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以烟台某办公大楼为例,详细介绍了冷却塔供冷系统设计.重点分析了内区房间室温的选择、最高冷水温度的计算、负荷侧和冷源侧系统设备配置的比较、冷却塔运行时间的计算,以及7个可行性方案的节能性与经济性比较.合理选择了冷却塔供冷系统的切换温度、供冷时间、运行水温,以充分利用冷却塔的冷却功能制冷. 相似文献
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以广州大学城某高校采用区域供冷的典型教室为研究对象,测试了教室内的空气温度和相对湿度,研究了空气状态参数受外界因素影响的变化规律,结果表明:有空调教室热湿环境与无空调教室相比有很大的优越性;部分教室的温、湿度场不均匀,送风口下方一定区域内温度较高;各教室的温、湿度值差别较大,部分顶层大教室的热舒适性不理想;开门窗不仅延长温度和相对湿度达到稳定的时间,而且对室内热湿环境造成较大影响。 相似文献
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充分了解辐射供冷系统的传热特性有助于该系统的设计、推广及应用。构建了埋管式辐射地板的三维稳态传热模型,进行供冷工况下地板内部传热情况的数值模拟,得到了辐射地板内部及表面的温度场。经实验验证,建立的传热模型与实际误差小于9.01%。模拟分析了换热盘管长度与供水温度对辐射地板的供回水温差、供冷能力及温度分布的影响。结果表明:在相同供水温度下,换热盘管越长,埋管式辐射地板的供冷能力越弱,温度分布均匀性越差,管长每增加10 m,单位面积辐射地板供冷量约降低1.5 W/m2;在相同换热盘管长度下,供水温度越高,地板的供冷能力越弱,温度分布均匀性越好。 相似文献
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对室内空调末端供热能力进行研究,得出空调在不同条件下的冷热源选型依据,避免出现室内空调供热富余或不足的情况。论文对室内空调末端供热能力现有资料进行解读,应用实例研究法,选取室内空调风机盘管为例展开针对性分析。搭建了物理模型,用于分析变流量与定流量工况下的室内空调末端供热能力,结合传热系数等要素,得出空调在不同工况下的室内热负荷。分析可知,在30~45℃水温范围内,空调末端在定流量工况与变流量工况下的最大冷热负荷区间分别为32%~89%和15%~88%。 相似文献
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利用计算流体动力学方法,通过PHOENICS分别对辐射地板与置换通风(DV),层式通风(SV)和混合通风(MV)相结合的复合系统进行模拟分析.得出不同地板温度,送风方式以及送风参数的室内速度和温度分布.结果 表明在不考虑室内污染物的情况下,通过改变送风温度,速度以及地板温度时,置换通风中由垂直温差引起的竖直不满意率略高... 相似文献
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辐射冷顶板供冷量与表面温度的模拟分析 总被引:1,自引:0,他引:1
以冷顶板的传热单元为研究对象,建立了冷顶板室内传热过程的数学模型,分析了管板布局、室外空气计算参数、室内空气设计参数、房间外墙数和窗墙面积比、冷冻水量以及水温对冷顶板供冷能力以及表面温度均匀性的影响,得到了提高辐射板供冷量的途径。 相似文献
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针对传统破坏水温分层技术的高能耗、低效率等问题,研制了能模拟基于自然对流而形成水温分层的中试模型水库,研究了曝气诱导形成内波的可行性,分析了内波破坏水温分层的过程和效率。结果表明,曝气器的出口位置影响内波的形成,当其位于等温层顶部,在曝气量为100 L/h左右时,能形成较为规则的内波;内波周期与气弹形成周期基本一致,内波波长和波高较大。内波破坏水体分层的过程表现为变温层的逐步下潜,内波破坏水体分层的效果较为均匀。当曝气量分别为50、100、150、200 L/h时,内波破坏分层所需时间分别为5、2.5、2、1 h;当不能形成内波时,对应时间分别约延长3.5、1.5、1.5、1.5 h。 相似文献
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The main thrust of this research was to develop a simplified cooling capacity estimation model for a suspended (free-hanging type) metal ceiling radiant cooling panel. By statistically analyzing panel performance data generated by a validated analytical panel model, the impact of various design parameters and their combinations on the panel cooling capacity was estimated. And then a linear regression equation was derived as a function of major design parameters and interactions which have significant effects on the panel capacity. In this analysis, eight single parameters and 13 two-factor interactions showed significant impact on the panel cooling capacity. Consequently, a simplified regression model for a free hanging panel was derived as a function of those selected parameters. The proposed model could estimate the panel cooling capacity not only for the natural convection but also for the mixed convection condition present in a mechanically ventilated space. 相似文献
