两级压缩空气源热泵结霜性能试验研究  

Experiment on Frosting Performance of Two-stage Compression Air Source Heat Pump

作　　者：金宁[1] 李生飞[1] 张科[1] 吴兆林[1] 沈永兵 张雷 

机构地区：[1]上海理工大学,上海200093 [2]浙江艾博申科控制技术有限公司,嘉兴314202

出　　处：《制冷学报》2010年第5期38-43,共6页Journal of Refrigeration

摘　　要：虽然空气源热泵得到了广泛的应用,但是空气源热泵机组在冬季低温环境下运行,其蒸发器表面结霜,会严重影响效率。本文研究了两级压缩空气源热泵在低温工况下一些参数变化对风冷热泵结霜的影响,以及结霜条件下热泵机组性能参数的变化。研究表明:在0℃以下,结霜量以及结霜速度随着温度的升高而增多和加快,在进风温度在0℃左右的时候结霜最严重。温度在3℃的时候,结霜却不如前者严重。而当温度达到-7℃以下时,结霜不是很明显,特别是在相对湿度为90%,温度为-12℃时几乎不结霜。当蒸发器壁面的温度与空气的露点温度比较接近,而且空气含湿量大时,结霜速度最快。在保持进风温度一定,相对湿度越大,换热器风侧表面结霜量也就越多。相对湿度变化对结霜量的影响比温度要大,因此环境相对湿度是影响空气源热泵机组结霜、除霜特性的主要因素。同时,机组在结霜条件下运行时,机组的制热量和COP降低,综合性能下降。这一研究对翅片管式蒸发器除霜具有指导意义。In this study, the experiments were conducted on a two-stage compression air source heat pump under low temperature conditions to explore the influence of parameters on frosting and analyze the variation of the performance under frosting.The results show that when the ambient air temperature was below 0℃, both frost volume and frosting rate increased with the temperature, and frosting was most serious at 0℃ while frosting was less serious at 3℃.When the temperature was below-7℃, the frosting was not obvious.When evaporator wall temperature was close to air dew point and air humidity was high, frosting was dramatic.The influence of relative humidity on frosting was more significant than that of ambient air temperature.In addition, the heating capacity and COP of the heat pump decreased under frosting conditions.

关 键 词：工程热物理 空气源热泵 两级压缩 结霜 

分 类 号：TB657[一般工业技术—制冷工程] TQ051.5[化学工程]