中文摘要：

采用数值计算的方法分别对稳态条件下直接产生蒸汽（DSG）太阳能槽式集热管中单相水区、饱和相区和干蒸汽相区的吸收管温度沿周向的分布进行了研究，在此基础上建立了集热器热损模型，并分析了流体温度、质量流量及工作压力对集热管中不同相区热损的影响．结果表明：影响集热器热损的关键因素是流体温度，随着流体与环境温差的增大，集热管中各相区的热损增加；流体的质量流量和工作压力对集热器热损的影响不大．

英文摘要：

The temperature distribution around an absorber tube in the single-phase water region, saturated region and dry steam region of a direct steam generation（DSG） solar collector was studied at steady state along circumferential direction by numerical calculations, based on which the heat loss model of collector was established, while the influence of following factors on the heat loss in different phase regions of absorber analyzed, such as the fluid temperature, mass flow-rate and working pressure, etc. Results show that fluid temperature is the key factor influencing the heat loss of collector, which rises with increasing temperature difference between fluid and ambient air working pressure and mass flow rate of fluid have little influences on the heat loss.