A mathematical model of thermal performance of a solar air heater with slats

Ammari, Handri

doi:10.1016/s0960-1481(02)00253-7

Cited by 65 publications

(16 citation statements)

References 11 publications

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“…When comparing these efficiencies to the ones of Ammari [6], performed on similar SAHs, similar results can also be observed: for an irradiation of about 850 W/m 2 and 180 m 3 /h airflow, the average efficiency exceeds 0.7. Efficiencies obtained here are better than the ones achieved by Budea [1] from a similar system, which scarcely reach 45% for irradiations of about 850 W/m 2 , although no specific information on the operating airflows is given in this case.…”

Section: Discussionsupporting

confidence: 71%

“…Concerning solar thermal energy technologies, the use of air as the working fluid has some advantages: no risk of freezing in winter, no damage due to overheating in summer, no adverse effect of small leakage, corrosion is less critical, and the installation is simpler due to the unneeded additional heat exchanger for the final application [5,6]. The main disadvantages are, nonetheless, its lower density and lower thermal capacity, as well as its lower heat conductivity [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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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.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Alternative for Summer Use of Solar Air Heaters in Existing Buildings

et al. 2017

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“…We find ''louvered'' metal sheets [43][44][45][46][47][48], finned metal sheets [32,47,49,50,[56][57][58] until the arrival of the porous absorber. These modifications are shown in Fig.…”

Section: Energy Transfer To the Heat-transfer Fluidmentioning

confidence: 99%

Solar timber kilns: State of the art and foreseeable developments

Luna

Nadeau

Jannot

2009

Renewable and Sustainable Energy Reviews

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“…The energy conservation equation over the inclined part of the rib is considered as a classical fin case (Ammari, 2003). The node T o is taken as the average temperature of this inclined wall.…”

Section: The Inclined Part Of the Ribmentioning

confidence: 99%

“…The convective heat exchange coefficient between the cells surface and the ambient air can be obtained by the formula (Ammari, 2003):…”

Section: Heat Balance N°2mentioning

confidence: 99%