【作者】 郝波；

【导师】 孙优贤； 戴华平；

【作者基本信息】 浙江大学 ， 控制理论与控制工程， 2007， 硕士

【摘要】 热量表是用于供热系统热消耗量计量的仪表。随着政策的进一步明朗，作为供热体制改革和建筑节能中必不可少的关键工具、分户计量供热系统的核心设备，其市场需求必将会越来越大。热量表技术中最关键的是流量的测量。供热系统中做为传热介质的水流量小、温度高，并且在国内还存在着供热水质差，铁屑、杂质多等问题，这些都大大地影响了常用流量测量手段在热量表中的应用效果，另外，国内市场的特点又决定了热量表所采用的流量测量方案必须是低成本的，包括生产成本与维护成本。在这样的背景下，本文首先对热量表领域的相关问题进行了综述，然后探讨了低功耗、智能化热量表的总体结构问题，并就热量表中射流式流量测量、温度测量、热量积分和通信管理等几个模块的设计进行了详细的分析。本文的主要贡献如下：1．分析了热量表流量测量的特殊要求和射流振荡式流量测量的特点，论证了射流流量计在热量表应用中的可行性。2．用CFD工具仿真了附壁式射流振荡腔内的非定常流场动态特性，针对不同的检测方法给出了传感器最佳安放位置的仿真结果，并对射流腔进行了初步的实验测试验证。3．设计了适合热量表高温差精度要求的温度测量方案，并给出了基于MSP430的低功耗热量表设计。更多还原

【Abstract】 Heat meter is a tool for heat consumption measurement in heating systems.As aimportant role in the reform process of domestic heat supply system, it definitelyowns a considerable emerging market.Flowrate metering is the most critical part in heat meter technology.The waterflowing in heating systems is hot and in small-flowrate status.There are much moreproblems with domestic systems,such as poor water quality and iron impurities.Allof these with the demestic market’s low-cost requirement have greatly affected theflow measurement instruments used in the heat meter application.Based on such background, this paper first reviewed heat meter related issues,then explored the overall structure of heat meter, and in succession, made detailedanalyses of module design,including modules such as flowrate measurement,temperature measurement, heat integration and communication management.The main contributions of this paper are as follows:1. The feasibility of employing the fluidic flowmeter in heat meter system isdemonstrated based on the analysis of fluidic oscillation and heat meter’sspecial requirements in flowrate metering.2. Unsteady simulation analysis of fluidic oscillation in FLUENT is carriedon. Based on the simulation, optimal placements of different type of sensorsare proposed.Finally, experimental verification result is analyzed.3. A temperature measurement program is proposed,which is specilized formeeting the requirement of high accuracy in temperature differencemeasurement,and a low-power design of heat meter based on MSP430 isgiven.更多还原