the...
The link between climate and energy consumption has been widely established in many cities. The residential electricity consumption majorly for space conditioning is especially responsive to the outdoor climate. As a hot and humid tropical city, Singapore is expected to see increasing residential electricity consumption with global climate change. In this study, a multiple regression analysis is performed...
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