摘要
基于有限时间热力学理论,在保持无因次制热率RQ为定值的条件下,建立了使得无因次熵产率σs最小的最佳温差分布模型,并分析了热泵机组中用无量纲参数表征的冷热端传热温差x、y,外界高低温热源温差α和冷热端传热性能比β对系统性能的影响.结果表明:在不增加传热温差所造成的不可损失的前提下,可采用增加β的方法来提高制热率,如增大冷凝器面积或传热系数;在冷凝器与蒸发器传热性能及制热率确定的情况下,为减小不可逆损失应提高高温热源温度.
Based on the finite time thermodynamic theory, the best temperature distribution equation of the mini- mum non - dimensional entropy production rate trs is deduced, when the non - dimensional heating rate RO main- tains the set value. The dimensionless quantities x, y, α and β reflecting the temperature differences and the performance parameters ratio are analysed to illustrate how they affect the system performances. The research shows that the RQ can be improved by increasing the β, for instance raising condenser area or heat transfer coeffi- cient. When the heat transfer performance and the heating rate of condenser and evaporator are certain, then the increase of high -temperature heat source temperature can reduce irreversible loss.
出处
《昆明理工大学学报（自然科学版）》
CAS
北大核心
2012年第3期45-49,共5页
Journal of Kunming University of Science and Technology(Natural Science)
基金
国家自然科学基金(项目编号:51066002/E060701)
NSFC-云南联合基金(项目编号:U0937604)
云南省重大产业技术开发专项项目(项目编号:2008CD001)
云南省科技强省计划项目(项目编号:2008KA002)
关键词
有限时间热力学
热泵
无因次制热率
无因次熵产率
finite time thermodynamics
heat pump
non - dimensional heating rate
non - dimensional entropy production rate
