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A Novel low temperature district heating and cooling system with auxiliary heat storage pipe system is proposed for reflecting new features of bi-lateral energy trades effectively in emerging energy prosumer based new energy business platform. The newly proposed district heating and cooling system can provide more favorable operating conditions to implement bi-lateral heat trades system between the...
An effective and compact thermal management system is essential for modern lithium-ion (Li-ion) battery powered vehicles, which involve rigorous constraints on weight and volume. In this paper, a phase change material (PCM) based battery internal cooling system is proposed by replacing the hollow mandrel in cylindrical battery with a PCM-filled mandrel, and it is tested on a fabricated steel cell...
Li-ion batteries are the state-of-the-art power sources for portable electronics, electric vehicles, and aerospace applications. The safety issues regarding Li-ion batteries arouse particular attentions after several accidents reported in recent years. Among various abuse conditions, nail penetration is one of the most dangerous for Li-ion batteries due to the accumulated heat generation, which could...
An effective optimization method is presented for the shape design of the axis-symmetric wind lens aiming at velocity augmentation and drag force reduction. The profile of the wind lens is approximated by a polynomial function. Velocity and drag force are calculated by CFD (Computational Fluid Dynamics) method. The wind lens profile is optimized adopting GA (genetic algorithm). GA and CFD method are...
Coalbed methane is an economic and sustainable alternative fuel for spark ignition engines. In a constant volume combustion bomb, an experimental study was conducted about laminar and turbulent burning characteristics of the premixed coalbed methane/air flames. The turbulent burning velocities of coalbed methane-air mixtures were obtained as well as unstretched laminar burning velocities and Markstein...
An appropriate operating temperature range is critical for the overall performance and safety of lithium-ion batteries. Considering the excellent performance of water in heat dissipation in industrial applications, in this paper, a water based PAAS (sodium polyacrylate) hydrogel thermal management system has been proposed to handle the heat surge during the operation of a Li-ion battery pack. A thermal...
With the rapid development of EVs (electric vehicles), the integration of PV (photovoltaic) generation with EV charging infrastructure can effectively improve the efficiency of clean energy utilization and carbon emission reduction. How to optimize the capacities of components in the PV-based BSS (battery switch stations) is still unsettled. This paper focuses on the mathematical model of the problem...
Exergy analysis is a powerful tool for determining the efficiency of processes that influence system performance. Thus, the exergy of dual-stage NF (nanofiltration) seawater desalination was analyzed. Three different processes were simulated by Dow's Reverse Osmosis System Analysis, and the exergies were compared. The results indicated that the main exergy destruction in the conventional process occurred...
Energy and freshwater shortage are the bottlenecks restricting China's economic development. The integration of energy utilization system and seawater desalination is considered as an innovative technology enabling efficient simultaneous use of middle or low temperature thermal energy and supply freshwater. Three feasible approaches to integrate seawater desalination with energy utilization system...
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