Air velocity effect on the performance of geothermal helicoidally water-air heat exchanger under El Oued climate, Algeria. (1st December 2020)

• Record Type: Journal Article
• Authors: Hadjadj, Abdessamia; Benhaoua, Boubaker; Atia, Abdelmalek; Khechekhouche, Abderrahmane; Lebbihiat, Nacer; Rouag, Amar
• Is Part Of: Thermal science and engineering progress. Volume 20(2020)
• Publication Date: 2020-12-01
• Subjects: Air velocity -- Geothermal energy -- Thermal efficiency -- Water well -- Water–air helical heat exchanger; Heat engineering -- Periodicals; Heat engineering; Thermodynamics; Periodicals; 621.402
• DOI: 10.1016/j.tsep.2020.100548
• Languages: English
• ISSNs: 2451-9049

Abstract

Abstract: This paper investigates experimentally the effect of air velocity on the performance of a water–air helical heat exchanger (HWAHE) in the region of El-Oued, located in the southeast of Algeria. The HWAHE made of PVC piping with 30 m of length and 0.06 m of diameter was immersed into the bottom of a water well at 5 m depth. In addition, a theoretical model was developed to determine the evolution of the air temperature inside the HWAHE as function of the main operating parameters. Results showed that the maximum heat exchange reached nearly 418 W at 10 m/s of air velocity while the maximum of temperature gap between the inlet and the outlet air was 14.1 °C. The HWAHE efficiency decreased with the increase of the air velocity. The efficiency of heat exchanger was obtained to be 82%, 81% and 80% for the average velocity value of 10, 15 and 20 m/s, respectively. According to the obtained results, the HWAHE presented in this paper may be used for cooling and heating of buildings or greenhouses in the southeastern Algeria.