摘要
用设计工况性价比评价集热器在太阳能制冷系统中的性能时,通常没有考虑系统运行时气象参数变化的影响.在不同气象条件下,对5种集热器构成的双元工质制冷系统性价比进行了排序对比,并以太原地区为例,对设计气象条件与寿命期气象条件下太阳能制冷系统集热器的热性能及经济性进行了分析.结果表明,气象参数变化时,各种集热器构成的制冷系统性价比排序也随之变化.这说明采用气象条件特定的设计工况性价比评价集热器不合理,综合考虑寿命期气象条件的寿命期性价比更全面.在太原地区,双层盖板平板集热器用于太阳能喷射制冷系统,寿命期性价比最优;热性能最优的CPC集热器在相同制冷量下,所需集热面积最小,为双层盖板集热器的58.6%,减少了安装空间.
When collector performance in solar cooling system is evaluated through the ratio of system cost to cooling capacity under design conditions (R_1), the influence of varying weather parameters is usually neglected. In the research,five different R_1s of ejector cooling systems with different collectors and the same non-(azeotropic) binary mixture refrigerant are sorted and compared under various weather conditions. Thermal performance and economy of collectors in solar cooling system from samples in Taiyuan are analyzed under both design conditions and any other weather condition in the life span. The study shows that the order of the ratios would change with weather parameters. Thus, it′s more rational and practical to evaluate collectors through ratios of system cost to cooling capacity under all kinds of weather conditions in the life span (R_2) synthetically than that only under design conditions. In the city of Taiyuan, the R_2 of solar ejector cooling system, which the double-glazed collector is applied to, is optimum. To achieve the same amount of refrigeration, CPC vacuum-tube collector with optimum thermal performance requires the smallest collector area, only 58.6% of the area the double-glazed collector requiring, and therefore reduces installation space significantly.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2004年第10期901-905,共5页
Journal of Tianjin University：Science and Technology
基金
南开大学 天津大学联合科学研究院基金项目(200111).
关键词
太阳能
喷射式制冷
双元非共沸工质
太阳能集热器
性价比
solar energy
ejector cooling system
binary non-azeotropic binary mixture refrigerant
solar collectors
ratio of system cost to cooling capacity
