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排序方式: 共有116条查询结果,搜索用时 15 毫秒
1.
以北京地区办公建筑为重点研究对象,结合实测方法,选取北京地区办公建筑中应用较为广泛的板翅式及转轮式显热回收装置及其系统为实测对象,分析了室外温度、风速等因素对热回收装置的热效率、降低新风能耗的贡献率以及全年运行能耗的综合影响.分析结果表明,板翅式显热换热器在北京地区冬季采暖期使用时,当迎面风速vy1.5 m/s,显热效率η=60%~70%,可降低新风能耗50%以上;而板翅式及转轮式显热回收装置在北京地区夏季的可适应性较差,绝大多数时间η低于《公共建筑节能设计标准》要求的60%. 相似文献
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利用空调器本身的风机从热回收器内引进新风,通过热交换回收排风的能量。采用空气焓差法对空调器引进新风前后进行制冷量、输入功率、能效比(EER)等的对比实验,并测量了换热器的热回收效率。用热回收装置引进新风后基本没有改变空调器的输入功率,相同环境条件下的制冷量增加,EER值增大,焓差热回收效率最高可达到34.12%。 相似文献
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Buildings nowadays are increasingly expected to meet higher and more complex performance requirements: they should be sustainable; use zero-net energy; foster a healthy and comfortable environment for the occupants; be grid-friendly, yet economical to build and maintain. The essential ingredients for the successful development and operation of net zero- and positive-energy buildings (NZEB/PEB) are: thermal simulation models, that are accurate representations of the building and its subsystems; sensors, actuators, and user interfaces to facilitate communication between the physical and simulation layers; and finally, integrated control and optimization tools of sufficient generality that using the sensor inputs and the thermal models can take intelligent decisions, in almost real-time, regarding the operation of the building and its subsystems. To this end the aim of the present paper is to present a review on the technological developments in each of the essential ingredients that may support the future integration of successful NZEB/PEB, i.e. accurate simulation models, sensors and actuators and last but not least the building optimization and control. The integration of the user is an integral part in the dynamic behavior of the system, and this role has to be taken into account. Future prospects and research trends are discussed. 相似文献
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The application of nano-fluids in refrigerating systems is considered to be a potential way to improve the energy efficiency and reliability of HVAC&R facilities and to make economic the use of environment-friendly refrigerants. In this paper, we report a method that uses nanoparticles to enhance the energy efficiency of retrofitted residential air conditioners (RAC) employing HFCs as alternative refrigerants. The reliability and performance of RAC with nanoparticles in the working fluid have been investigated experimentally. A new mineral-based nano-refrigeration oil (MNRO), formed by blending some nanoparticles (NiFe2O4) into naphthene based oil B32, was employed in the RAC using R410a as refrigerant. A method showing how to disperse the NiFe2O4 nanoparticles in the mineral oil refrigeration lubricants is presented together with an investigation of their stability. The solubilities of the new MNRO in R134a, R407C, R410a and R425a were measured. The performances of the RAC, such as the cooling/heating capacity, the power input and the energy efficiency ratio, were determined. The results indicate that the mixture of R410a/MNRO works normally in the RAC. The cooling/heating EER of the RAC increased about 6% by replacing the Polyol-Easter oil VG 32 lubricant with MNRO. 相似文献
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分析了热泵的狭义与广义两种概念的历史成因,建议在热泵理论基础上确立广义热泵的概念。对广义概念下的热泵定义、热泵机组与系统的区分以及热泵运行经济性指标的整合等问题进行了探讨。 相似文献
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空气/水和水/空气双级耦合热泵系统在"三北"地区应用中存的问题及其改进措施 总被引:10,自引:1,他引:10
针对在我国“三北”地区应用热泵供暖所普遍存在的困难和问题,简要介绍了一种能在寒冷地区实现“生态循环供暖”的新型热泵供暖系统,即空气/水和水/空气双级耦舍热泵系统;然后指出了其在应用中存在的问题,即在能够满足空气源熬泵单级运行条件的供暖季大部分时间内,系统仍然需要双级耦合运行,从而使得系统的供热能效比(EER)和季节供热性能系数(HSPF)大为降低;最后,针对这种系统作了改进,提出了一种单、双级混合式热泵供暖系统,使问题得到解决,同时,还对两种系统的季节供热性能系数(HSPF)进行了比较。 相似文献
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我国制冷空调能效标准的现状与发展 总被引:1,自引:0,他引:1
介绍近年来我国制定的电冰箱、房间空调器、单元式空调机和冷水机组等制冷空调装置能效标准的现状和取得的成效,同时分析今后能效发展的方向,说明制定合理的能效标准对于我国节能减排起到了明显的作用。 相似文献