The sodium nitrate–urea eutectic binary mixture as a phase change material for medium temperature thermal energy storage. Part II: Accelerated thermal cycling test and water uptake behavior of the material

2016 ◽  
Vol 157 ◽  
pp. 1076-1083 ◽  
Author(s):  
G. Diarce ◽  
E. Corro-Martínez ◽  
Á. Campos-Celador ◽  
A. García-Romero ◽  
J.M. Sala
Keyword(s):  
Energy Storage ◽  
Binary Mixture ◽  
Thermal Cycling ◽  
Thermal Energy ◽  
Sodium Nitrate ◽  
Thermal Energy Storage ◽  
Thermal Cycling Test ◽  
Medium Temperature ◽  
Accelerated Thermal Cycling ◽  
Change Material

Investigation of Using Dispersed Particle and Branching Heat Exchnager in Medium Temperature Thermal Energy Storage System to Achieve Maximum Utilization of Solar Power

2013 ◽  
Author(s):  
A. M. M. G. Hasib ◽  
Rambod Rayegan ◽  
Yong X. Tao
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Power Generation ◽  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Medium Temperature ◽  
Change Material

Maximum utilization of solar energy is very critical to achieve, because a significant portion of solar energy is lost in the form of heat. In that case Thermal Energy Storage (TES) can play a significant role by capturing the energy in the form of heat and later on can be used as a backup source of energy for utilizing it in critical time. On the other side, from the view point of conservation of energy, energy cannot be created or destroyed, but surprisingly a significant amount of energy cannot be utilized due to the instantaneous nature of conventional power generation. So storing Energy is the most unique idea that can act as a strong backup for the instantaneous nature of power generation as it not only adds up to the power generation capacity but also serves to be the most reliable medium of supplying power when the energy demand is at peak. In the authors’ previous work a phase change material (molten solar salt comprised of 60% NaNO3+40%KNO3) and a system design for thermal energy storage (TES) system integrated with a solar Organic Rankine Cycle (ORC) has been proposed. The associated research problems investigated for phase change material (PCM) are the low thermal conductivity and low rate of heat transfer from heat transfer fluid to PCM. In this study a detailed numerical modeling of the proposed design using MATLAB code and the relevant calculation and results are discussed. The numerical model is based on 1-D finite difference explicit technique using the fixed grid enthalpy method. To overcome the research problem highly conductive nano-particle graphite is used to enhance the effective thermal conductivity of the PCM material in theoretical calculation. In the later part of the study results from the numerical computation have been utilized to demonstrate a comparison between a conventional heating system (with a simple single tube as a heat exchanger) and a branching heat exchanger in PCM thermal energy storage system using NTU-Effectiveness method. The comparison results show a significant amount of improvement using branching network and mixing nano-particle in terms of heat transfer, thermal conductivity enhancement, charging time minimization and pressure drop decrease. The results of this study can convince us that the proposed medium temperature TES system coupled with solar ORC can be a stepping-stone for energy efficient and sustainable future in small-scale power generation as the system proves to be better in terms of enhanced heat transfer, increased thermal conductivity and overall sustainability.

A form-stable phase change material made with a cellulose acetate nanofibrous mat from bicomponent electrospinning and incorporated capric–myristic–stearic acid ternary eutectic mixture for thermal energy storage/retrieval

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 84245-84251 ◽  
Author(s):  
Yibing Cai ◽  
Mengmeng Liu ◽  
Xiaofei Song ◽  
Jin Zhang ◽  
Qufu Wei ◽  
...  
Keyword(s):  
Energy Storage ◽  
Binary Mixture ◽  
Stearic Acid ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Ternary Eutectic ◽  
Eutectic Mixture ◽  
Selective Dissolution ◽  
Stable Phase ◽  
Change Material

An innovative type of form-stable PCM was prepared by incorporating CMS ternary eutectic mixture with CA nanofibers that was derived from electrospinning of binary mixture of CA/PVP and subsequent selective dissolution of PVP from bicomponent mat.

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