On-orbit absolute temperature calibration using multiple phase change materials: overview of recent technology advancements

2010 ◽  
Author(s):  
Fred A. Best ◽  
Douglas P. Adler ◽  
Claire Pettersen ◽  
Henry E. Revercomb ◽  
John H. Perepezko
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Absolute Temperature ◽  
Temperature Calibration ◽  
Multiple Phase

Experimental investigations of a solar dryer with and without multiple phase change materials (PCM’s)

2016 ◽  
Vol 13 (3) ◽  
pp. 210-217 ◽  
Author(s):  
T.S. Sreerag ◽  
K.S. Jithish
Keyword(s):  
Energy Storage ◽  
Melting Point ◽  
Phase Change ◽  
Phase Change Materials ◽  
Drying Process ◽  
Absorber Plate ◽  
Content Type ◽  
Air Heater ◽  
Multiple Phase ◽  
Solar Dryer

Purpose This paper aims to present a comparative study of a solar dryer with and without multiple phase change materials (PCMs). It also involves designing and fabricating the experimental model of an indirect solar dryer which uses PCMs for thermal energy storage. Design/methodology/approach A corrugated aluminium sheet is used as an absorber plate. Aluminium pipes of 0.75 inch are welded under the corrugated sheet to store the PCM. Here, multiple PCMs are used – one with a high melting point and the other with a low melting point for the purpose of improving efficiency. A single air pass model in which air moves over the absorber plate is used for the study. Air is heated in an air heater section which also contains thermal energy storage. The energy obtained in the air heater section is first used to heat and melt the PCM. Findings Thus, heat energy is stored into the PCM and then the heated air moves into the drying chamber in which drying take place. When the sun’s insolation reduces, discharging from the PCM takes place. Thus, it reduces the fluctuation in the energy and provides continuous energy to the system. Glass wool is used as an insulation material. Different parameters for this air heater-dryer have been calculated. Originality/value The current study enhances the understanding of solar drying process and the developed model with and without multiple phase change materials can be used for optimising the drying process.

Assessment of T-History Method Variants to Obtain Enthalpy–Temperature Curves for Phase Change Materials With Significant Subcooling

2015 ◽  
Vol 7 (4) ◽  
Author(s):  
Katherine D’Avignon ◽  
Michaël Kummert
Keyword(s):  
Data Processing ◽  
Phase Change ◽  
Phase Change Materials ◽  
Alternative Interpretation ◽  
Absolute Temperature ◽  
Temperature Curve ◽  
Laboratory Equipment ◽  
Data Set ◽  
Heating And Cooling ◽  
Heat Curve

To assess the potential of thermal energy storage systems using phase change materials (PCMs), numerical simulations rely on an enthalpy–temperature curve (or equivalent specific heat curve) to model the PCM thermal storage behavior. The so-called “T-history method” can be used to obtain an enthalpy–temperature curve (H versus T) through conventional laboratory equipment and a simple experimental procedure. Different data processing variants of the T-history method have been proposed yet no systematic comparison between these versions exists in the literature nor is there a consensus as to which should be used to obtain reliable enthalpy–temperature curves. In this paper, an inorganic salt hydrate is tested in both heating and cooling. Four different data processing variants of the T-history method are used to characterize the PCM and produce enthalpy–temperature curves for this original experimental data set. Differences in the results produced by the different methods are discussed, the issues encountered are indicated, and possible approaches to overcome these problems are provided. A specific variant is recommended when using the T-history method to determine enthalpy–temperature curves. For PCMs that exhibit subcooling, an alternative interpretation using an absolute temperature interval is described so that the subcooling phase is taken into account in the enthalpy–temperature curve.

scholarly journals Numerical Study of Solidification in a Plate Heat Exchange Device with a Zigzag Configuration Containing Multiple Phase-Change-Materials

Energies ◽  
2016 ◽  
Vol 9 (6) ◽  
pp. 394 ◽  
Author(s):  
Peilun Wang ◽  
Dacheng Li ◽  
Yun Huang ◽  
Xingang Zheng ◽  
Yi Wang ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Phase Change ◽  
Phase Change Materials ◽  
Numerical Study ◽  
Plate Heat ◽  
Multiple Phase
Sign in / Sign up

Export Citation Format

Share Document