Dispersion stability and thermophysical properties of microencapsulated phase change material slurry for liquid desiccant dehumidification

Xiaofeng Niu; Ruifeng Xia; Honglin Dong; Dandan Wang; Dichang Duan; Peng Gao; Risto Kosonen

doi:10.1016/j.enbuild.2021.110870

Dispersion stability and thermophysical properties of microencapsulated phase change material slurry for liquid desiccant dehumidification

Xiaofeng Niu, Ruifeng Xia, Honglin Dong, Dandan Wang, Dichang Duan, Peng Gao, Risto Kosonen

Department of Energy and Mechanical Engineering

Nanjing Tech University

Research output: Contribution to journal › Article › Scientific › peer-review

10 Citations (Scopus)

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Abstract

The dispersion stability and the thermophysical properties of the microencapsulated phase change material slurry (MPCMS) for liquid desiccant dehumidification were investigated experimentally. The results show that, the dispersion stability of the MPCMS can be improved greatly by adding surfactant. The maximum absorbency of MPCMS with polyoxyethylene sorbitan monooleate (Tween80) is 4.1 times that of MPCMS with cetyltrimethyl ammonium bromide (CTAB). The monolayer adsorption model is suitable for predicting the optimal mass content of surfactant with the maximum relative error of 13.3%. The thermal conductivity of MPCMS is lower than that of the base fluid and decreases with the increasing MicroPCMs concentration, when the mass fraction of MicroPCMs increases from 0% to 2.0% at the temperature of 20 °C and 40 °C, the thermal conductivity decreases by 25% and 14.8%, respectively. When the mass concentration of MicroPCMs is lower than 1.0%, the thermal conductivity of MPCMS keeps increase with the temperature rise. While the mass concentration of MicroPCMs ranges from 1.0% to 2.0%, the thermal conductivity of MPCMS increases firstly and then declines gradually. Moreover, an improved interfacial layer based thermal conductivity calculation correlation was proposed, in which the influence of temperature and concentration of MPCMS were considered, the maximum deviation and mean deviation between the calculated value and the experimental one are 5.62% and 1.85%, respectively. In the range of phase transformation temperature, the specific heat capacity of the slurry can be significantly improved by the MicroPCMs, the maximum specific heat capacity of the MPCMS reaches 2.3 times that of the pure lithium chloride aqueous solution. In addition, the effect of the mass concentration of MicroPCMs on the specific heat capacity is much greater than that of the temperature and the mass concentration of LiCl. The findings provide experimental foundation and guidance for the practical application of MPCMS in liquid desiccant dehumidification.

Original language	English
Article number	110870
Number of pages	13
Journal	Energy and Buildings
Volume	240
Early online date	9 Mar 2021
DOIs	https://doi.org/10.1016/j.enbuild.2021.110870
Publication status	Published - 1 Jun 2021
MoE publication type	A1 Journal article-refereed

Keywords

microencapsulated phase change material slurry
liquid desiccant
surfactant
dispersion stability
thermal conductivity
specific heat capacity

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10.1016/j.enbuild.2021.110870

ENG_Niu_et_al_Dispersion_stability_and_thermophysical_properties_Energy_and_BuildingsAccepted author manuscript, 922 KBLicence: CC BY-NC-ND

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title = "Dispersion stability and thermophysical properties of microencapsulated phase change material slurry for liquid desiccant dehumidification",

abstract = "The dispersion stability and the thermophysical properties of the microencapsulated phase change material slurry (MPCMS) for liquid desiccant dehumidification were investigated experimentally. The results show that, the dispersion stability of the MPCMS can be improved greatly by adding surfactant. The maximum absorbency of MPCMS with polyoxyethylene sorbitan monooleate (Tween80) is 4.1 times that of MPCMS with cetyltrimethyl ammonium bromide (CTAB). The monolayer adsorption model is suitable for predicting the optimal mass content of surfactant with the maximum relative error of 13.3%. The thermal conductivity of MPCMS is lower than that of the base fluid and decreases with the increasing MicroPCMs concentration, when the mass fraction of MicroPCMs increases from 0% to 2.0% at the temperature of 20 °C and 40 °C, the thermal conductivity decreases by 25% and 14.8%, respectively. When the mass concentration of MicroPCMs is lower than 1.0%, the thermal conductivity of MPCMS keeps increase with the temperature rise. While the mass concentration of MicroPCMs ranges from 1.0% to 2.0%, the thermal conductivity of MPCMS increases firstly and then declines gradually. Moreover, an improved interfacial layer based thermal conductivity calculation correlation was proposed, in which the influence of temperature and concentration of MPCMS were considered, the maximum deviation and mean deviation between the calculated value and the experimental one are 5.62% and 1.85%, respectively. In the range of phase transformation temperature, the specific heat capacity of the slurry can be significantly improved by the MicroPCMs, the maximum specific heat capacity of the MPCMS reaches 2.3 times that of the pure lithium chloride aqueous solution. In addition, the effect of the mass concentration of MicroPCMs on the specific heat capacity is much greater than that of the temperature and the mass concentration of LiCl. The findings provide experimental foundation and guidance for the practical application of MPCMS in liquid desiccant dehumidification.",

keywords = "microencapsulated phase change material slurry, liquid desiccant, surfactant, dispersion stability, thermal conductivity, specific heat capacity",

