Thermodynamic Analysis of a Compact Thermoelectric Air Conditioner

The thermodynamic characteristics of a compact thermoelectric (TE) air conditioner were investigated from a perspective based on exergy. A new efficiency is developed that is useful in studying TE performance resulting in possible improvement. Exergy analysis is applied to a TE system and its components, and exergy flows and efficiencies are evaluated. It was found that the exergy decreased as the electric current supplied to the TE air conditioner increased. Maximum exergy efficiency was 0.088 with a corresponding cooling capacity of 28.6 W. The exergy efficiency of the compact TE air conditioner was found to be relatively very low when compared with the respective coefficient of performance.     

Thermal Comfort Study of a Compact Thermoelectric Air Conditioner

This paper evaluates the cooling performance and thermal comfort of a compact thermoelectric (TE) air conditioner. The compact TE air conditioner is composed of three TE modules. The cold and hot sides of the TE modules were fixed to rectangular fin heat sinks and fans. Thermal acceptability assessment was performed to find out whether the cooled air met the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Standard-55’s 80% acceptability criteria. A suitable condition occurred at 1 A current flow with a corresponding cooling capacity of 29.2 W, giving an average cooled air temperature of 28°C and 0.9 m/s cooled air velocity. The coefficient of performance was calculated and found to be ∼0.34. Economic analysis indicates that the payback period is 0.75 years when one compact TE air conditioner unit is used instead of a 1-ton conventional air conditioner.     

中央空调的节能控制优化

提出了利用磁力耦合器来取代变频器,进而实现电机的软启动功能,其优势在于起动电流可以大幅度地降低,运行时所产生的噪音也会减少,控制简单,操作易行;能够平均每年节约电能35%以上,在负荷较低的情况下足以达到60%,实现了节能环保的目的。     

空调扇的单片机设计

结合实例阐述了一款以PIC16C57芯片为控制芯片的空调扇的设计构思及其过程。     

变频空调中基于UCC3818的APFC电路设计

本文介绍了较大功率变频空调的一种APFC方案。它应用升压电路，采用平均电流控制，使功率因数达到0．99以上。结果表明，方案具有较高的可靠性。     

Automotive Applications of Thermoelectric Materials

This report reviews several existing and potential automotive applications of thermoelectric technology. Material and device issues related to automotive applications are discussed. Challenges for automotive thermoelectric applications are highlighted.     

汽车自动空调电子控制系统设计

本汽车自动空调电子控制系统参考设计集合了飞思卡尔S12G微控制器产品系列和模拟器件(MC33905、MC33932、MC33937),具有可驱动汽车空调系统中的直流无刷/有刷及步进电机等三种类型电机的功能。同时,汽车自动空调电子控制系统功能丰富,具有根据环境温度、湿度及空气质量等参数的变化,自动调节车内温度和吹风模式并具有去雾、除霜、自动切换空气内外循环等功能。而且,参考设计中的液晶屏可显示丰富的内容,包括日历、温度、风速等,从而实现更加便捷、舒适和安全的驾驶体验。     

空调器控制板的抗干扰设计

主要阐述家用空调器如何提高抗干扰能力,优化电磁兼容性设计和验证抗干扰设计。     

介绍某泳池热泵空调设计

概要介绍泳池热泵空调通风设计计算,坦述泳池热泵原理及优势。     

家用空调的清洗

文章对家用空调的构造、工作原理及污垢对其造成的危害作了全面介绍，并分别介绍了家用空调两大组件：室内机和室外机的清洗方法。文章介绍了专业清洗公司的清洗方法。还对新型空调专用清洗剂的性能特点作了介绍。     

一种空调器的节能显示与控制设计

设计了一种空调器的节能显示和控制方案.从合理设置空调温度出发,让用户直观地看到所设定温度工况下实时显示的空调运行功率和电费.启动空调自动设定制冷温度26℃,供热温度20℃,且可手动调节;辅以指示灯和文字提示用户温度过冷或过热.空调技术层面节能已经遇到瓶颈,行为节能有待加强.设计提高用户行为节能意识,使用户趋向于将空调设定在一个更为合理的节能、健康的温度工况下运行.     

新型中央空调中网络温控器和物联网关设计

针对传统中央空调系统通过RS485总线传输方式带来的干扰增大、自适应差、通讯距离小等问题,本文设计一种新型中央空调控制系统,控制系统中的新型温控器通过Modbus /TCP传输数据。并且设计Modbus /TCP服务器网关,将旧有的基于RS485总线特性和Modbus/RTU协议传输数据的温控器连接到新控制系统中。新型温控器和服务器网关运行于μC/OS-III和LwIP基础上。此系统充分利用现有的温控器设备和总线资源,解决了设备数量限制、系统响应延迟大、通讯距离和速度问题。经过长时间测试,新型温控器网络通信正常,网关工作状态稳定,性能可靠。     

数据机房空调冷通设计和节能降耗探索

电信行业发展初期制定的电子计算机机房空调设计标准，已经不能满足现在数据机房对环境的要求，因此有必要对数据机房空调设计作精细要求，以满足机房设备安全、节能、高效运行的需要。通过数据机房空调安装设计并实施总结发现，新的空调设计理念带来了好的收益：降低空调采购成本，节省精密空调运行能耗。     

Optimized Characterization of Thermoelectric Generators for Automotive Application

New developments in the field of thermoelectric materials bring the prospect of consumer devices for recovery of some of the waste heat from internal combustion engines closer to reality. Efficiency improvements are expected due to the development of high-temperature thermoelectric generators (TEG). In contrast to already established radioisotope thermoelectric generators, the temperature difference in automotive systems is not constant, and this imposes a set of specific requirements on the TEG system components. In particular, the behavior of the TEGs and interface materials used to link the heat flow from the heat source through the TEG to the heat sink must be examined. Due to the usage patterns of automobiles, the TEG will be subject to cyclic thermal loads, which leads to module degradation. Additionally, the automotive TEG will be exposed to an inhomogeneous temperature distribution, leading to inhomogeneous mechanical loads and reduced system efficiency. Therefore, a characterization rig is required to allow determination of the electrical, thermal, and mechanical properties of such high-temperature TEG systems. This paper describes a measurement setup using controlled adjustment of cold-side and warm-side temperatures as well as controlled feed-in of electrical power for evaluation of TEGs for application in vehicles with combustion engines. The temperature profile in the setup can be varied to simulate any vehicle usage pattern, such as the European standard driving cycle, allowing the power yield of the TEGs to be evaluated for the chosen cycle. The spatially resolved temperature distribution of a TEG system can be examined by thermal imaging. Hotspots or cracks on thermocouples of the TEGs and the thermal resistance of thermal interface materials can also be examined using this technology. The construction of the setup is briefly explained, followed by detailed discussion of the experimental results.     

新型通信机房专用空调加湿罐的设计应用

文中针对传统机房专用空调加湿罐的缺点,提出了改良现有电极式机房空调加湿系统,采用不锈钢电极替换原厂家铁镀锌电极,将加湿罐罐体制作成可拆卸式,便于清洗或更换电极,提升了机房空调的加湿效果,降低了网络运维费用,实现空调节能降耗。     

空调器使用过程中性能衰减分析

空调器使用过程中其性能会出现不同程度的衰减,衰减程度过大则会严重地影响空调器的制冷、制热能力,从而影响用户的使用舒适性.引起空调器使用过程中性能衰减的原因有很多,选择了其中几项比较关键的因素进行了量化分析,为后期产品的优化提供了有效的数据参考.