共查询到18条相似文献,搜索用时 46 毫秒
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热泵循环海水淡化系统 总被引:1,自引:0,他引:1
对现有的热法海水淡化方法进行了节能评述,并提出一种综合了低温多效蒸馏与压汽蒸馏两种海水淡化方法技术优势的新系统,通过对此系统的设计计算,得出结论:本文提出的利用热泵循环的节能海水淡化系统能耗低,在热法海水淡化系统中最为节能。 相似文献
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海水热泵系统设计及技术经济分析 总被引:2,自引:0,他引:2
根据舟山地区的气候条件和海水条件,通过负荷计算、关键技术研究等环节初步设计了某船厂办公楼的海水热泵空调系统,估算了海水热泵空调系统的初投资发现,因为增加了海水取排水设施,所以单个项目经济性较差。但是海水源热泵空调具有非常明显的节能、减排、环保等综合社会效益,在能源日益紧缺、环境破坏严重的今天必将得到广泛应用。 相似文献
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水源热泵是一种高效节能、经济环保、安全稳定、冷暖两用、运行灵活的新型中央空调系统,它利用地表水(江、河、湖水)、地下水、工业废水及生活废水,又可用取之不尽的海水等,借助热泵系统,既能制冷、又能制热,是一种高效建筑节能技术。 相似文献
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This paper presents a study on the utilization of ocean thermal energy in Dalian. Coastal areas are ideal sites for the application of seawater-source heat pump technology (SWHP) to provide district cooling and heating. The technical requirements and the scheme design in the context of marine climate are discussed. A government-commissioned feasibility study of a proposed district energy site in Dalian, with an estimated 68 MW heating load and 76 MW cooling load plant capacity is then described. The economic, energy and environmental impacts are analyzed. In order to get a better understanding of economic justification and benefits of two different systems, annual cost (AC) and net present value (NPV), are used. A series of sensitivity analyses are undertaken to investigate the magnitude of the effect of the parameters variation on cost calculation. The numerical simulations of seawater temperature field are performed by using a two-dimensional convection–diffusion equation model to evaluate environmental impacts. Study indicates that Dalian has great potential for applying SWHP system. It is both technically and economically feasible because of the favorable geographical location and urban environment. 相似文献
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Based on energy conservation equation and Darcy’s law, a model of beach well infiltration intake system applied in a seawater source heat pump system was established. The model consists of the seawater seepage and the heat transfer process. A porous medium model in a software named FLUENT was applied to simulate the seepage and the heat transfer process. This model was also validated by field experiment conducted on the seashore in Tianjin, China. The maximum relative error between simulation results and experimental results was 2.1% (less than 5%), which was acceptable in engineering application. The porosity and coefficient of thermal conductivity of the aquifer soil were determined to be 0.49 W/(m·K) and 1.46 W/(m·K), respectively in the simulation. In addition, the influencing factors of pumping water of beach well were also analyzed. The pumping water was found to increase when the distance between the beach well and the impervious boundary becomes longer, when the distance between the beach well and the supplying water source shortens, when the diameter of the beach well enlarges, and the drawdown enlarges. 相似文献
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文章设计了一种专门用来制备淡水的冷凝器,以及一种间接冷凝换热制备淡水的联合海水淡化太阳能烟囱电站(SCPPSDIC)。以西班牙太阳能烟囱电站的几何参数为基础,对SCPPSDIC系统进行三维建模和数值模拟,并将模拟结果与单一太阳能烟囱电站(SCPP)的模拟结果进行对比分析。研究结果表明:SCPPSDIC的温度场、压力场沿烟囱中轴线呈对称分布,且变化较为平缓;相比于SCPP,SCPPSDIC的输出功率虽有4.2 k W的小幅度下降,但冷凝器区域能够析出3.95 t/h的淡水,淡水产出量极其可观,这使得太阳能综合利用率由1%以下提高到3.43%;冷凝器在制备淡水的同时,所放出的凝结热也会对流入蒸馏池的海水起到预热作用,从而使系统的能量得到充分利用。 相似文献
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A magnesium-solution phase catholyte semi-fuel cell (Mg-SFC) system was investigated as an energetic electrochemical system for low rate, long endurance undersea vehicle applications. This electrochemical system consisted of a magnesium anode and a solution phase catholyte of hydrogen peroxide or hypochlorite, in a seawater electrolyte. Polarization profiles of the Mg-SFC were performed to determine the corresponding voltages at applied current densities ranging from 10 to 50 mA cm−2. Voltages of 1.0 V to 1.8 V were observed at these current densities. Constant current-density tests at 25 mA cm−2 for 60 min were also performed to determine voltage stability with time. These tests showed voltages of 1.3 V when a magnesium anode and an electrocatalyst of nickel foil catalyzed with palladium and iridium were utilized. When an electrocatalyst of planar carbon catalyzed with palladium and iridium was tested, the corresponding voltage was 1.5 V. 相似文献
