Browsing by Author "Nacer Lebbihiat"

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Experimental and numerical analysis of helical geothermal heat exchanger operating in hot climates
(university Of Eloued جامعة الوادي, 2020-02-23) Nacer Lebbihiat; Abdelmalek Atia; Noureddine Meneceur
With the onset of the warm and cold season, the temperature inside the building goes far away from the human comfort condition, the geothermal heat exchanger systems can be used to refresh the buildings. various configurations especially single U-tube ground heat exchangers have been studied to improve the thermal performance of ground heat exchangers. Although helical type has better thermal performance than the others. The present paper provides experimental and numerical analysis of helical geothermal heat exchanger tested in El-Oued region (Algeria). A PVC pipe was used as a Helicoidally Water-Air Heat Exchanger (HWAHE), with 30 m of length and 0.6 m of diameter. The HWAHE was emerged in the bottom of water well of 5 m of depth. A mathematical model was developed to test thermal efficiency of the system and a parametric analysis was carried out taking into account the length and the radius of the pipe and the velocity of the air in the pipe. The results of performance show that the inlet air temperature has significant effect mainly when the difference in temperature between the ambient air and the water borehole increases. Therefore, the gained temperature gap between the inlet and the outlet air of the exchanger increases with the increasing of air inlet temperature. However, at air velocity of 10 m/s the efficiency of the exchanger reached 89%.
Experimental and numerical analysis of helical geothermal heat exchanger operating in hot climates
(university Of Eloued جامعة الوادي, 2020-02-23) Nacer Lebbihiat; Abdelmalek Atia; Noureddine Meneceur
With the onset of the warm and cold season, the temperature inside the building goes far away from the human comfort condition, the geothermal heat exchanger systems can be used to refresh the buildings. various configurations especially single U-tube ground heat exchangers have been studied to improve the thermal performance of ground heat exchangers. Although helical type has better thermal performance than the others. The present paper provides experimental and numerical analysis of helical geothermal heat exchanger tested in El-Oued region (Algeria). A PVC pipe was used as a Helicoidally Water-Air Heat Exchanger (HWAHE), with 30 m of length and 0.6 m of diameter. The HWAHE was emerged in the bottom of water well of 5 m of depth. A mathematical model was developed to test thermal efficiency of the system and a parametric analysis was carried out taking into account the length and the radius of the pipe and the velocity of the air in the pipe. The results of performance show that the inlet air temperature has significant effect mainly when the difference in temperature between the ambient air and the water borehole increases. Therefore, the gained temperature gap between the inlet and the outlet air of the exchanger increases with the increasing of air inlet temperature. However, at air velocity of 10 m/s the efficiency of the exchanger reached 89%.
Geothermal energy development and future possible applications in Algeria
(University of Eloued, 2019-02-24) Nacer Lebbihiat; Abdelmalek Attia; Abdessamia hadjadj
The main objective of the present study is to review the development of geothermal energy utilization in Algeria, giving its historical development and opportunities. Geothermal energy is used for direct utilization in Algeria, which is among the main countries in Africa in geothermal direct use applications. The inventory of thermal springs has been updated with more than 240 springs identified. The highest temperatures recorded were 98 °C in Hammam El Maskhoutin (Guelma) and 118 °C in Biskra, in the western part of the country. In the south, the thermal springs have a mean temperature of 50 °C. The northeastern zone of the country, covering an area of 15,000 km2, remains potentially the most interesting geothermal area, with the Barda spring giving 100 L/s. Geothermal energy is a relatively benign energy source, displaying fossil fuels and thus reducing greenhouse gas emissions. So it is expected that geothermal energy development will significantly speed up in the country if the geothermal law becomes effective
Geothermal energy development and future possible applications in Algeria
(University of Eloued, 2019-02-24) Nacer Lebbihiat; Abdelmalek Attia; Abdessamia hadjadj
The main objective of the present study is to review the development of geothermal energy utilization in Algeria, giving its historical development and opportunities. Geothermal energy is used for direct utilization in Algeria, which is among the main countries in Africa in geothermal direct use applications. The inventory of thermal springs has been updated with more than 240 springs identified. The highest temperatures recorded were 98 °C in Hammam El Maskhoutin (Guelma) and 118 °C in Biskra, in the western part of the country. In the south, the thermal springs have a mean temperature of 50 °C. The northeastern zone of the country, covering an area of 15,000 km2, remains potentially the most interesting geothermal area, with the Barda spring giving 100 L/s. Geothermal energy is a relatively benign energy source, displaying fossil fuels and thus reducing greenhouse gas emissions. So it is expected that geothermal energy development will significantly speed up in the country if the geothermal law becomes effective