New passive thermal comfort system using three renewable energies: Wind catcher, solar chimney and earth to air heat exchanger integrated to real‐scale test room in arid region (Experimental study)

2020 ◽  
Author(s):  
Nasreddine Sakhri ◽  
Abdeljabar Moussaoui ◽  
Younes Menni ◽  
Milad Sadeghzadeh ◽  
Mohammad Hosein Ahmadi
Keyword(s):  
Experimental Study ◽  
Heat Exchanger ◽  
Thermal Comfort ◽  
Arid Region ◽  
Renewable Energies ◽  
Solar Chimney ◽  
Test Room ◽  
Scale Test ◽  
Real Scale

Experimental Study of Thermal and Hygrometric Behavior of Earth to Air Heat Exchanger with Two Working Regimes in Arid Region

2020 ◽  
pp. 53-59
Author(s):  
Nasreddine Sakhri ◽  
Belkacem Draoui ◽  
Younes Menni ◽  
Ebrahim Elkhali Lairedj ◽  
Soufiane Merabti ◽  
...  
Keyword(s):  
Experimental Study ◽  
Heat Exchanger ◽  
Arid Region

scholarly journals Testing the performance of a solar energy cooling system in Baghdad city

2021 ◽  
Vol 30 (2) ◽  
pp. 283-292
Author(s):  
Muna Ahmed ◽  
Ali Al-Salihi ◽  
Hazim Hussain
Keyword(s):  
Renewable Energy ◽  
Heat Exchanger ◽  
Cooling System ◽  
Ambient Air ◽  
The Other ◽  
Water Tank ◽  
Cooling Efficiency ◽  
Solar Chimney ◽  
Test Room ◽  
Study Results

Renewable energy resources have become a promissory alternative to overcome the problems related to atmospheric pollution and limited sources of fossil fuel energy. The technologies in the field of renewable energy are used also to improve the ventilation and cooling in buildings by using the solar chimney and heat exchanger. This study addresses the design, construction and testing of a cooling system by using the above two techniques. The aim was to study the effects of weather conditions on the efficiency of this system which was installed in Baghdad for April and May 2020. The common weather in these months is hot in Baghdad. The test room of the design which has a size of 1 m3 was situated to face the geographical south. The test room is thermally insulated and connected to a solar chimney which generates a convection current to draw the air out of the room through a heat exchanger. The heat exchanger was submerged in a water tank of 2 m length, 1 m width and 1 m height. It was also covered with a layer of soil mixture with a thickness of 10 cm. The experiment simulates the natural conditions of a shallow water surface, connected to the room from the other side. The study results revealed that the air temperature inside the test room was lower than that of the ambient air outside. Pearson correlation coefficient showed that there was a strong direct relationship between solar radiation, temperature and wind speed from one side and the cooling efficiency from the other side. Also, there was a negative correlation between relative humidity and cooling efficiency.

scholarly journals Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1893
Author(s):  
Kwonye Kim ◽  
Jaemin Kim ◽  
Yujin Nam ◽  
Euyjoon Lee ◽  
Eunchul Kang ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Pump System ◽  
Heat Pump System ◽  
Scale Experiment ◽  
Real Scale

A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

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