Abstract
Abstract: In this paper, the prediction of adiabatic capillary tube of heat pump using carbon dioxide is investigated theoretically and experimentally to offer the basic design data for the operating parameters ofthis system. The operating parameters considered in this study include evaporation temperature, cooling pressure of gas cooler, mass flowrate, and the length and diameter of capillary tube. Based on study resultsof several researchers, the correlation predicting the length of capillary tube of CO 2 heat pump was proposed. And the experimental results of evaporation temperature, mass flowrate and cooling pressure in adiabatic capillary tube have an good agreement to those calculated from Eq. (3) within 0.63~10.9%. Therefore, the prediction calculating the length of adiabatic capillary tube of CO 2 heat pump was proposedat the given conditions such as cooling pressure, evaporation temperature and capillary tube diameter. Key words: Carbon dioxide, Capillary tube, Expansion device, Heat pump
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