Computational studies on a latent thermal energy storage system with integral heat pipes for concentrating solar power

Nithyanandam, Karthik; Pitchumani, R.

doi:10.1016/j.apenergy.2012.09.056

Cited by 111 publications

(36 citation statements)

References 16 publications

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“…However, delayed free cooling is also possible with the increasing use of phase change materials (PCMs) to absorb the heat energy by melting the PCM material (latent heat), when the outside temperature values are not suitable for direct free cooling, and to release this heat energy when the outside ambient temperature drops to a low-enough value to secure the release of the absorbed latent heat and solidify the PCM within the heat exchanging system [12][13][14][15]. This storage capability, when coupled with a suitable heat exchanging system, can provide a free cooling solution even in desert-like climates, by utilising the wide day-night temperature difference.…”

Section: Free Coolingmentioning

confidence: 99%

Heat pipe based thermal management systems for energy-efficient data centres

Jouhara

Meskimmon²

2014

Energy

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This paper investigates the potential applications for heat-pipe based heat exchangers in enhancing the efficiency of data centres' cooling. The paper starts by assessing current industry practise and highlighting the challenges facing the data-storage industry; illustrating the legislative, technical and commercial constraints that are now, or will be prevalent in the industry as the sector continues to grow to cater for the ever increasing appetite for public sector, commercial and consumer remote data storage. The concept of free cooling and its potential application in data-centres is then introduced and analysed. A theoretical model is then constructed based on the established, proven performance characteristics of heat-pipe technologies and the weather data for a typical region in the UK. A case study has been conducted thereon and the results indicate potential energy savings of up to 75% are achievable when utilising heat pipe based free cooling systems.

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Section: Free Coolingmentioning

confidence: 99%

Heat pipe based thermal management systems for energy-efficient data centres

Jouhara

Meskimmon²

2014

Energy

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“…Transition SmA-I [33]. Series B: 4,4´´´-n-dialkyloxyquaterphenyls (n = 10, 11,12,15,14,15,16,17). Transition SmA-I.…”

Section: Liquid Crystals As Latent Heat Storage Materialsmentioning

confidence: 99%

“…To date, many solutions have been proposed for overcoming these drawbacks: micro and macro PCM encapsulation [10], use of nanoparticles [11,12], increase of the heat transfer area by means of fins or extended surfaces [13] and improvement of the solid phase thermal conductivity by using composite materials [14], metallic PCMs [15] or heat pipes [16]. However, in all these cases, the power curve when discharging the storage system still decreases with time unless the process is run under sliding pressure [17,18], with all the associated disadvantages and penalizations in the power block efficiency.…”

Section: Introductionmentioning

confidence: 99%

Liquid crystals: a new approach for latent heat storage

Bayón¹,

Rojas²

2013

Int. J. Energy Res.

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SUMMARYThe development of thermal storage systems adapted to processes in which steam is involved is currently increasing because no cost-effective solution is available to date. Entailing water condensation and evaporation, isothermal storage under latent heat is the most appropriate approach. The low thermal conductivity of the materials currently in use significantly affects both power density and power generation of the storage system in discharge. In order to solve these drawbacks, the use of liquid crystals as alternative storage materials is proposed because they can absorb/release energy at constant temperature and at the same time keep the ability to flow. In this way, liquid crystals with clearing points close to the saturated steam working temperature and high enthalpy of mesophase-isotropic liquid transition would be required. The main advantage of using liquid crystals as storage materials is that convection would be the heat transfer mechanism and power would be constant with time during discharge processes.

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“…The analytical result was validated with the experimental result, and the COP of the system was calculated to be 4.16. Nithyanandam and Pitchumani [12] performed a numerical analysis on charging and discharging of PCM in finned heat pipes for concentrated solar power applications. The authors observed an enhancement of heat transfer by adding vertical fins, the larger the number of fins, the higher the heat transfer.…”

Section: Introuctionmentioning

confidence: 99%

Investigation of Latent Heat Thermal Energy Storage System for AirConditioning Applications

Alomair¹,

Alomair²,

Tasnim³

et al. 2018

EasyChair Preprints

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In this study an experimental setup was constructed to investigate the solidification process of PCM using two different types of heat exchangers: pipe heat exchanger and horizontal finned-pipe heat exchanger. The PCM used in this study is Rubitherm (RT-18) that has a melting point of 18°C, and the heat transfer fluid (HTF) is water. To investigate the performance of pipe heat exchanger versus finned-pipe heat exchanger, two experiments were performed under identical initial, thermal and boundary conditions. The PCM is cooled down from 20°C to 5°C in both heat exchangers. Result of the temperature distribution as a function of time during the solidification process inside the TES system is presented and investigated. Visualization of the solidification process inside the TES system is also presented. Generally, the PCM is solid when its temperature is lower than the melting point, and it is liquid when its temperature is higher. PCM stores thermal energy during melting and releases heat as it solidifies. Both visualization and periodic temperature distribution results showed that as time progresses, the amount of the solid PCM increases in both heat exchangers. At a certain time, finnedpipe heat exchanger has higher amount of the solid PCM than the pipe heat exchanger. Also, the solidification time is reduced significantly when fins are added to the TES system. After 75,000 seconds of solidification, the average PCM temperature of pipe heat exchanger reached to 8.5°C. Whereas, the average PCM temperature of the finned-pipe heat exchanger reached to 8.5°C after 19,000 seconds of solidification.

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Computational studies on a latent thermal energy storage system with integral heat pipes for concentrating solar power

Cited by 111 publications

References 16 publications

Heat pipe based thermal management systems for energy-efficient data centres

Heat pipe based thermal management systems for energy-efficient data centres

Liquid crystals: a new approach for latent heat storage

Investigation of Latent Heat Thermal Energy Storage System for AirConditioning Applications

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