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The continuous- and batch-types chemical looping air separation (CLAS) processes are developed by using Aspen Plus® software. Through the heat integration of CLAS systems and oxy-fuel combustion of methane (OCM), new continuous- and batch-types of stand-alone electricity/oxygen production systems are denoted as Designs 1 and 2, respectively. The redox performances of both CLAS processes regarding...
Condensation heat of air-conditioner in household and public is a kind of indispensable waste heat, which is necessary to recover and reuse it. Herein, phase change material is widely used in exhaust heat recover and storage. In the present work, expanded graphite(EG) was introduced to stearic acid-acetamide(SA-AC) eutectic mixture, aiming at obtaining composite phase change material(CPCM) with high...
Battery energy storage (BES) plays an important role in the integration of intermittent renewable power and distributed generation. The price arbitrage is a major source of energy storage income. In China, the electricity price is tightly regulated by the government. It's interesting to find out whether the BES is economic viability in such a special electricity market, and what's the optimal response...
Highly concentrated photovoltaic (HCPV) module exhaust heat recycle system incorporated with adsorption air-conditioning (AAC) module and PCM, along with providing domestic hot water was designed and discussed. In light of the different grade of thermal energy, several operating modes were analyzed in this system. Besides, an appropriate composite phase change material (CPCM) was obtained to store...
Heat supply systems based on absorption heat pump were assessed to have great potentials on energy savings and emissions reduction. A prototype of NH3-H2O water source absorption heat pump (WSAHP) designed for low temperature heating was experimentally investigated under different working conditions. The effects of driving source, hot water and source fluid temperature on the heating performance were...
A hydraulic hybrid vehicle with the self-adaptive system is proposed. The mode-switching between the driving mode and the hydraulic regenerative braking mode is realised by the pressure cross-feedback control. Extensive simulated and tested results are presented. The control parameters are reduced and the energy efficiency can be increased by the self-adaptive system. The mode-switching response is...
A wastewater treatment process is developed as a heat-integrated fuel processor to produce hydrogen. If the hydrogen flow is directly connected to the PEMFC (proton exchange membrane fuel cell), then a stand-alone PV/FC/battery hybrid power system is developed to meet the daily load demand. According to the prescribed scenarios such as wastewater conditions and weather patterns, the reliability of...
This work describes three different configurations of syngas production processes using a combination of SMR (steam methane reforming) and DRM (dry reforming of methane). The ideal SMR + DRM process ensures the maximum product yield, the heat-integrated SMR + DRM process fulfills the maximum heat recovery, and the stand-alone SMR + DRM process effectively suppress net CO2 (carbon dioxide) emissions...
The hybrid method is effective for energy savings. This paper presents an energy efficient hydraulic hybrid propulsion system for automobiles. The system consists of hydraulic common pressure rail, hydraulic transformer and hydraulic pump or motor. The parameter design and propulsion characteristics of the hydraulic hybrid propulsion system were investigated. The simulated and tested results were...
Thermal behavior of biomass in torrefaction plays an important role in the operation of pretreatment. To understand the endothermic and/or exothermic characteristics of biomass in the course of torrefaction, an experimental system is conducted and two kinds of biomass (oil palm fiber and eucalyptus) are investigated. The results indicate that the thermal behavior is significantly influenced by the...
Oil and related products continue to be prime enablers of the maintenance and growth of nearly all of the world's economies. The dramatic increase in the price of oil through mid-2008, along with the coincident (and possibly resultant) global recession, highlight our continued vulnerability to future limitations in the supply of cheap oil. The very large differences between the various estimates of...
The growing concern over environmental considerations and the increasing fuel cost call for operating the energy station in a more economical and environmentally friendly way. This paper develops a multi-objective model for the CHPED (combined heat and power economic dispatch) problem to conventional energy stations, where the competing fuel cost and environmental impact objectives are simultaneously...
This paper presents the measured characteristics of a single piston hydraulic free-piston engine prototype. The detailed results about the piston motion and the fuel combustion are presented. The results show that there is a strong interaction between the piston motion and the fuel combustion in the free-piston engine. The gas force plays a leading role in the innate asymmetric piston motion around...
This paper investigates the three-dimensional turbulent flow in a chimney used for venting flue gas from either a boiler or stove. The thermoelectric generator (TEG) modules are embedded in the chimney walls. To understand the power output performance of the TEG module, three-dimensional numerical simulations combining convection and radiation effects, including the chimney tunnel, TEG modules, plate-fin...
This paper describes the design of a single piston compression ignition hydraulic free-piston engine. An engine simulation model considering hydraulic valve dynamics is built. Extensive simulated results are presented and the major features of the engine are discussed. Experimental results from a full-cycle test of a prototype are also included and analysed integrated with simulation as well. The...
Due to the critical importance of oil to modern economic activity, and oil’s non-renewable nature, it is extremely important to try to estimate possible trajectories of future oil production while accounting for uncertainties in resource estimates and demand growth, and other factors that might limit production. In this study, we develop several alternate future scenarios for conventional oil supply,...
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