Performance analysis of a cascade PCM heat exchanger and two-phase closed thermosiphon: A case study of geothermal district heating system

Borji, Mehdi; Ziapour, Behrooz M.; Kazemi, Admin

doi:10.1016/j.seta.2020.100755

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…Efforts to enhance the thermal performance of latent storage systems have led researchers to focus on utilizing multiple PCMs [23][24][25]. Hassanpour et al [24] proposed the integration of a cascade TES with geothermal resources for a DH system. The TES system is designed to supply the building's energy consumption.…”

Section: System Descriptionmentioning

confidence: 99%

Numerical Investigation of Thermal Energy Storage Systems for Collective Heating of Buildings

Ali,

Ajbar,

Lamrani

2024

Buildings

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This study aims to investigate and identify the most effective thermal energy storage (TES) system configuration for the collective heating of buildings. It compares three TES technologies, i.e., sensible, latent, and cascade latent shell and tube storage, and examines their respective performances. A fast and accurate lumped thermal dynamic model to efficiently simulate TES system performances under different operation conditions is developed. The validation of this model’s accuracy is achieved by aligning numerical findings with data from prior experimental studies. Key findings indicated that the latent and cascade latent shell and tube storage systems demonstrate superior thermal energy storage capacities compared to the sensible configuration. Using a single-phase change material (PCM) tank increases the duration of constant thermal power storage by about 50%, and using a cascade PCM tank further enhances this duration by approximately 65% compared to the sensible TES case. Moreover, the study revealed that adjusting the PCM composition within the cascade TES significantly influenced both thermal power storage durations and pumping energy consumption. In summary, the recommended cascade PCM configuration for collective heating of buildings offers a balanced solution, ensuring prolonged stable thermal power production, elevated HTF outlet temperatures, and improved energy efficiency, presenting promising prospects for enhancing TES systems in district heating applications.

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Section: System Descriptionmentioning

confidence: 99%

Numerical Investigation of Thermal Energy Storage Systems for Collective Heating of Buildings

Ali,

Ajbar,

Lamrani

2024

Buildings

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“…As a result of their efficiency and low impact on the environment, air-ground/air-water heat exchanger systems have gained traction as a viable option for dealing with this issue. Many researchers over the word developed and investigated the performances of ground buried, and air-water heat exchanger [4][5][6][7][8]. We cite as an example the work of Urcheguia et al…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of New Geothermal System for Heating Premises and Thermal Complexes: Experimental Investigation of Water-Air Heat Exchanger in the East of Algeria

Chettir,

Labed,

Moummi

et al. 2024

Annals of West University of Timisoara - Physics

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This paper constitutes a new technological solution for the exploitation of one of the most important geothermal deposits located in the locality of Biskra (South-east Algeria). This is the Albian aquifer whose hot waters from boreholes, hot springs and spas are poorly exploited while ambient temperatures during winter periods reach very low levels, especially at night. The principle of this geothermal system is to immerse a PVC tubular water-air exchanger in a pool permanently supplied with hot water from a low-energy geothermal borehole with a high flow rate. The choice of PVC material is attributed to the fact that hot geothermal waters are generally of an aggressive composition to steels and metals in general. The geothermal air heater allows the heating of the ambient cold air which is introduced into the exchanger and then extracted hot using an extraction fan. The hot air is then diffused into premises for heating during the winter season. The improvement in the performance of this type of exchanger is highlighted, in particular by acting on the number of pipes of the exchanger and the air flow rate using geothermal energy (low energy) as a source of renewable and clean energy. The experimental results obtained showed that the energy gain is a function of the length of the exchanger and the air flow rate. This gain can be up to 20°C between the inlet and outlet of the miniature exchanger model, which means that the proposed solution could be technically feasible.

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“…Due to this reason, the phase change material (PCM) is used, which can store the trapped energy efficiently 13,14 . The fact that PCM has a large number of applications in energy storage, could be used not only for transportation means such as automobiles, 15,16 electric vehicles, 17,18 even ships, 19,20 but also in renewable energy systems such as solar, 21 geothermal 22,23 …”

Section: Introductionmentioning

confidence: 99%

“…13,14 The fact that PCM has a large number of applications in energy storage, could be used not only for transportation means such as automobiles, 15,16 electric vehicles, 17,18 even ships, 19,20 but also in renewable energy systems such as solar, 21 geothermal. 22,23 In the PCM operation process, PCM heat storage/ release rate is affected by thermal conductivity, and PCM thermal conductivity encapsulated inside a container is increased using metal mesh, 24 nanoparticles, 25 fins 26,27 and modifying the heat transfer tube (HTT). 28,29 In addition, container geometry (such as rectangular, spherical, and cylindrical containers) also affects PCM melting.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on melting and energy storage density enhancement of phase change material in a horizontal cylindrical container

Senthil

Punniakodi

Balasubramanian

et al. 2022

Intl J of Energy Research

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Summary Thermal energy storage (TES) plays a significant role in storing heat energy during the availability of a source. The phase change material (PCM) storage density is high, but its meager thermal conductivity leads to ineffective heat transfer. This mathematical modeling work simulates two different heat transfer tube (HTT) arrangements in a horizontal cylindrical container to melt the PCM using the enthalpy‐porosity method. Case‐1 with a single HTT at the centroidal axis and Case‐2 with multiple tubes spread radially. Cases‐1 and 2 are observed with melting and solidification duration of 39.8 and 184 minutes, and 69.83 and 292.5 minutes respectively. Case‐1 has a shorter melting and solidification time because of the optimal HTT location. Case‐2 is observed with a high heat storage density of 224.95 MJ/m3, compared to Case‐1 with 224.571 MJ/m3. Nusselt number is higher for Case‐2 (385.86) during charging and higher for Case‐1 (208) during discharging. Nusselt number initially varies for both cases due to effective heat convection at the start; however, Case‐1 has a shorter melting duration with its energy density lower than the Case‐2. Based on the obtained results, it could be suggested that Case‐1 could be applicable when simultaneous heat transfer requires less energy storage and a faster melting rate, while Case‐2 could be used in places that demand a higher storage density.

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Performance analysis of a cascade PCM heat exchanger and two-phase closed thermosiphon: A case study of geothermal district heating system

Cited by 10 publications

References 27 publications

Numerical Investigation of Thermal Energy Storage Systems for Collective Heating of Buildings

Numerical Investigation of Thermal Energy Storage Systems for Collective Heating of Buildings

Feasibility Study of New Geothermal System for Heating Premises and Thermal Complexes: Experimental Investigation of Water-Air Heat Exchanger in the East of Algeria

Numerical investigation on melting and energy storage density enhancement of phase change material in a horizontal cylindrical container

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