Alternative refrigerants have been used in refrigerating and air-conditioning systemsdue to the phase out of CFC-12, HCFC-22 and R502 etc. Most of them are mixtures.The composition fractionation and thermal performanc...Alternative refrigerants have been used in refrigerating and air-conditioning systemsdue to the phase out of CFC-12, HCFC-22 and R502 etc. Most of them are mixtures.The composition fractionation and thermal performance change during refrigerant leakedout from system must be paid attention. The compositions of mixture THR02 were mea-sured by gas chromatographic analysis. Then we developed a general model to calculate thecomposition fractionation of zeotropic, near-azeotropic and azeotropic mixtures. The max-imum deviations between the calculated compositions and experimental results are within5% for the mixture THR02, R4O7C, R404A and R507. THR02 is a near-azeotropic mixture,it is remain unflammable under the worst case, and the change of system performance onlyresulted from composition fractionation during refrigerant leakage can be neglected.展开更多
为了给离心压缩机设备制造厂内整机静态泄漏试验提供思路,对石油化工行业离心压缩机用干气密封静态泄漏试验方案进行了分析。通过比较不同标准对干气密封本体静态泄漏试验和组装后离心压缩机整机静态泄漏试验的要求,分析不同标准对静态...为了给离心压缩机设备制造厂内整机静态泄漏试验提供思路,对石油化工行业离心压缩机用干气密封静态泄漏试验方案进行了分析。通过比较不同标准对干气密封本体静态泄漏试验和组装后离心压缩机整机静态泄漏试验的要求,分析不同标准对静态泄漏试验的关注点和严格程度。结合离心压缩机设备制造厂的实际经验,针对不同型式的干气密封结构,为离心压缩机设备制造厂提供具备可操作性、同时满足标准要求的离心压缩机用干气密封静态泄漏试验方案。通过分析发现,当前最新版API 692 (印)Dry gas sealing systems for axial,centrifugal,rotary screw compressors and expanders(正)内容非常严谨、试验要求十分明确,完全可以指导离心压缩机设备制造厂进行干气密封和离心压缩机的静态泄漏试验;同时对标准中未明确规定但在设计阶段应关注的问题给出了建议。分析结果可为干气密封和离心压缩机设备制造厂进行干气密封和离心压缩机的静态泄漏试验提供指导依据。展开更多
文摘Alternative refrigerants have been used in refrigerating and air-conditioning systemsdue to the phase out of CFC-12, HCFC-22 and R502 etc. Most of them are mixtures.The composition fractionation and thermal performance change during refrigerant leakedout from system must be paid attention. The compositions of mixture THR02 were mea-sured by gas chromatographic analysis. Then we developed a general model to calculate thecomposition fractionation of zeotropic, near-azeotropic and azeotropic mixtures. The max-imum deviations between the calculated compositions and experimental results are within5% for the mixture THR02, R4O7C, R404A and R507. THR02 is a near-azeotropic mixture,it is remain unflammable under the worst case, and the change of system performance onlyresulted from composition fractionation during refrigerant leakage can be neglected.
文摘为了给离心压缩机设备制造厂内整机静态泄漏试验提供思路,对石油化工行业离心压缩机用干气密封静态泄漏试验方案进行了分析。通过比较不同标准对干气密封本体静态泄漏试验和组装后离心压缩机整机静态泄漏试验的要求,分析不同标准对静态泄漏试验的关注点和严格程度。结合离心压缩机设备制造厂的实际经验,针对不同型式的干气密封结构,为离心压缩机设备制造厂提供具备可操作性、同时满足标准要求的离心压缩机用干气密封静态泄漏试验方案。通过分析发现,当前最新版API 692 (印)Dry gas sealing systems for axial,centrifugal,rotary screw compressors and expanders(正)内容非常严谨、试验要求十分明确,完全可以指导离心压缩机设备制造厂进行干气密封和离心压缩机的静态泄漏试验;同时对标准中未明确规定但在设计阶段应关注的问题给出了建议。分析结果可为干气密封和离心压缩机设备制造厂进行干气密封和离心压缩机的静态泄漏试验提供指导依据。
