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单螺杆膨胀机散热损失的实验研究
陈如梦,王伟,赵英坤,吴玉庭,马重芳
0
(北京工业大学环境与能源工程学院 传热强化与过程节能教育部重点实验室 传热与能源利用北京市重点实验室)
摘要:
单螺杆胀机作为有机朗肯循环系统中最适合的膨胀机类型之一,其性能对循环系统有重要影响。本文实验研究了有机朗肯循环系统中单螺杆膨胀机机壳及润滑油的散热损失及其在不同工况下对膨胀机性能的影响。实验结果表明,当进气温度由80 ℃升至123 ℃时,单螺杆膨胀机的散热损失增大,其中润滑油散热损失为主要散热损失,其散热量从0.5 kW增至1.05 kW。随着膨胀比的增加,各散热损失占比逐渐减小。其中,当进气温度由80℃升至123 ℃时,机壳散热损失占比为5.1%~2.5%,润滑油散热损失占比为16.1%~9.5%。说明随着进气温度的增加,膨胀机性能逐渐改善,工质气体通过散热损失的能量比例逐渐减小,散热损失对膨胀机性能的影响逐渐减小。
关键词:  单螺杆膨胀机  散热量  散热损失占比  性能
DOI:
投稿时间:2018-08-09修订日期:2018-10-12
基金项目:国家重点研发计划(2016YFE0124900)资助项目。
Experimental Study on Heat Loss of Single Screw Expander
Chen Rumeng,Wang Wei,Zhao Yingkun,Wu Yuting,Ma Chongfang
(College of Environmental and Energy Engineering, Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education, Key Laboratory of Heat Transfer and Energy Conversion, Beijing municipality, Beijing University of Technology)
Abstract:
The performance of a single crew expander, which is among the most suitable types of expander in the organic Rankine cycle system, plays an important role in the system. One of the essential factors influencing a single crew expander performance is heat loss. This study experimentally investigated the heat losses of shell and lubricating oil based on the different inlet parameters of the single screw expander. Results demonstrated that the heat loss in the single screw expander would increase with higher inlet temperature within the 80–123 ℃ range. Heat loss in lubricating oils was found to be the main form of heat loss, increasing from 0.5 to 1.05 kW. In addition, an increase in the inlet temperature would lead to a greater expansion ratio of the single screw expander, eventually leading to an increase inthe output power. On the contrary, the proportion of each heat loss decreased. In particular, the shell and lubricating oil heat loss ratio decreased from 5.1% to 2.5% and from 16.1% to 9.5%, respectively, when the inlet temperature increased from 80 ℃ to 123 ℃. This indicates that with an improvement in the performance of the single screw expander, even when the heat loss increased, its effect on the performance of the expander tend to decrease gradually.
Key words:  single screw expander  heat loss  heat loss ratio  performance

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