Experimental study on heat capacity of paraffin/water phase change emulsion

2010 ◽  
Vol 51 (6) ◽  
pp. 1264-1269 ◽  
Author(s):  
L. Huang ◽  
P. Noeres ◽  
M. Petermann ◽  
C. Doetsch
Keyword(s):  
Experimental Study ◽  
Heat Capacity ◽  
Phase Change ◽  
Water Phase

scholarly journals Experimental study and modelling of the water phase change kinetics in soils

2008 ◽  
Vol 59 (5) ◽  
pp. 939-949 ◽  
Author(s):  
A.-L. Lozano ◽  
F. Cherblanc ◽  
B. Cousin ◽  
J.-C. Bénet
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Water Phase

Theoretical and Experimental Study of a Water Phase-Change Solar Collector

2010 ◽  
Vol 41 (3) ◽  
pp. 283-297
Author(s):  
Ababacar Thiam ◽  
Youssouf Mandiang ◽  
Vincent Sambou ◽  
Dorothe Azilinon ◽  
Mamadou Adj
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Solar Collector ◽  
Water Phase

Improvement of Thermal Conductivity and Energy Stored by Paraffin with Different Metallic Additives

2020 ◽  
Vol 28 (03) ◽  
pp. 2050028
Author(s):  
Khaoula Missoum ◽  
Hocine Guellil ◽  
Abdel Illah Nabil Korti
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Heat Capacity ◽  
Phase Change ◽  
Thermal Energy ◽  
Perforated Plate ◽  
Melting Process ◽  
Effective Heat Capacity ◽  
Main Disadvantage ◽  
Change Material

Phase change thermal storage is an innovative and promising technology for saving energy. It is one of the new areas of research because it provides the solution to problems related between the provided and the required energies. Paraffin is a common phase change material (PCM) that used in many applications in thermal energy storage (TES) systems. However, the main disadvantage is their low thermal conductivities. However, using metallic additives to improve effective thermal conductivity of PCM can lead to decreasing effective heat capacity and the thermal energy stored. An experimental study is carried out to analyze the thermal behavior of the paraffin melting in a thermal cavity integrating different metals (zamak, aluminum and copper) with different configuration. The originality of study is to try to predict the best duo that respects both the improvement of thermal conductivity and energy stored. The experiments show that adding aluminum perforated plate in paraffin accelerates the melting process by about 19% and increases the energy stored by 5.18%.

Nitrous oxide fluxes related to soil freeze and thaw periods identified using heat pulse probes

2010 ◽  
Vol 90 (3) ◽  
pp. 409-418 ◽  
Author(s):  
C. Wagner-Riddle ◽  
J. Rapai ◽  
J. Warland ◽  
A. Furon
Keyword(s):  
Heat Capacity ◽  
Nitrous Oxide ◽  
Phase Change ◽  
Conventional Tillage ◽  
Heat Pulse ◽  
Tunable Diode Laser ◽  
Water Phase ◽  
No Tillage ◽  
Apparent Heat Capacity

Surface N2O fluxes have not been unequivocally linked to soil profile conditions, in particular the timing of water phase change. The heated needle probe is a sensor that has the potential to monitor in situ apparent volumetric heat capacity (Ca), which considers latent heat transfer, during freezing and thawing. The objective of this study was to relate the timing of N2O flux to the occurrence of soil water phase change between liquid and ice as determined by Ca in no-tillage (NT) and conventional tillage (CT) plots monitored from fall to spring. Half-hourly micrometeorological N2O fluxes were measured using a tunable diode laser trace gas analyzer. Apparent heat capacity was measured at 5-cm depth using three 4-cm-long parallel needles, two equipped with thermistors and one with a heater. Two N2O flux events were observed for CT in January, followed by the main emission event in early March. For NT, only one emission event occurred, with lower magnitude than the CT event, and a later starting and ending date. The apparent heat capacity measured in situ with HPP showed a different temporal pattern between NT and CT, with CT presenting more phase change events. Two out of the three N2O emission events in CT that occurred during winter and early spring occurred immediately after phase change from ice to liquid water at 5-cm depth. The N2O flux associated with the phase change during the main thaw event in CT was an exponential function of the soil surface temperature increasing sharply when T > 0°C, but with smaller fluxes once T was > 5°C. The temperature response observed is consistent with the suggestion of a breakdown in the N2O reduction process in the 0 to 5°C range, while the N2O production enzymes are less affected by low temperature.Key words: Nitrous oxide flux, freeze-thaw cycles, heat pulse probes, no-tillage, conventional tillage

