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真空隔热板(VIP)作为一种新的保温,隔热材料日益受到人们的关注,其低导热系数是现在冰箱保温材料(PU)的1/4左右.VIP板生产技术目前已非常成熟,生产厂家可以生产顾客所需要的各种形状的产品,而且随着大规模的生产,其价格将会有很大程度的降低,这就为VIP板在冰箱上的应用提供了可能.本文介绍了VIP板在冰箱上的应用研究,研究结果表明,在普通冰箱上应用VIP板的节能效果能达到10%~20%左右. 相似文献
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本文以某型号冰箱为例,通过CAE仿真冰箱箱体的保温性能和箱内的开停机状态,并对比分析冰箱加装不同厚度真空绝热板(VIP)时的冰箱性能参数。结果表明CAE软件能够准确预估冰箱性能参数。与原模型相比,泡层内分别加装10mm、20mm厚VIP时,冰箱的漏冷量分别降低11.2%和9.7%(停机)、16.0%和13.7%(开机),压缩机的开机率为35.1%(无VIP),27.4%(10mmVIP)和23.3%(20mmVIP),能耗分别为0.316kW·h/24h(无VIP),0.268kW·h/24h(10mmVIP)和0.245kW·h/24h(20mmVIP)。通过对冰箱性能参数的仿真研究,为冰箱性能设计提供了先进的方法,并为VIP应用于冰箱能耗改善提供了强有力的设计工具。 相似文献
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真空隔热板(VIP)作为一种新的保温、隔热材料日益受到人们的关注。其低导热系数是现在冰箱保温材料(PU)的1/4左右。VIP板生产技术目前已非常成熟,生产厂家可以生产顾客所需要的各种形状的产品,而且随着大规模的生产,其价格将会有很大程度的降低.这就为VIP板在冰箱上的应用提供了可能。本文介绍了VIP板在冰箱上的应用研究,研究结果表明.在普通冰箱上应用VIP板的节能效果能达到10%~20%左右。 相似文献
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This work presents a method for the selection, typification and clustering of load curves (STCL) capable of recognizing consumption patterns in the electricity sector. The algorithm comprises four steps that extract essential features from the load curve of residential users with an emphasis on their seasonal and temporal profile, among others. The method was successfully implemented and tested in the context of an energy efficiency program carried out by the Energy Company of Maranhão (Brazil). This program involved the replacement of refrigerators in low-income consumers’ homes in several towns located within the state of Maranhão (Brazil). The results were compared with a well known time series clustering method already established in the literature, Fuzzy CMeans (FCM). The results reveal the viability of the STCL method in recognizing patterns and in generating conclusions coherent with the reality of the electricity sector. The proposed method is also useful to support decision-making at management level. 相似文献
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为了获取对燃气分布式能源能效、经济、环保影响较大的参数,进而指导项目的建设与运行,建立燃气分布式能源系统在热力性能、工程经济性、环保性能方面的能效计算与敏感性分析模型。以某国际机场燃气分布式能源为例,对其进行能效分析与敏感性分析,分析结果表明,提高发电效率、制冷系统COP(制冷系数),有利于一次能源节约率的大幅提高; 天然气价和冷价对系统经济性的影响较大,在燃气分布式能源项目的设计应用中需充分考虑; NOx和SO2对减排量收入的影响非常突出,CO2对环境影响方面更为突出。 相似文献
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This work presents a new method for the clustering and pattern recognition of multivariate time series (CPT-M) based on multivariate statistics. The algorithm comprises four steps that extract essential features of multivariate time series of residential users with emphasis on seasonal and temporal profile, among others. The method was successfully implemented and tested in the context of an energy efficiency program carried out by the Electric Company of Alagoas (Brazil) that considers, among others, the analysis of the impact of replacing refrigerators in low-income consumers’ homes in several towns located within the state of Alagoas (Brazil). The results were compared with a well-known method of time series clustering already established in the literature, the Fuzzy C-Means (FCM). Unlike C-means models of clustering, the CPT-M method is also capable to obtain directly the number of clusters. The analysis confirmed that the CPT-M method was capable to identify a greater diversity of patterns, showing the potential of this method in better recognition of consumption patterns considering simultaneously the effect of other variables in additional to load curves. This represents an important aspect to the process of decision making in the energy distribution sector. 相似文献
