High temperature latent heat thermal energy storage using heat pipes

Shabgard, Hamidreza; Bergman, T. L.; Sharifi, Nourouddin; Faghri, Amir

doi:10.1016/j.ijheatmasstransfer.2010.03.035

Cited by 211 publications

(66 citation statements)

References 36 publications

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“…An increase of 70% for the melting rate of a PCM with embedded heat pipes was reported by Robak et al [34]. Shabgard et al [35] investigated the impact of heat pipes on two configurations of PCM-based TES; one where the PCM surrounds tubes through which the heat transfer fluid (HTF) flows, and the second where the HTF cross-flows over tubes of encapsulated PCM. Their work showed that heat pipes have a more significant impact when the PCM is in the tubes rather than surrounding them.…”

Section: Introductionmentioning

confidence: 92%

Development of an Integrated Thermal Energy Storage and Free-Piston Stirling Generator for a Concentrating Solar Power System

2017

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Incorporating thermal energy storage (TES) into a concentrating solar power (CSP) system extends the power production hours, eliminating intermittency and reducing the Levelized Cost of the Energy (LCOE). The designed TES system was integrated with a 3 kW free-piston Stirling convertor. A NaF-NaCl eutectic salt was chosen as the phase change material (PCM) with a melting temperature of 680 • C. This eutectic salt has an energy density that is 5 to 10 times that of a typical molten salt PCM. In order to overcome the drawbacks of the material having a low thermal conductivity, heat pipes were embedded into the PCM to enhance the heat transfer rate within the system. Since the dish collector tracks the sun over the course of the day, two operational extremes were tested on the system; horizontal (zero solar elevation at sunrise/sunset) and vertical (solar noon). Although the system's performance was below the expectations due to improperly sized wicks in the secondary heat pipes, the results indicated that the Stirling engine was able to produce 1.3 kWh of electricity by extracting latent heat energy from the PCM; thus, the concept of the design was validated.

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Section: Introductionmentioning

confidence: 92%

Development of an Integrated Thermal Energy Storage and Free-Piston Stirling Generator for a Concentrating Solar Power System

2017

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“…Heat pipes have been applied in LHS systems for low temperature (<100 o C) applications [56 -59]. By employing a thermal network model, Shabgard et al [60] showed that heat pipe has the potential of enhancing the heat transfer rates in large-scale LHS system for parabolic-trough plants using synthetic oil as HTF. Economic analysis conducted by Robak, et al [61] showed that 15% potential decrease in capital cost is obtainable compared to the commercially available two-tank system.…”

Section: Sandwich Conceptmentioning

confidence: 99%

“…The PCM is situated at the middle with embedded vertical channels linking the bottom with the top. Figure 5 The novel reflux heat transfer storage (RHTS) system concept [60] During charging, steam is passed through the bottom heat exchanger which is situated in a pool of the secondary HTF, thus boiling the secondary-HTF leading to its evaporation through the channels in the thermal storage compartment. As the secondary-HTF pass through the compartment, the solid PCM is heated and it melts leading to the condensation of the secondary HTF back into the pool.…”

Section: Sandwich Conceptmentioning

confidence: 99%

Review of PCMS and heat transfer enhancement methods applied in parabolic trough solar plants thermal storage systems

Muhammad¹

2018

Nig. J. Tech.

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Solar thermal power generation requires a cost effective thermal storage system. The existing two tank system is very expensive due to the storage material inventory. The use of phase change materials (PCMs) offers higher storage density. A review of potential PCMs was conducted in order to come up with commercially available ones having suitable properties. Most available PCMs have low thermal conductivity making heat transfer enhancement necessary for power applications. The various methods of heat transfer enhancement in latent heat storage systems were also reviewed systematically. The review showed that three commercially-available PCMs are suitable in the operating temperature range of parabolic trough plants. Many heat transfer enhancement methods have been investigated in the literature but the use of aluminium fins is the most promising in the temperature range of 250-330 o C. Many eutectic mixtures of materials have potential for use but discrepancies exist in their reported melting temperature and latent heat of fusion.Keywords: Latent heat, high temperature, thermal conductivity enhancement 1. INTRODUCTION Solar thermal power generation is one the most sustainable and renewable source of electricity. It has the potential of fulfilling the world's electricity needs due to the availability of solar energy in sufficient quantity in various regions of the world [1 -3]. Various solar thermal technologies have been developed over the years for the generation of electricity [4]. The parabolic dish [5 -7] power tower [8,9] and the parabolic trough [10 -12] are the most advanced and have been commercialized. The parabolic trough technology using synthetic oil as the heat transfer fluid (HTF) with operating temperature range between 290 and 400 o C is the most matured and cost effective technology for capacities <200 MW. This can partly be attributed to the experience gained in the operation and maintenance of the 354 MW Solar Electric Generating Station (SEGS) plants for over two (2) decades [4,13]. Most commercial solar plants in operation and under construction are of the parabolic trough technology [9]. The stable and sustainable operation of a solar thermal plant requires a back-up thermal energy source in order to produce thermal energy when that from the sun is insufficient. For cost effective operation there is also the need to avoid energy wastage when the

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“…Paraffin LHTES, with copper-water heat pipes embedded within a rectangular PCM enclosure was developed and tested by Liu et al [12]. Recently, Shabgard et al modelled a large scale heat pipe-assisted LHTES and reported predictions showing improvement in both melting and solidification rates [13]. Although some research has been conducted regarding heat pipe-assisted LHTES, the effectiveness of the approach has apparently not been quantified experimentally.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of a Solar Air Dryer with Thermal Energy Storage Unit (PCM)

Bhagwat¹,

Patil²,

Bhosale³

et al. 2017

International Advanced Research Journal in Science, Engineering

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Among the various renewable energy resources solar energy potential is the highest in the country. The global solar radiation over India varies from 4-7 kWh/sq. m/day. The solar energy is also used for heating the air that air is applied to dry the clothes, food dehydration, natural rubber, etc. Circulation of atmospheric temperature air from solar flat plate collector and then that high temperature air is supplied to room. In India, we have 12 sunshine hours and 12 non-sunshine hours so solar air heater is limited to run only in sunshine hours. To run it night time it required external energy supply, so cost of the solar air heater is increase. Our requirement is to supply the hot air to the room up to 60 ºC to 65 º C temperatures during day and night time. To achieve such high temperature we need to modified the conventional solar air-dryer in such way that it will gives us hot air temperature in the range of 60 ºC to 65 ºC. For the use of Solar Air Dryer during night time, some form of energy storage is required during sunshine hours and that stored energy can be used during non-sunshine hours. Present work is focused towards incorporation of heat pipes with LHTES is of interest. Heat pipes increase heat transfer rates to or from the Phase change material (PCM), while maintaining small temperature differences between the PCM and heat transfer fluid (HTF) in heat pipe. This experimental setup, solar air-dryer assisted with TES unit including PCM and heat pipe. This study focuses on to the performance enhancement of flat plate collector solar air-dryer.

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High temperature latent heat thermal energy storage using heat pipes

Cited by 211 publications

References 36 publications

Development of an Integrated Thermal Energy Storage and Free-Piston Stirling Generator for a Concentrating Solar Power System

Development of an Integrated Thermal Energy Storage and Free-Piston Stirling Generator for a Concentrating Solar Power System

Review of PCMS and heat transfer enhancement methods applied in parabolic trough solar plants thermal storage systems

Experimental Analysis of a Solar Air Dryer with Thermal Energy Storage Unit (PCM)

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