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T1 - Dispersion stability and thermophysical properties of microencapsulated phase change material slurry for liquid desiccant dehumidification

AU - Niu, Xiaofeng

AU - Xia, Ruifeng

AU - Dong, Honglin

AU - Wang, Dandan

AU - Duan, Dichang

AU - Gao, Peng

AU - Kosonen, Risto

PY - 2021/6/1

Y1 - 2021/6/1

N2 - The dispersion stability and the thermophysical properties of the microencapsulated phase change material slurry (MPCMS) for liquid desiccant dehumidification were investigated experimentally. The results show that, the dispersion stability of the MPCMS can be improved greatly by adding surfactant. The maximum absorbency of MPCMS with polyoxyethylene sorbitan monooleate (Tween80) is 4.1 times that of MPCMS with cetyltrimethyl ammonium bromide (CTAB). The monolayer adsorption model is suitable for predicting the optimal mass content of surfactant with the maximum relative error of 13.3%. The thermal conductivity of MPCMS is lower than that of the base fluid and decreases with the increasing MicroPCMs concentration, when the mass fraction of MicroPCMs increases from 0% to 2.0% at the temperature of 20 °C and 40 °C, the thermal conductivity decreases by 25% and 14.8%, respectively. When the mass concentration of MicroPCMs is lower than 1.0%, the thermal conductivity of MPCMS keeps increase with the temperature rise. While the mass concentration of MicroPCMs ranges from 1.0% to 2.0%, the thermal conductivity of MPCMS increases firstly and then declines gradually. Moreover, an improved interfacial layer based thermal conductivity calculation correlation was proposed, in which the influence of temperature and concentration of MPCMS were considered, the maximum deviation and mean deviation between the calculated value and the experimental one are 5.62% and 1.85%, respectively. In the range of phase transformation temperature, the specific heat capacity of the slurry can be significantly improved by the MicroPCMs, the maximum specific heat capacity of the MPCMS reaches 2.3 times that of the pure lithium chloride aqueous solution. In addition, the effect of the mass concentration of MicroPCMs on the specific heat capacity is much greater than that of the temperature and the mass concentration of LiCl. The findings provide experimental foundation and guidance for the practical application of MPCMS in liquid desiccant dehumidification.

AB - The dispersion stability and the thermophysical properties of the microencapsulated phase change material slurry (MPCMS) for liquid desiccant dehumidification were investigated experimentally. The results show that, the dispersion stability of the MPCMS can be improved greatly by adding surfactant. The maximum absorbency of MPCMS with polyoxyethylene sorbitan monooleate (Tween80) is 4.1 times that of MPCMS with cetyltrimethyl ammonium bromide (CTAB). The monolayer adsorption model is suitable for predicting the optimal mass content of surfactant with the maximum relative error of 13.3%. The thermal conductivity of MPCMS is lower than that of the base fluid and decreases with the increasing MicroPCMs concentration, when the mass fraction of MicroPCMs increases from 0% to 2.0% at the temperature of 20 °C and 40 °C, the thermal conductivity decreases by 25% and 14.8%, respectively. When the mass concentration of MicroPCMs is lower than 1.0%, the thermal conductivity of MPCMS keeps increase with the temperature rise. While the mass concentration of MicroPCMs ranges from 1.0% to 2.0%, the thermal conductivity of MPCMS increases firstly and then declines gradually. Moreover, an improved interfacial layer based thermal conductivity calculation correlation was proposed, in which the influence of temperature and concentration of MPCMS were considered, the maximum deviation and mean deviation between the calculated value and the experimental one are 5.62% and 1.85%, respectively. In the range of phase transformation temperature, the specific heat capacity of the slurry can be significantly improved by the MicroPCMs, the maximum specific heat capacity of the MPCMS reaches 2.3 times that of the pure lithium chloride aqueous solution. In addition, the effect of the mass concentration of MicroPCMs on the specific heat capacity is much greater than that of the temperature and the mass concentration of LiCl. The findings provide experimental foundation and guidance for the practical application of MPCMS in liquid desiccant dehumidification.

KW - microencapsulated phase change material slurry

KW - liquid desiccant

KW - surfactant

KW - dispersion stability

KW - thermal conductivity

KW - specific heat capacity

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U2 - 10.1016/j.enbuild.2021.110870

DO - 10.1016/j.enbuild.2021.110870

M3 - Article

SN - 0378-7788

VL - 240

JO - Energy and Buildings

JF - Energy and Buildings

M1 - 110870

ER -

Dispersion stability and thermophysical properties of microencapsulated phase change material slurry for liquid desiccant dehumidification

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Keywords

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