SYSTEMES DE CHAUFFAGE SIMPLES AVEC RECUPERATION DES EAUX GEOTHERMALES REFROIDIES POUR L'IRRIGATION

H. Verlodt, A. Hadj-Ali
The geothermal heating systems in Tunisia are mostly utized for cooling geothermal water drilled for irrigation purposes.

This system needs low delivery rates and low speed and utilizes different plastic tubes, depending on pressure and water temperature. The heating tubes are posed on the ground surface in order to heat both soil and air. The capacity of the heating system is calculated for gliding night temperatures, which allows low capacity and cheap installation.

Simple temperature regulation with selection of 3 capacities and based on two different heat exchangers is proposed. This exchangers can be used individually or in combination.

During the warm period the necessary water for irrigation is cooled in simple outdoor coolers of corrugated polypropylene tubes.

The cooled water for irrigation purposes on the farm is collected in an elevated water bassin, which allows to maintain enough pressure (0.1–0.2 bar) to use a simple localized irrigation system with Irrigaine seephoses and a simple hydraulic fertilizer dilution-injection system.

Excess of cooled water is returned to the normal perimeter or to other growers needing irrigation water.

Verlodt, H. and Hadj-Ali, A. (1990). SYSTEMES DE CHAUFFAGE SIMPLES AVEC RECUPERATION DES EAUX GEOTHERMALES REFROIDIES POUR L'IRRIGATION. Acta Hortic. 263, 205-212
DOI: 10.17660/ActaHortic.1990.263.20
https://doi.org/10.17660/ActaHortic.1990.263.20

Acta Horticulturae