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以杭州某办公楼为例,提出了建筑内区在过渡季和冬季利用新风供冷和冷却塔供冷2种方案,对二者进行了技术要点分析和综合比对。对于新风供冷方案,分析了室内温度、新风温度、新风比之间的关联及供冷小时数的影响。对于冷却塔供冷方案,分析了不同室内温度、供回水温差下所对应的风机盘管最高供水温度,研究了冷却塔热工性能曲线、冷却塔流量比、供回水温差对冷却塔供水温度的影响,探讨了冷却塔供冷不同工况下运行水温、切换温度、供冷时长、水泵配置及供冷系统运行策略。最后,计算了新风供冷和冷却塔供冷系统的节能量及经济性。 相似文献
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冷却塔供冷系统运行能耗影响因素的研究与分析 总被引:11,自引:3,他引:8
根据大量模拟结果,分析了冷却塔供冷系统形式、气象条件、建筑负荷特点、供冷温度等对冷却塔供冷系统运行能耗的影响,以深化对冷却塔供冷系统的认识与理解,为此项技术的推广应用提供参考。 相似文献
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文章根据昆明卷烟厂联合厂房常年供冷车间空调负荷特点,提出室内空调设计参数全年采用夏季室内状态点,并根据热工计算分析了冬季及过渡季时冷却塔供冷、溴化锂冷水机组供冷、新风线性增加供冷、全新风供冷模式的运行能耗,提出了冬季及过渡季时冷却塔供冷模式能耗最小,最有利于卷烟厂常年供冷车间的节能运行。 相似文献
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冷却塔供冷技术在我国应用的模拟与预测分析 总被引:19,自引:2,他引:17
认为冷却塔供冷 (又称免费供冷 )是一种节能降耗的系统形式。建立了冷却塔供冷系统在我国不同条件下的运行能耗模型 ,在模拟建筑上预测了全国 7个典型城市的应用情况 ,给出并分析了节能率、供冷温度等可用作设计参考的预测结果。 相似文献
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闭式冷却塔直接供冷及其经济性分析 总被引:3,自引:1,他引:2
对过渡季或全年需要供冷的空调系统,提出了在室外环境湿球温度比系统要求的冷水温度低3~5℃时制冷机停止运行,利用蒸发冷却技术由闭式冷却塔直接为系统提供冷量的节能方案;采用对数平均温差法计算得到了系统转换为直接供冷模式的工况条件;实例分析表明,采用闭式冷却塔在主机不运行工况下直接供冷节能效果明显,增加的设备投资可在两年内收回,具有较好的经济效益. 相似文献
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电子厂房空调系统需要全年供冷,在冬季,利用冷却塔自然供冷可以节约冷水机组的运行能耗,其节能潜力较为可观。本文针对上海地区某电子厂房空调系统,分析了冷却塔间接供冷方式下供水温度、冷却塔及板式换热器效率对自然供冷率的影响。通过自然供冷率的对比,分析系统的节能潜力。研究结果表明,在12月到3月四个月内采用冷却塔自然供冷,可以... 相似文献
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太阳能液体除湿处理热湿地区冷却顶板新风湿负荷 总被引:4,自引:0,他引:4
以广州为例分析了热湿地区冷却顶板空调系统新风冷负荷的特点,显示夏季空调期新风湿负荷占新风总负荷的90%以上.提出了利用太阳能液体除湿处理冷却顶板空调系统新风湿负荷的方案,并将其与常规的冷却除湿方案进行了比较.结果显示,冷却顶板空调系统新风湿负荷的太阳能液体除湿方式比冷却除湿方式节能40%以上,静态投资回收年限为2.2年,认为冷却顶板空调系统新风湿负荷的太阳能液体除湿方式要优于冷却除湿方式. 相似文献
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This paper treats energy and cost performance of a cooling source system with indirect seawater utilization for air conditioning in a commercial complex. Seawater utilization has merits as a cooling source, because seawater temperature is lower than outdoor air in summer and it is cost effective because there is no water monetary cost. Actual operating data has been measured for about 2 years and the chiller and system co-efficient of performance (COP) have indicated about 4.77 and 2.93, respectively, even in summer season and the mean efficiency of the thermal storage system was about 89.9% taking into account heat loss of pumps. In addition, we have constructed simulation models for cooling tower systems, air cooling chiller systems and direct seawater utilization systems then compared them to this system. The electric power consumption of the indirect seawater utilization system was almost the same as the other systems except the air cooling chiller system, because using lower seawater temperature made the chiller efficiency higher. In conclusion, our results showed the indirect seawater utilization system was able to improve the system COP compared to air cooling chiller system, and cancel water consumption compared with the cooling tower system, and cut down an initial and maintenance costs compared with the direct seawater utilization system. 相似文献
