Thermodynamic properties and phase transitions of salt hydrates between 270 and 400 K III. CH3CO2Na·3H2O, CH3CO2Li·2H2O, and (CH3CO2)2Mg·4H2O

Meisingset, Knut Kristian; Grønvold, Fredrik

doi:10.1016/0021-9614(84)90003-x

Cited by 25 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Shin et al investigated the combination of CMC and expanded graphite as additives for SAT and found that composites with 2.5 wt% EG and 5 wt% CMC had a thermal conductivity of 1.85 W/m K [21]. Meisingset and Grønvold investigated thermodynamic properties of salt hydrates and suggested that 0.5% to 1% xanthan rubber can solve the problem of phase separation in SAT [22]. A suitable thickening agent could both solve phase separation and keep small sized conduction enhancers evenly distributed in the PCM composite at the temperature the storage is meant to operate at and over its lifetime.…”

Section: Phase Separation and Additivesmentioning

confidence: 99%

Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite

Dannemand

Furbo

2016

Solar Energy Materials and Solar Cells

View full text Add to dashboard Cite

Section: Phase Separation and Additivesmentioning

confidence: 99%

Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite

Dannemand

Furbo

2016

Solar Energy Materials and Solar Cells

View full text Add to dashboard Cite

“…The precipitated sodium acetate will then stay suspended in the thickened supercooled solution and will not settle to the bottom. In this case the sodium acetate can recombine with the nearby water molecules at crystallization to form SAT [21]. However, the heat transfer in a PCM storage is affected by the convection in the PCM as elucidated by Sun et al and may be reduced when the viscosity increases [22].…”

Section: Sodium Acetate Trihydrate Compositesmentioning

confidence: 94%

Experimental investigations on cylindrical latent heat storage units with sodium acetate trihydrate composites utilizing supercooling

2016

View full text Add to dashboard Cite

h i g h l i g h t sThermal energy storage units with supercooled of sodium acetate trihydrate are characterized. Heat exchange capacity rates were lower for units with PCM with thickening agents. Phase separation of sodium acetate trihydrate was avoided by thickening agent. a b s t r a c t Latent heat storage units utilizing stable supercooling of sodium acetate trihydrate (SAT) composites were tested in a laboratory. The stainless steel units were 1.5 m high cylinders with internal heat exchangers of tubes with fins. One unit was tested with 116 kg SAT with 6% extra water. Another unit was tested with 116.3 kg SAT with 0.5% Xanthan rubber as a thickening agent and 4.4% graphite powder. The heat exchange capacity rate during charge was significantly lower for the unit with SAT and Xanthan rubber compared to the unit with SAT and extra water. This was due to less convection in the thickened phase change material after melting. The heat content in the fully charged state and the heat released after solidification of the supercooled SAT mixtures at ambient temperature was higher for the unit with the thickened SAT mixture. The heat discharged after solidification of the supercooled SAT with extra water decreased over repeating charge and discharge cycles while the heat discharged from the SAT with Xanthan rubber remained stable. In both units, the solidification started spontaneously in the majority of the test cycles. This was due to the design of the unit or the method for handling the expansion and contraction of the SAT during charge and discharge.

show abstract

“…According to the literature [3], the heat capacity of solid SAT (whose molecular weight is 136.08 g mol −1 ) at constant pressure is c P = 229.0 J mol …”

Section: Data In the Literaturementioning

confidence: 99%

“…A disturbance induces salt to crystallize and the final temperature, t f , was measured. For m W = 20 g, in order to know m D (t f ) after crystallization, we insert each final experimental temperature t f , given in table 3, in the solubility equation, equation (3). Then, using equation (1), m S (t f ) was obtained.…”

Section: The Experimentsmentioning

confidence: 99%

“…To obtain the SAT-water solubility curve we introduced 20 cm 3 of distilled water in a test tube, which was placed inside a thermostat, and measured the mass of dissolved SAT 3 . When a small crystal remains undissolved at the bottom of the test tube, the mass which remains from a previously known amount is measured in order to obtain the dissolved mass.…”

Section: Solubility Curvementioning

confidence: 99%

See 1 more Smart Citation

Quantitative experiments on supersaturated solutions for the undergraduate thermodynamics laboratory

Güémez

Fiolhais

2004

Eur. J. Phys.

View full text Add to dashboard Cite

show abstract

Thermodynamic properties and phase transitions of salt hydrates between 270 and 400 K III. CH3CO2Na·3H2O, CH3CO2Li·2H2O, and (CH3CO2)2Mg·4H2O

Cited by 25 publications

References 14 publications

Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite

Solidification behavior and thermal conductivity of bulk sodium acetate trihydrate composites with thickening agents and graphite

Experimental investigations on cylindrical latent heat storage units with sodium acetate trihydrate composites utilizing supercooling

Quantitative experiments on supersaturated solutions for the undergraduate thermodynamics laboratory

Contact Info

Product

Resources

About