Analysis of Solar Energy Storage in Buildings Using Phase Change Materials (PCM)

Gholaminia, Vahid (2017) Analysis of Solar Energy Storage in Buildings Using Phase Change Materials (PCM). Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Nowadays, the use of renewable energy sources such as solar energy has expanded to prevent environmental degradation as a result of increased fossil fuel consumption. Solar energy storage is essential, because of non-uniform sunlight throughout the day and the need for stable energy throughout the day. One of the most effective and innovative ways in thermal energy storage is the use of phase-change materials. Accurate analysis of the phase-change materials behavior in the process of solar energy storage will results in the optimal use of these materials. In this thesis, modeling of solar energy storage using phase-change materials has been analyzed. First, the necessity of using phase-change materials in the process of solar energy storage has been investigated. After introducing energy storage process modeling techniques in tanks with phase-change material, methods for increasing the heat transfer velocity in these tanks have been investigated. In the following, the proposed model for exact modeling of the energy storage process in a tank containing phase-change materials is described and, the process of using the heat capacity method for solving phase change equations is considered, taking into account the boundary conditions governing the tank. Then, using the proposed model, the thermal energy storage process was simulated in a tank containing phase-change materials. After confirming the validation of the proposed method, using the results of valid laboratory research, the effect of phase-change materials type, the fluid inlet temperature, the tank diameter and of fins number on the temperature and the amount of thermal energy storage were analyzed. The results of the study of phase-change material type influence have shown that the use of materials with more phase- change enthalpy is more efficient in the process of thermal energy storage and leads to storage more thermal energy in the lower temperature ranges. Also, the results of the study the influence of the heat transfer fluid inlet temperature showed that, as the fluid inlet temperature increased, the temperature difference between the heat transfer fluid and the phase-change material and therefore, the amount and speed of energy storage will increases. It was also shown that, with increasing of tank diameter and increasing the mass of phase-change materials, the phase-change material temperature will increases with a smaller slope. Therefore, because of the compensation of the effect of increasing material mass by lower temperature rise, the amount of energy stored in the heat does not correspond to the increase in the amount of phase-change material. In the end, after analyzing the effects of the fins number on the solar energy storage process, it was shown that, with increasing the number of fins, the average temperature and the stored energy amount in the phase-change materials will be increased.

Item Type: Thesis (Masters)
Persian Title: بررسی ذخیره¬سازی انرژی خورشیدی در ساختمان ها با استفاده از مواد تغییرفاز دهنده
Persian Abstract: Nowadays, the use of renewable energy sources such as solar energy has expanded to prevent environmental degradation as a result of increased fossil fuel consumption. Solar energy storage is essential, because of non-uniform sunlight throughout the day and the need for stable energy throughout the day. One of the most effective and innovative ways in thermal energy storage is the use of phase-change materials. Accurate analysis of the phase-change materials behavior in the process of solar energy storage will results in the optimal use of these materials. In this thesis, modeling of solar energy storage using phase-change materials has been analyzed. First, the necessity of using phase-change materials in the process of solar energy storage has been investigated. After introducing energy storage process modeling techniques in tanks with phase-change material, methods for increasing the heat transfer velocity in these tanks have been investigated. In the following, the proposed model for exact modeling of the energy storage process in a tank containing phase-change materials is described and, the process of using the heat capacity method for solving phase change equations is considered, taking into account the boundary conditions governing the tank. Then, using the proposed model, the thermal energy storage process was simulated in a tank containing phase-change materials. After confirming the validation of the proposed method, using the results of valid laboratory research, the effect of phase-change materials type, the fluid inlet temperature, the tank diameter and of fins number on the temperature and the amount of thermal energy storage were analyzed. The results of the study of phase-change material type influence have shown that the use of materials with more phase- change enthalpy is more efficient in the process of thermal energy storage and leads to storage more thermal energy in the lower temperature ranges. Also, the results of the study the influence of the heat transfer fluid inlet temperature showed that, as the fluid inlet temperature increased, the temperature difference between the heat transfer fluid and the phase-change material and therefore, the amount and speed of energy storage will increases. It was also shown that, with increasing of tank diameter and increasing the mass of phase-change materials, the phase-change material temperature will increases with a smaller slope. Therefore, because of the compensation of the effect of increasing material mass by lower temperature rise, the amount of energy stored in the heat does not correspond to the increase in the amount of phase-change material. In the end, after analyzing the effects of the fins number on the solar energy storage process, it was shown that, with increasing the number of fins, the average temperature and the stored energy amount in the phase-change materials will be increased.
Supervisor:
SupervisorE-mail
Rahimi, MostafaUNSPECIFIED
Advisor:
AdvisorE-mail
Ghaebi, HadiUNSPECIFIED
Subjects: Faculty of Engineering > Department of Mechanical Engineering
Divisions > Faculty of Engineering > Department of Mechanical Engineering
Divisions: Subjects > Faculty of Engineering > Department of Mechanical Engineering
Faculty of Engineering > Department of Mechanical Engineering
Date Deposited: 29 Sep 2018 18:43
Last Modified: 29 Sep 2018 18:43
URI: http://repository.uma.ac.ir/id/eprint/125

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