International Journal of Low-Carbon Technologies

http://ijlct.oxfordjournals.org

List of Papers (Total 435)

A novel solar façade concept for energy polygeneration in buildings

A novel concept for a building façade is presented. The façade uses solar energy to generate electricity, heating or cooling, by combining photovoltaic solar cells with a solar air collector and thermoelectric (TE) heat pumps, into a compact building envelope solution. The generated electricity may be partially or totally used to provide heating or cooling through the use of TE...

Analysis of compressed air energy storage for large-scale wind energy in Suez, Egypt

Renewable energy systems are considered essential green energy technologies that could replace a considerable proportion of the current fossil fuel-based electricity generation systems; hence the interest in these technologies is on the rise. However, due to the intermittence nature of most of the renewable energy sources, in particular wind and solar, there are major concerns...

Theoretical investigations on combined power and ejector cooling system powered by low-grade energy source

A combined power and cooling system is proposed for cogeneration, which integrates the ejector cooling cycle with the Rankine cycle. Low-temperature heat source such as industrial waste heat or solar energy can be used to drive the Rankine cycle. This system will provide electricity and cooling effect simultaneously without consuming primary energy. The partially expanded vapor...

Review of solar, heat pipe and thermoelectric hybrid systems for power generation and heating

Solar energy is a renewable energy heat source freely and widely available everywhere throughout the year. Heat pipes are very effective and passive heat transfer devices. A solar heat pipe collector performs well at high temperatures. Thermoelectricity could be utilized for power generation and provide cooling and heating. The combination of a solar heat pipe collector with...

Comparison of copper and glass oscillating heat pipes with Fe2O3 under magnetic field

This paper presents the findings from an experimental investigation on the performance effect of magnetic field when applied to oscillating heat pipes (OHPs) using kerosene with Fe2O3 nanoparticles as the working fluid. Two types of OHPs were used in this investigation: copper surface OHP and glass surface OHP. The temperature distribution and heat transfer rate through the OHPs...

Modeling solubility of carbon dioxide in reservoir brine via smart techniques: application to carbon dioxide storage

Nowadays, reduction of carbon dioxide (CO2) in the atmosphere via sequestration in deep saline aquifers is studied by numerous researchers. Solubility of CO2 in reservoir brine is a most important parameter in CO2 sequestration saline aquifers. Owing to the importance of this issue, in this paper different methods based on the concept of artificial intelligence, such as particle...

Design and optimization of a thermoacoustic heat engine using reinforcement learning

The thermoacoustic heat engine (TAHE) is a type of prime mover that converts thermal power to acoustic power. It is composed of two heat exchangers (the devices heat source and sink), some kind of porous medium where the conversion of power takes place and a tube that houses the acoustic wave produced. Its simple design and the fact that it is one of a few prime movers that do...

A comprehensive assessment of sectoral energy consumption in the UK: past, present and future

Primary energy consumption has increased by 49% and CO2 emissions by 43% during the last two decades, and the predictions indicate that the growing trend will continue as a consequence of the notable growth in world population. Nations with developing economies (South America, Middle East, Africa and Southeast Asia) have an average annual energy consumption rate of 3.2%, whereas...

Review of heat pipe heat exchangers for enhanced dehumidification and cooling in air conditioning systems

Heat pipe heat exchangers could be employed as run-around coils in air conditioning systems for enhanced dehumidification and cooling. This article reviews some of the works conducted on the cooling and dehumidification aspects in various air conditioning systems. They have been proved to be effective in enhancing dehumidification and reducing air conditioning costs especially in...

Newly invented biobased materials from low-carbon, diverted waste fibers: research methods, testing, and full-scale application in a case study structure

This project demonstrates newly invented, biobased construction materials developed by applying low-carbon, biomass waste sources through the Authors' engineered fiber processes and technology. If manufactured and applied large-scale the project inventions can divert large volumes of cellulose waste into high-performance, low embodied energy, environmental construction...

Effect of the working liquid to the capillary pumped loop performance

The purpose of this paper is to present a theoretical analysis of the capillary pumped loop (CPL) performance using different working liquids. CPL is a passive heat transfer device, using no mechanical pump to circulate the working liquid, usually composed of a liquid tank, an evaporator, a condenser, a liquid and a vapor line. Heat load is applied on the external surface of the...

Heating load and COP optimization of a double resonance energy selective electron (ESE) heat pump

A model of a double resonance energy selective electron (ESE) heat pump in one-dimensional system with two idealized energy filters is established in this paper. The analytical expressions of heating load and coefficient of performance (COP) for the ESE heat pump are derived. The optimum heating load and COP performances of the double resonance ESE heat pump are analyzed by using...

Effects of thermocouples’ physical size on the performance of the TEG–TEH system

The effects of thermocouples physical size on the performance of a thermoelectric heat pump (TEH) driven by a thermoelectric generator (TEG) device are investigated in this article. The physical size refers to the length and the cross-sectional area of the thermocouples. The performance analysis is multiobjective, including stable electrical current, heating load, coefficient of...

