Heat transfer performance of paraffin wax based phase change materials applicable in building industry. (25th August 2016)

• Record Type: Journal Article
• Authors: Sobolčiak, Patrik; Abdelrazeq, Haneen; Özerkan, Nesibe Gözde; Ouederni, Mabrouk; Nógellová, Zuzana; AlMaadeed, Mariam A.; Karkri, Mustapha; Krupa, Igor
• Is Part Of: Applied thermal engineering. Volume 107(2016:Aug.)
• Page Start: 1313
• Page End: 1323
• Publication Date: 2016-08-25
• Subjects: a.u. arbitrary unit -- cp specific heat capacity of the specimen (kJ/kg·°C) -- DSC differential scanning calorimetry -- e thickness of specimen (m) -- EG expanded graphite -- Lm latent heat of melting (kJ/kg or J/g) -- LCA life cycle assessment -- LLDPE linear low density polyethylene -- nd not determinate -- PCM phase change material -- Qs heat sensible (kJ/kg or J/g) -- Qtotal heat total (kJ/kg or J/g) -- SSPCM shape stabilized phase change materials -- W paraffin wax rt 25 -- T temperature (°C or K) -- Tinit initial temperature (°C or K) -- Tend temperature on the end of measurement (°C or K) -- Tm melting temperature -- TGHPT transient guarded hot plate technique -- ΔH melting enthalpy (kJ/kg or J/g) -- λ thermal conductivity (W/m·K) -- ρ density (kg/cm3); Phase change materials -- Paraffin wax -- Expanded graphite -- Thermal conductivity -- Storage and release of thermal energy; Heat engineering -- Periodicals; Heating -- Equipment and supplies -- Periodicals; Periodicals; 621.40205
• DOI: 10.1016/j.applthermaleng.2016.07.050
• Languages: English
• ISSNs: 1359-4311

Abstract

Graphical abstract: Highlights: Thermal characterization of PCMs based on paraffin wax was accomplished. PCMs were able to store and release large amount of thermal energy. Thermal conductivity of PCMs increases 4 times by adding 15 wt.% of graphite. Abstract: Thermal characterization of phase change materials (PCMs) compose of linear low-density polyethylene (LLDPE), paraffin wax (W) with a melting point of 25 °C, and expanded graphite (EG), that are highly effective in thermal energy storage systems in the building industry, is reported. Thermal investigation of PCMs with various compositions of LLDPE, W and EG has been performed by nonconventional transient guarded hot plane technique (TGHPT) and compared with conventional differential scanning calorimetry (DSC) measurements. An excellent agreement in determination of thermal characteristics by both methods was found. The highest values of the total amount of stored energy, sensible heat for solid and liquid states (Qtotal, Qs (solid) and Qs (liquid), respectively) were found for the PCMs with composition LLDPE/W/EG = 40/50/10 and 35/50/15 w/w/w. Moreover, thermal conductivity and diffusivity of PCMs have been significantly improved by adding EG. Additionally, life cycle assessment was performed to evaluate the environmental impact of three different materials as glass wool, rock wool and PCM used with brick wall.