【作者】 田向宁；

【导师】 姜永成；

【作者基本信息】 哈尔滨工业大学 ， 供热、供燃气、通风与空调工程， 2007， 硕士

【摘要】 板式换热器具有传热系数高、投资成本低、配置方便等优点,被广泛应用于电力、化工、建筑、暖通等诸多行业。板式换热器是能量传递环节中的一个重要设备,它的热工性能决定设备容量的选择;它的阻力特性决定其传输设备(主要是循环泵)容量的选择,而且两者都关系到整体设备的投资与运行费用。因此这两个参数在设计板式换热器时是设计者必须准确掌握的重要参数,所以准确测量其特性参数是非常重要的。板式换热器的产品很多,但是其热工性能指标却不是十分准确,而且有的计算结果存在明显的误差。因此本文针对板式换热器的热工性能测试及数据处理方法进行了深入研究。板式换热器的热工性能测试方法主要有稳态法和瞬态法。目前稳态法应用比较广泛,主要有牛顿换热公式直接求得法、等雷诺数法、威尔逊法、等换热系数法、等流速法、修正威尔逊法和多参数优化拟合法等常用方法。而瞬态测试法应用较少,本文主要从测试条件和数据处理两个方面分析了稳态法的特点。本文利用应用软件C++Builder开发出板式换热器的计算软件,实现了板式换热器从测试到公式拟合的全部自动化。该计算软件不仅计算界面友好而且操作简单方便,可以用作板式换热器测试的数据处理软件。通过对板式换热器能效比及其Q/N曲线的研究,对板式换热器的换热能力及其换热的经济性作出了客观评价,对板式换热器的选型和实际运行的经济性提出了建议。更多还原

【Abstract】 Plate heat exchangers are widely used for electricity, chemicals, construction, HVAC and many other industries as they are at advantage of high transmittance coefficient, low investment cost and convenient setting. Thermal performance of plate heat exchanger determines how to choose capability of equipment, while its pressure drop characteristics determines how to choose the transfers equipment (especial circle pump), and the two determine the investment and operating cost of integral equipments. Therefore the two parameters are the most important parameters to design plate heat exchanger. So it is important to test characteristic parameters of plate heat exchanger accurately.There are many kinds of plate heat exchangers in the market, but their heat performance is always unaccurately even some errors. Therefore, the testing heat performance and data process for plate heat exchanger are studied profoundly in the text.There are two types of methods available in testing the heat exchangers, i.e. transient-state method and steady-state method. The transient-state method is hardly used because of its strict requirement on the testing instruments and conditions. Whereas, the steady-state method is widely used in testing thermal performance of plate heat exchangers, such as Newton heat transfer method, equal Reynolds Number method, equal velocity method, E.E.Wilson method, modified E.E.Wilson method, equal heat transfer coefficient method and multiparameter optimization fitting method etc. In the paper, the steady-state method is carefully analyzed form testing condition and data process.The calculation software for plate heat exchanger was developed with application software C++Builder, then the process form testing to calculation can be achieved automatically by computer. This calculation software can be used to calculate the testing data of plate heat exchanger not only its friendly interface but also easy operation.Based on the study on energy efficiency ratio and Q/N curve, the objective evaluation on the heat excahge capability and economical efficiency for plate heat exchanger are given, some advice is proposed about selection and running in practice.更多还原