Exergy analysis of domestic-scale solar water heaters

Wang, Xiaowu; Ben, Hua

doi:10.1016/j.rser.2004.04.007

Cited by 87 publications

(35 citation statements)

References 2 publications

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“…The governing equations are discretized on uniform or non-uniform mesh and the discretized equations are then solved with using various methods. Rate of heat transfer and thermal efficiency are obtained for various pertinent parameters [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Comparative Study between 2D and 3D Modeling of Nanofluid Filled Flat Plate Solar Collector

Nasrin¹,

Алим²,

Ahmed³

2016

IJHT

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An attempt is being paid in this paper to numerically analyze the solar thermal collector for better understanding of the heat transfer capabilities of the collector using water as well as water based Cu nanofluid. In the present work 2D and 3D models of the flat plate solar collector (FPSC) are taken into account. Finite Element method is used to solve governing equations with appropriate boundary conditions. Code validation of numerical study is shown in this article. Heat transfer and flow characteristics are presented in terms of the average heat transfer, mean velocity, collector efficiency and mean outlet temperature of fluids. Then various comparisons are shown to establish the importance of 3D numerical study instead of 2D study.

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Section: Introductionmentioning

confidence: 99%

Comparative Study between 2D and 3D Modeling of Nanofluid Filled Flat Plate Solar Collector

Nasrin¹,

Алим²,

Ahmed³

2016

IJHT

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“…Solar water heaters are the most popular means of solar energy utilization because of technological feasibility and economic attraction compared with other kinds of solar energy utilization. Solar water heater technology has been well developed and can be easily implemented at low cost [5].…”

Section: Introductionmentioning

confidence: 99%

Validated TRNSYS model for forced circulation solar water heating systems with flat plate and heat pipe evacuated tube collectors

Ayompe¹,

Duffy²,

McCormack³

et al. 2011

Applied Thermal Engineering

143

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a b s t r a c tThis paper presents a validated TRNSYS model for forced circulation solar water heating systems used in temperate climates. The systems consist of two flat plate collectors (FPC) and a heat pipe evacuated tube collector (ETC) as well as identical auxiliary components. The systems were fitted with an automated unit that controlled the immersion heaters and hot water demand profile to mimic hot water usage in a typical European domestic dwelling. The main component of the TRNSYS model was the Type 73 FPC or Type 538 ETC. A comparison of modelled and measured data resulted in percentage mean absolute errors for collector outlet temperature, heat collected by the collectors and heat delivered to the load of 16.9%, 14.1% and 6.9% for the FPC system and 18.4%, 16.8% and 7.6% for the ETC system respectively. The model underestimated the collector outlet fluid temperature by À9.6% and overestimated the heat collected and heat delivered to load by 7.6% and 6.9% for the FPC system. The model overestimated all three parameters by 13.7%, 12.4% and 7.6% for the ETC system. Q1

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“…In fact, the Andalusian Regional Government (Junta de Andalucía, 1991) prohibited the installation of double cover panels for hot water production. However, other authors report advantages with double covers when ambient temperatures are very high (Portillo, 1985;De Andrés et al, 1991;Xiaowu and Ben, 2005). In the present work, double covers were associated with the higher soil temperatures, energy accumulation and energy performance, although with an added economic cost.…”

Section: Resultsmentioning

confidence: 37%

Use of flat plate solar collectors and parabolic trough concentrators for greenhouse soil disinfestation

Reyes

Porras-Soriano

Martín³

2009

Span. j. agric. res.

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The aim of the present work was to investigate the use of low and medium temperature active solar energy systems for the disinfestation of greenhouse soils. Four flat plate solar collectors (low-temperature solar thermal energy devices) and six parabolic trough concentrators (medium-temperature solar thermal energy devices) were used to heat water, which, via a buried heat exchange system, was used to heat the soil of greenhouse plots. These treatments were compared to no solar (control) and solarized (using a 50 µm-thick transparent polyethylene sheet) plots. Experiments performed in the summers of 2004 and 2005 showed that: 1) the temperatures reached and the energy accumulated in the soil -and therefore the disinfestation capacity -were greater with either of the active solar treatments (40-60ºC and 10.222.438-18.102.054 J, respectively) than with solarization (< 40ºC and 6.628.760 J, respectively) and 2) the temperatures reached using the parabolic trough concentrators (50 -60ºC) were higher than those achieved with the flat plate solar collectors (40-50ºC). The soil temperatures reached suggest these systems could be used to disinfest greenhouse soils.Additional key words: soil heating, soil treatment, solarization. Resumen Desinfestación de suelos de invernadero con colectores solares planos y concentradores cilíndrico-parabólicosEl objetivo de este trabajo fue investigar el uso de sistemas de energía solar activa de baja y media temperatura en la desinfestación de suelos de invernadero. Se usaron cuatro paneles solares planos y seis concentradores cilíndrico-parabólicos para calentar agua, la cual, a través de un intercambiador de calor enterrado, aumentó la temperatura del suelo de los bancales de un invernadero. Estos tratamientos se compararon con un bancal testigo y otro solarizado con una lámina de polietileno transparente de 50 µm. Los resultados de los ensayos realizados durante los veranos de 2004 y 2005 demuestran que: 1) las temperaturas alcanzadas y la energía acumulada en el suelo y, por tanto, la capacidad de desinfestación del sistema como consecuencia de los tratamientos solares activos (40-60ºC y 10.222.438-18.102.054 J, respectivamente) fueron superiores a las del suelo sometido a solarización (< 40ºC y 6.628.760 J, respectivamente) y 2) las temperaturas alcanzadas usando concentradores cilíndrico-parabólicos (50-60ºC) fueron superiores a las obtenidas con paneles solares planos (40-50ºC). Las temperaturas obtenidas en el suelo sugieren que estos sistemas pueden usarse eficientemente para la desinfestación de suelos de invernadero.Palabras clave adicionales: calentamiento del suelo, solarización, tratamiento del suelo.Abbreviations used: LDR (light-dependent resistors).

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Exergy analysis of domestic-scale solar water heaters

Cited by 87 publications

References 2 publications

Comparative Study between 2D and 3D Modeling of Nanofluid Filled Flat Plate Solar Collector

Comparative Study between 2D and 3D Modeling of Nanofluid Filled Flat Plate Solar Collector

Validated TRNSYS model for forced circulation solar water heating systems with flat plate and heat pipe evacuated tube collectors

Use of flat plate solar collectors and parabolic trough concentrators for greenhouse soil disinfestation

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