Investigation of The Effect of Using Different Type of Fin on The Melting Time of PCM in A Latent Thermal Energy Storage Unit Using CaCl2 .6H2O and Na2SO4.10H2O Phase Change Materials by CFD Analysis

Fadime Şimşek; Sefa Organ

Article Details

Investigation of The Effect of Using Different Type of Fin on The Melting Time of PCM in A Latent Thermal Energy Storage Unit Using CaCl2 .6H2O and Na2SO4.10H2O Phase Change Materials by CFD Analysis

Authors:

Fadime Şimşek | Sefa Organ

Publisher:

Giresun University

Main Topics:

Makine Mühendisliği

Journal:

Karadeniz Fen Bilimleri Dergisi Vol.13 Issue 2, pp.701-723

Document Type:

Article

Publication Date:

6/2023

Document Language:

Turkish

Document ID (Org No.):

2001291017

pISSN:

2564-7377

Keywords:

Abstract:

 In this study, a double tube concentric heat exchanger was designed to store thermal energy by utilizing the latent heat storage properties of CaCl2.6H2O calcium chloride hexahydrate and Na2SO4.10H2O sodium chloride decahydrate inorganic phase change materials PCM. Computational Fluid Dynamics CFD analyzes were performed with the help of ANSYS Fluent commercial program for 50 0C, 60 0C and 70 0C ITA heat transfer fluid water temperatures selected in accordance with the operational waste heat values. With the two-dimensional and time-dependent analyzes, the PCM melting time analyzes were completed first in the finless state and then in the case of placing a different type of fin in the PCM in order to increase the heat transfer. Different from the literature, the fin effectiveness of 6,9,12,15 finned models, which were determined by ANSYS analysis as 2.2, 3.3, 4.4, 5.5, respectively, were at 60 C, which was determined as the optimum waste heat temperature compared to the finless model. It was observed that CaCl2.6H2O melted in 140 minutes and Na2SO4.10H2O in 180 minutes in the finless state. The reason for this situation is that the thermal conductivity coefficient of CaCl2.6H2O is higher. With the increase in the number of fins compared to the finless condition, the melting times decreased by 71.42, 75.71, 79.28 and 82.14 for CaCl2.6H2O phase change material, and 73.33, 77.77, 80 and 81.66 for Na2 SO4.10H2O. According to the results of the analysis, it was determined that the melting time of PCM decreased with the increase in ITA temperature and the number of fins, and heat energy was transferred from heat transfer fluid to phase change material more quickly.

 In this study, a double tube concentric heat exchanger was designed to store thermal energy by utilizing the latent heat storage properties of CaCl2.6H2O calcium chloride hexahydrate and Na2SO4.10H2O sodium chloride decahydrate inorganic phase change materials PCM. Computational Fluid Dynamics CFD analyzes were performed with the help of ANSYS Fluent commercial program for 50 0C, 60 0C and 70 0C ITA heat transfer fluid water temperatures selected in accordance with the operational waste heat values. With the two-dimensional and time-dependent analyzes, the PCM melting time analyzes were completed first in the finless state and then in the case of placing a different type of fin in the PCM in order to increase the heat transfer. Different from the literature, the fin effectiveness of 6,9,12,15 finned models, which were determined by ANSYS analysis as 2.2, 3.3, 4.4, 5.5, respectively, were at 60 C, which was determined as the optimum waste heat temperature compared to the finless model. It was observed that CaCl2.6H2O melted in 140 minutes and Na2SO4.10H2O in 180 minutes in the finless state. The reason for this situation is that the thermal conductivity coefficient of CaCl2.6H2O is higher. With the increase in the number of fins compared to the finless condition, the melting times decreased by 71.42, 75.71, 79.28 and 82.14 for CaCl2.6H2O phase change material, and 73.33, 77.77, 80 and 81.66 for Na2 SO4.10H2O. According to the results of the analysis, it was determined that the melting time of PCM decreased with the increase in ITA temperature and the number of fins, and heat energy was transferred from heat transfer fluid to phase change material more quickly.

