Experimental study on spray heat transfer characteristics of microencapsulated phase change material suspension

doi:10.11949/0438-1157.20220192

Abstract

Abstract:

According to the special properties of microencapsulated phase change material to store and release latent heat, microencapsulated phase change material suspension (MPCMS) and pure water were used as spray media respectively to build a small spray tower device, in which the core material of microencapsulated phase change material is n-dodecane (C₂₂H₄₆). Five spray temperatures (35, 40, 44, 47, 51℃), three air flows (0.011, 0.018, 0.025 m³/s) and two diameters (SMD=80, 240 μm) were set as experimental variables. The heat transfer characteristics between the two media that described and air were investigated. The experimental results show that the supercooling of the phase change microcapsules will affect the heat transfer process. Under normal temperature and humidity, for small droplets, when the air flow rate is 0.018 and 0.025 m³/s, MPCMS at 44 and 47℃ can promote heat transfer better than pure water at the same temperature. When air flow rate is 0.011 m³/s, MPCMS at 44℃ can promote heat transfer better than pure water at the same temperature. For large droplets, MPCMS with spraying temperature of 44℃ has better heat transfer effect than pure water with spraying medium at the same temperature under three kinds of air flow.

Key words: microencapsulated phase change material suspension, spray, particle, convection, heat transfer, supercooling

摘要：

根据相变微胶囊储存和释放潜热的特殊性质，分别使用相变微胶囊悬浮液（MPCMS）和纯水作为喷淋介质，搭建了一个小型喷淋塔装置，其中相变微胶囊的芯材为正二十二烷(C₂₂H₄₆)。实验设定了五个喷淋温度(35、40、44、47、51℃)、三个空气流量(0.011、0.018、0.025 m³/s)和两种直径(SMD=80、240 μm)的大、小液滴作为实验变量，探究了上述两种介质与空气之间的换热特性。实验结果表明：相变微胶囊的过冷会影响换热过程。常温常湿条件下，对于小液滴，当空气流量为0.018、0.025 m³/s时，喷淋温度为44、47℃的MPCMS比相同温度下的纯水更能促进换热；当空气流量为0.011 m³/s时，喷淋温度为44℃的MPCMS比相同温度下的纯水更能促进换热。对于大液滴，在三种空气流量下，喷淋温度为44℃的MPCMS比相同温度下的纯水作为喷淋介质时换热效果更好。

关键词: 相变微胶囊悬浮液, 喷淋, 粒子, 对流, 传热, 过冷

CLC Number:

TB 61⁺1

Bin DONG, Yonghao XUE, Kunfeng LIANG, Zhengyin YUAN, Lin WANG, Xun ZHOU. Experimental study on spray heat transfer characteristics of microencapsulated phase change material suspension[J]. CIESC Journal, 2022, 73(7): 2971-2981.

董彬, 薛永浩, 梁坤峰, 袁争印, 王林, 周训. 相变微胶囊悬浮液喷淋换热特性实验研究[J]. 化工学报, 2022, 73(7): 2971-2981.

Figures/Tables 11

Fig.1 Static heat transfer test device

Fig.2 Sprinkler system device

Fig.3 Relationship between specific heat capacity and temperature

Table 1 Experimental conditions

喷淋介质	SMD/μm	喷淋温度/℃	空气流量/(m³/s)
纯水、MPCMS	80、240	35、40、44、47、51	0.011、0.018、0.025

Fig.4 Thermal image (SMD=80 μm，qv=0.018 m3/s)