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介绍了天棚混凝土辐射供冷的优势;分析了混凝土辐射供冷中天棚最大允许换热能力和室内空气参数的关系、天棚辐射换热量的比例;分析了新风除湿对混凝土天棚供冷的影响以及利用冷却塔进行天棚供冷的可行性。得出的结论对工程实际有很好的指导作用。 相似文献
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This study is to evaluate energy saving potential of ceiling mounted personalized ventilation (PV) system in conjunction with background mixing ventilation compared with mixing ventilation system alone and with mixing ventilation system when occupants are provided with individually controlled desk fans for generating additional air movement at each desk. Control strategy applied includes different number of personalized ventilation air terminal devices used and different PV airflow rates supplied. Energy calculation is based on design conditions in Singapore, representing a hot and humid climate. The results reveal that increasing room temperature can save cooling energy when the combination of PV with ceiling mounted personalized ventilation nozzles and background mixing ventilation is used. In this case the energy for transport of air increases but the total energy decreases, i.e. energy can be saved due to elevated room temperature. Comparing with mixing ventilation plus desk fans, ceiling mounted personalized ventilation cannot only realize better cooling effect but also decrease the total energy consumption. 相似文献
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用天然冷源解决民用建筑内区冬季过热问题的探讨 总被引:1,自引:0,他引:1
介绍了运用冷却塔制低温水和直接利用室外新风解决民用建筑内区冬季过热问题的方法,认为用双分区新风机可以解决直接利用新风方法存在的系统复杂、新风量增大的问题。 相似文献
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In this study, the potential saving of cooling energy by elevated air speed which can offset the impact of increased room air temperature on occupants’ comfort, as recommended in the present standards (ASHRAE 55 2004, ISO 7730 2005 and EN 15251 2007), was quantified by means of simulations with EnergyPlus software. Fifty-four cases covering six cities (Helsinki, Berlin, Bordeaux, Rome, Jerusalem and Athens), three indoor environment categories I, II and III (according to standard EN 15251 2007) and three air velocities (<0.2, 0.5 and 0.8 m/s) were simulated. The required cooling/heating energy was calculated assuming a perfectly efficient HVAC system. A cooling energy saving between 17 and 48% and a reduction of the maximum cooling power in the range 10–28% has been obtained. The results reveal that the required power input of the fan is a critical factor for achieving energy saving at elevated room temperature. Under the assumptions of this study, the energy saving may not be achieved with the methods for air speed increase, such as ceiling, standing, tower and desk fans widely used today when the power consumption of the fan is higher than 20 W. 相似文献
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对于开式地表水源热泵,取水能耗是决定系统节能性的关键因素。在水源热泵机组能耗模型、取水能耗模型等的基础上建立了开式地表水水源热泵系统的能效耦合模型。基于节能率及水泵能耗的规律特点计算得到了不同的冷却塔出水温度下,不同水泵扬程下的动态取水温度限值,建立了开式地表水水源热泵动态取水温度限值的计算方法。并计算得到不同工况条件下的地表水源热泵系统相对传统空调的节能率。 相似文献
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