工程科学学报，第40卷，第2期：167-176,2018年2月 Chinese Journal of Engineering,Vol.40,No.2:167-176,February 2018 DOI:10.13374/j.issn2095-9389.2018.02.006;http://journals.ustb.edu.cn CaCL2-LiBr(1.35:1)/H,0工质对的热物性及应用 李娜)，罗春欢12)，苏庆泉2)四 1)北京科技大学能源与环境工程学院，北京1000832)北京科技大学北京高校节能与环保工程研究中心，北京100083 区通信作者，E-mail:suqingquan@usth.cdu.cm 摘要围绕以LB/H,0为工质对的单级太阳能吸收式制冷循环因对太阳能集热温度要求高而难以实现应用的问题，提出 了CCL,-LiBr(1.35:1)/H,0(CaCL,与LiBr的质量比为1.35：1)新型工质对，系统地测定了其结品温度、饱和蒸气压、密度和 黏度，并与LB/H20进行了比较.结果表明，采用CCl2-LiBr(1.35:1)/H20作为太阳能单级吸收式制冷循环的工质对，在同 一制冷工况条件下，其发生温度，即太阳能集热温度比采用LB/H0的情况低6.2℃.另外，采用浸泡法测试了碳钢，316L不 锈钢和紫铜在CCl2-LiBr(1.35:1)/H20中的腐蚀速率，结果表明316L不锈钢和紫铜的腐蚀性非常小，可满足实际工程应用 的要求. 关键词太阳能：吸收式制冷：工质对：结晶温度：饱和蒸气压 分类号TB61.6 Thermophysical properties and applications of CaCl,-LiBr(1.35:1)/H,O as a working pair LI Na,LUO Chun-huan),SU Qing-quan 1)School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Engineering Research Center for Energy Saving and Environmental Protection,University of Science and Technology Beijing,Beijing 100083, China Corresponding author,E-mail:suqingquan@ustb.edu.cn ABSTRACT Absorption refrigeration is an ideal way to utilize solar energy in summer.For a single-stage solar-driven refrigeration cycle based on the typical working pair of LiBr/H,O,the required generation temperature is up to 88.0 C,which is too high for the commonly used flat plate solar collectors or vacuum glass tube solar collectors.Thus far,this problem has been addressed via two meth- ods:(1)using high-temperature solar collectors and(2)applying a two-stage absorption refrigeration cycle.In literature,a study per- taining to the former was conducted on the performance and economic feasibility of a 100 kW single-stage solar-driven absorption air conditioning system using heat pipe vacuum tube solar collectors,and another study pertaining to the latter was conducted on the per- formance and economic feasibility of a 100 kW two-stage solar energy absorption refrigeration air conditioning system using flat-plate so- lar collectors.Their results show that the system cost is high for the former and that the system cost is high and the coefficient of per- formance is low for the latter.In addition,the results show that the latter system is complicated.Thus,there are currently few commer- cial applications for the solar-driven absorption refrigeration system.In this study,a new method has been proposed that can address the existing problem,i.e.,the required generation temperature is too high for flat plate solar collectors or vacuum glass tube solar col- lectors in a solar-driven single-stage refrigeration cycle,using a new working pair instead of LiBr/H2O.In this study,it is found that CaCl,/H,O has an absorption characteristic benefitting refrigeration,although its absorption ability is limited owing to its relatively low solubility.Based on CaCl/H2O,a new working pair of CaCl2-LiBr(1.35:1)/H2O has been proposed.The crystallization tempera- ture,saturated vapor pressure,density,and viscosity of this working pair were systematically measured,and the results show that the 收稿日期：2017-08-13工程科学学报,第 40 卷,第 2 期:167鄄鄄176,2018 年 2 月 Chinese Journal of Engineering, Vol. 40, No. 2: 167鄄鄄176, February 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 02. 