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The weather in Baghdad, Iraq is hot dry in the summer while water is plentiful and cheap. These are conditions which encourage the use of evaporative cooling. A building with one space in it was used to test the effect of a roof pond which was ventilated mechanically for summer cooling. Thermal measurements were taken for the room in normal conditions without a pond, with a lone pond and no mechanical ventilation, and then finally with mechanically forced ventilation. The results showed a marked improvement in the space temperature with a significant reduction during the peak time outside temperatures at 3 O’clock reaching 6.0 °C between the room without the pond and with a ventilated one and 6.5° at 18:00 during peak inside temperatures. The study also showed that improvements would be better in real-life conditions where exterior wall area is less than the test room. 相似文献
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在常用冷却塔计算方法的基础上,建立了适合空调用冷却塔出水温度的计算方法,并编写计算程序对不同状态下的空调用冷却水温度进行了计算,计算结果可以作为空调机组效率分析的基础。 相似文献
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为研究高温喷水冷却后钢筋再生混凝土(卵石类)梁的力学性能,以温度、取代率、冷却方式和剪跨比为变化参数,对28个试件进行高温喷水冷却后的静载试验。观察试件的表观变化、受力破坏形态,获取其荷载 挠度曲线及力学性能指标。基于试验实测数据,深入分析各变化参数对试件力学性能的影响,并探讨其承载力的计算方法。研究结果表明:高温喷水冷却后,试件发生破损,受力破坏形态表现为弯曲破坏和斜压破坏,钢筋再生混凝土梁比普通钢筋混凝土梁具有更好的力学性能;随着温度的升高,承载力先增大后减小,而延性和耗能能力逐渐变差;随着取代率的提高,承载力、延性和耗能能力具有小幅增大的趋势,增幅在10%以内;冷却方式对承载力影响显著,而对延性和耗能能力无明显影响;剪跨比越小,承载力越大,但延性和耗能能力越差;最后,建议采用修正后的欧洲规范计算高温喷水冷却后钢筋再生混凝土梁的承载力。 相似文献
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冷却塔的冷却水温对军团病菌和设备费用的影响 总被引:6,自引:2,他引:4
概略介绍了空调系统使用冷却塔引起民的军团病菌污染。通过投资效益分析方法,说明确定合理的冷却塔水温运行范围可以实现减少军团病危险的环境效益和冷却塔费用的经济效益。 相似文献
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A mathematical model has been developed to predict radiocaesium concentrations over time within individual compartments of the lake and its catchment. The lake has been divided into five compartments; catchment, lake water (epilimnion and hypolimnion during stratification), lake sediment and fish. Radiocaesium enters the lake via contaminated rainfall and catchment runoff. A proportion of this radiocaesium absorbs onto suspended solids in the lake. This proportion is represented by a distribution coefficient. Sedimentation of the suspended solids occurs at a rate defined by the areal removal coefficient and results in increased caesium concentrations in the sediment. The ingestion of radiocaesium by either water column or benthic feeding fish is described by transfer functions. The model has been tested against data collected from Esthwaite water and Windermere shortly after the Chernobyl reactor accident from May 1986 to December 1987. The model simulates observed radiocaesium concentrations in Esthwaite lake water and sediment and also in lake water, sediment and fish in Windermere. The model could form the basis of a valuable management tool for the water industry should a major airborne pollution event occur again. 相似文献