A Study of Thermodynamic Properties of Next Generation Mixture Refrigerants Including Hydrocarbons

下一代含碳氢化合物混合制冷剂的热力学性质研究

基本信息

批准号：
12450090
负责人：
WATANABE Koichi
金额：
$ 9.54万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

A series of precise measurements of vapor pressures and gas-phase PVT properties of isobutene (R-600a), a hydrocarbon refrigerant, being an important component of the next generation mixture refrigerants with low environmental impact have been conducted by means of the improved Burnett apparatus, since reliable thermodynamic property information about this substance were not available. Sixteen vapor pressure data at temperatures 300-370 K have been obtained, while 48 gas-phase PVT data at 300-380 K. In addition, 9 vapor-pressure data at temperatures down to 260 K were recently obtained, whereas the measurement of temperature dependence of the cell constant of this apparatus is in progress.A density-measuring system with an aid of the vibrating-tube densimeter was newly designed and constructed, and it was then confirmed that the measurement system could provide us a satisfactory performance with rapid and precise measurements as expected. Measurements for pure water, methanol and 3 dif … More ferent MFC alternative refrigerants such as R-134a, R-125 and R-143a have been completed throughout the present research project. Additionally, similar precise density measurements have been carried out for compressed-liquid phases of HFE-245mc and HFE-143m, promising alternative candidates recently developed as next generation refrigerants, as well as for those or natural hydrocarbon refrigerants including propane (R-290) and R-600a.Concerning the analytical studies, on the other hand, a series of thermodynamic properly model with the Helmholtz-energy type equation of state which is effective for the entire fluid phase of typical natural refrigerants including R-290, R-600a and n-butane (R-600), have been developed with a universal functional form. These models developed have been published in one of the leading international journals. A significant success has also been confirmed in developing the mixing rule which does play an important role to formulate the thermodynamic property models for hydrocarbon (HC) mixtures so as to lead to those for the HC + HFC refrigerant mixtures.It should be noted that the thermodynamic property models developed by the present study for 3 HCs mentioned above have been accepted with international qualification for their forthcoming inclusion to the next version of the REFPROP, a thermodynamic property package developed by the U.S. National Institute of Standards and Technology (NIST) and being widely used on the international basis. Less

下一代混合物的异丁烯（R-600A）MPONENT的蒸气呈现和气相PVT特性的一系列精确测量，具有改善的iMeans的含量由于无法获得可靠的热力学特性物质。该设备的细胞套管的温度正在进行中 - 借助振动管密度仪是新设计和构造的，这是世界，这是世界的快速和精确的测量。。 MC和HFE-143M，有前途的替代候选者是下一个制冷剂，包括丙烷（R-290）和R-600A。查看分析研究，分析研究是一系列与Helmholtz-Energy类型的热力学模型，可有效地模型典型的天然制冷剂的整个阶段，包括R-290，R-600A和N-丁烷（R-600），已经开发了这些模型，也已开发出来。在制定混合规则中确认，确实起着重要作用的碳氢化合物（HC）混合物的热力学模型，以便引导n in in in in in in in in in n in n in in in n in in n in n in n in Y NOM NOM in n in n in n in n n n in Y NOM NOTH SH SHOUD。本研究开发的热力学特性模型在上面的3个HC中开发了HABE化，因为它们即将发布到美国国家标准技术研究所（NIST）开发的下一个版本的重建Ackage，并在国际基础上广泛使用。