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The performance of a pilot solar Multi Effect Humidification (MEH) Desalination system in Fuerteventura, Canary Islands, had been measured and analysed in detail by the ZAE Bayern since 1992. The investigated distillation units showed constant performance over several years without extensive maintanance. However the efforts towards further efficiency improvement by economic means pointed out the need of supplementing the system with a thermal storage tank. The distillation unit being the most expensive part of a desalination system has to be run 24 hours a day in order to be economic. A cost estimation for storage implementation yields the result, that cost reduction for the produced water by more than a half is possible. In April 1997 a desalination system with 24 hour thermal storage was built up in Sfax / Tunisia. The results of a short term measuring campaign at this site are presented here.For optimizing the ratio of sizes of thermal storage, collector field and distillation module a simulation tool for collector field and storage is developed at the ZAE Bayern. The simulation results of a combined laboratory distillation unit and storage system are presented. 相似文献
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《International Journal of Hydrogen Energy》2023,48(26):9592-9608
Population growth and the expansion of industries have increased energy demand and the use of fossil fuels as an energy source, resulting in release of greenhouse gases (GHG) and increased air pollution. Countries are therefore looking for alternatives to fossil fuels for energy generation. Using hydrogen as an energy carrier is one of the most promising alternatives to replace fossil fuels in electricity generation. It is therefore essential to know how hydrogen is produced. Hydrogen can be produced by splitting the water molecules in an electrolyser, using the abondand water resources, which are covering around ? of the Earth's surface. Electrolysers, however, require high-quality water, with conductivity in the range of 0.1–1 μS/cm. In January 2018, there were 184 offshore oil and gas rigs in the North Sea which may be excellent sites for hydrogen production from seawater. The hydrogen production process reported in this paper is based on a proton exchange membrane (PEM) electrolyser with an input flow rate of 300 L/h. A financially optimal system for producing demineralized water from seawater, with conductivity in the range of 0.1–1 μS/cm as the input for electrolyser, by WAVE (Water Application Value Engine) design software was studied. The costs of producing hydrogen using the optimised system was calculated to be US$3.51/kg H2. The best option for low-cost power generation, using renewable resources such as photovoltaic (PV) devices, wind turbines, as well as electricity from the grid was assessed, considering the location of the case considered. All calculations were based on assumption of existing cable from the grid to the offshore, meaning that the cost of cables and distribution infrastructure were not considered. Models were created using HOMER Pro (Hybrid Optimisation of Multiple Energy Resources) software to optimise the microgrids and the distributed energy resources, under the assumption of a nominal discount rate, inflation rate, project lifetime, and CO2 tax in Norway. Eight different scenarios were examined using HOMER Pro, and the main findings being as follows:The cost of producing water with quality required by the electrolyser is low, compared with the cost of electricity for operation of the electrolyser, and therefore has little effect on the total cost of hydrogen production (less than 1%).The optimal solution was shown to be electricity from the grid, which has the lowest levelised cost of energy (LCOE) of the options considered. The hydrogen production cost using electricity from the grid was about US$ 5/kg H2.Grid based electricity resulted in the lowest hydrogen production cost, even when costs for CO2 emissions in Norway, that will start to apply in 2025 was considered, being approximately US$7.7/kg H2.From economical point of view, wind energy was found to be a more economical than solar. 相似文献