Fig.5 Temperature changes of pure water and MPCMS

Fig.6 Liquid temperature changes with spray temperature

Fig.7 Change of fluid and air energy with spray temperature

Fig.8 The change of air inlet and outlet enthalpy with spray temperature

Fig.9 MPCMS equivalent specific heat capacity and temperature variation

Fig.10 The change of Le with temperature

References 33

1	Rao Z H, Qian Z, Kuang Y, et al. Thermal performance of liquid cooling based thermal management system for cylindrical lithium-ion battery module with variable contact surface[J]. Applied Thermal Engineering, 2017, 123: 1514-1522.
2	Erdemir D, Atesoglu H, Altuntop N. Experimental investigation on enhancement of thermal performance with obstacle placing in the horizontal hot water tank used in solar domestic hot water system[J]. Renewable Energy, 2019, 138: 187-197.
3	Serale G, Fabrizio E, Perino M. Design of a low-temperature solar heating system based on a slurry phase change material (PCS)[J]. Energy and Buildings, 2015, 106: 44-58.
4	Pandey A K, Hossain M S, Tyagi V V, et al. Novel approaches and recent developments on potential applications of phase change materials in solar energy[J]. Renewable and Sustainable Energy Reviews, 2018, 82: 281-323.
5	Al-Abidi A A, Bin Mat S, Sopian K, et al. Review of thermal energy storage for air conditioning systems[J]. Renewable and Sustainable Energy Reviews, 2012, 16(8): 5802-5819.
6	Trivedi G V N, Parameshwaran R. Microencapsulated phase change material suspensions for cool thermal energy storage[J]. Materials Chemistry and Physics, 2020, 242: 122519.
7	Inaba H, Zhang Y L, Horibe A, et al. Numerical simulation of natural convection of latent heat phase-change-material microcapsulate slurry packed in a horizontal rectangular enclosure heated from below and cooled from above[J]. Heat and Mass Transfer, 2007, 43(5): 459-470.
8	Inaba H, Zhang Y L, Horibe A. Transient heat storage characteristics on horizontal rectangular enclosures filled with fluidity slurry of micro-encapsulated phase-change-material dispersed in water[J]. Journal of Thermal Science and Technology, 2006, 1(2): 66-77.
9	Yuan Z Y, Liang K F, Xue Y H, et al. Experimental study of evaluation of dynamical utilization of a microencapsulated phase change material slurry based on temperature range matching analysis[J]. International Communications in Heat and Mass Transfer, 2022, 130: 105788.
10	Allouche Y, Varga S, Bouden C, et al. Experimental determination of the heat transfer and cold storage characteristics of a microencapsulated phase change material in a horizontal tank[J]. Energy Conversion and Management, 2015, 94: 275-285.
11	Zhang S, Niu J L. Two performance indices of TES apparatus: comparison of MPCM slurry vs. stratified water storage tank[J]. Energy and Buildings, 2016, 127: 512-520.
12	Xu H T, Miao Y B, Wang N, et al. Experimental investigations of heat transfer characteristics of MPCM during charging[J]. Applied Thermal Engineering, 2018, 144: 721-725.
13	Diaconu B M, Varga S, Oliveira A C. Experimental study of natural convection heat transfer in a microencapsulated phase change material slurry[J]. Energy, 2010, 35(6): 2688-2693.
14	Bai Z R, Miao Y B, Xu H T, et al. Experimental study on thermal storage and heat transfer performance of microencapsulated phase-change material slurry[J]. Thermal Science and Engineering Progress, 2020, 17: 100362.
15	卜令帅, 屈治国, 徐洪涛, 等. 相变微胶囊悬浮液储能系统放冷特性实验研究[J]. 化工学报, 2021, 72(8): 4064-4072.
	Bu L S, Qu Z G, Xu H T, et al. Experimental study of cooling discharging characteristics of the energy storage system filled with MPCM slurry[J]. CIESC Journal, 2021, 72(8): 4064-4072.
16	Kong M, Alvarado J L, Terrell W, et al. Performance characteristics of microencapsulated phase change material slurry in a helically coiled tube[J]. International Journal of Heat and Mass Transfer, 2016, 101: 901-914.
