Theoretical Analysis of Overall Heat Loss Coefficient in a Flat Plate Solar Collector with an In-Built Energy Storage Using a Phase Change Material

2012 ◽  
pp. 145-154
Author(s):  
R. Sivakumar ◽  
V. Sivaramakrishnan
Keyword(s):  
Energy Storage ◽  
Theoretical Analysis ◽  
Phase Change ◽  
Flat Plate ◽  
Heat Loss ◽  
Phase Change Material ◽  
Solar Collector ◽  
Flat Plate Solar Collector ◽  
Overall Heat Loss Coefficient ◽  
Change Material

Performance of a coupled transpired solar collector—phase change material-based thermal energy storage system

2018 ◽  
Vol 161 ◽  
pp. 72-79 ◽  
Author(s):  
Mark R. Poole ◽  
Sanjay B. Shah ◽  
Michael D. Boyette ◽  
Larry F. Stikeleather ◽  
Tommy Cleveland
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Storage System ◽  
Energy Storage System ◽  
Thermal Energy Storage System ◽  
Change Material

Numerical Investigation of a Phase Change Material Building Integrating Solar Thermal Collector PCM-BST

2021 ◽  
pp. 1-34
Author(s):  
Benkadour Ayman ◽  
Mustapha Faraji
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Numerical Investigation ◽  
Melting Temperature ◽  
Phase Change Material ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Concrete Wall ◽  
Change Material

Abstract Sensible thermal energy storage systems can reduce energy environmental fluctuation dependency with the nocturnal energy needs usage in maintaining the building's comfort levels. In the present paper, Phase Change Material (PCM) is introduced to improve the thermal energy storage capacity of a solar collector integrating a novel composite Phase Change Material (PCM)/concrete wall. A mathematical model based upon the conservation and heat transfer equations has been developed using the enthalpy method. The Numerical investigation has been implemented into a personal FORTRAN code. Many series of simulation runs were executed. The position of the PCM layer within the wall and the PCM melting temperature are varied in the range 0 cm ≤ xm ≤ 7.5 cm and 15 °C ≤ Tm ≤ 35 °C, respectively. The objective is to let inner temperature Tin swing close to a comfort threshold. The position of PCM close to the absorber improves the efficiency of the room heating with good nocturnal use of latent heat stored during the day. PCM melting temperature affects deeply the composite PCM/concrete wall/solar collector behavior. Lastly, PCM gained the system an important benefit which is the solar collector high-Temperature isolation as to not reach the room and disturb the inside comfort zone by melting and solidifying. Those parameters can be considered as the primary pointers for PCM/wall integrated solar collector design. Also, a Daily Heating Potential, Qh, and Thermal Load Leveling, TLL, are introduced to evaluate the system performance.

Reduced Model for a Thermal Analysis of a Flat Plate Solar Collector With Thermal Energy Storage Using Phase Change Material (PCM)

2015 ◽  
Author(s):  
Mauricio Carmona ◽  
Gabriel Caicedo ◽  
Humberto Gómez Vega ◽  
Antonio Bula
Keyword(s):  
Thermal Analysis ◽  
Energy Storage ◽  
Phase Change ◽  
Flat Plate ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Solar Collector ◽  
Sensible Heat ◽  
Simplified Models ◽  
Flat Plate Solar Collector

In conventional solar water heaters, the thermal energy storage is accomplished by increasing the sensible heat in a fluid. Therefore, the accumulation capacity of sensible heat is proportional to the mass storage and the increase of temperature, so that an increase in the requirements involves a bigger tank volume. Phase change materials (PCM) stored energy at constant temperature (or at least in a fairly narrow range of temperature) while the phase change is produced, they are presented as an alternative to compensate the solar heat supply periods and the thermal demand with a better heat accumulation per volume unit. In contrast, these systems require more complicated thermal analysis and designs than the traditional systems by sensible heat with a single phase. The selection of PCM, its content and location on the device will have a determining effect on the overall performance of the solar collector. This implies that the heat exchanger must be designed for each specific application. Currently, there are no commercial devices for heating water by solar energy using thermal accumulation with PCM. However, preliminary studies in lab scale have shown significant increases in efficiencies and supply capacity. Several authors have been performed experimental and numerical studies in solar collectors including PCM technology, but, due to the complexity of the phenomena and the high consumptions of resources for both approaches, it has not been possible to evaluate different configurations that lead to optimized designs for selection, location and amount of PCM. This fact shows the need to develop simplified models that consider the main physical phenomena in the operation, in order to support the experimental and numerical techniques to determine the comprehensive thermal behavior. This kind of models can be used to estimate the performance for different configurations and boundary conditions in a fast way, to make possible in a posterior stage a detailed evaluation with numerical analysis or an experimental technique. In this paper, a simplified comprehensive model for assessing thermal performance of a flat-plate solar collector with PCM is presented with incorporation of specialized semi-empirical correlations. The model takes into account the main thermodynamic and heat transfer processes in the device, including the internal and external convection effects, conduction, solar radiation analysis, radiation, losses and interactions between surfaces, material solid-liquid phase change and conjugated problems in gas-liquid-solid zones. Due to the numerous existing design alternatives, consideration of an excessive number of options in the final design can lead to long development times and process inefficiencies. Therefore, a methodology of design that includes fast calculations of the main thermal parameters is highly regarded, since this can reduce the number of study cases and thus obtain optimal configurations from the simplified models. The performance of the reduced model, including a sensibility analysis of several input data, is compared qualitatively with results obtained in a traditional collector for a typical cycle available in bibliography. Integrated simplified models are developed to perform a coarse preliminary design of flat solar collectors with incorporation of PCM technology, and thus serve as a pre-evaluator of the different configurations.

NUMERICAL STUDY OF A SOLAR GREENHOUSE DRYER WITH A PHASE-CHANGE MATERIAL AS AN ENERGY STORAGE MEDIUM

2018 ◽  
Vol 49 (6) ◽  
pp. 509-528 ◽  
Author(s):  
Orawan Aumporn ◽  
Belkacem Zeghmati ◽  
Xavier Chesneau ◽  
Serm Janjai
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Numerical Study ◽  
Storage Medium ◽  
Solar Greenhouse ◽  
Change Material
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