006; http: / / journals. ustb. edu. cn CaCl 2 鄄鄄 LiBr(1郾 35颐 1) / H2 O 工质对的热物性及应用 李 娜1) , 罗春欢1,2) , 苏庆泉1,2) 苣 1) 北京科技大学能源与环境工程学院, 北京 100083 2) 北京科技大学北京高校节能与环保工程研究中心, 北京 100083 苣 通信作者, E鄄mail: suqingquan@ ustb. edu. cn 摘 要 围绕以 LiBr/ H2O 为工质对的单级太阳能吸收式制冷循环因对太阳能集热温度要求高而难以实现应用的问题,提出 了 CaCl 2 鄄鄄LiBr(1郾 35颐 1) / H2O(CaCl 2 与 LiBr 的质量比为 1郾 35颐 1)新型工质对,系统地测定了其结晶温度、饱和蒸气压、密度和 黏度,并与 LiBr/ H2O 进行了比较. 结果表明,采用 CaCl 2 鄄鄄LiBr(1郾 35颐 1) / H2O 作为太阳能单级吸收式制冷循环的工质对,在同 一制冷工况条件下,其发生温度,即太阳能集热温度比采用 LiBr/ H2O 的情况低 6郾 2 益 . 另外,采用浸泡法测试了碳钢、316L 不 锈钢和紫铜在 CaCl 2 鄄鄄LiBr(1郾 35颐 1) / H2O 中的腐蚀速率,结果表明 316L 不锈钢和紫铜的腐蚀性非常小,可满足实际工程应用 的要求. 关键词 太阳能; 吸收式制冷; 工质对; 结晶温度; 饱和蒸气压 分类号 TB61郾 6 收稿日期: 2017鄄鄄08鄄鄄13 Thermophysical properties and applications of CaCl 2 鄄鄄LiBr(1郾 35颐 1) / H2O as a working pair LI Na 1) , LUO Chun鄄huan 1,2) , SU Qing鄄quan 1,2) 苣 1) School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Beijing Engineering Research Center for Energy Saving and Environmental Protection, University of Science and Technology Beijing, Beijing 100083, China 苣 Corresponding author, E鄄mail: suqingquan@ ustb. edu. cn ABSTRACT Absorption refrigeration is an ideal way to utilize solar energy in summer. For a single鄄stage solar鄄driven refrigeration cycle based on the typical working pair of LiBr/ H2O, the required generation temperature is up to 88郾 0 益 , which is too high for the commonly used flat plate solar collectors or vacuum glass tube solar collectors. Thus far, this problem has been addressed via two meth鄄 ods: (1) using high鄄temperature solar collectors and (2) applying a two鄄stage absorption refrigeration cycle. In literature, a study per鄄 taining to the former was conducted on the performance and economic feasibility of a 100 kW single鄄stage solar鄄driven absorption air conditioning system using heat pipe vacuum tube solar collectors, and another study pertaining to the latter was conducted on the per鄄 formance and economic feasibility of a 100 kW two鄄stage solar energy absorption refrigeration air conditioning system using flat鄄plate so鄄 lar collectors. Their results show that the system cost is high for the former and that the system cost is high and the coefficient of per鄄 formance is low for the latter. In addition, the results show that the latter system is complicated. Thus, there are currently few commer鄄 cial applications for the solar鄄driven absorption refrigeration system. In this study, a new method has been proposed that can address the existing problem, i. e. , the required generation temperature is too high for flat plate solar collectors or vacuum glass tube solar col鄄 lectors in a solar鄄driven single鄄stage refrigeration cycle, using a new working pair instead of LiBr/ H2O. In this study, it is found that CaCl 2 / H2O has an absorption characteristic benefitting refrigeration, although its absorption ability is limited owing to its relatively low solubility. Based on CaCl 2 / H2O, a new working pair of CaCl 2 鄄鄄LiBr(1郾 35颐 1) / H2O has been proposed. The crystallization tempera鄄 ture, saturated vapor pressure, density, and viscosity of this working pair were systematically measured, and the results show that the