Innovative cool roofing membrane with integrated phase change materials: Experimental characterization of morphological, thermal and optic-energy behavior

Abstract The capability of Phase Change Materials (PCMs) to improve indoor thermal comfort conditions and reduce cooling energy demand when included in building components is widely acknowledged. In particular, the possibility to integrate PCMs in building envelopes for latent heat storage has been largely investigated in the last decades. This study deals with the development and prototyping of an innovative cool polyurethane based membrane with PCMs inclusion for roofing applications. The thermal-optical properties of such membrane are determined through laboratory analyses. Additionally, calorimetry and nanoscale morphological tests are carried out in order to verify the effectiveness of PCM inclusion into the medium and to define the thermal storage/release potential of PCMs with transition points at 25 °C and 55 °C. The composite membrane showed good workability properties even with high (i.e. 35%) PCM concentration. Optical properties were modified in the superficial layer by PCM inclusion, meaning that a further non-composite finishing layer of polyurethane is required to complete the field application of the new building material. Also, a promising thermal behavior and a consistent and effective increase of phase change enthalpy was registered with increasing PCM concentration within the polyurethane membrane. Therefore, the combination of cool materials and thermal storage effect produced promising results as passive technique for building thermal-energy efficiency, also highlighted by the relatively simple production process of the shape stabilized PCM inclusion.

[1]  Hongfa Di,et al.  Application of latent heat thermal energy storage in buildings: State-of-the-art and outlook , 2007 .

[2]  H. Akbari,et al.  The long-term effect of increasing the albedo of urban areas , 2012 .

[3]  José Luis Valverde,et al.  Development of smart gypsum composites by incorporating thermoregulating microcapsules , 2014 .

[4]  M Yamazaki,et al.  Thermal and structural characterization of trimethylolethane trihydrate , 2002 .

[5]  Ahmet Sarı,et al.  Form-stable paraffin/high density polyethylene composites as solid–liquid phase change material for thermal energy storage: preparation and thermal properties , 2004 .

[6]  Ali G. Touchaei,et al.  Modeling and labeling heterogeneous directional reflective roofing materials , 2014 .

[7]  Nihal Sarıer,et al.  Thermal characteristics of polyurethane foams incorporated with phase change materials , 2007 .

[8]  G. Fang,et al.  Preparation and thermal properties of n-octadecane/molecular sieve composites as form-stable thermal energy storage materials for buildings , 2012 .

[9]  L. Cabeza,et al.  Study on differential scanning calorimetry analysis with two operation modes and organic and inorganic phase change material (PCM) , 2013 .

[10]  M. K. Rathod,et al.  Thermal stability of phase change materials used in latent heat energy storage systems: A review , 2013 .

[11]  Amar M. Khudhair,et al.  A review on phase change energy storage: materials and applications , 2004 .

[12]  Ahmet Sarı,et al.  Synthesis and characterization of micro/nano capsules of PMMA/capric–stearic acid eutectic mixture for low temperature-thermal energy storage in buildings , 2015 .

[13]  Mohammed M. Farid,et al.  A Review on Energy Conservation in Building Applications with Thermal Storage by Latent Heat Using Phase Change Materials , 2021, Thermal Energy Storage with Phase Change Materials.

[14]  M. Zinzi,et al.  Cool and green roofs. An energy and comfort comparison between passive cooling and mitigation urban heat island techniques for residential buildings in the Mediterranean region , 2012 .

[15]  Jose M. Marin,et al.  Verification of a T-history installation to measure enthalpy versus temperature curves of phase change materials , 2006 .

[16]  Fariborz Haghighat,et al.  Centralized latent heat thermal energy storage system: Model development and validation , 2013 .

[17]  J. Taylor,et al.  Toward mitigating urban heat island effects: Investigating the thermal-energy impact of bio-inspired retro-reflective building envelopes in dense urban settings , 2015 .

[18]  Luisa F. Cabeza,et al.  Use of microencapsulated PCM in concrete walls for energy savings , 2007 .

[19]  Keping Chen,et al.  Preparation and characterization of form-stable paraffin/polyurethane composites as phase change materials for thermal energy storage , 2014 .

[20]  H. Akbari,et al.  Estimating the effect of using cool coatings on energy loads and thermal comfort in residential buildings in various climatic conditions , 2007 .

[21]  D. Karamanis,et al.  Well-ordered nanoporous materials for low-temperature water phase changes and solar evaporative cooling , 2015 .

[22]  M. J. Richardson.  Quantitative aspects of differential scanning calorimetry , 1997 .

[23]  Ferdinando Salata,et al.  How high albedo and traditional buildings’ materials and vegetation affect the quality of urban microclimate. A case study , 2015 .

[24]  S. Gaffin,et al.  Positive effects of vegetation: urban heat island and green roofs. , 2011, Environmental pollution.

[25]  Harry Boyer,et al.  A thermal model for phase change materials in a building roof for a tropical and humid climate: Model description and elements of validation , 2014 .

[26]  M. Santamouris,et al.  Development and testing of PCM doped cool colored coatings to mitigate urban heat island and cool buildings , 2011 .

[27]  H. Akbari,et al.  Calculating energy-saving potentials of heat-island reduction strategies , 2005 .

[28]  Luisa F. Cabeza,et al.  Review on thermal energy storage with phase change: materials, heat transfer analysis and applications , 2003 .

[29]  Rongpu Zhang,et al.  A systematic investigation of the factors affecting the optical properties of near infrared transmitting cool non-white coatings , 2014 .

[30]  Giuseppe Peter Vanoli,et al.  Energy refurbishment of existing buildings through the use of phase change materials: Energy savings and indoor comfort in the cooling season , 2014 .

[31]  Anna Laura Pisello,et al.  Experimental in-lab and in-field analysis of waterproof membranes for cool roof application and urban heat island mitigation , 2016 .

[32]  Min Xiao,et al.  Thermal performance of a high conductive shape-stabilized thermal storage material , 2001 .

[33]  A. Synnefa,et al.  Development and testing of thermochromic coatings for buildings and urban structures , 2009 .

[34]  Fredrik Setterwall,et al.  Phase transition temperature ranges and storage density of paraffin wax phase change materials , 2004 .

[35]  D. Asimakopoulos.  Energy and Climate in the Urban Built Environment , 2001 .

[36]  Luisa F. Cabeza,et al.  Determination of the enthalpy of PCM as a function of temperature using a heat‐flux DSC—A study of different measurement procedures and their accuracy , 2008 .

[37]  V. V. Tyagi,et al.  PCM thermal storage in buildings: A state of art , 2007 .