Impact of passive cooling techniques on energy demand for residential buildings in a Mediterranean climate

A significant portion of energy consumed in buildings is due to energy usage by heating, ventilation, and air conditioning systems. Free cooling is a good option for energy savings in the systems. In recent years, scientists, engineers, and architects designed successful and innovative buildings which use passive cooling techniques, such as natural ventilation. The house studied in the present work, is a pilot project undertaken jointly by the Centre for Development of Renewable Energies (CDER) and the National Centre for Studies and Research of the integrated building (CNERIB) in the framework of the MED-ENEC project (Mediterranean Energy Efficiency in Construction structure). The house under consideration has a surface area of 65 m 2 and is located in the region of Algiers which characterized by a Mediterranean climate with relatively mild winters and a hot and humid summer. The aim of this work is to study the thermal comfort inside the house in summer without air conditioning systems, only ventilation is considered. The aim of this work is to study the effect of natural ventilation on both thermal and hygrometric comfort inside the house during the summer period. Numerical simulation is made using the TRNSYS software and the results obtained are in good agreement with measured values. The prototype home is designed in a way that natural ventilation allows thermal comfort which induced energy saving from air conditioning. The mean temperature measured in the interior of the house is 26 °C. The relative humidity reaches about 70% in August. Thermal comfort is related to relative humidity that are the essential parameters of the feeling of comfort. Humidity is an important parameter in thermal comfort, it is why we can conclude that we have reached a relatively good hygrothermal comfort.

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“…The studied house [15] which has an area of 65 m 2 , fig. 1, is built in accordance with Algerian building code [21,22].…”

Section: Scope Of the Researchmentioning

confidence: 99%

“…Based on a validated building thermal model, dynamic analysis is carried out in order to evaluate the impact of thermal mass, eaves, and night ventilation [15]. The results demonstrate that cooling energy demand is more affected by thermal transmittance values than by the envelope thermal mass.…”

Section: Introductionmentioning

confidence: 99%

Hygrothermal study of dwelling submitted to passive cooling

Kharchi

Imessad

2018

THERM SCI

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“…However, Trombe wall systems are not popular for high-rise residential buildings because of the extra weight of the structure, the possible overheating under hot summer conditions and aesthetical concerns. Dynamic simulations by TRNSYS, calibrated with experimental data were also used to investigate different types of wall construction for a passive designed house under a Mediterranean climate [58]. The research also revealed that thermal transmittance values exert more influence over cooling energy demand than envelope thermal mass.…”

Section: Opaque Envelope -Wall and Roofmentioning

confidence: 99%

“…5. There are also suggestions that the optimum overhang length for a south facing windows can be expressed as the ratio of projection length/ over window height [58]. Fixed solar shading is able to cut down peak cooling load, at the expense of daylight access and heat harvesting in winter.…”

Section: Solar Shadingmentioning

confidence: 99%

A comprehensive review on passive design approaches in green building rating tools

Chen

Yang

2015

Renewable and Sustainable Energy Reviews

239

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“…A calibration process was developed in order to incorporate the effect of natural ventilation, whose presence in this particular type of residence does not only have an environmental meaning but also a cultural one, as it is a widespread method of environmental control in collective housing stock in the Mediterranean area (33).…”

Section: Energy Model Generationmentioning

confidence: 99%