Integration of evaporative cooling technique with solar chimney to improve indoor thermal environment in the New Assiut City, Egypt

Abdallah, Amr Sayed Hassan; Yokota, Hiroshi; Goto, Tomonobu; Enteria, Napoleon; Radwan, Magdy Mohamed; Eid, M. A.

doi:10.1186/2251-6832-4-45

Cited by 33 publications

(14 citation statements)

References 11 publications

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“…Also, very few cases were found for passive heating using solar walls in Egypt (Hassanain et al, 2011) outside of agriculture purposes in green houses. No robust studies were found for the applicability of solar walls for residential buildings in the Egyptian climate except for a numerical study for using a solar chimney in passive cooling (Abdallah et al, 2013) and some recommendations by individual practitioners for solar passive heating (Ibrahim, 2011). In addition, no reliable research was found on the economic feasibility of using passive solar techniques in heating and cooling or specifically using the Trombe wall in Egypt.…”

Section: Previous Studiesmentioning

confidence: 99%

Ventilated Trombe wall as a passive solar heating and cooling retrofitting approach; a low-tech design for off-grid settlements in semi-arid climates

Dabaieh

Elbably

2015

Solar Energy

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. (2015). Ventilated Trombe wall as a passive solar heating and cooling retrofitting approach; a low-tech design for off-grid settlements in semi-arid climates. Solar Energy, 122, 820-833. https://doi.org/10.1016Energy, 122, 820-833. https://doi.org/10. /j.solener.2015 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractIn the coming years, it is anticipated that if we continue with the same pace of energy consumption, communities will continue to face three major challenges; a mounting increase in energy demands, pollution, and global warming. On a local scale, Egypt is experiencing one of its most serious energy crises in decades. The energy consumed in indoor cooling and heating is the biggest portion of total energy consumption in residential buildings. This paper is an experimental simulation study for building retrofitting in off-grid settlements in semi-arid climates, using Trombe wall as a low-tech passive heating and cooling solution. In this study, we made developments to the conventional classic Trombe wall using occupant-centered design and living lab experimental methods. The thermal efficiency of the proposed Trombe wall design is simulated during winter and summer peaks. In the proposed design we used gray paint instead of typical black paint in addition to 15 cm reversible natural wool insulation and two 3 mm thick roll-up wool curtains. The new design reduced the heating load by 94% and reduced the cooling load by 73% compared to the base case with an annual energy savings of 53,631 kW h and a reduction in CO 2 emissions of 144,267 kg of CO 2 . The living lab test proved that the proposed design of the Trombe wall is economically viable and the payback time is 7 months. It is recommended that the proposed design be monitored for a whole year to have an accurate assessment of its efficiency. A post occupancy evaluation is also needed to measure local residents' acceptance and perceived comfort after retrofitting.

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Section: Previous Studiesmentioning

confidence: 99%

Ventilated Trombe wall as a passive solar heating and cooling retrofitting approach; a low-tech design for off-grid settlements in semi-arid climates

Dabaieh

Elbably

2015

Solar Energy

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“…It was concluded that a serious problem of discomfort exists inside houses in projects of new Assiut city based on natural ventilation strategy only [6][7][8][9]. Traditional passive techniques were used in ancient architectures to achieve the desired summer comfort without the need for mechanical cooling systems [10].…”

Section: Introductionmentioning

confidence: 99%

“…Developing solar chimney with direct evaporative cooling tower using numerical simulation was done using COMIS-TRNSYS software to provide indoor thermal comfort under the climatic conditions of Assiut, Egypt. The results show that the system generates 130.5 m 3 /h with indoor thermal comfort of 80% acceptable range [7,8]. Macias et al developed a passive cooling system for a residential building.…”

Section: Introductionmentioning

confidence: 99%

New Passive Cooling as a Technique for Hot Arid Climate

Abdallah¹

2018

Energy Systems and Environment

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Cooling of buildings is an essential target for engineers and builders in the hot arid climate of Egypt. New cooling system was integrated into a single room built in Assiut University (El-Gorib site) in Assiut, Egypt. A passive cooling technique was integrated inside a short wind tower made from expanded paper (wet pad) 0.1 m thick. A water tube was installed on the top of the expanded paper with small nozzles. The results show that outlet air temperature from the wind tower is 27.3°C. The calculated predicted mean vote (PMV) is within the recommended range (−0.5 < PMV < +0.5). This indicates that occupants remain satisfied with indoor thermal environment after using the passive cooling system and the difference is nearly 6-7 K between outdoor and indoor. The system achieves the acceptable airflow rate with an average of 450 ppm for CO 2 concentration during daytime. The relative humidity did not exceed 57% most of the time. The maximum airspeed inside the solar chimney was 3.5 m/s under the effect of a high solar radiation of 890 W/m 2 . The findings show that solar chimney with passive cooling tower design (SCPC) system achieves comfortable thermal conditions with a significant improvement in building energy conservation.

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“…Consequently, current work undertaken within the field encourages stronger promotion for the exploitation of this resource, particularly in sunny regions like the Mediterranean climate [1][2][3], where solar systems can be an efficient and economical alternative to fossil fuels [4].…”

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.

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Integration of evaporative cooling technique with solar chimney to improve indoor thermal environment in the New Assiut City, Egypt

Cited by 33 publications

References 11 publications

Ventilated Trombe wall as a passive solar heating and cooling retrofitting approach; a low-tech design for off-grid settlements in semi-arid climates

Ventilated Trombe wall as a passive solar heating and cooling retrofitting approach; a low-tech design for off-grid settlements in semi-arid climates

New Passive Cooling as a Technique for Hot Arid Climate

Alternative for Summer Use of Solar Air Heaters in Existing Buildings

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