Heat Storage Experiment of the Microencapsulated Phase Change Material Slurry in a Horizontal Rectangular Tank

2011 ◽  
Vol 214 ◽  
pp. 662-667
Author(s):  
Yan Lai Zhang ◽  
Zhong Hao Rao ◽  
Jie Fei Xie ◽  
Shuang Feng Wang
Keyword(s):  
Heat Capacity ◽  
Natural Convection ◽  
Phase Change ◽  
Phase Change Material ◽  
Mass Concentration ◽  
Heat Storage ◽  
Heating Wall ◽  
Microencapsulated Phase Change Material ◽  
Change Material ◽  
Peak Value

Heat storage experiment by natural convection in rectangular tanks heated from below has been conducted with fluidity slurry composed of microencapsulated phase change material (PCM). The slurry shows a peak value in the specific heat capacity with latent heat at the temperature of about T = 31 °C. The effects of the heating wall temperature TH, the PCM mass concentration Cm of the PCM slurry and the height H of the tank on heat storage are revealed, respectively.

Fluid Flow and Heat Transfer Characteristics of Microencapsulated Phase Change Material Slurry in Turbulent Flow

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Hessam Taherian ◽  
Jorge L. Alvarado ◽  
Kalpana Tumuluri ◽  
Curt Thies ◽  
Chan-Hyun Park
Keyword(s):  
Heat Transfer ◽  
Heat Capacity ◽  
Fluid Flow ◽  
Turbulent Flow ◽  
Phase Change ◽  
Phase Change Material ◽  
Flow Conditions ◽  
Microencapsulated Phase Change Material ◽  
Change Material ◽  
Turbulent Flow Conditions

Microencapsulated phase change material (MPCM) slurry is consisted of a base fluid in which MPCM is dispersed. Due to apparent high heat capacity associated with phase change process, MPCM slurry can be used as a viable heat transfer fluid (HTF) for turbulent flow conditions. Heat transfer and fluid flow properties of the slurry in turbulent flow (3000 < Re < 6000) were determined experimentally. Dynamic viscosity of the MPCM slurry was measured at different temperatures close to the melting point of the material (20–30 °C). Pressure drop measurements under turbulent flow conditions were recorded for 6 MPCM samples at various concentrations. The pressure drop of the MPCM slurry was comparable to that of water despite the higher viscosity of the slurry. The effect of heat flux, MPCM mass concentration, flow rate and the type of phase change material was investigated. The effective heat capacity of slurry at the location where phase change occurs was found to be considerably higher than that of water. A nondimensional Nusselt number correlation was proposed in order to facilitate design of heat transfer loops with MPCM slurries as working fluid.

Numerical Simulation for Heat Storage Study of the Microencapsulated Phase Change Material Slurry in a Horizontal Rectangular Enclosure

2012 ◽  
Vol 455-456 ◽  
pp. 278-283
Author(s):  
Yan Lai Zhang ◽  
Zhong Hao Rao ◽  
Jie Fei Xie ◽  
Hong Zhang ◽  
Shuang Feng Wang
Keyword(s):  
Numerical Simulation ◽  
Phase Change ◽  
Phase Change Material ◽  
Heat Storage ◽  
Temperature Range ◽  
Rectangular Enclosure ◽  
Storage Study ◽  
Microencapsulated Phase Change Material ◽  
Phase Temperature ◽  
Change Material

Two-dimensional numerical simulation of heat storage characteristics in a horizontal rectangular enclosure heated from below by natural convection has been investigated with the microencapsulated phase change material (PCM) slurry. Effects of PCM on heat storage and heat transfer are discussed, in which PCM slurry exhibits the pseudoplastic non-Newtonian fluid behavior and a peak value in the specific heat capacity with latent heat in phase temperature range. And their characteristics between the slurries with and without phase change of PCM are compared in the phase change temperature range. And vertical temperature distributions at the middle position are given. This paper shows streamlines and isotherms in the enclosure for phase change process.

scholarly journals Impregnation of Wood with Microencapsulated Bio-Based Phase Change Materials for High Thermal Mass Engineered Wood Flooring

2018 ◽  
Vol 8 (12) ◽  
pp. 2696 ◽  
Author(s):  
Damien Mathis ◽  
Pierre Blanchet ◽  
Véronic Landry ◽  
Philippe Lagière
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Sugar Maple ◽  
Heat Storage ◽  
Red Oak ◽  
Thermal Mass ◽  
Microencapsulated Phase Change Material ◽  
Wood Flooring ◽  
Engineered Wood ◽  
Change Material

Wood is a porous material that can be impregnated and have enhanced properties. Two species of hardwood, red oak (Quercus rubra L.) and sugar maple (Acer saccharum Marsh.), were impregnated in a reactor with a microencapsulated phase change material. The objective was to enhance the thermal mass of wood boards used as surface layers for engineered wood flooring manufacturing. Preliminary experiments were conducted on small samples in order to define suitable impregnation parameters, based on the Bethell cycle. Thin wood boards were impregnated with a microencapsulated phase change material dispersed into distilled water. Several cycles of pressure were applied. Heating storage of the impregnated wood boards was determined using a dynamic heat flow meter apparatus method. A latent heat storage of 7.6 J/g over 3 °C was measured for impregnated red oak samples. This corresponds to a heat storage enhancement of 77.0%. Sugar maple was found to be harder to impregnate and thus his thermal enhancement was lower. Impregnated samples were observed by reflective optical microscopy. Microcapsules were found mainly in the large vessels of red oak, forming aggregates. Pull-off tests were conducted on varnished samples to assess the influence of an impregnation on varnish adhesion and no significant influence was revealed. Engineered wood flooring manufactured with impregnated boards such as characterized in this study could store solar energy and thus improve buildings energy efficiency. Although wood is a material with a low-conductivity, the thermal exchange between the PCM and the building air could be good enough as the microcapsules are positioned in the surface layer. Furthermore, flooring is an area with frequent sunrays exposure. Such high thermal mass EWF could lead to energy savings and to an enhancement of occupant’s thermal comfort. This study aimed to characterize the potential of impregnation with MPCM of two wood species in order to make high thermal mass EWF.

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