Numerical analysis of charging and discharging performance of an integrated collector storage solar water heater

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

doi:10.1016/j.ijhydene.2016.11.179

Cited by 15 publications

(6 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%

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%

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

2018

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“…Therefore, the stored latent energy is released as the PCM change phase and revert back to their original state. There are different classes of PCM including organic compounds, inorganic materials, and eutectic mixtures [86]. One of the benefits of PCM is that, by storing excess energy, the heat losses that occur when the collector is at its highest temperature are reduced, thus enhancing system efficiency [87].…”

Section: Phase Change Materials (Pcm)mentioning

confidence: 99%

“…The thermal efficiency of the system without PCM is only slightly higher during the collection period but drops below the PCM configurations overnight. Hamed et al [86] also did a numerical study, analysing the charging and discharging performance of a rectangular ICSSWH. The type of PCM used in the calculations was not stated, only the thermophysical properties.…”

Section: Phase Change Materials (Pcm)mentioning

confidence: 99%

“…Choosing the right type of PCM and the position within an ICS system is crucial to its effective function [89]. Also, the evaporation associated with certain types of PCM requires enormous changes in volume of the storage materials making storage complex and impractical [86]. Many organic PCMs have a low rate of heat transfer as well as low thermal conductivity and for small scale applications, such as domestic solar water heating, the cost of this technology is still too great [85].…”

Section: Phase Change Materials (Pcm)mentioning

confidence: 99%

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Thermal Performance through Heat Retention in Integrated Collector-Storage Solar Water Heaters: A Review

et al. 2018

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Solar thermal systems are a long-standing technology that is receiving increased attention, in terms of research and development, due to ambitious climate change targets and the need for renewable energy solutions. Integrated collector-storage solar water heaters (ICSSWHs) are a potential contributing solution and numerous studies have focussed on the optimisation of their thermal performance and efficiency. A major drawback of these systems is the heavy heat losses experienced during non-collection periods. To combat this, various heat retention strategies have been proposed and evaluated, including baffles plates, additional insulation, multiple glazing layers, selective coatings, and phase change materials. This paper aims to bring together these studies through a systematic review of the existing literature surrounding the performance of ICSSWH systems, focusing on heat retention. This review provides a comprehensive and up-to-date point of reference on relevant research and developments for researchers in this field.

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“…Zhang et al studied the performance for water-in-glass evacuated tube solar water heaters and found the temperature rise of about 45°C after one day of heat collection [19]. Hamed et al integrated the phase change material with a solar collector and increased PCM thickness from 0.005 m to 0.025 m in turn the daily energy efficiency of storage collector raised from 76.98% to 82.42% [20]. The temperature difference across the collector was found to be 2-30°C [21] for domestic solar hot water storage system and 2-10°C for the conventional system [22].…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis of building roof assisted with water heater and insulation material

Prakash

2018

Sādhanā

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Traditional roof systems are constructed with concrete and weathering coarse layer and these roof systems absorb and reflect a certain amount of solar radiation. The absorbed solar energy is transferred into building indoor and causes significant discomfort to the occupants. Also, this solar energy gets dissipated without any useful energy conversion. Hence this paper is focused to use the available solar energy effectively through a novel solar water heating system and the transfer of heat in the building indoor is arrested by proper roof insulation material. The modified insulated roof with the solar water heater is designed and simulated numerically in commercial computational fluid dynamics code with validation. Through this study, the factors that affect the performance of solar water heating system and thermal insulation capacity are analysed and the best design of the modified roof system is identified. The modified roof system produces 25 L of hot water per day with a temperature raise of 60°C in the winter season. Also, the same roof system maintains the ceiling temperature at about 27°C for a complete day in a summer season.

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Numerical analysis of charging and discharging performance of an integrated collector storage solar water heater

Cited by 15 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

Thermal Performance through Heat Retention in Integrated Collector-Storage Solar Water Heaters: A Review

Thermal analysis of building roof assisted with water heater and insulation material

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