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Frontiers in Energy

ISSN 2095-1701

ISSN 2095-1698(Online)

CN 11-6017/TK

邮发代号 80-972

2019 Impact Factor: 2.657

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Frontiers in Energy  2023, Vol. 17 Issue (1): 141-148   https://doi.org/10.1007/s11708-021-0725-4
  本期目录
Performance of a bi-layer solar steam generation system working at a high-temperature of top surface
Jinxin ZHONG1, Congliang HUANG2()
1. School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China; Center for Phononics and Thermal Energy Science, China-EU Joint Laboratory for Nanophononics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2. School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China; Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0427, USA
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Abstract：

Many efforts have been focused on enhancing the vapor generation in bi-layer solar steam generation systems for obtaining as much pure water as possible. However, the methods to enhance the vapor temperature is seldom studied although the high-temperature vapor has a wide use in medical sterilization and electricity generation. In this work, to probe the high-temperature vapor system, an improved macroscopic heat and mass transfer model was proposed. Then, using the finite element method to solve the model, the influences of some main factors on the evaporation efficiency and vapor temperature were discussed, including effects of the vapor transport conditions and the heat dissipation conditions. The results show that the high-temperature vapor could not be obtained by enhancing the heat-insulating property of the bi-layer systems but by applying the optimal porosity and proper absorbers. This paper is expected to provide some information for designing a bi-layered system to produce high-temperature vapor.
Key words： solar steam generation    solar energy    numerical method    porous material
收稿日期: 2020-06-26      出版日期: 2023-03-29
Corresponding Author(s): Congliang HUANG   
 引用本文:   
. [J]. Frontiers in Energy, 2023, 17(1): 141-148.
Jinxin ZHONG, Congliang HUANG. Performance of a bi-layer solar steam generation system working at a high-temperature of top surface. Front. Energy, 2023, 17(1): 141-148.
 链接本文:  
https://academic.hep.com.cn/fie/CN/10.1007/s11708-021-0725-4
https://academic.hep.com.cn/fie/CN/Y2023/V17/I1/141
Fig.1  
Fig.2  
Fig.3  
Fig.4  
a b c d e f g
1 1.38 –0.021 1.36 × 10−4 –4.65 × 10−7 8.90 × 10−10 –9.08 × 10−13 3.85 × 10−16
2 12010.15 –80.41 0.31 –5.38 × 10−4 3.63 × 10−7 – –
3 838.47 1.40 –0.0030 3.72 × 10−7 – – –
4 –0.87 0.0089 –1.58 × 10−5 7.98 × 10−9 – – –
5 –1.42 × 10−6 3.8 × 10−8 –3.85 × 10−12 2.10 × 10−15 – – –
6 13604.73 –90.43 0.28 –4.2 × 10−4 3.18 × 10−7 –9.56 × 10−11 –
7 1.32 × 10−4 5.15 × 10−5 3.90 × 10−8 –1.37 × 10−11 – – –
8 –8.38 × 10−7 8.36 × 10−8 –7.69 × 10−11 4.64 × 10−14 –1.066 × 10−17 – –
9 1047.64 –0.37 9.45 × 10−4 –6.024 × 10−7 1.29 × 10−10 – –
10 –0.0023 1.15 × 10−4 –7.90 × 10−8 4.12 × 10−11 –7.44 × 10−15 – –
  
T/K Hvap/(J·kg–1) ?T/K Hvap/(J·kg–1) ?T/K Hvap/(J·kg–1)
280.10 2484100 ?314.66 2402300 ?349.02 2318500
290.69 2459100 ?316.94 2396800 ?354.49 2304800
297.26 2443600 ?318.95 2392000 ?359.10 2293100
302.10 2432200 ?327.12 2372600 ?363.11 2282800
306.03 2422800 ?333.22 2357500 ?366.66 2273600
309.32 2415000 ?338.12 2345500 ?369.86 2265300
312.15 2408300 ?342.25 2335300 ?372.78 2257600
  
Nomenclature Value
Initial ambient pressure (P0)/Pa 1.01325 × 105
Initial ambient air temperature (T0)/K 293.15
Initial bulk water temperature (Tw)/K 293.15
Initial ambient air velocity (u0)/(m·s–1) 0.1
Initial ambient vapor concentration (cv0)/(mol·m–3) 0.3357
Initial extension height (h)(HK)/mm 20
Initial distance (d)(RS)/mm 12.5
Radiation heat flux (qe)/(W·m–2) 1000
Molecular weight of dry air (Ma)/(kg·mol–1) 0.028
Molecular weight of water (Mw)/(kg·mol–1) 0.018
Porosity of second layer (ϕp) 0.1
Thermal conductivity of porous material (kp)/(W·m–1·K–1) 0.1452
Heat capacity of porous material (Cp,p)/(J·kg–1·K–1) 1650
Density of porous material (rp)/(kg·m–3) 800
Thermal conductivity of thermal insulation materials (ki)/(W·m–1·K–1) 0 or 0.1
Heat capacity of thermal insulation materials (Cp,i)/(J·kg–1·K–1) 0 or 1000
Density of thermal insulation materials (ri)/(kg·m–3) 0 or 1000
Evaporation coefficient (K)/s–1 100000
Surface absorptivity (εa) 1
Surface emissivity (εe) 1
Initial water saturation of second layer (Siw) 1
Simulation time (t)/s 3600
  
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