17	Sabbah R, Farid M M, Al-Hallaj S. Micro-channel heat sink with slurry of water with micro-encapsulated phase change material: 3D-numerical study[J]. Applied Thermal Engineering, 2009, 29(2/3): 445-454.
18	钟小龙, 刘东, 胥海伦. 微小管道内相变微胶囊悬浮液换热特性[J]. 化工学报, 2016, 67(S1): 203-209.
	Zhong X L, Liu D, Xu H L. Heat transfer characteristics of micro-encapsulated phase change material suspension in mini-tubes[J]. CIESC Journal, 2016, 67(S1): 203-209.
19	Liu L K, Alva G, Jia Y T, et al. Dynamic thermal characteristics analysis of microencapsulated phase change suspensions flowing through rectangular mini-channels for thermal energy storage[J]. Energy and Buildings, 2017, 134: 37-51.
20	Qiu Z Z, Li L. Experimental and numerical investigation of laminar heat transfer of microencapsulated phase change material slurry (MPCMS) in a circular tube with constant heat flux[J]. Sustainable Cities and Society, 2020, 52: 101786.
21	Ma F, Chen J, Zhang P. Experimental study of the hydraulic and thermal performances of nano-sized phase change emulsion in horizontal mini-tubes[J]. Energy, 2018, 149: 944-953.
22	Zhang Y L, Wang S F, Rao Z H, et al. Experiment on heat storage characteristic of microencapsulated phase change material slurry[J]. Solar Energy Materials and Solar Cells, 2011, 95(10): 2726-2733.
23	Wang X C, Niu J L, Li Y, et al. Flow and heat transfer behaviors of phase change material slurries in a horizontal circular tube[J]. International Journal of Heat and Mass Transfer, 2007, 50(13/14): 2480-2491.
24	Yamagishi Y, Sugeno T, Ishige T, et al. An evaluation of microencapsulated PCM for use in cold energy transportation medium[C]//IECEC 96. Proceedings of the 31st Intersociety Energy Conversion Engineering Conference. Washington, DC, USA: IEEE, 1996: 2077-2083.
25	Zhang X X, Fan Y F, Tao X M, et al. Crystallization and prevention of supercooling of microencapsulated n-alkanes[J]. Journal of Colloid and Interface Science, 2005, 281(2): 299-306.
26	Inaba H, Kim M J, Horibe A. Melting heat transfer characteristics of microencapsulated phase change material slurries with plural microcapsules having different diameters[J]. Journal of Heat Transfer, 2004, 126(4): 558-565.
27	Zhang Y P, Jiang Y, Jiang Y. A simple method, the-history method, of determining the heat of fusion, specific heat and thermal conductivity of phase-change materials[J]. Measurement Science and Technology, 1999, 10(3): 201-205.
28	Mar n J M, Zalba B N, Cabeza L F, et al. Determination of enthalpy temperature curves of phase change materials with the temperature-history method: improvement to temperature dependent properties[J]. Measurement Science and Technology, 2003, 14(2): 184-189.
29	Xu Z, Xiao Y H, Wang Y. Experimental and theoretical studies on air humidification by a water spray for humid air turbine cycle[C]//Proceedings of ASME Turbo Expo 2006: Power for Land, Sea, and Air. Barcelona, Spain, 2008: 385-393.
30	胡先旭, 张寅平. 等壁温条件下潜热型功能热流体换热强化机理的理论研究[J]. 太阳能学报, 2002, 23(5): 626-633.
	Hu X X, Zhang Y P. Theoretical analysis of the convective heat transfer enhancement of latent functionally thermal fluid with isothermal wall[J]. Acta Energiae Solaris Sinica, 2002, 23(5): 626-633.
31	张方, 胥建群, 黄喜军. 基于PCMS流动和传热特性凝汽器的节水节能研究[J]. 中国电机工程学报, 2017, 37(10): 2905-2912.
	Zhang F, Xu J Q, Huang X J. Research on water and energy conservation of the condenser based on characteristics of flow and heat transfer of PCMS[J]. Proceedings of the CSEE, 2017, 37(10): 2905-2912.
32	Xia Z Z, Chen C J, Wang R Z. Numerical simulation of a closed wet cooling tower with novel design[J]. International Journal of Heat and Mass Transfer, 2011, 54(11/12): 2367-2374.
33	Kloppers J C, Kröger D G. The Lewis factor and its influence on the performance prediction of wet-cooling towers[J]. International Journal of Thermal Sciences, 2005, 44(9): 879-884.

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