地源热泵技术及其发展   总被引：4，自引：0，他引：4  

陈洪泳  殷琨  庄迎春 《世界地质》2002,21(2):203-207

地源热泵主要由四个部件组成：即压缩机，冷凝器，膨胀器和调节阀，而地热泵系统的设计主要包括地上和地下系统的设计，地下系统有开放式，封闭式和混合式三种，可根据实际情况来选择；地上系统的设计主要有风机盘管,地板式采暖系统，混合散热系统和中央空调系统的设计。  相似文献   

结构控制新系统MDS的研究     

徐家云  胡泳  钟珞 《地震工程与工程振动》2002,22(5):101-104

文章提出新型控制系统MDS（Mass Damper System），并分别用被动控制和半主动控制方法进行深入研究，结果证实，MDS是一种较好的控制系统。  相似文献   

陕西八卦庙金矿脆－韧性剪切带控矿特征及成矿构造动力学机制   总被引：11，自引：3，他引：11       下载免费PDF全文

冯建忠邵世才  汪东波王学明　马治国 《中国地质》2002,29(1):58-66

八卦庙金矿是秦岭造山带唯一的超大型金矿床,曾被认为是微细浸染型(卡林型)金矿。但最新研究表明该矿床金为粗粒可见金,矿床空间定位和矿体展布受二里河—长沟—八卦庙—空棺沟脆-韧性剪切带控制,矿区内岩石剪切变形特征明显。在脆韧性剪切过程中形成了NW向顺层无根揉皱状含金石英脉,石英脉Ar-Ar坪年龄为(232.58±1.59)Ma,等时线年龄为(222.14±3.45)Ma,是印支期脆-韧性剪切-动力变质分异的产物。这种NW向石英脉含金1×10-6～4×10-6。在燕山早期,剪切带抬升进入浅层叠加了脆性变形,在热液作用下形成了NE向石英脉。NE向石英脉是重要的富矿石,含金4×10-6以上。石英强烈的脆-韧性变形特点记录了两期变形,从早到晚石英位错和差应力具从大到小的演化趋势。韧性剪切和后期脆性变形每一期构造-热液脉动式活动都是从早到晚△σ值降低,在两次脉动式活动的交替时期出现的构造亚稳定期成矿,应力周期形成的“应力泵”或“地震泵”作用是金矿成矿的力学机制。  相似文献   

兰州黄河Ⅱ和Ⅲ级阶地的地层结构、年龄及环境意义   总被引：5，自引：3，他引：2       下载免费PDF全文

王萍  蒋汉朝  袁道阳  刘兴旺 《第四纪研究》2008,28(4):553-563

通过对兰州段黄河Ⅱ和Ⅲ级阶地剖面的地层岩性、粒度分析和光释光测年等,认为剖面中被普遍界定为河漫滩沉积的一套厚几米至几十米具水平层理的细粒砂土层是以冲、洪积与黄土互层的交互式沉积,其开始沉积的时期与气候进入冰期或冰阶相对应。据此可将兰州段黄河阶地剖面地层划分为三部分,即:河流砂砾石层、加积层与风成黄土层,分析了这一地层结构的发育过程,指出沉积相的识别和划分对于阶地研究具有重要意义。  相似文献   

多功能变工况热泵干燥装置的设计分析   总被引：1，自引：0，他引：1  

李敏  关志强  张杰文  刘兰 《广东海洋大学学报》2008,28(6)

设计了可同时实现开式、闭式和半开式干燥介质循环,可在干燥过程中转换工艺、调节工况的热泵干燥装置,以热泵工质R134a为例进行了1匹热泵干燥装置的设计计算,就同一装置在变工况下的性能进行理论分析。结果表明,蒸发温度的提高可有效提高装置的性能及除湿能耗比,冷凝温度的降低可使装置的COP值升高,除湿能耗比下降。  相似文献   

城市地区浅层地温能评价方法探讨   总被引：3，自引：0，他引：3  

韩再生  冉伟彦 《城市地质》2007,2(4):9-15

随着地源热泵技术的成熟,我国城市地区浅层地温能利用正在快速发展,为了保证浅层地温能的有效开发和可持续利用,应对浅层地温能资源进行评价。浅层地温能资源包括浅层地温能可利用量和储存量。浅层地温能利用环境评价和经济评价是资源评价中的必要内容。资源计算成果为城市区域浅层地温能开发利用规划和地源热泵工程提供依据。  相似文献   

