STUDY ON THE THERMOPHYSICAL PROPERTIES IN MIXTURES OF NON-CHLORINE HYDROCARBON REFRIGERaNTS

非氯烃类制冷剂混合物的热物理性质研究

• 批准号: 04650854
• 负责人: TAKAGI Toshiharu
• 金额: $ 1.28万
• 依托单位: KYOTO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650854/
• 关键词: ALTERNATIVE REFRIGERANT; BINARY MIXTURE; VAPOR PRESSURE; ULTRASONIC SPEED; PVT; 代替フロン

Among hydrochlorofluorocarbons, HCFCls, chlorodifluoromethane, CHCIF_2 (HCFC-22, critical temperature, T_c=369.30 K ; critical pressure, p_c=4.988MPa) is widely used today as working fluidsinair-conditioning and refrigeration technology. The ozone depletion potential, ODP, due to the evolution of HCFCs, is presumed to be the comparatively lower compared with those for chlorofluorocarbons, CFCs. However, wity the use in a large quantity of HCFC-22 including chlorine atom, the various harmful influences giving to the earth environmental are anxious in the near future. Suitable replacement compounds for CHCIF_2 may be trifluoromethane, CHF_3 (HFC-23), difluoromethane, CH_2F_2 (HFC-32), pentafluoroethane CHF_2CF_3 (HFC-125) and 1,1,1,2-tetrafluoroethane, CF_3CH_2F (HFC-134a), which those have nearly the same vapor pressures and critical parameters with those for CHCIF_2, and/or their binary mixtures.In this project, the vapor pressure, ultrasonic speed and density (PVT) in the liquid phase for binary mixtures of CHF_3+CF_3CH_2F and CH_2F_2+CF_3CH_2F were measured along isotherms from 243 to 333 K and at pressures up to about 30MPa. A sing-around technique were used for the measurement of vapor pressure and ultrasonic speed. And the density (PVT) was observed by a direct weighing technique. The temperature, pressure and/or composition variations for these values are found to give a powerful clue to measure the thermophysical properties for each system of binary mixtures. The results obtained in the lower region of CH_2F_2 + CF_3CH_2F system, which indicated the nearly same properties, may be noted as a alternative fluid of chlorodufluoromethane CHCIF_2.

在氟氯烃中，HCFC-13、一氯二氟甲烷、CHClF_2（HCFC-22，临界温度T_c=369.30 K，临界压力p_c= 4.988 MPa）是目前空调制冷技术中广泛使用的工质。由于氟氯烃的演变，臭氧消耗潜能值（ODP）被认为是相对较低的氯氟化碳（CFCs）。然而，随着含氯原子的HCFC-22的大量使用，其对地球环境的各种有害影响令人担忧。合适的CHClF_2替代化合物可以是三氟甲烷CHF_3（HFC-23）、二氟甲烷CH_2F_2（HFC-32）、五氟乙烷CHF_2CF_3（HFC-125）和1，1，1，2-四氟乙烷CF_3CH_2F（HFC-134 a），它们的蒸气压和临界参数与CHClF_2和/或它们的二元混合物的蒸气压和临界参数几乎相同。在沿着温度范围内，测量了CHF_3+CF_3CH_2F和CH_2F_2+CF_3CH_2F二元混合物在243 ~ 333 K和30 MPa压力范围内的液相蒸气压、声速和密度。采用一种环绕声技术测量了蒸汽压和超声速。采用直接称重法测量密度（PVT）。这些值的温度，压力和/或组合物的变化被发现给一个强有力的线索来测量每个系统的二元混合物的热物理性质。在CH_2F_2 + CF_3CH_2F体系的低区得到的结果表明，它们的性质基本相同，可以作为二氟氯甲烷CHClF_2的替代流体。

项目成果

Kenji Mishima: "Bubble point pressures fro chlorodifluoromethane+1,2-dichloro-1,1,2,2-tetrafluoroethane" Journal of Chemical and Engineering Data. 38. 49-52 (1993)

Kenji Mishima：“一氯二氟甲烷 1,2-二氯-1,1,2,2-四氟乙烷的泡点压力”《化学与工程数据杂志》。

T.TAKAGI: "ULTRASONIC SPEED IN LIQUID 1,1-DICHLORO-1-TRIFLUOROETHANE AT TEMPERATURES FROM 283 TO 373K AND UP TO 75MPA" J.CHEM.ENG.DATA. 38. 60-62 (1993)

T.TAKAGI：“液体 1,1-二氯-1-三氟乙烷中的超声波速度，温度从 283 到 373K，压力高达 75MPA”J.CHEM.ENG.DATA。

T.TAKAGI: "ULTRASONIC SPEED IN LIQUID DIFLUOROMETHANE UNDER HIGH PRESSURES" HIGH TEMP.-PRES. (inpress).

T.TAKAGI：“高压下液态二氟甲烷的超声波速度”

Toshiharu Takagi: "Ultrasonic spedds in liquid difluoromethane under high pressures" High Temperatures High Pressures. (発表予定). (1994)

Toshiharu Takagi：“高压下液态二氟甲烷的超声波加速”（高温高压）（即将发表）。

Kenji Mishima: "Bubble point pressures for chlorodifluoromethane+1,2-dichloro-1,1,2,2-tetrafluoroethane,bromotrifluoromethane+1,2,dichloro1,1,2,2-tetrafluoroethane,and---." Journal of Chemical and Engineering Data. 38. 49-52 (1993)

Kenji Mishima：“氯二氟甲烷 1,2-二氯-1,1,2,2-四氟乙烷、溴三氟甲烷 1,2、二氯 1,1,2,2-四氟乙烷和---的泡点压力。”