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Lab-Scale Dynamic Thermal Testing of PCM-Enhanced Building Materials

2014 Building materials
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Release : 2014
Genre : Building materials
Kind : eBook
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Book Synopsis Lab-Scale Dynamic Thermal Testing of PCM-Enhanced Building Materials by : Nitin Shukla

Download or read book Lab-Scale Dynamic Thermal Testing of PCM-Enhanced Building Materials written by Nitin Shukla. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: Previous research studies have shown that incorporation of the phase-change material (PCM) in a building envelope material/component may bring significant reduction in the building energy consumption. A detailed knowledge of the key phase-transition (dynamic) properties, such as latent heat, sub-cooling, hysteresis during melting and freezing, etc., of the PCM-enhanced building materials is required to perform the whole building energy simulations and code work. In addition, the dynamic test data is critical in optimizing the distribution and location of the PCM within a building to maximize the energy savings. Until recently, the differential scanning calorimeter (DSC) has been the only available method to determine the dynamic properties of a PCM. Unfortunately, the DSC method is valid for small and homogeneous specimens, and is incapable of capturing the complexities observed in large-scale building components. Materials with non-uniform temperature distribution and non-homogeneity caused by the presence of additives, such as fire retardants, conduction inhibitors, and adhesives, cannot be analyzed by the DSC testing method. Dynamic heat-flow meter apparatus (DHFMA) is a recently developed method for dynamic property measurement of system-scale PCM and other building construction products. Although the DHFMA method is gaining acceptance among the scientific and research community, it is still under development. In this study, we focus on advancing the development, and conducting the validation of the DHFMA method. A detailed description of the DHFMA method is presented to highlight the difference with the conventional HFMA method. Next, a large-scale bio-based shape-stabilized PCM (ss-PCM) sample was tested using both DHFMA and DSC test methods. Specific heat as a function of temperature data measured by DHFMA method was found to be in very good agreement with slowest ramp and step data. This is the first direct verification of the HFMA method with the DSC method for PCMs.

PCM-Enhanced Building Components

2015-05-07 Technology & Engineering
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Release : 2015-05-07
Genre : Technology & Engineering
Kind : eBook
Book Rating : 860/5 ( reviews)

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Book Synopsis PCM-Enhanced Building Components by : Jan Kośny

Download or read book PCM-Enhanced Building Components written by Jan Kośny. This book was released on 2015-05-07. Available in PDF, EPUB and Kindle. Book excerpt: Presenting an overview of the use of Phase Change Materials (PCMs) within buildings, this book discusses the performance of PCM-enhanced building envelopes. It reviews the most common PCMs suitable for building applications, and discusses PCM encapsulation and packaging methods. In addition to this, it examines a range of PCM-enhanced building products in the process of development as well as examples of whole-building-scale field demonstrations. Further chapters discuss experimental and theoretical analyses (including available software) to determine dynamic thermal and energy performance characteristics of building enclosure components containing PCMs, and present different laboratory and field testing methods. Finally, a wide range of PCM building products are presented which are commercially available worldwide. This book is intended for students and researchers of mechanical, architectural and civil engineering and postgraduate students of energy analysis, dynamic design of building structures, and dynamic testing procedures. It also provides a useful resource for professionals involved in architectural and mechanical-civil engineering design, thermal testing and PCM manufacturing.

CRC Handbook of Thermal Engineering

2017-11-08 Science
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Release : 2017-11-08
Genre : Science
Kind : eBook
Book Rating : 29X/5 ( reviews)

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Book Synopsis CRC Handbook of Thermal Engineering by : Raj P. Chhabra

Download or read book CRC Handbook of Thermal Engineering written by Raj P. Chhabra. This book was released on 2017-11-08. Available in PDF, EPUB and Kindle. Book excerpt: The CRC Handbook of Thermal Engineering, Second Edition, is a fully updated version of this respected reference work, with chapters written by leading experts. Its first part covers basic concepts, equations and principles of thermodynamics, heat transfer, and fluid dynamics. Following that is detailed coverage of major application areas, such as bioengineering, energy-efficient building systems, traditional and renewable energy sources, food processing, and aerospace heat transfer topics. The latest numerical and computational tools, microscale and nanoscale engineering, and new complex-structured materials are also presented. Designed for easy reference, this new edition is a must-have volume for engineers and researchers around the globe.

Thermal Conductivity 31/Thermal Expansion 19

2013-05-02 Science
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Release : 2013-05-02
Genre : Science
Kind : eBook
Book Rating : 556/5 ( reviews)

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Book Synopsis Thermal Conductivity 31/Thermal Expansion 19 by : Laszlo Kiss

Download or read book Thermal Conductivity 31/Thermal Expansion 19 written by Laszlo Kiss. This book was released on 2013-05-02. Available in PDF, EPUB and Kindle. Book excerpt: New volume in the ITCC/ITES book series on thermal conductivity. Papers include applications related to thermophysical properties measurement methods, equipment, processes, theory, and new developments.

Theoretical and Experimental Thermal Performance Analysis of Complex Thermal Storage Membrane Containing Bio-Based Phase Change Material (PCM).

2010
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Release : 2010
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Book Synopsis Theoretical and Experimental Thermal Performance Analysis of Complex Thermal Storage Membrane Containing Bio-Based Phase Change Material (PCM). by :

Download or read book Theoretical and Experimental Thermal Performance Analysis of Complex Thermal Storage Membrane Containing Bio-Based Phase Change Material (PCM). written by . This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt: Since 2000, an ORNL research team has been testing different configurations of PCM-enhanced building envelop components to be used in residential and commercial buildings. During 2009, a novel type of thermal storage membrane was evaluated for building envelope applications. Bio-based PCM was encapsulated between two layers of heavy-duty plastic film forming a complex array of small PCM cells. Today, a large group of PCM products are packaged in such complex PCM containers or foils containing arrays of PCM pouches of different shapes and sizes. The transient characteristics of PCM-enhanced building envelope materials depend on the quality and amount of PCM, which is very often difficult to estimate because of the complex geometry of many PCM heat sinks. The only widely used small-scale analysis method used to evaluate the dynamic characteristics of PCM-enhanced building products is the differential scanning calorimeter (DSC). Unfortunately, this method requires relatively uniform, and very small, specimens of the material. However, in numerous building thermal storage applications, PCM products are not uniformly distributed across the surface area, making the results of traditional DSC measurements unrealistic for these products. In addition, most of the PCM-enhanced building products contain blends of PCM with fire retardants and chemical stabilizers. This combination of non-uniform distribution and non-homogenous composition make it nearly impossible to select a representative small specimen suitable for DSC tests. Recognizing these DSC limitations, ORNL developed a new methodology for performing dynamic heat flow analysis of complex PCM-enhanced building materials. An experimental analytical protocol to analyze the dynamic characteristics of PCM thermal storage makes use of larger specimens in a conventional heat-flow meter apparatus, and combines these experimental measurements with three-dimensional (3-D) finite-difference modeling and whole building energy simulations. Based on these dynamic tests and modeling, ORNL researchers then developed a simplified one-dimensional (1-D) model of the PCM-enhanced building component that can be easily used in whole-building simulations. This paper describes this experimental-analytical methodology as used in the analysis of an insulation assembly containing a complex array of PCM pouches. Based on the presented short example of whole building energy analysis, this paper describes step-by-step how energy simulation results can be used for optimization of PCM-enhanced building envelopes. Limited results of whole building energy simulations using the EnergyPlus program are presented as well.

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