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The energy efficiency monitoring is an essential precondition for ground source heat pump system’s controlling and energy saving operation. Based on the data monitoring applied in the school building, this work is focused on the parameters acquisition and operation analysis of the GSHP system in Tangshan. Results show the average COPs(coefficient of performance) are2.85 and 2.70 in summer and winter, respectively, and heat(cold) unbalance underground existed after whole year operation. The analysis of data also indicates that the direct borehole air-conditioning saved some power consumption obviously in the early stage of summer and energy saving of the GSHP system depended remarkably on its operation and management level. Besides the observation points of ground temperature are laid for a large-scale GSHP system, and the hydraulic balance of the pipes group needs to be concerned specially in safeguarding better reliability. 相似文献
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以中高温地热作为驱动热源,将有机朗肯循环与蒸汽压缩制冷循环相结合,提出了中高温地热冷热电联产系统.基于热力学第一和第二定律,构建了冷热电联产热力学优化模型,并对热源温度120~200℃范围内的系统性能进行了模拟计算和分析,比较了Cyclohexane、Pentane、n-Heptane、n-Octane、n-Nonan... 相似文献
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针对高速公路服务区的热湿环境特征,以某高速公路上的服务区为研究对象,采用问卷调查和现场测试相结合的方法,对服务区内的热湿环境进行研究,讨论了不同环境参数对人体热舒适的影响,同时采用动态热舒适评价指标:相对热指标(Relative Warmth Index,RWI)和热损失率(Heat Deficit Rate,HDR),对冬季服务区公共区域过渡状态下的热舒适环境进行分析,得出过渡状态下的人体热舒适变化情况。调查结果显示,参与调查的人员整体表示对室内热湿环境接受,同时测量结果表明,服务区超市内空气平均温度为17.4℃,平均相对湿度为32.8%,室内平均空气流速为0.16 m/s,均处于人体可接受范围内。研究表明,采用动态评价指标与问卷调查相结合的方法能够准确评价冬季高速公路服务区热环境;寒冷季节,服务区室内空调温度不宜设置过高,避免因环境突变造成人体不舒适。 相似文献
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随着COVID-19病毒的爆发,舒适、健康的室内环境成为了新的研究焦点.针对传统供暖模式所展示出的缺陷,本研究提出了1种新型的低温地板辐射与低温层式通风耦合供暖模式,并对其热性能、室内热舒适性以及污染物代谢能力进行了对比实验研究.研究结果表明:在相同能耗下,本研究所提出的新型耦合供暖模式相对于其他2种常规采暖模式下的操作温度分别高出0.78℃与0.88℃;室内PMV垂直分布更加均匀,且头足敏感区舒适性强于常规供暖模式;二氧化碳去除效率可高达2.08,大大缩短污染物停留时间,降低人体暴露率.因此本研究所提出的低温地板辐射与低温层式通风耦合供暖模式可以在高浓度室外环境下提供1个舒适、健康的室内环境,具有较大的供暖节能潜力与应用前景. 相似文献
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PROFIBUS-DPV1智能从站的研制 总被引:1,自引:1,他引:1
开发PROFIBUS产品成为国内自动化仪表开发的热点,但其开发的难度很大,需选择合适的方案。通过PROFIBUS总线系统应用的经验,对开发数据传输率达12M bit/s的PROFIBUS智能从站的过程进行了阐述。 相似文献
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The adsorption of rare earths,lanthanum,cerium,neodymium,and yttri um by di(2-ethylhexyl) phosphoric acid(D2EHPA) resin in the presence of a compl exing agent,EDTA,was investigated. Flow injection was selected as the injectin g method. Various parameters,sample pH,sample loading time,sample flow rate,EDTA concentration,EDTA flow rate,eluent concentration,and eluent flow rate,were studied and optimized. Under the optimum conditions,the method allowed the determination of rare earths with detection limits of 1.09 μg/L(lanthanum),3 .31 μg/L(cerium),2.05 μg/L(neodymium),and 1.25 μg/L(yttrium) . High repea tabilities were obtained for all the four rare earths(RSD<5%) . The proposed met hod was applied to the determination of the rare earths in water samples with a recovery range of 95.8%-103.3%. 相似文献