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Universitaet fuer Bodenkultur Wien (1999)

Development of a solar cooling system for rural agricultural applications

Umar, B.

Titre : Development of a solar cooling system for rural agricultural applications

Auteur : Umar, B.

Akad. Grad : Thesis.Doctoral 1999

Université de soutenance : Institut fuer Landtechnik und Energiewirtschaft ; Universitaet fuer Bodenkultur Wien

Résumé
The population of developing countries is increasing and the major concern in these countries is how to achieve a pro rata increase in food production. Efforts to realize this task are being hampered by unacceptably high post-harvest losses of production, especially those that are highly perishable - such as tubers, fruits and vegetables. Conventional cooling facilities needed to handle these foodstuffs are lacking or not reliable. Deterioration is fast and serious losses are incurred. However, most of these countries have tropical climates characterized by high levels of solar energy, which can be harnessed for cooling. Solar cooling systems are still being developed, but preliminary works have shown positive results. In general, the system is technically simple to construct, operate and maintain, relatively cheap to run and can consist of substances that are environmentally benign. Some of the substances being tried in adsorption systems are silica gel as adsorbent and water as adsorbate (refrigerant). This work investigated the possibility of using this pair in intermittent solar-powered adsorption cooling. Satisfactory laboratory results were obtained, which include cooling temperatures of 8° - 13°C and effective coefficients of performance (COP) of 0.29-0.37. Based on the laboratory results, a small- scale solar cooling field model to be powered by a 1 m"2-flat plate collector has been designed for agricultural storage in rural areas. The model employs silica gel (4 kg) and water (1 kg) as the working substances, with the design desorption and cooling temperatures being 90° and 8°C respectively. The system has an effective COP of 0.32 and a daily cooling output of 2144 kJ, which could cool 22 kg of a typical tropical foodstuff from an ambient temperature of 35°C to around 8°C.

Mots clé : Solarkuehlung / Solaradsorptionskuehlung / Adsorption / Kieselgel / tropische Laender / Landwirtschaft — solar cooling / adsorption / silica gel / tropical countries / agriculture / food cooling facility / food preservation / rural areas

Présentation : Österreichische Dissertationsdatenbank

Page publiée le 11 juin 2008, mise à jour le 13 mars 2019