Effect of roughness geometries on heat transfer enhancement in solar thermal systems – A review

Gawande, Vipin B.; Dhoble, Ashwinkumar S.; Zodpe, D. B.

doi:10.1016/j.rser.2014.01.024

Cited by 66 publications

(19 citation statements)

References 75 publications

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“…The recent state of the art in this field is analysed by Gawande et al (2014). The recent state of the art in this field is analysed by Gawande et al (2014).…”

Section: Correlations For Heat Transfer and Friction Factormentioning

confidence: 99%

- Introduction

2015

Compact Heat Exchangers for Energy Transfer Intensification

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“…The recent state of the art in this field is analysed by Gawande et al (2014). The recent state of the art in this field is analysed by Gawande et al (2014).…”

Section: Correlations For Heat Transfer and Friction Factormentioning

confidence: 99%

- Introduction

2015

Compact Heat Exchangers for Energy Transfer Intensification

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“…Researchers (Bhushan and Singh [1], Chamoli et al [2], Prasad [3], Gawande et al [4]) have studied the performance enhancement of SAHs by using artificial roughness on the absorber plate.…”

Section: Introductionmentioning

confidence: 99%

Exergetic Performance Prediction of a Roughened Solar Air Heater Using Artificial Neural Network

2018

SV-JME

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Energy plays an essential role in the economic growth of a nation. Fossil fuels are limited and are becoming exhausted day-by-day, so it is necessary to develop alternative sources of energy. Among various types of renewable sources of energy, solar energy is one of the most abundant and clean sources. There are two ways of solar energy utilization: active and passive. A solar air heater (SAH) is in the category of active solar energy utilization. In the solar air heating system, the solar collector or absorber plate is the main component, which collects the solar radiation in the form of heat and transfers it to air flowing across it. Due to the lower value of heat capacity and low thermal conductivity of air, the convective heat transfer coefficient between the absorber plate and the air passing through it is low; thus, the major issue is to enhance the value of the heat transfer coefficient. One of the best techniques for enhancement of heat transfer coefficient is to use artificial roughness on the airflow side of the absorber plate. The use of roughness creates turbulence near the surface of absorber plate, which increases the heat transfer coefficient. Researchers (Bhushan and Singh) have studied the performance enhancement of SAHs by using artificial roughness on the absorber plate.The actual performance of SAH can be evaluated by the implementation of both energy and exergy analyses. The energy analysis alone does not give the direction of the process implementation and the information about the quality of various kinds of energies involved in the system. It also does not indicate the various internal irreversibilities. These problems are overcome by using exergy analysis [5] to [8]. In view of this, in the present investigation, the exergy analysis of roughened SAH has been carried out.Recently 0.99584, 0.99997, 0.99517, 0.99997 and 0.99983

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“…The main disadvantages are, nonetheless, its lower density and lower thermal capacity, as well as its lower heat conductivity [7][8][9]. To overcome this, extensive work is being developed to enhance heat transfer, through different designs of the solar air collector [5,7] and roughness of the absorber in the form of obstacles of different shapes and sizes, like ribs and fins [7,10].…”

Section: Introductionmentioning

confidence: 99%

Alternative for Summer Use of Solar Air Heaters in Existing Buildings

et al. 2017

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Among solar thermal technologies for indoor heating, solar air heaters (SAH) are appealing for implementation on existing buildings due to their simplicity, fewer risks related to the working fluid, and possible independence from the building structure. However, existing research work mainly focuses on winter use and still fails in providing effective solutions for yearly operation, which would enhance their interest. With the aim of analysing an alternative summer use, this work firstly characterises a double channel-single pass solar air collector through experimentation. From the obtained results, modelling and simulation tasks have been conducted to evaluate the possibilities of using hot air, provided by the SAH, while operating under summer conditions within a closed loop, to feed an air-to-water heat exchanger for domestic hot water (DHW) production. The system is studied through simulation under two different configurations for a case study in Valladolid (Spain), during the period from May to September for different airflows in the closed loop. Results show that daily savings can vary from 27% to 85% among the different operating conditions; a configuration where make-up water is fed to the heat exchanger being preferable, with a dedicated water tank for the solar heated water storage of the minimum possible volume. The more favourable results for the harshest months highlight the interest of extending the use of the solar air heaters to the summer period.

show abstract

Effect of roughness geometries on heat transfer enhancement in solar thermal systems – A review

Cited by 66 publications

References 75 publications

- Introduction

- Introduction

Exergetic Performance Prediction of a Roughened Solar Air Heater Using Artificial Neural Network

Alternative for Summer Use of Solar Air Heaters in Existing Buildings

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