Numerical analysis of an integrated storage solar heater

Hamed, Mouna Ben; Fallah, Ali; Brahim, Ammar Ben

doi:10.1016/j.ijhydene.2016.07.116

Cited by 32 publications

(8 citation statements)

References 27 publications

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“…ICS-SWH systems are often affected by their poor overnight performance as their thermal output decreases as the time increases between the availability of solar energy and its use [22,24]. Many strategies have been proposed to make ICS-SWHs more viable alternatives which include incorporation of: night insulation cover [24,25], transparent insulation [26][27][28], baffle plate [29][30][31][32][33], reflectors or concentrators [94][95][96]98], phase change materials [34][35][36][37][38][39][99][100], and multiple glazing layers [3,40]. Developing an efficient storage tank design is yet another strategy to enhance the performance of the ICSSWHs.…”

Section: Ics-swhs Designsmentioning

confidence: 99%

“…These systems are simple, but are characterised by relatively low thermal conversion efficiency. The overall efficiency of ICS-SWHs is strongly related to their capability to capture solar radiation, store the energy collected as well as to their ability to supply hot water at a constant temperature during the discharging phase (draw-off) [44,62,99]. Several studies on ICS-SWHs have been performed showing the correlation between good collector performance and high levels of stratification within the storage tank when operated with no or infrequent large draw-offs [5,33,[63][64][65][66][67][68][69][70][71][72][73].…”

Section: Present Researchmentioning

confidence: 99%

“…In particular, the Computational Fluid Dynamic (CFD) analysis gave an insight of the internal flow and heat transfer regimes, allowing to understand the mechanism inside the collector and thermal characteristics of the newly proposed design; and to help specify a control system to take a more refined approach to meeting end user demand while minimizing auxiliary energy requirements while maximizing total yield from an array of units. Even if similar studies have been conducted on ICS-SWHs [92][93][99][100], none of them can be readily referred to ICS applications with such configurations. On the other hand, experiments gave an indication of the new collector's thermal characteristics / performance against a formerly developed prototype using empirical testing assessing the main bulk water temperature achieved, stratification and energy storage and loss rates during heating and cooling cycles under steady state operations.…”

Section: Present Researchmentioning

confidence: 99%

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Numerical and empirical evaluation of a novel building integrated collector storage solar water heater

2018

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Integrated collector storage is a long established simple low cost solar water heater configuration combining the solar collector with a storage tank into a single unit. Previous studies have shown the potential of integrated collector storage solar water heaters to significantly reduce domestic energy requirements for water heating, however challenges still remain to integrate them in roof/façades and ensure appropriate domestic hot water demand. In this article, a novel integrated collector storage solar water heaters is being investigated. The configuration and geometry proposed incorporates an embedded heating element to provide a self-contained domestic hot water system and consider roof integration restriction allowing the unit to be embedded within a structural insulated roofing panel system. The proposed system also utilizes an inlet diffuser designed to reduce the disruption to the stratification within the storage during and following draw-off. This article presents a Computational Fluid Dynamic analysis of internal flows and heat transfer regimes within this new collector configuration and compares its performance against previous developed prototypes using empirical testing. The increased aspect ratio of the new design was shown to significantly alter the heating and cooling characteristics of the collector, both gaining and loosing heat at a greater rate than the original prototype. The computational analysis showed that the collector charges effectively with some stratification. Higher draw-off rates however resulted in higher bulk water outlet temperatures, providing better energy delivery efficiency. The inlet diffuser was also shown to improve the thermal efficiency of the unit overall. The empirical testing shows the improvement in performance of this novel integrated collector storage solar water heaters against previous developed prototypes. The study highlights the need to review the effect of draw-off regime upon the performance of such systems in order to identify optimal regime and control strategy.

