OS4-06 キャピラリーチューブを用いたCO2ヒートポンプシステムに関する研究 : 第1報キャピラリーチューブの定常特性(OS4 省エネルギー・小型分散電源コジェネ技術)

概要

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The expansion valve is mainly used CO_2 heat pump systems as an expansion device. Use of the capillary tube in place of the expansion valve, however, is expected to simplify the design, reduce the size and lower the cost. The purpose of this paper is to derive a calculation model for the capillary tube and simulate its characteristics. The capillary tube model is an adiabatic linear flow type. The model is constructed with control volumes, one of which estimates pressure drop of 1kPa. The optimal size is determined based on this model. It has an inside diameter of 3.6mm and a length of 3.23m. The relations between the CO_2 inlet, outlet conditions and mass flow rate in a steady state are clarified.
2005-06-28