带回热循环的闭路式热泵干燥装置

介绍一种具有回热循环的闭路式热泵干燥装置,其除湿率高,能量利用率高,且封闭循环,是较理想的节能型环保型干燥装置。     

带回热循环的闭路式热泵干燥装置

介绍一种具有回热循环的闭路式热泵干燥装置,其除湿率高,能量利用率高,且封闭循环,是较理想的节能型环保型干燥装置。     

节能环保型热泵干燥装置

介绍一种具有回热循环的闭路式热泵干燥装置,其除效率高,能量利用率高,且封闭循环,是较理想的节能,环保型干燥装置。     

余热回收式热泵干燥装置的设计与分析

为提高热泵干燥装置的节能效率,设计并研制了能够对干燥室排出的高温气体进行余热回收的热泵干燥装置,并对其进行了性能测试。采用可编程控制器对热风的温度、湿度和风速进行调节,并可对干燥室排出的废热进行回收利用。利用该热泵干燥装置对香菇进行的干燥实验表明:该热泵出风口温度可达65℃,干燥室内温度分布均匀;与电加热干燥装置相比,该装置的干燥时间可缩短5~7 h,每度电的处理量提高了2.3倍,并且提高了干燥品质。     

热泵干燥装置的节能研究

对热泵干燥装置混合工质进行优选,建立典型热泵干燥装置结构数学模型,研究提出目标函数并开发出适合热泵干燥结构的程序算法。     

热泵干燥装置数据采集系统的开发

热泵干燥系统因其清洁、节能并且能较好地保持干燥物料品质而受到广泛关注,它的性能受系统运行捍干燥室空气流速、温度、相对湿度以及制冷系统中蒸发压力、冷凝压力等因素的影响。干燥过程中合理控制这些参数对系统的干燥性能耗影响很大。本文采用ＶＢ６．０中的串行通讯控件来实现计算机自动采集、监控这些参数,并触发越限报警,从而不仅降低了干燥过程中人工反复读数记录的操作强度,而且提高了控制精度。     

热泵干燥系统的结构与节能

热泵干燥系统的循环结构对机组运行能耗有明显的影响,本文讨论了目前热泵干燥系统的各种循环结构,并从节能的角节着重分析了封闭循环,开式循环和半开式循环。     

热泵干燥装置的技术经济及环境分析

热泵干燥具有节能、低温干燥及环境友好等优点,但与普通干燥装置相比,有初投资大等不足。本文以中小型热泵干燥装置为背景,对热泵干燥装置与普通干燥装置在采用电能、煤、天然气为能源时的技术、经济、环境特性进行了对比分析,为热泵干燥装置的应用提供了直接的参考。     

双制冷剂热泵热水器及其基本特性分析

针对单一制冷剂热泵热水器运行工况和除霜等方面的不足,给出了一种双制冷剂热泵热水器,具有不同季节运行参数波动小、可提供低温和中温两种热水、除霜耗能少等特点。     

Heat-pipe enhanced solar-assisted heat pump water heater

A heat-pipe enhanced solar-assisted heat pump water heater (HPSAHP) is studied. HPSAHP is a heat pump with dual heat sources that combines the performance of conventional heat pump and solar heat pipe collector. HPSAHP operates in heat-pump mode when solar radiation is low and in heat-pipe mode without electricity consumption when solar radiation is high. HPSAHP can thus achieve high energy efficiency. A prototype was designed and built in the present study. An outdoor test for a HPSAHP in the present study has shown that COP of the hybrid-mode operation can reach 3.32, an increase of 28.7% as compared to the heat-pump mode COP (2.58).     

用于污泥干燥的热泵试验研究

叙述了城市污泥干燥处理的必要性,对采用热泵形式进行干燥进行了理论分析,并对理论分析进行了实验验证。     

Humidification-dehumidification water desalination system integrated with multiple evaporators/condensers heat pump unit

A study of the performance enhancement of a humidification-dehumidification (HDH) system integrated with multiple evaporators/condensers heat pump (HP) and heat recovery units is presented. The HP unit is intended to deliver necessary heating for humidifier and heating/cooling for dehumidifier in a new strategy. The proposed integrated system is capable to produce fresh water from the HDH system and HP unit. Four different configurations of the system formed by excluding/adding condensers and evaporators were investigated; mode-A (seawater precooling and reheating), mode-B (seawater reheating), mode-C (seawater precooling and humid air reheating), and mode-D (humid air reheating). Fresh water productivity, fresh water ratio, system water recovery, gain output ratio, specific work consumption, and fresh water production cost were used as performance measuring parameters of the system. The influences of operating parameters on the system performance were analytically studied and experimentally validated for different system configurations. The results indicate the enhancement of the systems' performance with increasing ambient air temperature and humidity, seawater and air flow rates, and with decreasing seawater temperature. The system configuration of mode-B shows the best performance with fresh water production of 61.94 kg/h and gain output ratio of 4.97 which are higher than those of the other configurations by 13%, 55%, 85% and 11%, 48%, and 75%, respectively. Comparisons of the proposed configurations with the other HDH desalination systems available in the literature were presented and better performance of the proposed systems was noticed.     

水源热泵空调系统运行优化

以采用水源热泵机组的某住宅小区为例,分析其建筑的冷热负荷特性,探讨其变化规律;对水源热泵机组、水泵系统、热源井的运行控制策略提出优化方案,为同类工程的节能运行提供参考。     

Performance assessment of contact heat pump drying

A comparative analysis is presented of a novel plate‐type isothermal heat pump dryer and a conventional adiabatic heat pump dryer. The energy performance and drying capacity of each dryer type is investigated subject to operational constraints on the maximum acceptable relative humidity and temperature of air passing over the product. The analysis demonstrates that for applicable products, a significant opportunity exists for improving the energy efficiency of heat pump drying, by a factor of 2–3 times compared with current adiabatic heat pump dryers. The moisture extraction rate is also increased in the contact heat pump dryer, by a similar factor. However, these improvements are shown to be sensitive both to the impact of product thickness on heat transfer and to the relative humidity constraint. Copyright © 2010 John Wiley & Sons, Ltd.     

水源热泵热水器实验研究

水源热泵技术利用少量电能将地表水或地下水的低品位能量转移至高品位,目前正成为节能领域的研究热点.针对水源热泵变冷凝参数的相关研究缺乏的现状,通过搭建水源热泵热水器实验台进行了相应实验研究.在水流量Q为0.7~1.3 m~3·h~(-1),进水温度t为15~30℃范围内,对系统功耗、制热量、制冷量、热泵性能系数COP等参数进行了测量.实验结果表明,在水流量为1.1 m~3·h~(-1),进水温度为20℃时,COP达到最大值,系统平均热泵性能系数COP_(ave)为3.23,此时系统处于最佳运行工况.由此可知,寻找系统的最佳运行工况对热泵系统设计和实际工程应用具有重要的意义.     

CO2工质在热泵热水器中的应用

分析了CO2跨临界循环的特点,介绍了CO2工质在热泵热水器中的研究与应用发展现状,探讨了其目前所面临的问题。与传统制冷剂相比,CO2在热泵热水器中的应用具有广阔的发展前景。