CAJ | 학술논문

搭建了 CO2跨临界循环毛细管性能试验台，通过控制变量法，分析了毛细管尺寸（管径、长度）和系统运行工况（入口压力、入口温度）等参数对毛细管质量流量的影响趋势和程度，而且发现：即使在非临界流的情况下，蒸发压力对质量流量的影响也很小。运用量纲分析法计算出了毛细管质量流量无量纲试验关联式：根据毛细管出口压力、入口温度、管径和长度可计算出毛细管 CO2质量流量，并对该方程的可靠性进行了分析。结果表明：95％的预测值和试验值偏差维持在了±10％以内。
탑건료 CO2과림계순배모세관성능시험태，통과공제변량법，분석료모세관척촌（관경、장도）화계통운행공황（입구압력、입구온도）등삼수대모세관질량류량적영향추세화정도，이차발현：즉사재비림계류적정황하，증발압력대질량류량적영향야흔소。운용량강분석법계산출료모세관질량류량무량강시험관련식：근거모세관출구압력、입구온도、관경화장도가계산출모세관 CO2질량류량，병대해방정적가고성진행료분석。결과표명：95％적예측치화시험치편차유지재료±10％이내。
A text facility of capillary tube that reproduces a transcritical refrigeration cycle was constructed.The impact degree and trend of both tube geometry (capillary diameter and tube length)and operation conditions (inlet pressures and inlet tempera-ture)on the CO2 mass flow rate was evaluated by this facility with a strict control of the variables.The exit pressure had no signif-icant effect on the refrigeration mass flow rate even in non-choked capillary tube flows.By performing the dimensional analysis,the non-dimensional correlation was carried out which we used to calculate the mass flow rate before inlet pressure,inlet temperature, tube diameter and tube length had been acquired.The reliability of the equation had been analyzed and the result indicated the mass flow rate predicted is in good agreement with the experimental mass flow rate as 95% of the capillary tube mass flow rate da-tum lie in an error band of ±10%.