TY - JOUR
T1 - Figure of merit for the thermal performance of cementitious composites containing phase change materials
AU - Thiele, Alexander M.
AU - Wei, Zhenhua
AU - Falzone, Gabriel
AU - Young, Benjamin A.
AU - Neithalath, Narayanan
AU - Sant, Gaurav
AU - Pilon, Laurent
N1 - Funding Information:
This manuscript was prepared as a result of work sponsored by the California Energy Commission (Contract: PIR:-12-032), the National Science Foundation (CMMI: 1130028 ) and the University of California , Los Angeles (UCLA). It does not necessarily represent the views of the Energy Commission, its employees, the State of California, or the National Science Foundation. The Energy Commission, the State of California, its employees, contractors, and subcontractors make no warranty, express or implied, and assume no legal liability for the information in this document; nor does any party represent that the use of this information will not infringe upon privately owned rights. This manuscript has not been approved or disapproved by the California Energy Commission nor has the California Energy Commission passed upon the accuracy or adequacy of the information in this paper. GNS would like to acknowledge discretionary support for this research provided by the Edward K. and Linda L. Rice Endowed Chair in Materials Science.
Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - This paper presents a novel method to quantitatively characterize the thermal performance of composite materials containing phase change materials (PCM) based on a figure of merit we termed the energy indicator. The method features (i) commonly used specimen geometry, (ii) straightforward experimental implementation, and (iii) sensitivity to relevant design parameters including PCM volume fraction, enthalpy of phase change, composite effective thermal conductivity, and specimen dimensions. The experimental method and the concept of energy indicator were demonstrated on PCM-mortar composites using various volume fractions of two commercial microencapsulated PCMs. This was supported by transient two-dimensional heat transfer simulations. The energy indicator was shown to increase linearly with increasing microencapsulated PCM volume fraction and latent heat of fusion and quadratically with the specimen radius. This figure of merit can be used to rapidly screen and select microencapsulated PCM composite materials for energy efficient buildings or crack-resistant concretes.
AB - This paper presents a novel method to quantitatively characterize the thermal performance of composite materials containing phase change materials (PCM) based on a figure of merit we termed the energy indicator. The method features (i) commonly used specimen geometry, (ii) straightforward experimental implementation, and (iii) sensitivity to relevant design parameters including PCM volume fraction, enthalpy of phase change, composite effective thermal conductivity, and specimen dimensions. The experimental method and the concept of energy indicator were demonstrated on PCM-mortar composites using various volume fractions of two commercial microencapsulated PCMs. This was supported by transient two-dimensional heat transfer simulations. The energy indicator was shown to increase linearly with increasing microencapsulated PCM volume fraction and latent heat of fusion and quadratically with the specimen radius. This figure of merit can be used to rapidly screen and select microencapsulated PCM composite materials for energy efficient buildings or crack-resistant concretes.
KW - Cement
KW - Characterization
KW - Cracking
KW - Energy efficient building
KW - Microencapsulated
KW - Phase change materials
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U2 - 10.1016/j.cemconcomp.2015.10.023
DO - 10.1016/j.cemconcomp.2015.10.023
M3 - Article
AN - SCOPUS:84947286731
SN - 0958-9465
VL - 65
SP - 214
EP - 226
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -