Dynamics of energy storage in phase change drywall systems

Darkwa, K; Kim, J.-S.

doi:10.1002/er.1062

Cited by 48 publications

(11 citation statements)

References 9 publications

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“…This was attributed to reduction in the porosity of the MEPCM. Darkwa and Kim [101] developed an effective thermal conductivity testing rig in accordance with ISO 8301 Standards and used it to determine the thermal conductivity of a composite MEPCM sample as shown in Fig. 15.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

777

267

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Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition, they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles was identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs. Abstract: Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles were identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs.

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Section: Thermal Conductivitymentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

777

267

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“…Since European and Spanish standard UNE EN 13279 sets the minimum at 2 MPa, all the samples tested would be apt for use in construction: 19 Tabla 5 / Table 5 Comparativa de la resistencia a compresión para diferentes compuestos fabricados con materiales de cambio de fase.…”

Section: Compressive Strengthunclassified

Caracterización física y mecánica de placas de yeso con materiales de cambio de fase incorporados para almacenamiento de energía térmica mediante calor latente

Oliver-Ramírez¹,

García-Santos²,

Neila-González³

2011

Mater. construcc.

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RESUMENEn esta investigación se ha diseñado y fabricado un panel de escayola que incorpora un 45% en peso de material de cambio de fase, manteniendo las propiedades físicas y mecánicas exigidas en la normativa de aplicación para yesos de construcción (UNE EN 13279 y referencias a la RY 85). Así, un panel de 1,0 m 2 y 1,5 cm de espesor, contiene 4,75 kg de PCM, cantidad muy superior a la conseguida hasta la fecha (3 kg/m 2 ). Para ello se ha mejorado previamente sus prestaciones mecánicas y físicas mediante adiciones binarias: fibras de polipropileno y dispersión de melanina formaldehído.Este porcentaje es capaz de almacenar en 1,5 cm de espesor cinco veces la energía térmica de un panel de cartón yeso con el mismo espesor y la misma cantidad que una fábrica de 1/2 pie de ladrillo hueco, en el rango de temperaturas próximas a la de confort (20-30 ºC).Palabras clave: yeso, PCM, energía térmica, almacenamiento, calor latente, propiedades físicas, propiedades mecánicas. SUMMARYThis article describes the design and manufacture of a gypsum board which, despite its 45 % wt content of phase change materials, meets the minimum physical and mechanical requirements laid down in the legislation on gypsum plasters (Spanish and European standard UNE EN 13279 and Spanish specifications for gypsum acceptance, RY 85). Under this design, a one-metre square, 1.5-cm thick board contains 4.75 kg of PCM, much more than in any prior drylining (the maximum attained to date is 3 kg per m 2 ). The mechanical and physical characteristics of this new composite were previously improved with two joint-action additives: polypropylene fibres and melamine formaldehyde as a dispersing agent.In the 20-30 ºC temperature range, a gypsum board 1.5 cm thick containing this percentage of PCMs can store five times more thermal energy than conventional plasterboard of the same thickness, and the same amount of energy as half-foot hollow brick masonry.Keywords: gypsum, PCM, thermal energy, storage, latent heat, physical properties, mechanical properties. INTRODUCCIÓNFrente al problema de crisis energética mundial que arrastramos desde el siglo pasado y el futuro incierto que nos depara, se está trabajando en las últimas décadas en pro de la reducción del consumo energético y del uso de fuentes de energía renovables. Ligado al uso de energías renovables está el concepto de almacenamiento energético, que permite ajustar los periodos de suministro a los de demanda, garantizando una mayor eficiencia energética.El almacenamiento térmico ha estado ligado a la arquitectura desde la antigüedad y se ha mantenido en las construcciones vernáculas, donde los cerramientos de gran inercia térmica garantizaban una temperatura prác-ticamente constante a lo largo del día, lo que significa una gran contribución a la mejora de las condiciones de habitabilidad y confort del espacio habitable y una reducción del uso de sistemas de calefacción y refrigeración.Existen otras alternativas a este modo de almacenamiento térmico en forma de calor sensible, que son el almacenamient...

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“…Above all they possess relatively low thermal conductivities and do display poor thermal response factor when combined with other construction materials [15][16][17]. Even though other investigations [18][19][20][21][22][23] …”

Section: Introductionmentioning

confidence: 99%