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摘要：本实验台是针对现有中国热泵市场上新兴的螺纹管换热器的换热性能测试而设计的。在海水养殖、泳池等需要恒温的场所通常会使用热泵机组对水加热或制冷。由于水中含有大量的氯离子，对不锈钢、铜等传统材料有严重腐蚀性，通常使用钛作为换热器材料。由于钛价格昂贵，热泵厂商为了降低成本，都尽力提高换热器的换热效率，减少金属耗量，将钛光管压制成具有螺纹的螺旋管就是众多举措之一。但由于螺纹管螺距、螺深、螺纹形状都对换热器的换热性能和阻力损失产生影响，螺纹管应用虽广，但无论生产者还是使用者对于螺纹管的换热性能和其影响因素都不了解，工程应用通常是选取较大的余量以确保产品性能，这造成了较大浪费，本实验台就是测试不同工况下，螺纹管的螺距、螺深、螺纹形状都对换热器的换热性能和阻力损失的影响关系，同时也提供热泵用其他种类换热器的换热系数和压力损失的参数。36253
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毕业论文关键词：热泵；螺纹管；换热器；实验
The Design of the Test Platform for the Thread Tube Heat Exchanger Used in the Heat Pump
Abstract：This experimental platform was designed for the test of heat exchanger made of screwed-pipe which is used in Chinese heat pump market. Water need to be heating or cooling in the occasion of sea culture or swimming pool, in which, heat pump system will be used. Heat exchanger works in that environment usually made of titanium, because there are much of the chloride ion and it will corrosion Stainless steel or copper. They all want improve the efficiency of heat transfer, in order to reduce the amount of Ti , because it is too expensive to use like Stainless steel. Screwed pipe is one of the most ways. But heat transfer performance and the pressure loss will be influenced by pitch, the depth of screw and thread form, thus, no matter Producers or users have no idea which parameter is the best. And when they use it they always make big allowance to ensure the availability of their product, it makes too much waste. This test platform is aimed to know the Relationship between heat transfer performance ,the pressure loss and pitch, the depth of screw ,thread form. Meanwhile, it offer the test for Heat transfer coefficient and pressure loss of other heat exchanger.
Keywords: heat pump；screwed pipe；heat exchanger；experiment
目 录
摘 要 1
Abstract 2
目 录 3
1 绪论 1
2 初步设计 3
2.1功能分析 3
2.1.1测试换热器水流的阻力特性、氟利昂的流动阻力特性 3
2.1.2不同制冷剂在同种工况下的换热效果 3
2.1.3同种制冷剂不同流速下的换热效果和阻力特性 4
2.1.4水的不同流速对换热效果的影响 4
2.1.5不同换热器在各种工况下的换热能力的对比 4
2.2结构设计 5
2.2.1针对“测试换热器水流的阻力特性、氟利昂的流动阻力特性” 4
2.2.2针对“不同制冷剂在同种工况下的换热效果” 5
2.2.3针对“同种制冷剂，不同流速下的换热效果和阻力特性” 6
2.2.4针对“水的不同流速对换热效果的影响” 6
2.2.5针对“不同换热器在各种工况下的换热能力的对比” 7
2.2.6整体设计草图 8
2.3细节设计 9
2.3.1温度计安装设计 9
2.3.2压力表的安装 9
2.3.3流量计安装----涡街流量计 10