Experimental investigations on prototype heat storage units utilizing stable supercooling of sodium acetate trihydrate mixtures

Laboratory tests of two heat storage units based on the principle of stable supercooling of sodium acetate trihydrate (SAT) mixtures were carried out. One unit was filled with 199.5kg of SAT with 9% extra water to avoid phase separation of the incongruently melting salt hydrate. The other unit was filled with 220kg SAT mixture thickened with 1% carboxymethyl cellulose. The heat exchange capacity rate during the charging of the unit with the extra water was significantly higher than for the unit with the thickening agent due to the different levels of convection. The SAT mixtures in the units were stable and supercooled at indoor ambient temperatures for up to two months, after which the units were discharged. The energy discharged after solidification of the supercooled SAT and water mixture was 194kJ/kg in the first test cycle, dropping to 179kJ/kg after 20 test cycles. The energy discharged from the unit with SAT and the thickening agent after solidification was stable at 205kJ/kg over 6 test cycles.

[1]  Simon Furbo,et al.  Long term thermal energy storage with stable supercooled sodium acetate trihydrate , 2015 .

[2]  Simon Furbo,et al.  Heat storage based on a NaCH3COO water mixture for solar heating systems , 2012 .

[3]  Ruzhu Wang,et al.  A review of available technologies for seasonal thermal energy storage , 2014 .

[4]  Teresa McGrath,et al.  Net energy analysis of a solar combi system with Seasonal Thermal Energy Store , 2015 .

[5]  Silvana S. S. Cardoso,et al.  Solidification in heat packs: III. Metallic trigger , 2003 .

[6]  Peng Hu,et al.  Phase change performance of sodium acetate trihydrate with AlN nanoparticles and CMC , 2011 .

[7]  Atsushi Makino,et al.  Measurements of thermophysical properties of sodium acetate hydrate , 1995 .

[8]  Hans Müller-Steinhagen,et al.  New highly efficient regeneration process for thermochemical energy storage , 2013 .

[9]  P. Pinel,et al.  A review of available methods for seasonal storage of solar thermal energy in residential applications , 2011 .

[10]  J. Payá,et al.  Performance characterization of a PCM storage tank , 2014 .

[11]  Jianhua Fan,et al.  Laboratory test of a prototype heat storage module based on stable supercooling of sodium acetate trihydrate , 2015 .

[12]  Hans Müller-Steinhagen,et al.  Central solar heating plants with seasonal heat storage , 2010 .

[13]  Ha Herbert Zondag,et al.  Prototype thermochemical heat storage with open reactor system , 2013 .

[14]  Kenichi Ohsasa,et al.  Supercooling and Solidification Behavior of Phase Change Material , 2010 .

[15]  Hiroshi Kimura,et al.  Phase change stability of sodium acetate trihydrate and its mixtures , 1985 .

[16]  Daniel Castro-Fresno,et al.  Review of seasonal heat storage in large basins: Water tanks and gravel–water pits , 2010 .

[17]  Mats Westermark,et al.  Low-energy buildings and seasonal thermal energy storages from a behavioral economics perspective , 2013 .

[18]  J. Guion,et al.  Nucleation of sodium acetate trihydrate in thermal heat storage cycles , 1991 .

[19]  Luisa F. Cabeza,et al.  Corrosion of metal and metal alloy containers in contact with phase change materials (PCM) for potential heating and cooling applications , 2014 .

[20]  Silvana S. S. Cardoso,et al.  Solidification in heat packs: I. Nucleation rate , 2003 .

[21]  Ruzhu Wang,et al.  A review of promising candidate reactions for chemical heat storage , 2015 .

[22]  Soo-Jin Park,et al.  Thermal property and latent heat energy storage behavior of sodium acetate trihydrate composites containing expanded graphite and carboxymethyl cellulose for phase change materials , 2015 .

[23]  Simon Furbo,et al.  Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite , 2016 .

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

[25]  K. Sopian,et al.  Review of the application of phase change material for heating and domestic hot water systems , 2015 .

[26]  A. Inés Fernández,et al.  CO2 mitigation accounting for Thermal Energy Storage (TES) case studies , 2015 .

[27]  Y. Çengel.  Heat Transfer: A Practical Approach , 1997 .

[28]  John B. Shoven,et al.  I , Edinburgh Medical and Surgical Journal.

[29]  John Rekstad,et al.  Supercooling salt hydrates: Stored enthalpy as a function of temperature , 2006 .

[30]  Fariborz Haghighat,et al.  Thermal energy storage with phase change material—A state-of-the art review , 2014 .

[31]  Andreas Richter,et al.  Flow distribution in solar collectors with laminar flow conditions , 2002 .

[32]  Luisa F. Cabeza,et al.  Immersion corrosion tests on metal‐salt hydrate pairs used for latent heat storage in the 32 to 36°C temperature range , 2001 .

[33]  Fariborz Haghighat,et al.  Impact of phase change materials types and positioning on hot water tank thermal performance: Using measured water demand profile , 2014 .

[34]  Mario A. Medina,et al.  Experimental observations on the heat transfer enhancement caused by natural convection during melting of solid–liquid phase change materials (PCMs) , 2016 .

[35]  Christ Glorieux,et al.  Tuning of thermal properties of sodium acetate trihydrate by blending with polymer and silver nanoparticles , 2014 .