地源热泵土壤源换热器的施工技术     

程金明  王巧真 《探矿工程》2007,34(7):25-27

地源热泵（Ground Source Heat Pump，GSHP）作为最有发展潜力的热泵技术在各级政府的积极推窑下发壁迅速，但由于地源换热器施工安装成本高，技术的发展遇到了很大的阻力。探讨了土壤源换热器施工技术和土壤源换热器的热平衡问题，力图提高土源换热器施工技术，降低地源热泵成本，促进该技术的推广应用。  相似文献   

Seasonal variations in pCO₂ and its controlling factors in surface seawater of the northern East China Sea   总被引：2，自引：0，他引：2  

JeongHee Shim  Dongseon Kim  Young Chul Kang  Jae Hak Lee  Sung-Tae Jang  Cheol-Ho Kim 《Continental Shelf Research》2007,27(20):2623-2636

Surface partial pressure of CO₂ (pCO₂), temperature, salinity, nutrients, and chlorophyll a were measured in the East China Sea (ECS; 31°30′–34°00′N to 124°00′–127°30′E) in August 2003 (summer), May 2004 (spring), October 2004 (early fall), and November 2005 (fall). The warm and saline Tsushima Warm Current was observed in the eastern part of the survey area during four cruises, and relatively low salinity waters due to outflow from the Changjiang (Yangtze River) were observed over the western part of the survey area. Surface pCO₂ ranged from 236 to 445 μatm in spring and summer, and from 326 to 517 μatm in fall. Large pCO₂ (values >400 μatm) occurred in the western part of the study area in spring and fall, and in the eastern part in summer. A positive linear correlation existed between surface pCO₂ and temperature in the eastern part of the study area, where the Tsushima Warm Current dominates; this correlation suggests that temperature is the major factor controlling surface pCO₂ distribution in that area. In the western part of the study area, however, the main controlling factor is different and seasonally complex. There is large transport in this region of Changjiang Diluted Water in summer, causing low salinity and low pCO₂ values. The relationship between surface pCO₂ and water stability suggests that the amount of mixing and/or upwelling of CO₂-rich water might be the important process controlling surface pCO₂ levels during spring and fall in this shallow region. Sea–air CO₂ flux, based on the application of a Wanninkhof [1992. Relationship between wind speed and gas exchange over the ocean. Journal of Geophysical Research 97, 7373–7382] formula for gas transfer velocity and a set of monthly averaged satellite wind data, were −5.04±1.59, −2.52±1.81, 1.71±2.87, and 0.39±0.18 mmol m⁻² d⁻¹ in spring, summer, early fall, and fall, respectively, in the northern ECS. The ocean in this study area is therefore a carbon sink in spring and summer, but a weak source or in equilibrium with the atmosphere in fall. If the winter flux value is assumed to have been the mean of autumnal and vernal values, then the northern ECS absorbs about 0.013 Pg C annually. That result suggests that the northern ECS is a net sink for atmospheric CO₂, a result consistent with previous studies.  相似文献   

立式泵固有频率分析及隔振结构研究     

隋富生  宋济平 《海洋技术学报》2000,19(1):61-64

本文应用自行开发的计算机程序,计算了几种立式泵的六个自由度的固有频率,数值计算的结果显示了立式泵的高度及其安装尺寸的变化与其固有频率之间的关系,并分析了不同安装尺寸的隔振效率。最后,为满足立式泵的隔振要求提出了新型的泵体机座设计。  相似文献   

Nozzle Optimization for Water Jet Propulsion with A Positive Displacement Pump     

杨友胜  谢迎春  聂松林 《海洋工程》2014,28(3):409-419

In the water jet propulsion system with a positive displacement (PD) pump, the nozzle, which converts pressure energy into kinetic energy, is one of the key parts exerting great influence on the reactive thrust and the efficiency of the system due to its high working pressure and easily occurring cavitation characteristics. Based on the previous studies of the energy loss and the pressure distribution of different nozzles, a model of water jet reactive thrust, which fully takes the energy loss and the nozzle parameters into consideration, is developed to optimize the nozzle design. Experiments and simulations are carried out to investigate the reactive thrust and the conversion efficiency of cylindrical nozzles, conical nozzles and optimized nozzles. The results show that the optimized nozzles have the largest reactive thrust and the highest energy conversion efficiency under the same inlet conditions. The related methods and conclusions are extended to the study of other applications of the water jet, such as water jet cutting, water mist fire suppression, water injection molding.  相似文献