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Organic Rankine cycle with liquid-flooded expansion and internal regeneration (ORCLFE) has been demonstrated leading to improvements in system efficiency with respect to conventional ORC with internal regeneration in the heat input temperature range from 80 ∘C to 200 ∘C. From a previous study [1], it was concluded that the selection of the positive displacement expander, the working fluid and its...
Trigger control strategy is of vital importance for the multistage synchronous induction coilgun (MSSICG). According to the operating principle of MSSICG, we can theoretically obtain a sustained and steady acceleration which is sufficient to push the projectile to high speed by means of continuously increasing the series of driving coils and matching with the appropriate trigger strategy. However,...
In order to reduce the harmful emissions from marine diesel engines, the use of alternative fuels is a promising option. In this study, the combustion process and NOx emissions and composition ratios of waste cooking oil biodiesel on a marine auxiliary diesel engine were investigated experimentally. Four different blended ratios of biodiesel and diesel were selected. The results showed that the peak...
The falling film dehumidifier is a key component in the liquid desiccant cooling system (LDCS). However, the most commonly used metals, such as steel and aluminum, can hardly resist the erosion of liquid desiccant. It greatly limits the fabrication of compact dehumidifiers and hinders the promotion of LDCS. The present study introduced a novel falling film dehumidifier which was made by the metal...
The present work reports the enhancement in free cooling potential using a modified cooling system compared to the conventional free cooling system. The proposed modified system is a novel pilot scale model packed with spherically encapsulated phase change material in a cylindrical tank along with water spray nozzles (direct evaporative cooling unit) at the inlet of the tank. The experiments were...
Impedance and open circuit voltage (OCV) parameter identification is the key technology for state of health (SOH) diagnosis of lithium ion battery (LIB) in an equivalent circuit model (ECM). The current identification methods of impedance and OCV parameter are time consuming, destructive, non-real-time and costly. It is usually difficult to identify each component from the overall impedance parameter...
In the last decades, the world's energy consumption has increased rapidly due to fundamental changes in the industry and economy. In such terms, accurate demand forecasts are imperative for decision makers to develop an optimal strategy that includes not only risk reduction, but also the betterment of the economy and society as a whole. This paper expands the fields of application of combined Bootstrap...
Thermal management performance of two composite phase change materials (PCMs)—a highly thermally conductive 60 wt% RT44HC/expanded graphite (EG) composite and a 60 wt% RT44HC/fumed silica composite with a lower thermal conductivity—is studied for a 20-cell Li-ion battery pack working at 5 and −10 °C. The temperature and voltage distributions in each battery pack are measured during single-discharge...
Travelling-wave thermoacoustic heat engine is capable of converting heat to acoustic power which in turn can be used to generate electricity by a linear alternator. The thermoacoustic heat engine can work in a wide range of heat quality, giving it the ability to be used for waste heat recovery. In this paper, a new configuration of looped-tube travelling wave thermoacoustic engine is proposed, which...
Low temperature power generation system based on organic Rankine cycle (ORC) has been a popular candidate for low grade heat utilization and recovery. To find a way to predict the performance of the ORC system, the exploration and analyses of the Support Vector Machine (SVM) and Back Propagation Artificial Neural Network (BP-ANN) were carried out. For comparison, both Gauss Radial Basis kernel function...
This paper is aimed at investigating the performance of a Savonius generator in the presence of external aerodynamic appendages. The Savonius generator is a slender (high aspect ratio) vertical axis wind turbine and is part of a public lighting system (a street lamp) powered by renewable energy sources, particularly wind and solar energy. The external elements are self aligning systems, a conveyor...
This article analyses the diffusion and adoption of solar energy conversion systems in Greece during the last forty years. The installed capacity of solar thermal and solar electricity systems and the effects of the policies implemented during this period are analysed. Furthermore, the contribution of solar conversion systems to the energy security of Greece and to the reduction of greenhouse gases...
A liquefied petroleum gas (LPG) enriched port injection start aid was used to improve firing and emissions characteristics and overcome cold start difficulties for spark ignition (SI) methanol engines at low ambient temperature. The effects of injection timing of methanol and LPG addition fraction on cold start firing; and hydrocarbon (HC), formaldehyde, and unburned methanol emissions were investigated...
Amid the expansion of environmentally friendly vehicles as a strategy to cope with climate change and avoid fine particles, South Korea has set a penetration goal and implemented a support policy. The present study uses a discrete choice experiment and a mixed logit model to analyze consumer preferences for vehicles and predict the dynamic market share of environmentally friendly vehicles. The estimated...
We evaluate an ambient, bidirectional thermal network, which uses a single circuit for both district heating and cooling. When in net more cooling is needed than heating, the system circulates from a central plant in one direction. When more heating is needed, the system circulates in the opposite direction. A large benefit of this design is that buildings can recover waste heat from each other directly...
Testing of lithium ion batteries is necessary in order to understand their performance, to parameterise and furthermore validate models to predict their behaviour. Tests of this nature are normally conducted in thermal/climate chambers which use forced air convection to distribute heat. However, as they control air temperature, and cannot easily adapt to the changing rate of heat generated within...
Load prediction is the first step in designing an efficient community district heating system (CDHS). Even though several methods have been developed to predict the heating demand profile of buildings, there is a lack of method that can predict this profile for a large-scale community with a numerous user types in a timely manner and with an appropriate level of precision.This paper, first briefly...
The natural ocean/river currents energy can be harvested using Flow Induced Motion (FIM) phenomena. The effect of damping-ratio and mass-ratio on Flow Induced Motion energy harnessing of a square cylinder are numerically investigated for Reynolds number 15500 < Re < 232000 (0.2 m/s < flow velocity <3.0 m/s). Four typical regions can be observed in the Flow Induced Motion responses, including...
This paper investigates performance of seven photovoltaic (PV) array topologies experimentally under cumulative impact of partial shading and deposition of aerosols at different irradiance levels and aerosol types at their different concentration levels. Different array topologies respond differently with regard to their mismatch power loss and fill factor under partial shaded condition. However,...
To provide preferable operating conditions for biomass carbonization, the carbonization properties of maize straw, cotton stalk and poplar wood were investigated in nitrogen atmosphere by segmented heating process at different final temperatures of 300–800 °C for 1 h. Segmented heating carbonization contributes to higher ratio of mass and energy yields than a constant temperature/linear heating process...
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