The electric-driven heat pump technology is commonly applied for space heating and cooling for buildings,and also becomes the key link for cooperation with power grid to consume clean electricity.This paper proposes a high-efficiency heating and cooling system by combining the electric-driven heat pump technology with the medium-depth ground heat exchanger for heating in winter and the cooling tower for cooling in summer.Then the user-side energy storage system is applied for daily heat and cool storage.With this system,the design method and control strategy are proposed to fully absorb the local photovoltaic power generation and municipal clean power.Furthermore,this paper conducts a case study on a large public building with quantitative analysis,so as to analyse the actual energy-saving and CO2 emission reduction effect.
According to the characteristics of heat dissipation process and the structural characteristics of traditional heat dissipation device, pulsating heat pipe (PHP) and traditional The pin-finned heat sink are used to simulate the cooling process of CPU, so as to meet the cooling requirements of computer CPU. By comparing the heat transfer perform of the two heat sinks under three conditions: the top wall temperature of the heat sink, the wall temperature of the heat sink and the temperature difference between the inlet and outlet of hot water, it can be found that the heat transfer performance of the PHP radiator is better. The experimental results show that in order to further improve the heat dissipation performance of the computer CPU, the CPU radiator device can be manufactured by the PHP device, and the PHP technology has broad application prospects in electronic heat dissipation.
中深层地埋管热泵供热系统的运行性能受地热地质条件影响显著.本文针对新建项目缺乏地热地质资料的情况,提出了该技术的现场测试平台及方法,在建设初期即可明确实际应用效果.将该方法应用于我国寒冷地区某新建项目,实测结果表明,1根埋深2 750 m的中深层地埋管连续运行尖峰取热能力达到450 kW,热泵机组尖峰供热能力达到600 kW.对中深层地埋管取热特性、热泵系统运行特性开展了变工况测试研究,可为项目规划设计及技术的推广应用提供数据支撑.
分别针对DN50和DN80 2种大管径管道开展了冰浆流动阻力特性实验研究,实验均处于湍流.实验发现:在低雷诺数下,冰浆阻力系数远大于适用于纯水单相流的Blasius关联式计算值,且含冰率越大,阻力系数越大;而在高雷诺数下,冰浆的阻力特性符合Blasius关联式,不同含冰率下的阻力系数都与纯水一致;含冰率和管径对冰浆阻力系数何时进入Blasius曲线有影响,含冰率越大、管径越大,则开始进入Blasius曲线的雷诺数越大;相较于直管,弯头的临界流速更高,更容易出现堵塞,且含冰率越大,临界流速越大.
湿度控制对工业生产有着重要意义.在锂电池、制药、食品等行业中,低湿环境是产业有效发展的重要保障.本文首先调研了相关低湿行业的除湿需求;然后介绍了为保障低湿环境需求而常用的深度除湿技术,包括冷冻除湿、液体吸收除湿、固体吸附除湿、膜除湿及多技术联合除湿,并针对低湿环境需求与除湿技术进行了匹配分析;接着介绍了常见深度除湿技术的最新研究进展及一些新型除湿技术,如电解质膜除湿、电渗析除湿等;最后对深度除湿技术的应用及研究进行了总结与展望.
