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Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (5): 72-84.doi: 10.6040/j.issn.1672-3961.0.2019.151

• Energy and Power Engineering—Special Topic on Refrigeration Technology • Previous Articles     Next Articles

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)

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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

CLC Number: 

  • TK02

Fig.1

Phase change energy storage heat exchanger"

Fig.2

Structure diagram of a kind of waste heat recovery device based on dual temperature energy storage heat pipe"

Fig.3

Schematic diagram of a kind of waste heat recovery device based on dual temperature energy storage heat pipe"

Fig.4

Ideal temperature variation of the main parts of the system in the process of heat storage and release"

Fig.5

Simplified diagram of temperature variation in the process of heat storage and release"

Fig.6

The entransy dissipation rate of system, silicon oil and water in the process of heat storage"

Fig.7

Instantaneous entransy transfer efficiency, instantaneous entransy dissipation number and instantaneous thermal resistance of heat exchanger based on entransy dissipation in the process of heat storag"

Table 1

Entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation of phase change energy storage heat exchanger in the process of heat storage when qm, h=0.024 kg·s-1) qm, c=0.003 kg·s-1"

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

Table 2

Entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation of phase change energy storage heat exchanger in the process of heat storage when τ=1 000 s, qm, h=0.024 kg·s-1"

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

Fig.8

Instantaneous entransy transfer efficiency in the process of heat release"

Table 3

Entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation of phase change energy storage heat exchanger in the total process when qm, h=0.024 kg·s-1, qm, c=0.003 kg·s-1"

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

Table 4

Entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation of phase change energy storage heat exchanger in the total process when τ=1 000 s, qm, h=0.024 kg·s-1"

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

Table 5

Entransy transfer efficiency, entransy dissipation number and thermal resistance of heat exchanger based on entransy dissipation of conventional heat exchanger"

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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