转轮式全热换热器在北京某办公楼中的应斥

介绍了北京某办公楼中转轮式全热换热器的设计，对系统进行节能和经济性分析，并对这种系统的应用提出了一些建议；通过分析认为合适的转轮式全热换热器不仅可以节约运行能耗，还可以节省初投资。作为一种节能技术有着广阔的应用前景。     

转轮式全热换热器在SPF实验动物环境中的应用探讨

通过对目前SPF实验动物房能源消耗大,运行成本高昂等问题的分析,对转轮式全热换热器和板式全热换热器进行了全面的经济性比较,并探讨了转轮换热器引起的交叉污染的解决方法。认为转轮式全热换热器节能效果明显,应用在SPF实验动物房空调系统中具有较好的经济效益。     

热回收装置在空调工程中的应用

从节能角度提出热回收系统的重要性,分析了各种热回收装置的特点;结合工程实例,分析了转轮式全热回收器在空调系统中的节能效果和经济效益。     

医院空调节能运行方案及其舒适性研究

采用K-ε湍流模型对病房内三维紊流流动和传热进行了数值模拟，计算得到单元式集中空调系统与全热换热器在三种不同运行模式下室内热舒适性指标PMV及PPD的分布情况。通过比较不同运行模式下人体活动区域内的热舒适性指标分布情况，确定空调系统与全热换热器的节能运行方案。     

空调系统中全热换热器的实验研究

通过在空调系统中增设全热换热器,利用排风与新风进行热交换来实现热回收,能够显著减少空调系统的能耗。针对全热换热器,确定热湿交换性能实验方案,并进行了相应的实验测试。实验研究结果表明:全热换热器联合空调系统运行导致温度效率和焓效率都低于其独立运行时的温度效率和焓效率,因此空调系统与全热换热器的联合运行必须进行合理匹配。此研究为全热换热器在空调系统中的推广应用提供参考。     

一种全热回收器的设计开发与实验研究

阐述了一种全热回收器的设计及开发过程,并通过实验测试,研究分析了室内外温差、湿度差、焓差对全热回收器效率的影响;探讨比较了全热回收器与普通热管的节能性。     

国防地下工程排风热回收技术经济性分析

在分析比较现有热回收装置的性能及技术要求的基础上,结合国防地下工程实际,以QHW4044型板翅式全热换热器为研究对象,应用室外逐时气象参数,研究分析了全国不同气候分区内5个典型城市的国防地下工程排风热回收改造的技术经济性。研究结果表明,各典型城市的国防地下工程排风热回收系统改造的节能潜力巨大,投资回报期均在3.3年之内,具有很大的经济效益、社会效益和军事价值。     

热回收空调系统风机的匹配特性及选型

热回收空调系统具有自动化程度高,节能环保等优点,能够显著减少空调系统的能耗。对不同情况下热回收空调系统风机的运行工况进行了研究。结果表明,采用一台风机取代全热换热器和空调器中的两台风机能够大幅度提升风机的运行性能。本研究可为热回收空调系统在空调行业的推广和应用提供参考。     

全热回收热泵技术在禽类屠宰行业的应用

本文针对全热回收热泵技术在禽类屠宰行业应用的方案思路与实际运行效果进行说明,并对其综合能耗及运行成本计算方法进行了分析。通过将热泵系统的运行成本与传统能源进行比较,表明全热回收高温热泵技术在实际应用中运行费用明显低于传统制热方式,节能效果显著,经济效益明显,值得大力推广。     

热管换热器同转轮式全热交换器节能效果比较

指出热回收设备在空调系统中的重要性。通过对热管换热器同转轮式全热交换器各自特点以及冬夏季节能效果比较。建议应根据具体情况进行选用。     

相变材料的复合及其热性能研究

针对相变材料应用领域中对相变温度和相变焓的具体要求,采用复合的方法重点对相变材料的相变温度进行调节,复合出具有特定相变温度和较高相变焓的相变材料.论述了相变材料的复合原理,研究了4种相变材料的复合及其热性能,通过理论计算与实际测试相比较,筛选出复合物的最佳配比.研究表明:通过相变材料的复合可以调节材料的相变温度至所需要的范围,并具有较高的相变焓,可保持良好吸收或释放能量的能力.     

Multifunctional HDPE/CNTs/PW composite phase change materials with excellent thermal and electrical conductivities

The risk of leakage and low thermal conductivity severely hinder the wide application of phase change materials(PCMs).In this work,the high-density polyethylene/carbon nanotubes(HDPE/CNTs)porous scaffolds were successfully fabricated via a sacrificial template method followed by the general melt blending and water solvent etching.Subsequently,a series of paraffin wax HDPE/CNTs/PW composite PCMs were obtained combined with the simple vacuum impregnation method.The obtained HDPE/CNTs porous scaffolds can effectively avoid the leakage of PW,meanwhile,the thermal conductivity and electri-cal conductivity of HDPE/CNTs/PW-3:7 are increased by 2.94 times and 13 orders of magnitude compared with the HDPE/PW-3:7 respectively,also,it exhibits high phase change enthalpy(153.95 J/g for melting enthalpy and 152.82 J/g for crystallization enthalpy).From the above perspectives,the HDPE/CNTs/PW-3:7 has promising potential value in the application of light-to-thermal conversion,electro-to-thermal conversion and thermal energy storage.     