Experimental Study on Thermal Characteristics of Finned Coil LHSU Using Paraffin as Phase Change Material

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Guansheng Chen ◽  
Nanshuo Li ◽  
Huanhuan Xiang ◽  
Fan Li
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Phase Change ◽  
Phase Change Material ◽  
Water Flow ◽  
Water Flow Rate ◽  
Thermal Characteristics ◽  
Heat Transfer Fluid ◽  
Latent Heat Storage ◽  
Change Material

It is well known that attaching fins on the tubes surfaces can enhance the heat transfer into and out from the phase change materials (PCMs). This paper presents the results of an experimental study on the thermal characteristics of finned coil latent heat storage unit (LHSU) using paraffin as the phase change material (PCM). The paraffin LHSU is a rectangular cube consists of continuous horizontal multibended tubes attached vertical fins at the pitches of 2.5, 5.0, and 7.5 mm that creates the heat transfer surface. The shell side along with the space around the tubes and fins is filled with the material RT54 allocated to store energy of water, which flows inside the tubes as heat transfer fluid (HTF). The measurement is carried out under four different water flow rates: 1.01, 1.30, 1.50, and 1.70 L/min in the charging and discharging process, respectively. The temperature of paraffin and water, charging and discharging wattage, and heat transfer coefficient are plotted in relation to the working time and water flow rate.

scholarly journals Testing a Gypsum Composite Based on Raw Gypsum with a Direct Admixture of Paraffin and Polymer to Improve Thermal Properties

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3241
Author(s):  
Krzysztof Powała ◽  
Andrzej Obraniak ◽  
Dariusz Heim
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Thermal Properties ◽  
Phase Change ◽  
Large Scale ◽  
Building Materials ◽  
Residential Buildings ◽  
Energy Performance ◽  
Polymer Content ◽  
Volumetric Heat Capacity

The implemented new legal regulations regarding thermal comfort, the energy performance of residential buildings, and proecological requirements require the design of new building materials, the use of which will improve the thermal efficiency of newly built and renovated buildings. Therefore, many companies producing building materials strive to improve the properties of their products by reducing the weight of the materials, increasing their mechanical properties, and improving their insulating properties. Currently, there are solutions in phase-change materials (PCM) production technology, such as microencapsulation, but its application on a large scale is extremely costly. This paper presents a solution to the abovementioned problem through the creation and testing of a composite, i.e., a new mixture of gypsum, paraffin, and polymer, which can be used in the production of plasterboard. The presented solution uses a material (PCM) which improves the thermal properties of the composite by taking advantage of the phase-change phenomenon. The study analyzes the influence of polymer content in the total mass of a composite in relation to its thermal conductivity, volumetric heat capacity, and diffusivity. Based on the results contained in this article, the best solution appears to be a mixture with 0.1% polymer content. It is definitely visible in the tests which use drying, hardening time, and paraffin absorption. It differs slightly from the best result in the thermal conductivity test, while it is comparable in terms of volumetric heat capacity and differs slightly from the best result in the thermal diffusivity test.

scholarly journals Experimental study and analysis of single slope solar still integrated with Phase Change Material

2021 ◽  
Vol 1059 (1) ◽  
pp. 012010 ◽  
Author(s):  
N Boopalan ◽  
B Kalidasan ◽  
D Raj Kumar ◽  
E Ragupathi ◽  
M Gurumoorthy ◽  
...  
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Phase Change Material ◽  
Solar Still ◽  
Change Material
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