Alternative coating technologies for metal–ceramic nanocomposite films: potential application for solar thermal absorber

Metal–ceramic nanocomposite films for solar absorbers have been obtained by electro-deposition. This coating technique uses a mixed solution of nickel nanoparticles and sub-micron alumina particles. The relative ratio of Ni-to-Al in these films is varied by tuning the concentration of nickel and alumina particles in the starting solution. Three films with different Ni/Al ratio...

Performance study of a static low-concentration evacuated tube solar collector for medium-temperature applications

With the development of the energy demands, solar energy medium-temperature applications (>80°C) for refrigeration, building heating, seawater desalination, thermal power generation etc. has become popular research fields. The article presents an investigation on a static low-concentration evacuated tube (LCET) solar collector for medium-temperature applications. Ray trace...

Endoreversible modeling and optimization of multistage isothermal chemical engines under linear mass transfer law via Hamilton–Jacobi–Bellman theory

A multistage continuous isothermal endoreversible chemical engine system with a finite driving fluid is investigated in this paper, and the mass transfer law obeys the linear mass transfer law [<mml:math><mml:mi>g</mml:mi><mml:mo>∝</mml:mo><mml:mi mathvariant="normal">Δ</mml:mi><mml:mi>μ</mml:mi></mml:math>g∝Δμ]. Under the condition that both the initial time and the initial key...

Numerical assessment of energy contribution by building integrated photovoltaics in a commercial/office building refurbishment in UK

The generation and supply of electricity to residential and commercial/office buildings has been well established in different parts of the world for some decades now. However, sources like coal, nuclear and gas turbine electric generators which constitute most of the technologies applied in grid power stations usually involve fossil fuels and carbon dioxide emissions which are...

Improving photovoltaics performance by using yellow petroleum jelly as phase change material

Indonesia is blessed with solar energy. Photovoltaic (PV) experiences an internal problem of efficiency reduction due to temperature increase. The use of phase change material as a passive cooling has been conducted to address this problem. In this study, yellow petroleum jelly is used as passive cooling on photovoltaic. The jelly performs effectively in reducing the temperature...

Applying a sophisticated approach to predict CO2 solubility in brines: application to CO2 sequestration

Specification of CO2 and brine phase behaviour plays a vital role in CO2 sequestration and CO2 reduction from atmosphere to deep saline aquifers. Because CO2 solubility in brines determine how much carbon can be stored in deep saline aquifers. To tackle the referred issue, high precise model with low uncertainty parameters called ‘least square support vector machine (LS-SVM)’ was...

Thermodynamic analysis and optimization of the Atkinson engine by using NSGA-II

Recently, several studies have been conducted regarding the Atkinson cycle and Atkinson engine which have resulted in various thermal efficiency and output power analysis. In the present study, output power and engine thermal efficiency are maximized via employing the NSGA-II approach and thermodynamic analysis. The multi-objective evolutionary approach on the basis of the NSGA...

Investigating the potential of adding thermal mass to mitigate overheating in a super-insulated low-energy timber house

Evidence suggests that many UK dwellings are subjected to overheating or will be at some point in the future. Dwellings built using modern methods of construction may have a higher overheating risk due to the low levels of thermal mass associated with most of these methods. The Nottingham HOUSE, a prefabricated timber modular building designed to zero-carbon and Passivhaus...

Towards clean and sustainable distributed energy system: the potential of integrated PEMFC-CHP

The mitigation options to meet the ambitious carbon reduction targets set by the UK government are discussed in this paper, including the use of carbon capture and storage (CCS) technology, clean renewable energy integration and a proposed system of integrated fuel cell combined heat and power (FC-CHP) technology. Analysis shows that the use of CCS technology within the current...

The performance and in-use experience of low to zero carbon technologies in an experimental energy home

In the UK, finances and resources are invested into the application of new technologies, construction materials and control systems for homes, with the aim of improving energy efficiency. One such example is the experimental BASF house, built to study the thermal performance to achieve a comfortable home that uses energy efficiently. The house includes low to zero carbon (LZC...

Thermal analysis of PCM-filled glass windows in hot summer and cold winter area

Phase change material (PCM)-filled glass window was suitable for absorbing or releasing more heat than conventional glass window. Comparisons of thermal performance between PCM-filled glass windows and insulated glass windows (double glass windows filled with dry air and surrounded by sealing strips) were presented in this paper. A 3D unsteady model was built in FLUENT to obtain...

Capturing atmospheric carbon: biological and nonbiological methods

Atmospheric carbon dioxide is one of the primary greenhouse gases on earth and its continuous emission by manmade activities is leading to a rise in atmospheric temperature. On the other hand, various natural phenomena exist that contribute to the sequestration of atmospheric carbon dioxide, i.e. its capture and long-term storage. These phenomena include oceanic, geological and...