采用不同工质的中高温热泵理论循环特性  

Theoretical Cycle Performances of Working Fluids for Moderately High Temperature Heat Pumps

作　　者：郭涛[1] 王怀信[1] 

机构地区：[1]天津大学机械工程学院,天津300072

出　　处：《天津大学学报》2010年第8期667-673,共7页Journal of Tianjin University(Science and Technology)

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA05Z431);国家自然科学基金资助项目(50476062)

摘　　要：以指定工质侧相变真实平均温度计算方法为基准,考察传统的指定工质侧相变算术平均温度计算方法对循环性能参数以及工质对比评价结果的量化影响,并分析指出传统计算方法的适用条件和范围.采用指定相变真实平均温度的计算方法并结合前期研究中对压缩过程改进的计算方法,在冷凝温度80～140℃的工况范围内指导中高温热泵工质的筛选,筛选出20种臭氧层破坏势(ODP)为0,全球变暖势(GWP)较低的纯质和混合工质,并将筛选出的20种工质与R11和R114进行了对比.结果表明,这20种工质的环境性能和综合循环性能优于R11和R114.A methodology of taking actual mean value of the refrigerant-side phase change temperature as the con-densing/evaporating temperature was proposed for objective comparison of different working fluids for air-conditioning and heat pump applications.Based on the proposed methodology,the quantitative influences of employ-ing arithmetical mean value of the refrigerant-side phase change temperature as the conventional methodology on theoretical cycle performances and the screening quality of working fluids were investigated.The applicable condi-tions and ranges of the conventional methodology were also presented.Some working fluids within the condensing temperature range from 80 to 140 ℃were proposed and evaluated for moderately high temperature heat pumps.Theo-retical investigations of the methodologies proposed in this paper and by the former studies related to the improved method of calculating the compression process in the compressor were carried out.Twenty appropriate recommenda-tions with zero ozone depletion potential（ODP） and low global warming potential（GWP） values,suitable for con-densing temperature above 80 ℃ were made and compared with R11 and R114.Those 20 working fluids present better environmental and cycle performances than R11 and R114.All the 20 working fluids presented in this paper have the potential to be used as working fluids for moderately high temperature heat pumps.

关 键 词：中高温热泵 工质 循环特性 

分 类 号：TB612[一般工业技术—制冷工程]