 In this study, a double tube concentric heat exchanger was designed to store thermal energy by utilizing the latent heat storage properties of CaCl2.6H2O calcium chloride hexahydrate and Na2SO4.10H2O sodium chloride decahydrate inorganic phase change materials PCM. Computational Fluid Dynamics CFD analyzes were performed with the help of ANSYS Fluent commercial program for 50 0C, 60 0C and 70 0C ITA heat transfer fluid water temperatures selected in accordance with the operational waste heat values. With the two-dimensional and time-dependent analyzes, the PCM melting time analyzes were completed first in the finless state and then in the case of placing a different type of fin in the PCM in order to increase the heat transfer. Different from the literature, the fin effectiveness of 6,9,12,15 finned models, which were determined by ANSYS analysis as 2.2, 3.3, 4.4, 5.5, respectively, were at 60 C, which was determined as the optimum waste heat temperature compared to the finless model. It was observed that CaCl2.6H2O melted in 140 minutes and Na2SO4.10H2O in 180 minutes in the finless state. The reason for this situation is that the thermal conductivity coefficient of CaCl2.6H2O is higher. With the increase in the number of fins compared to the finless condition, the melting times decreased by 71.42, 75.71, 79.28 and 82.14 for CaCl2.6H2O phase change material, and 73.33, 77.77, 80 and 81.66 for Na2 SO4.10H2O. According to the results of the analysis, it was determined that the melting time of PCM decreased with the increase in ITA temperature and the number of fins, and heat energy was transferred from heat transfer fluid to phase change material more quickly.

 Bu çalışmada, CaCl2.6H2O Kalsiyum klorür hekzahidrat ve Na2SO4.10H2O Sodyum klorür dekahidrat inorganik faz değişim malzemelerinin FDM gizli ısı depolama özelliklerinden faydalanılarak termal enerji depolamak için çift borulu eşmerkezli bir ısı değiştiricisi tasarlanmıştır. Hesaplamalı Akışkanlar Dinamiği HAD analizleri, işletme atık ısı değerlerine uygun olarak seçilen 50 0C, 60 0C ve 70 0C ITA ısı transfer akışkanı su sıcaklıkları için ANSYS Fluent ticari programı yardımıyla yapılmıştır. İki boyutlu ve zamana bağlı olarak gerçekleştirilen analizlerle öncelikle kanatçıksız durumdaki, daha sonra ısı transferini arttırmak amacıyla FDM içerisine literatürden farklı bir tip kanat yerleştirilmesi durumundaki FDM erime süresi analizleri tamamlanmıştır. Kanat etkenlikleri sırasıyla 2,2, 3,3, 4,4, 5,5 olarak literatürden farklı bir şekilde ANSYS analiziyle tespit edilen 6,9,12,15 kanatlı modellerin, kanatsız modele göre optimum atık ısı sıcaklığı olarak belirlenen 60 C sıcaklıkta erime prosesleri incelenmiştir. Kanatçıksız durumda CaCl2.6H2Oın 140 dakikada, Na2SO4.10H2O ün ise 180 dakikada erime gösterdiği görülmüştür. Bu durumun nedeni CaCl2.6H2Onin ısıl iletim katsayısının daha yüksek olmasıdır. Kanatsız duruma göre kanat sayısının artmasıyla erime sürelerinin, CaCl2.6H2O faz değişim malzemesi için 71,42, 75,71, 79,28 ve 82,14, Na2SO4.10H2 O için ise 73,33, 77,77, 80 ve 81,66 oranında azaldığı belirlenmiştir. Analiz sonuçlarına göre, ITA sıcaklığı ve kanat sayısındaki artışla FDM nin erime süresinin azaldığı ve ısı transfer akışkanından faz değişim malzemesine daha hızlı bir şekilde ısı enerjisi aktarıldığı tespit edilmiştir.

Article Details

Investigation of The Effect of Using Different Type of Fin on The Melting Time of PCM in A Latent Thermal Energy Storage Unit Using CaCl2 .6H2O and Na2SO4.10H2O Phase Change Materials by CFD Analysis

Authors:

Fadime Şimşek | Sefa Organ

Publisher:

Giresun University

Main Topics:

Makine Mühendisliği

Journal:

Karadeniz Fen Bilimleri Dergisi Vol.13 Issue 2, pp.701-723

Document Type:

Article

Publication Date:

6/2023

Document Language:

Turkish

Document ID (Org No.):

2001291017

pISSN:

2564-7377

Thermal energy storage

PCM

fin

melting timeTermal enerji depolama

FDM

kanat

erime süresi.

Issues

Article Details

Authors: Fadime Şimşek | Sefa Organ

Publisher: Giresun University

Main Topics: Makine Mühendisliği

Journal: Karadeniz Fen Bilimleri Dergisi Vol.13 Issue 2, pp.701-723

Document Type: Article

Publication Date: 6/2023

Document Language: Turkish

Document ID (Org No.): 2001291017

pISSN: 2564-7377

Issues

Authors:

Fadime Şimşek | Sefa Organ

Publisher:

Giresun University

Main Topics:

Makine Mühendisliği

Journal:

Karadeniz Fen Bilimleri Dergisi Vol.13 Issue 2, pp.701-723

Document Type:

Article

Publication Date:

6/2023

Document Language:

Turkish

Document ID (Org No.):

2001291017

pISSN:

2564-7377