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Shell-and-Tube Minichannel Condenser for Low Refrigerant Charge

机译:壳管式小通道冷凝器,制冷剂量低

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摘要

The design of an innovative shell-and-tube heat pump condenser using 2 mm 1D minichannels is presented. This condenser has been designed aiming at the minimization of the charge, which can be required by safety or environmental restrictions. Nevertheless, minichannels represent also a solution to the high-pressure challenge when using carbon dioxide as a refrigerant. The present prototype was realized for the use with propane in the framework of the European project SHERHPA, concerning the development of heat pumps working with natural fluids. Experimental data for heat transfer and pressure drop are reported in the present paper. The measurements have been obtained using refrigerant R22, which displays a temperature versus pressure saturation curve pretty close to the one of propane. The data have also been compared against a computational procedure for shell-and-tube heat exchangers design. The refrigerant charge has been computed by means of different void fraction correlations, showing that the expected charge is less than half the quantity required by a brazed plate condenser giving the same capacity.
机译:介绍了使用2 mm 1D微型通道的创新管壳式热泵冷凝器的设计。设计这种冷凝器的目的是使电荷最小化,这是安全或环境限制所要求的。然而,当使用二氧化碳作为制冷剂时,小通道也是高压挑战的解决方案。在欧洲项目SHERHPA的框架中,实现了与丙烷一起使用的当前原型,该项目涉及开发使用天然流体的热泵。本文报道了传热和压降的实验数据。已使用制冷剂R22获得了测量值,制冷剂R22显示的温度与压力的饱和度曲线非常接近丙烷之一。数据也已与管壳式换热器设计的计算程序进行了比较。已经通过不同的空隙率相关性计算了制冷剂充注量,表明预期充注量小于具有相同容量的钎焊板式冷凝器所需量的一半。

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