Role of surface effects in the determination of phase change temperature of PCMs

2021 ◽  
Author(s):  
Igor Medveď ◽  
Milan Jurči ◽  
Anton Trník
Keyword(s):  
Phase Change ◽  
Surface Effects ◽  
Phase Change Temperature ◽  
Change Temperature

Preparation of Biodegradable Phase-Change Refrigerant Used in Insulating Packaging

2012 ◽  
Vol 200 ◽  
pp. 437-441 ◽  
Author(s):  
Yun Zhang ◽  
Jing Qian ◽  
Feng Chen
Keyword(s):  
Phase Change ◽  
Water Absorption ◽  
Solution Concentration ◽  
Polymer Materials ◽  
Basic Material ◽  
High Polymer ◽  
Nacl Solution ◽  
Phase Change Temperature ◽  
Change Temperature

The starch grafted acrylic super absorbent resin was used as a basic material of refrigerant in insulating packaging. The influence of the amount of initiator on water absorption ability of starch grafted acrylic super absorbent resin was investigated. When the amount of initiator is 4 percent of the starch, the resin's water absorption that is 230g/g displays the best. By adding NaCl solution, the phase change temperature of refrigerant can be conditioned. The experimental results show that the phase change temperature and the latent heat of refrigerant decrease as the NaCl solution concentration increases. The starch grafted acrylic super absorbent resin and the NaCl solution with the concentration of 0~5 percent as refrigerant can be used to transport the products whose required temperatures is between -4 and 0°C. The starch grafted acrylic super absorbent resin can replace the ordinary high polymer materials, playing the role of being easily biodegradable and friendly to environment.

A Study on the Cooling Characteristics of TMA Clathrate Compound with Additives

2006 ◽  
Vol 326-328 ◽  
pp. 1275-1278 ◽  
Author(s):  
Chang Oh Kim ◽  
Jin Heung Kim ◽  
Nak Kyu Chung
Keyword(s):  
Heat Source ◽  
Phase Change ◽  
Specific Heat ◽  
Freezing Point ◽  
Phase Change Temperature ◽  
Source Temperature ◽  
Heat Source Temperature ◽  
Clathrate Compound ◽  
Supercooling Degree ◽  
Change Temperature

This study aims to find out cooling characteristics of TMA 25wt%-water clathrate compound with ethanol such as supercooling, phase change temperature and specific heat. For this purpose, ethanol is added as per weight concentration and cooling experiment is performed at -6, -7 and -8, cooling heat source temperature, and it leads the following result. (1) Phase change temperature is decreased due to freezing point depression phenomenon. Especially, it is minimized as 5.1 and 5.0, 3.8 according to cooling source temperature in case that 0.5wt% of ethanol is added. (2) If 0.5wt% of ethanol is added, average supercooling degree is 0.9 and minimum supercooling is 0.8, 0.7 according to cooling heat source temperature. The restraint effect of supercooling is shown. (3) Specific heat shows tendency to decrease if ethanol is added. It is 3.013~3.048 kJ/kgK according to cooling heat source temperature if 0.5wt% of ethanol is added. Phase change temperature higher than that of water and inhibitory effect against supercooling can be confirmed through experimental study on cooling characteristics of TMA 25wt%-water clathrate compound by adding additive, ethanol.

scholarly journals Experimental Study on Flow Characters of Salt Hydrate Slurry in Phase Change Temperature Range

2017 ◽  
Vol 21 (5) ◽  
pp. 15-23
Author(s):  
Muhammad Irsyad ◽  
Yuli S. Indartono ◽  
Ari D. Pasek ◽  
Willy Adriansyah
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Salt Hydrate ◽  
Phase Change Temperature ◽  
Temperature Range ◽  
Change Temperature

scholarly journals Effect of Ion Irradiation on Amorphous and Crystalline Ge–Se and Their Application as Phase Change Temperature Sensor

2020 ◽  
pp. 2000429
Author(s):  
Al-Amin Ahmed Simon ◽  
Lyle Jones ◽  
Yoshifumi Sakaguchi ◽  
Henri Kunold ◽  
Isabella van Rooyen ◽  
...  
Keyword(s):  
Phase Change ◽  
Temperature Sensor ◽  
Ion Irradiation ◽  
Phase Change Temperature ◽  
Change Temperature

Preparation and Thermal Propertites of Polyethylene Glycol/ Silica Hollow Nanospheres Composite as Shape-Stabilized Phase Change Materials

2013 ◽  
Vol 773 ◽  
pp. 534-537 ◽  
Author(s):  
Li Li Feng ◽  
Jing Jing Tong ◽  
Chong Yun Wang
Keyword(s):  
Thermal Properties ◽  
Polyethylene Glycol ◽  
Phase Change ◽  
Porous Structure ◽  
Phase Change Materials ◽  
Hollow Nanospheres ◽  
Lower Phase ◽  
Phase Change Temperature ◽  
Change Temperature ◽  
Change Material

Shape-stabilized phase change material (PCM) composed of polyethylene glycol and silica hollow nanospheres was prepared by a vacuum impregnating method. Thermal properties of the composite PCM were investigated by various techniques. Lower phase change temperature and enthalpy of the composite PCM were observed. It is concluded that the phase change properties of the composite PCM are influenced by the adsorption confinement of the PEG segments from the porous structure of the silica hollow nanospheres.

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