,相变,传热,广义耗散率," /> ,相变,传热,广义耗散率,"/> 基于<inline-formula id="sddxxbgxb-49-5-72-M1"><img xmlns:xlink="http://www.w3.org/1999/xlink" src="/fileup/inline_graphic/2019/1573435746431_sddxxbgxb-49-5-72-M1.jpg"></img></inline-formula>理论的相变储能换热器传热性能分析
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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (5): 72-84.doi: 10.6040/j.issn.1672-3961.0.2019.151

• 能源与动力工程——制冷技术专题 • 上一篇    下一篇

基于理论的相变储能换热器传热性能分析

周鑫晨(),章学来*(),陈跃,刘璐   

  1. 上海海事大学蓄冷技术研究所, 上海 201306
  • 收稿日期:2019-04-09 出版日期:2019-10-20 发布日期:2019-10-18
  • 通讯作者: 章学来 E-mail:zhouxinchenaria@sina.com;xlzhang@shmtu.edu.cn
  • 作者简介:周鑫晨(1995—),男,浙江舟山人,硕士研究生,主要研究方向为相变储能技术、脉动热管强化蓄热传热技术. E-mail:zhouxinchenaria@sina.com
  • 基金资助:
    上海市教委重点项目(12ZZ154)

Heat transfer performance analysis of phase change energy storage heat exchanger based on entransy theory

Xinchen ZHOU(),Xuelai ZHANG*(),Yue CHEN,Lu LIU   

  1. Institute of Cool Storage Technology, Shanghai Maritime University, Shanghai 201306, China
  • Received:2019-04-09 Online:2019-10-20 Published:2019-10-18
  • Contact: Xuelai ZHANG E-mail:zhouxinchenaria@sina.com;xlzhang@shmtu.edu.cn
  • Supported by:
    上海市教委重点项目(12ZZ154)

摘要:

理论成功应用于常规换热器的基础上,将传递效率、耗散数及基于耗散的换热器热阻应用于相变储能换热器的传热性能分析中。定义广义耗散率并由此推导出相变储能换热器蓄热、放热及总过程的传递效率及其瞬时值。确定耗散数及基于耗散的换热器热阻计算中换热量的取法。选取一种相变储能装置作为分析对象,通过理论分析绘制各主要部分温度变化趋势,进一步简化得到硅油、水的出口温度表达式,作为算例分析基础。结果表明, 传递效率的应用范围最广,可用于计算相变储能换热器蓄热、放热及总过程的(瞬时)不可逆热损失,且评价结果与传热性能相符,瞬时传递效率随蓄热时间的增加先增大后不变再增大,随放热时间的增加先减小后不变再减小; 耗散数在蓄热过程和总过程中的评价结果与传递效率一致,瞬时耗散数随蓄热时间的增加先减小后不变再减小,然而在放热过程中的应用受限。基于耗散的换热器热阻的部分评价结果与实际不符,应用限制较大。蓄热过程及总过程中,当蓄热量、取热量与蓄、放热阶段时长同步变化时, 传递效率、耗散数与基于耗散的换热器热阻几乎无变化;当装置传热性能提高时, 传递效率增大, 耗散数减小,基于耗散的换热器热阻减小;放热过程中,设置参数的变化不影响装置传热性能, 传递效率基本无变化。

关键词: ')">, 相变, 传热, 耗散率')">广义耗散率

Abstract:

Entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation were applied to heat transfer performance analysis of phase change energy storage heat exchanger on the basis of successful application of entransy theory on conventional heat exchanger. The generalized entransy dissipation rate was defined to derive (instantaneous) entransy transfer efficiency of phase change energy storage heat exchanger in heat storage, heat release and total process, and heat transfer rate was determined to calculate entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation. A kind of phase change energy storage heat exchanger was selected as the object, and the temperature variation of main parts were described by theoretical analyses. The temperature variation of outlet of silicon oil and water were further simplified to derive their expression, as the basis of calculation and analyses. The results showed that the application range of entransy transfer efficiency was the widest, which was used to calculate the (instantaneous) irreversible heat loss of phase change energy storage heat exchanger in heat storage, heat release and total process. The evaluation results of entransy transfer efficiency were consistent with heat transfer performance and its instantaneous values were increased first, then unchanged, finally increased, with increasing heat storage time, and were decreased first, then unchanged, finally decreased, with increasing heat release time. The evaluation results of entransy dissipation number in heat storage and total process were consistent with that of entransy transfer efficiency. With increasing heat storage time, its instantaneous values were decreased first, then unchanged, finally decreased, while its application was limited in heat release process. The application of thermal resistance of heat exchanger based on entransy dissipation was the most limited since parts of its evaluation results were inconsistent with actual state. In heat storage and total process, the entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation were nearly unchangeable when the heat storage quantity, heat release quantity and stage time in the process of heat storage and release were synchronous. The entransy transfer efficiency was increased, while the entransy dissipation number and the thermal resistance of heat exchanger based on entransy dissipation were decreased when the heat transfer efficiency was improved. In the heat release process, entransy transfer efficiency was unchangeable since the heat transfer performance of system was not influenced by the change of parameters setted.

Key words: entransy, phase change, heat transfer, generalized entransy dissipation rate

中图分类号: 

  • TK02

图1

相变储能换热器"

图2

一种双温储能热管余热回收装置结构图"

图3

一种双温储能热管余热回收装置原理图"

图4

蓄放热过程中装置主要部分的理想温度变化趋势"

图5

蓄放热过程冷热流体温度变化简化图"

图6

蓄热过程中装置、硅油及水的耗散率"

图7

蓄热过程中的瞬时传递效率、瞬时耗散数及瞬时基于耗散的换热器热阻"

表1

相变储能换热器蓄热过程中,qm, h=0.024 kg·s-1,qm, c=0.003 kg·s-1时的传递效率、耗散数及基于耗散的换热器热阻"

τ/s ηh/% ΔE* RE/(K·s·kJ-1)
1 000 92.898 2.718 386.253
2 000 92.879 2.720 385.787
3 000 92.873 2.720 385.631

表2

相变储能换热器蓄热过程中,τ=1 000 s, qm, h=0.024 kg·s-1时的传递效率、耗散数及基于耗散的换热器热阻"

qm, c/(kg·s-1) ηh/% ΔE* RE/(K·s·kJ-1)
0.001 91.019 3.117 443.010
0.002 92.004 2.917 414.632
0.003 92.898 2.718 386.253

图8

放热过程瞬时传递效率"

表3

相变储能换热器总过程中,qm, h=0.024 kg·s-1,qm, c=0.003 kg·s-1时传递效率、耗散数及基于耗散的换热器热阻"

τ/s ηh/% ΔE* RE/(K·s·kJ-1)
1 000 95.131 2.123 603.515
2 000 95.117 2.125 602.914
3 000 95.112 2.126 602.714

表4

相变储能换热器总过程中,τ=1 000 s, qm, c=0.024 kg·s-1时的传递效率、耗散数及基于耗散的换热器热阻"

qm, c/(kg·s-1) ηh/% ΔE* RE/(K·s·kJ-1)
0.001 92.000 2.919 829.690
0.002 93.705 2.521 716.603
0.003 95.131 2.123 603.515

表5

常规换热器的传递效率、耗散数及基于耗散的换热器热阻"

换热器编号 换热流体 T1/K T2/K c/(kJ·kg-1·K-1) qm/(kg·s-1) ηb/% ΔE* RE/(K·s·kJ-1)
1 热流体 431.0 368.7 1.07 0.74 98.81 0.89 2.13
冷流体 312.3 318.5 4.20 1.78
2 热流体 368.0 313.0 2.84 27.78 99.17 0.50 0.01
冷流体 298.0 313.0 4.20 68.88
3 热流体 358.0 313.0 13.49 0.54 99.59 0.47 0.08
冷流体 305.0 315.0 4.04 8.07
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