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为降低储热介质成本,基于以矿物油储热的绝热压缩空气储能系统(A-CAES),增设供热压缩机以降低储热温度,进而提出以水为储热介质的新型热电冷联产的压缩空气储能系统。建立改造后的系统模型,采用热力学方法对设计工况下两系统进行了计算,比较了供热压比(2.4~3.8)与换热器效能(0.6~0.9)变化时热电冷联产系统的性能参数。结果表明,热电冷联产系统的储热温度大幅降低,实现了储热介质的改变;与原系统相比,热电冷联产系统电耗率基本不变,热效率、效率分别提高约14%、2.6%;供热压比变化对系统性能及设备损影响较小,换热器效能变化对系统效率、损有显著影响。 相似文献
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《Potentials, IEEE》2008,27(5):37-39
Electronic-based refrigerators constitute one class of electrical elements that often work based on the principles of thermoelectric effects. These devices, which are much quieter than their compressorbased counterparts, are gradually gaining more popularity and are sometimes considered replacement candidates for today's compressor-based refrigerators. Over the past few decades, several books and numerous articles have been published on the properties of electronic-based refrigerators and these efforts are still ongoing. Today, several research groups around the globe are investigating the properties of thermoelectric effects and are trying to develop a high-efficiency refrigerator based on these effects. We will discuss the possibility of building an electronic refrigerator based on the properties of noise by introducing a noise-based refrigerator suitable for integrated circuits. We will then focus on the implementation and the efficiency of such a device. Although the efficiency of such a device is too low to be practically useful, this discussion is educational and helps to gain a better understanding of noise in electronic devices. 相似文献
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风光互补的压缩空气储能与发电一体化系统特性分析 总被引:3,自引:0,他引:3
提出一种新型的风光互补的储能与发电一体化系统,该系统互补利用风能与太阳能,并通过压缩空气储能系统改善其不稳定性与间歇性,实现储能与发电等多功能集成;基于热效率、火用效率及储能效率3种评价准则,全面分析系统的热力特性和储能特性,揭示透平进口压力和初温、压气机和透平效率对系统性能的影响规律;分析比较了系统采用等容储气罐和等压储气罐对性能的影响,指出利用等压储气罐能有效提高系统热力性能和储能性能。研究结果为可再生能源的规模化发展以及大规模储能的发展提供了参考。 相似文献
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单能 X 射线标定装置是基于布拉格衍射原理产生单能 X 射线的装置,能量连续可调的单能 X 射线可以为探测器提供
能量可选的详细标定实验。 使用蒙特卡洛计算软件对两个不同型号的硅漂移探测器的探测效率进行模拟计算,得到 3 ~ 50 keV
能量段的探测效率,在单能 X 射线标定装置上完成了硅漂移探测器探测效率的标定实验,得到实验测量的探测效率曲线,并与
模拟效率曲 线 对 比。 其 中, PNDetector 公 司 的 MLC 型 硅 漂 移 探 测 器 的 实 验 结 果 与 理 论 计 算 结 果 的 误 差 最 大 值 为
4. 23%@ 15 keV,KETEX 公司的 BEV 133 型硅漂移探测器的实验结果与理论计算结果的最大误差为-6. 88%@ 12 keV。 结果表
明,在 7~ 16 keV 能量段,两个探测器的实验标定结果与理论计算结果相符,在 8 keV 左右,实际探测效率大于 90%。 研究成果
验证了使用基于布拉格晶体衍射原理的单能 X 射线用于探测器标定的优越性,为国产化 X 射线探测器提供可靠的性能研究与
测试平台。 相似文献
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某200 k W微燃机冷热电三联供系统按季节负荷特点分为热电联供和冷电联供2种模式,基于Ebsilon软件对该系统构建模型并进行仿真模拟及性能分析,分别计算出不同工况下冷热电三联供系统的一次能源利用率和效率。结果表明:冷电联供时,环境温度从24℃变化到38℃,系统一次能源利用率为65.2%~68%;热电联供时,环境温度从-10℃变化到24℃,系统一次能源利用率为66.4%~74.2%。系统冷电联供(取环境温度为32℃)运行时,效率为31.1%,损失之和为451.92 kW,当微燃机负荷率在30%~100%变化,系统一次能源利用率为60.3%~66.9%;系统热电联供(取环境温度为0℃)运行时,效率为38.5%,损失之和为408.4 kW,当微燃机负荷率在30%~100%变化,系统一次能源利用率为54.4%~68.5%。通过搭建的微燃机三联供系统模型对实际运行数据进行分析,结果认为:实际运行工况主要存在冷负荷较小的问题,通过蓄冷罐蓄存多余冷量,系统的一次能源利用率可提高13.8%。 相似文献
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为提高生物燃料电池(MFC)的输出功率和有机物的降解效率,实验以KMnO4为阴极电子受体,泡沫金属为阳极.葡萄糖模拟废水为基质,设计了新型双室生物燃料电池,考察了KMnO4浓度、pH值对MFC产电性能的影响.结果表明,KMnO4浓度为500 mg/L时,MFC的最大开路电压可达1.68 V,最大输出比功率为8 657 mW/m3,电池的内阻为232 Ω.同时化学需氧量(COD)去除率为87.1%,库仑效率为45.2%.阴极液的pH值对电池的产电性能有显著影响,酸性溶液条件下有利于改善电池的性能.本研究设计的MFC可有效地降解有机物回收电能,同时提高了电池的产电能力,具有显著的经济、环境效益和应用前景. 相似文献