Pompes de chaleur à transferts thermiques sans auxiliaires, à convection naturelle et rayonnementHeat pumps operating without power for auxiliaries by using natural convection and radiation heat transfer

With many conventional heat pump systems the energy absorbed by auxiliary equipment (fans, defrosters, pumps) can be higher than the power used by the compressor. For example, with a particular air-air heat pump system the annual energy consumption of the compressor and its crankcase heater is 11 240 kWh, whilst 21 501 kWh of energy are consumed by auxiliary fans, the defrost unit, back-up heating and system heat losses. Some savings can be made by monitoring the interior unit fan to correspond to the running time of the compressor or by increasing the size of the heat pump in order to reduce back-up heating, but the latter solution has proved to be costly.Laboratory experiments since 1976 have been to reduce power consumption of auxiliaries, particularly air-air and air-water systems, by using a solar collector as the heat pump evaporator. The collector is made up of flat plates oriented in such a manner as to receive direct solar radiation, with both faces of the plates absorbing energy from the surrounding air by natural convection. The faces of the plates exposed to solar radiation are preferably painted black, but other colours with a low coefficient of reflection (eg brown, brick red, dark green, etc.) can be used if the evaporator-collector is to be architecturally pleasing. Glazing is not necessary, as is usually the case with solar panels. The collector-evaporator plates, and associated piping, are precharged with refrigerant and ready for connection to the heat pump circuit.A heat pump equipped with this collector-evaporator will provide an annual energy saving of 30% as compared to a standard air—water system. Additional benefits are no defrosting cycles, simplified installation, greater operational reliability, and an increased system COP. A table sets out the performance parameters of this system to show the incidence of back-up solar energy during the months of lesser solar radiation, ie outside the months of June to September, eg the COP during daylight hours (a minimum of about 7 h in December, to a minimum of 14 h in May) averages out at 3.89, and 3.27 during nocturnal hours.The article also describes a water heating system (200 and 300 I) using this collector-evaporator, an air-air heat pump with static (no forced ventilation) heat exchangers, and an air-water system using a static evaporator which will provide a 25% energy saving over its conventional counterpart.     

高温气流总焓测试技术综述

对国内外总焓测试技术方法进行梳理,介绍了多种测焓方法的原理和特点。分析稳态焓探针、热阻式瞬态焓探针、质量注入型焓探针等探针类测焓方法和能量平衡测焓法、光谱测焓法等非探针类测焓方法的优缺点。结合应用实际对这些总焓测试方法的进一步研究提出了建议。     

硅胶转轮除湿器性能的实验研究及其评价方法

介绍了转轮除湿的原理和研究现状,通过焓差实验室制取要求状态点的空气,研究硅胶转轮除湿器的性能,并采用除湿量、除湿性能系数和除湿效率三种评价方法评价其性能。     

Influence of wheel speed during planar flow melt spinning on the microstructure and soft magnetic properties of Fe<Subscript>68.5</Subscript>Si<Subscript>18.5</Subscript>B<Subscript>9</Subscript>Nb<Subscript>3</Subscript>Cu<Subscript>1</Subscript> ribbons

The structure and soft magnetic properties of Fe_68.5Si_18.5B₉Nb₃Cu₁ (at.%) alloy ribbons produced through planar flow melt spinning at different wheel speeds viz. 34, 17 and 12 m/s have been investigated using X-ray diffraction, differential scanning calorimetry, transmission electron microscopy, vibrating sample magnetometer and positron lifetime spectroscopy. Amorphous ribbons formed with different wheel speeds manifested different enthalpy and activation energy of crystallization. The volume fraction of nanocrystalline phase, saturation magnetization and permeability are found to increase whereas coercivity is found to decrease with increasing wheel speed on annealing. A detailed analysis of positron lifetime spectra obtained from the as-spun ribbons has been used to rationalize the variation in microstructure and magnetic properties. The presence of larger number of defects at higher wheel speed increases the volume fraction of nanocrystalline phase on annealing which improves the soft magnetic properties.     

转轮式热交换器在湖南地区的应用

介绍湖南地区的气候情况及使用焓频率法分析转轮式热交换器在湖南各主要城市全年能量回收情况，并进行经济性分析。     

Grinding of Ti-6Al-4V Under Small Quantity Cooling Lubrication Environment Using Alumina and MWCNT Nanofluids

Ti-6Al-4V is a difficult-to-grind material as chips tend to adhere to the grit materials of an abrasive wheel due to its chemical affinity. In the present work, it has been attempted to improve the grindability by application of small quantity cooling lubrication (SQCL) technology using nanofluids, namely, multiwalled carbon nanotube (MWCNT) and alumina nanofluid. The suitability of nanofluids was experimentally evaluated in reciprocating surface grinding using a vitrified SiC wheel. Substantial improvement in grindability under the influence of MWCNT nanofluid (SQCL) could be achieved compared to soluble oil (flood). Reduction of specific grinding forces and specific energy was observed due to the combined effect of superior heat dissipation and lubrication abilities; when the latter one was realized through on-site rolling of MWCNT strands, inter-tubular slip and solid lubrication of the film adhered onto the wheel surface. These outperforming characteristics of MWCNT nanofluid helped in retaining grit sharpness superiorly, thus resulting in better surface finish and less re-deposition of metal on the ground workpiece. On the contrary, Al2O3 nanofluid (SQCL) underperformed even soluble oil (flood). For an ageing effect, Al2O3 nanoparticles resulted in abrasive agglomerates, which led to its failure, despite its good heat dissipation capability.     

喷涂式阻尼车轮振动声辐射特性分析

分析某直型辐板车轮喷涂阻尼材料与否的振动声辐射特性。通过力锤敲击试验,获得车轮的固有频率、模态阻尼比及频率响应函数,分析喷涂式阻尼车轮振动特性。通过半消声室声辐射测试,给出喷涂式阻尼车轮的声能量级,结合车轮振动分析声辐射特性。结果表明,喷涂式阻尼车轮可以有效降低车轮振动和声能量级,与裸轮相比,径向激励下总声能量级可降低6.4 dB,轴向激励下总声能量级可降低4.3 dB。