Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector

Souliotis, Manolis; Quinlan, Patrick; Smyth, Mervyn; Tripanagnostopoulos, Y.; Zacharopoulos, Aggelos; Ramírez, Miguel Ángel Artacho; Yianoulis, P.

doi:10.1016/j.solener.2011.07.005

Cited by 70 publications

(48 citation statements)

References 27 publications

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“…Parameter (z) shows its quality; high values of this collector lead quality collector, while low values mean low quality. These quantities are determined below by Equations (18) and (19).…”

Section: Total System Energy Balancementioning

confidence: 99%

A Realistic Approach of the Maximum Work Extraction from Solar Thermal Collectors

Bellos

Tzivanidis

2018

ASI

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Abstract:In this study, the maximum work extraction from the incident solar energy on solar thermal collectors is investigated by coupling solar collectors with a Carnot machine. A simplified thermal model for the solar collector performance is developed in which the radiation losses play a significant role. In every examined case, the optimum operating temperature that leads to maximum work extraction is calculated. The final results are presented parametrically, covering a great variety of real solar collectors. Moreover, the validation procedure of the developed model proves high accuracy. The results show that non-concentrating collectors should operate up to 400 K while concentrating collectors in higher temperature levels. More specifically, a parabolic trough collector can operate efficiently in temperature levels up to 850 K, while solar dish collectors can operate efficiently in temperature levels up to 1100 K. The results of this study can be exploited for the preliminary design and optimization of solar thermal systems. Moreover, a clear and realistic upper limit concerning the exergy production of solar irradiation with solar thermal collectors is given.

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“…Parameter (z) shows its quality; high values of this collector lead quality collector, while low values mean low quality. These quantities are determined below by Equations (18) and (19).…”

Section: Total System Energy Balancementioning

confidence: 99%

A Realistic Approach of the Maximum Work Extraction from Solar Thermal Collectors

Bellos

Tzivanidis

2018

ASI

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“…Among the various applications of this renewable energy, solar water heater are most widespread because their simplicity and the high requirements out of domestic hot water. Usually, a solar water heater is composed of two major parts: the solar water collector (the panel) and the heat storage realized by a cumulus filled with water [1][2][3]. The transfer of heat between the two parts is done either by thermosiphon, or by forced water circulation.…”

Section: Introductionmentioning

confidence: 99%

Comparison Between the Concrete, Sand, Clay, Water and the Paraffin like Materials of Heat Storage for the Solar Water Heaters

Slama¹,

Moumen²,

Elgoul³

2017

IJECEC

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Solar energy, though renewable, still has a handicap of heat storage, particularly for the solar water heaters with integrated storage. Indeed, these latter present a significant night cooling. The storage material nature can influence the lifespan of the storage tanks, the quantity of stored heat and its speed of restitution. We compare here five materials for the heat storage which are sand, concrete, clay, Phase Change Material (PCM) and water like element of reference for comparisons. As for the PCM used here, it is paraffin sold in the trade, though other materials admit an enthalpy of higher fusion. If during the diurnal heating, the PCM does not reach the highest temperatures, it is because received solar energy is used for its change of state.However, from a viewpoint amount of stored heat, PCM is the best view of its high latent heat. Also for well as night cooling, the PCM keeps the temperature elevated.

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“…In this study the titled angle of the cpc parts was investigated in order to optimize the collector and the final results showed better performance than the respect linear collector. Souliotis and Tripanagnostopoulos have investigated the performance of stationary asymmetric cpc in Greece for heating water [15][16][17][18]. Su et al [19] made a comparison of a novel lens-walled compound parabolic concentrator (lens-walled CPC) with the common mirror and dielectric solid CPCs for yearly utilization.…”

Section: Introductionmentioning

confidence: 99%

Optical Performance and Optimization of Two Stationary Compound Parabolic Collectors (CPC)

Bellos¹,

Tzivanidis²,

Antonopoulos³

2016

Proceedings of the World Congress on Momentum, Heat and Mass Transfer

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-Solar energy utilization is very important for our society in order to reduce the environmental problems. Solar collectors are the heat exchanger devices which capture the solar energy and produce useful heat from this. In this study, two stationar y compound parabolic collectors with tubular receivers are optimized and compared in order to determine the most suitable solution for yearly utilization. The fist cpc uses one reflector in order to concentrate the solar rays to the receiver and the other uses two reflectors in order to follow the solar position during the year. The shape of every reflector is parametrized with Bezier-Bernstein polynomials in order to optimize them. The reflectors are stationary without tracking in order to reduce the cost of them and to have a simple and lowcost technology. A typical day for every month is analyzed in order to cover all the year period and the total analysis is made with Solidworks flow simulations studio. The collectors are located in Athens with latitude 38 o and they are placed with zero azimuth angles in order to be turned in the south direction. The final results are evaluated yearly and monthly by comparing the energy that is delivered to the tubular receiver. The single reflector performs 3.2% better than the double, but the double gives a better distribution among the months. So the most suitable solution is the cpc with the double reflector in order to produce useful heat in all months with a similar way.

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Heat retaining integrated collector storage solar water heater with asymmetric CPC reflector

Cited by 70 publications

References 27 publications

A Realistic Approach of the Maximum Work Extraction from Solar Thermal Collectors

A Realistic Approach of the Maximum Work Extraction from Solar Thermal Collectors

Comparison Between the Concrete, Sand, Clay, Water and the Paraffin like Materials of Heat Storage for the Solar Water Heaters

Optical Performance and Optimization of Two Stationary Compound Parabolic Collectors (CPC)

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