Global advancement on experimental and thermal analysis of evacuated tube collector with and without heat pipe systems and possible applications

Chopra, K.; Tyagi, V.V.; Pandey, A.K.; Sarı, Ahmet

doi:10.1016/j.apenergy.2018.06.067

Cited by 142 publications

(29 citation statements)

References 129 publications

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“…In residential sectors, this requirement has gone up to approximately 85% of the total requirement of hot water and this is continuously increasing. At present, the requirement of hot water in hospitals and hotels is approximately 29% and expected to reach up to 53% by 2022 . Currently, most of this requirement of hot water is fulfilled by electric heaters or fossil fuels.…”

Section: Potential Applications Of Tested Pcmsmentioning

confidence: 99%

“…At present, the requirement of hot water in hospitals and hotels is approximately 29% and expected to reach up to 53% by 2022. 32 Currently, most of this requirement of hot water is fulfilled by electric heaters or fossil fuels. Due to unavailability of commercial PCMs in the desired temperature range, most of the commercially available drying and water heating systems do not have provision for heat storage unit.…”

Section: Potential Applications Of Tested Pcmsmentioning

confidence: 99%

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A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

et al. 2019

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Summary In this experimental study, thermal aging test for investigating the variations in thermal and chemical properties of two selected organic phase change materials (PCMs) has been carried out. Polyethylene glycols (PEGs) of molecular weight of 2000 and 10 000 have been considered as potential latent heat thermal energy storage (LHTES) materials for investigation. The aim of this study is to identify the probable variations in thermal properties and chemical structures of PEGs after melting/freezing cycles repeated for 1500 times. The differential scanning calorimetry (DSC) technique was adopted for measuring the thermal properties such as melting point and latent heat of PCMs. In order to study the variations in PCM's chemical functional groups, Fourier transform infrared (FT‐IR) spectroscopy was used. Thermal durability property after the cycling test was investigated using thermogravimetric analysis. The DSC measurements indicated that PEG2000 experienced a maximum variation of about 4°C in melting point while the latent heat of fusion reduces by 16% after the cycle test. PEG10000 shows a variation of about 0.3°C in melting point and 15% of the latent heat of melting after the entire cycle test. The spectral investigation confirms that there are no variations in the functional groups of selected materials after cycle test, which can be inferred as chemical stability of them. The thermal gravimetric analysis curves show that both PEGs are thermally quite durable as well after such large number of melt/freeze cycles. Thermal cycling results and economic analysis confirm that both PEGs are potential PCMs for passive solar thermal management purposes. Highlights Synthesis of polyethylene glycol‐based binary eutectic mixtures. Accelerated thermal cycle test of eutectic mixtures. Binary mixtures were found chemically stable. Charging/discharging rates of PEG are controlled. Novelty Statement This paper presents the thermal performance of two polyethylene glycols, viz., PEG2000 and PEG10000. These materials were melted and solidified 1500 times for testing their suitability as thermal energy storage materials, and it was found that these materials are stable enough to store solar energy for five years. They found to be suitable for many solar energy storage applications.

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Section: Potential Applications Of Tested Pcmsmentioning

confidence: 99%

Section: Potential Applications Of Tested Pcmsmentioning

confidence: 99%

A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

et al. 2019

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“…As mentioned earlier, HPSCs have been utilized in various range of thermal applications and several review papers have summarized these studies comprehensively [21,34]. Taking into account that the main focus of this review paper is to study the latest strategies, methods, and designs to enhance the performance of HPS systems and in order to avoid repetition of the previous published papers, only the most recent and remarkable studies regarding the applications and modelling of HPSCs are presented in Tables 1 and 2, respectively.…”

Section: Heat Pipe Solar Collectors: Structure Principles Of Operatimentioning

confidence: 99%

“…Among all the applications, a great share of the studies has been allocated to generating electricity using PVs. This is mainly due to two reasons: first, their easy integration from technical and economic standpoint, and secondly, operating in combination with other applications decreases the PV's surface temperature which increases its photoelectric conversion efficiency dramatically [21]. This section reviews the recent studies regarding double-purpose and multi-purpose HPS systems.…”

Section: Multi-purpose Applicationsmentioning

confidence: 99%

“…Heat pipes are highly efficient thermal conductors with anti-freezing property, constant-temperature heat transfer, and high performance [17,18]. HPSCs have significant advantages over conventional solar collectors including uniform working fluid flow, almost isothermal heat absorption, very low hydraulic thermal resistance, low heat loss and high outlet temperature, and high efficiency even in unfavorable and cold climatic conditions [19][20][21]. In addition, if one tube breaks, the system can continue the operation while in other solar collectors, the whole system has to be halted for repair [22].…”

Section: Introductionmentioning

confidence: 99%

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Strategies to improve the thermal performance of heat pipe solar collectors in solar systems: A review

Shafieian

Khiadani

Nosrati

2019

Energy Conversion and Management

107

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Invention of evacuated tube heat pipe solar collectors (HPSCs) was a huge step forward towards resolving the challenges of conventional solar systems due to their unique features and advantages. This has led to their utilization in a wide range of solar applications surpassing other conventional collectors. However, relatively low thermal efficiency of heat pipe solar (HPS) systems is still the major challenge of solar industry evidenced by numerous studies conducted mainly during the last decade to improve their efficiency. To date, several review papers have been published summarizing studies relevant to utilization of HPSCs in various thermal applications. However, to the authors' knowledge, a comprehensive review which surveys and provides an overview of the studies undertaken to improve the thermal performance of HPS systems (mainly during the last decade) by implementing different strategies has not been published to date. This review paper summarizes all the proposed strategies to improve the thermal efficiency of different industrial, domestic, and innovative HPS systems. First, the concept, structure, and operational principles of HPSCs are introduced concisely. Then, novel structures and designs of HPSCs aiming to increase the thermal efficiency of the collector as the most important component of the solar system is reviewed. This is followed by a comprehensive review of various methods to store solar energy more efficiently, increase solar system's operation time, increase overall efficiency by turning the solar system into a multipurpose system, enhance heat transmission in the solar system, and implement new solar loop and heat pipe working fluids with better heat transfer characteristics. Finally, research gaps in this field are identified and some future research trends and directions are recommended.

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Performance Evaluation of Novel Heat Pipe‐Assisted Thermal Storage System with Parabolic Trough Solar Collector Using Nanofluid

et al. 2022

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Global advancement on experimental and thermal analysis of evacuated tube collector with and without heat pipe systems and possible applications

Cited by 142 publications

References 129 publications

A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

A cycling study for reliability, chemical stability and thermal durability of polyethylene glycols of molecular weight 2000 and 10000 as organic latent heat thermal energy storage materials

Strategies to improve the thermal performance of heat pipe solar collectors in solar systems: A review

Performance Evaluation of Novel Heat Pipe‐Assisted Thermal Storage System with Parabolic Trough Solar Collector Using Nanofluid

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