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Section: Ics-swhs Designsmentioning

confidence: 99%

Section: Present Researchmentioning

confidence: 99%

Section: Present Researchmentioning

confidence: 99%

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Numerical and empirical evaluation of a novel building integrated collector storage solar water heater

2018

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“…Abu‐Hamdeh et al 36 used paraffin wax‐graphene and paraffin wax‐graphene oxide in FPC and reported the results for improved thermal conductivity and thermal performance in graphene‐based paraffin wax as compared to pure paraffin. A lot of similar research has been carried out in the last few years, which has shown the efficiency improvement with TES storage in such solar thermal collectors 37‐40 . Recently, nanocomposite PCMs have also been used to improve the thermal conductivity and thermal energy storage (TES) of FPC systems 41‐45 …”

Section: Introductionmentioning

confidence: 99%

Real‐time thermal performance investigation of a thermal energy storage integrated direct absorption solar collector under tropical climate

Gupta,

Kumar,

Kukreja

et al. 2024

Energy Storage

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In the last two decades, metallic particles of nano sizes (~10−9 m) have been tested profoundly in volumetric absorption solar collectors (VASC) due to their excellent optical properties and broadband absorption in the entire solar spectrum. However, very limited studies are available for understanding the performance of integrated energy storage VASC systems using nanofluids. For the experimental work presented here, a hybrid nanofluid of gold nanoparticles in Azadirachta indica leaves extract has been synthesized by chemical route. The prepared hybrid nanofluid has shown good absorption in 400 to 700 nm wavelength range and hence achieved high photo‐thermal conversion efficiency for tested VASC system. Furthermore, commercially available paraffin wax is used as a phase change material (PCM) in thermal energy storage (TES) and further integrated with VASC to analyze the thermal performance of the system even after sunshine hours. The real‐time experiments were conducted using different working fluids, and at three mass flow rates, that is, 0.008 kg/s, 0.016 kg/s, and 0.033 kg/s, respectively, during mild winter days in the tropical climate of India. The study revealed a photo‐thermal efficiency enhancement of about 17.1% when hybrid heat transfer fluid was used in the VASC system with TES as compared to base fluid water but without TES. During the heating period, the maximum thermal gain of the hybrid nanofluid was observed to be about 15°C higher than the ambient temperature at mass flow rate of 0.033 kg/s. Thermal efficiency enhancement of about 23.8%, 24%, and 24.1% was observed with hybrid nanofluid compared to base fluid water at a mass flow rate of 0.008 kg/s, 0.016 kg/s, and 0.033 kg/s, respectively, when PCM was kept inside the tank. Furthermore, a maximum zero loss efficiency of 83.8% was estimated at an optimal mass flow rate of 0.033 kg/s for the TES‐integrated VASC system.

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“…In addition, the surface of the aluminum structure inside the heater is coated in black to facilitate solar energy absorption, improving the performance of the heater [9]. Accordingly, studies were conducted to store solar heat using phase change materials (PCM) during the daytime and to use the solar air heater for extended periods using stored heat even in the nighttime [10,11]. Due to different melting points depending on the materials, various PCM types have been used for space heating in buildings or heat sinks of electronic devices [12].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly and Economical Solar Heater Design Using Internal Structure and Phase Change Materials

Lee¹,

Son²,

Kim³

2021

Energies

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Indoor heating systems currently used are highly dependent on fossil fuels; hence, it is urgent to develop a new heating system to achieve carbon zero-emission. A solar air heater is eco-friendly because it generates nearly zero greenhouse gases. In this study, a parametric study was conducted for optimizing solar air heater design applicable to indoor heating. Installing the internal structure in the solar heater changes the interior flow characteristic, resulting in the air temperature increased by about 14.2 K on average compared to the heater without the internal structure. An additional case study was carried out to optimize the ideal quantity of phase change materials (PCM) in terms of mass fraction and heat capacity for various operating conditions. An excessive amount of PCM (e.g., 66% of the storage space filled with PCM) deteriorates the performance of the air heater unless the entire PCM could be melted during the daytime. After heating, the air temperature was maintained the longest when only 33% of the internal space was filled with PCM. The solar air heater can fully replace or partly assist a conventional heater for indoor heating, and it could reduce approximately 0.6 tCO2 per year.

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Numerical analysis of an integrated storage solar heater

Cited by 32 publications

References 27 publications

Numerical and empirical evaluation of a novel building integrated collector storage solar water heater

Numerical and empirical evaluation of a novel building integrated collector storage solar water heater

Real‐time thermal performance investigation of a thermal energy storage integrated direct absorption solar collector under tropical climate

Eco-Friendly and Economical Solar Heater Design Using Internal Structure and Phase Change Materials

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