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广州地区土壤温度场对U型埋管换热性能的影响 总被引:1,自引:0,他引:1
针对广州地下50m以内土壤温度分布来研究广州地区地温的分布特性和变化规律,建立了垂直u型地埋管地下换热区域温度场的三维稳态和瞬态传热模型.同时就该系统在冬季和夏季运行分析了不同工况下埋管区域土壤温度场的分布情况以及进一步确定了热泵机组连续和间歇运行对地埋管换热性能、埋管区地温恢复状况的影响.最后,通过对某别墅工程的动态负荷计算,选用ASHRAE推荐的地埋管地源热泵设计模拟软件GLHEPRO 3.0进行30a运行模拟,分析得到了地下埋管区域土壤热平衡对埋管换热性能的影响程度,从而为华南地区推广使用地埋管地源热泵系统的长期高效运行提供理论参考. 相似文献
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在北方地区,由于建筑物的冬季热负荷大于夏季冷负荷,单独采用地源热泵对建筑物供暖、制冷,长期运行会造成土壤的温度逐年下降,最终导致地源热泵机组COP越来越低,严重时会影响机组的正常运行。夏季采用太阳能对土壤补热,解决地源热泵机组单独运行时冷热不平衡问题,有效提高机组热效率,达到综合节能的目的。通过对太阳能-地源热泵复合空调系统进行分析研究,利用TRNSYS软件进行分析模拟,从而得出太阳能-地源热泵空调系统的最佳匹配方案。 相似文献
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本文介绍了热管的基本原理,对锅炉烟气余热回收系统进行了设计与实施,对余热理论回收效果进行了分析并与实际效果进行了对比。结果表明:热管换热器在锅炉烟气余热综合回收利用效果好,降低了燃料消耗,具有较好的经济效益与环保效益。 相似文献
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提出了燃气空调的技术方案,叙述了每种方案的组成、工作原理和特点。通过对电力、燃气制冷供暖应用的分析,指出使用燃气空调在解决电力、燃气峰谷负荷,保护环境、节约能源、提高一次能源利用率等方面都有着显著的优点。对燃气空调系统的初投资、运行费用、绿色环保等进行了技术经济分析,并给出了详细的分析结果。指出燃气空调有着美好的发展前景。 相似文献
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A novel micro CCHP system, which is based on a two bed silica gel–water adsorption chiller, is constructed in this work. To reveal the chiller characteristic in this system, a transient model of the adsorption chiller is developed. According to the comparison of the simulated results and experimental data, the presented model shows a good performance in predicting the chiller performance, with both stable and variable heat source temperature. With the analysis of simulated results, it is found that the cooling capacity and the coefficient of performance (COP) of the chiller are influenced significantly by the average value and variation rate of electric load, as well as the average value of cooling load. The water tank also shows a great effect on the chiller performance. To get better performance of the chiller, the water tank should be adopted when the electric load is low or its variation rate is positive, and should not be utilized when the electric load is high or its variation rate is negative. A 500 L water tank is recommended in order to get better performance and acceptable start-up time. Furthermore, to get better performance as well as higher security, a cold accumulator should be adopted. 相似文献
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分析山东青岛某办公建筑采暖工程改造情况,对改造前与改造后的系统进行技术与经济性评估。利用DeST软件对采暖期的逐时热负荷进行模拟计算,并提出四套供暖方案,以七天为一个运行周期,记录机组运行工况,计算其初投资与运行年费,从不同角度分析对比。研究表明:采用空气源热泵方案的运行年费相较于传统集中供热有明显优势,虽然初投资较高,但在6.71 a内可实现动态投资回收。当空气源热泵系统采暖方案中热源为可选择性多热源时,运行年费进一步降低,弱化了燃料价格等敏感性因素波动的影响力,证明项目的技术路线是可行的。 相似文献
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针对武汉嘉叶宾馆空调扩建工程,文章对螺杆式冷水机组加燃油锅炉,螺杆式冷水机组加蓄热式电热锅炉,直燃型溴化锂吸收式冷温水机组3种类型的冷热源方案进行了技术、经济性分析,作者认为,螺杆式冷水机组加燃油锅炉方案最合适。 相似文献
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应用热泵型原油加热系统回收高温污水余热 总被引:2,自引:0,他引:2
介绍了热泵型原油加热系统的工艺流程及配套工艺。并通过理论计算验证了应用热泵型原油加热系统回收油田高温污水余热资源的可行性。实际运行表明,该系统原油总吸热功率为1014.4kW。效益估算结果表明,该系统年效益约为613.55万元。最后分析了实际运行值与设计值产生差距的原因。 相似文献
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An experiment was conducted to obtain heat transfer data in liquid–solid circulating fluidized beds. In the experiment, two kinds of risers were provided, their inner diameter being 24 mm and 12 mm, respectively. Tested particles were of glass and ceramics, having a diameter range from 2.10 to 4.95 mm. Water at ambient conditions was used as the fluidizing liquid. The experimental data showed a trend where the heat transfer coefficient increases gradually with increasing liquid velocity approaching that for a liquid single‐phase flow (“heat transfer enhanced region”), and finally coincides with that for a liquid single‐phase flow (“liquid single‐phase heat transfer region”). The heat transfer coefficient in the heat transfer enhanced region was found to be a function of the slip velocity between liquid and particles. Based on the experimental data, a correlation was proposed for predicting the heat transfer coefficient in the entire region from the heat transfer enhanced region to the liquid single‐phase heat transfer region, which could reproduce the experimental data with an accuracy of ±15%. The proposed correlation agreed well with existing data. © 2008 Wiley Periodicals, Inc. Heat Trans Asian Res, 37(3): 127–137, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20200 相似文献
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