Optical and thermal performances improvement of an ICS solar water heater system

Benrejeb, Raouf; Helal, Olfa; Chaouachi, Béchir

doi:10.1016/j.solener.2014.11.011

Cited by 19 publications

(5 citation statements)

References 19 publications

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“…The results illustrated that the upper part of the source reserve absorbed the majority of the reflected radiation. The first study on optical performance of an ICS heater was published in 2015 [28]. The results of this study provided a significant improvement in optical efficiency and the distribution of radiation absorption with various solar slope angles.…”

Section: Introductionmentioning

confidence: 94%

Analysis of the thermal efficiency of a compound parabolic Integrated Collector Storage solar water heater in Kerman, Iran

Panahi

Khanjanpour

Akrami

et al. 2019

Sustainable Energy Technologies and Assessments

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This paper presents an experimental study involving the design, manufacturing and testing of a prototype integrated collector storage (ICS) solar water heater (SWH) in combination with a compound parabolic concentrator (CPC). The thermal efficiency of the developed system is evaluated in Kerman (latitude 30.2907°N, longitude 57.0679°E), Iran. The developed system is intended to supply hot water for a family in remote rural areas. A 6-month experimental study was undertaken to investigate the performance of the ICS SWH system. The mean daily efficiency and overnight thermal loss coefficient of each experiment were analyzed to examine the appropriateness of these collectors for regions in Kerman. The results showed that mirror has the highest mean daily efficiency (66.7%), followed by steel sheet (47.6%) and aluminum foil (43.7%). The analysis of hourly and monthly operation diagrams for variations of water temperature for the developed ICS system showed that by increasing the amount of radiation entering the water heater, the thermal efficiency of the system decreases, such that the highest efficiency was in April and the lowest in July. With the distribution of radiation intensity in the months of August and September, the thermal efficiency of the system increased. This regional study illustrates how selecting a proper concentrator can increase the thermal efficiency of this solar-based system. It also shows how the temperature gradient between the ambient air and internal water in the storage tank can influence the performance of such systems, and how a controlled amount of hot water withdrawal can affect the system's efficiency. Developing the ICSSWH system is an ideal sustainable solution in countries that benefit from a large amount of solar intensity.

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Section: Introductionmentioning

confidence: 94%

Analysis of the thermal efficiency of a compound parabolic Integrated Collector Storage solar water heater in Kerman, Iran

Panahi

Khanjanpour

Akrami

et al. 2019

Sustainable Energy Technologies and Assessments

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show abstract

“…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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“…Lia [13] carried out an experiment on the performance of the storage tanks in a SDWHS by studying discharging and charging efficiency. Some scholars are interested in new technology applied to SDWHSs; e.g., Benrejeb [14] presented an integrated collector storage solar water heater combined with a compound parabolic concentrator in order to improve the thermal performance of SDHWSs. Xue [15] researched the thermal performance of a domestic solar water heater with solar collector coupled phase-change energy storage.…”

Section: State Of the Artmentioning

confidence: 99%

Performance Analysis of a Collective Solar Domestic Water - Heating System in the Temperate Zone of Yunnan Province, China

Zhou¹,

Wang²,

Li³

et al. 2016

JESTR

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Making a choice between a collective solar domestic water-heating system (CSDWHS) with a single water tank and one with double water tanks is a complicated problem for designers to solve, since it involves many influencing factors, such as cost, function, maintenance, etc. In this paper, a comparison of thermal performance of these two systems based on testing data was made in order to give some guidance to designers. Firstly, a CSDWHS with double water tanks installed in Yuxi,

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Optical and thermal performances improvement of an ICS solar water heater system

Cited by 19 publications

References 19 publications

Analysis of the thermal efficiency of a compound parabolic Integrated Collector Storage solar water heater in Kerman, Iran

Analysis of the thermal efficiency of a compound parabolic Integrated Collector Storage solar water heater in Kerman, Iran

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

Performance Analysis of a Collective Solar Domestic Water - Heating System in the Temperate Zone of Yunnan Province, China

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