摘要
As a natural working,fluid carbon dioxide (CO 2) has shown great potential in refrigeration and air conditioning industry. The heat transfer and pressure drop performance of supercritical CO 2 in pipes is necessary for gas-cooler design. This paper presents an experimental investigation of supercritical CO 2 heat transfer characteristics using temperature oscillation method.Considering the variable fluid temperature, an extended and more reasonable temperature oscillation model is built and used for heat transfer coefficient evaluation. The convective heat transfer coefficient of supercritical CO 2 flowing in an aluminum multi-channel flat pipe is measured for the first time.Experiments are performed under one typical pressure and temperature condition.The experimental setup and data acquisition as well as processing program are described in detail. New dimensionless heat transfer data in the form of Nusselt number via Reynolds number are given and analyzed.The results could be a good reference to gas-cooler design.The paper also supplies a general model or tool for determining local convective heat transfer coefficient which can be used more widely.
As a natural working,fluid carbon dioxide (CO 2) has shown great potential in refrigeration and air conditioning industry. The heat transfer and pressure drop performance of supercritical CO 2 in pipes is necessary for gas-cooler design. This paper presents an experimental investigation of supercritical CO 2 heat transfer characteristics using temperature oscillation method.Considering the variable fluid temperature, an extended and more reasonable temperature oscillation model is built and used for heat transfer coefficient evaluation. The convective heat transfer coefficient of supercritical CO 2 flowing in an aluminum multi-channel flat pipe is measured for the first time.Experiments are performed under one typical pressure and temperature condition.The experimental setup and data acquisition as well as processing program are described in detail. New dimensionless heat transfer data in the form of Nusselt number via Reynolds number are given and analyzed.The results could be a good reference to gas-cooler design.The paper also supplies a general model or tool for determining local convective heat transfer coefficient which can be used more widely.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2001年第7期630-634,共5页
CIESC Journal
