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Réduction de la consommation d’énergie des systèmes de conditionnement d’air grâce au pré-refroidissement évaporatif direct de l’air du condenseur.

Reduction of energy consumption in air-conditioning systems employing direct evaporative pre-cooling of condenser air.

Numéro : pap. 2606

Auteurs : NDUKAIFE T. A., AGWU NNANNA A. G.

Résumé

This paper presents an experimental investigation of the application of direct evaporative cooling to reduce energy consumption in a residential sized split Air-Conditioning system. Direct evaporative cooling is employed at the air-cooled condenser of a split air-conditioning system to pre-cool the ambient air flowing over the condenser coils. Different ambient conditions of air were simulated using a heater to mimic typical high temperature environments. Rigid cellulose pads with thickness ranging from 2-6 inches (5.1cm-15.24cm) served as the heat exchange medium for air-water interaction, and were tested to determine the influence of the pad thickness in pre-cooling the ambient air before it flows over the condenser coils to extract heat from the refrigerant in the condenser. It was observed that a 1°C drop in ambient air temperature causes the condensing temperature of the refrigerant to drop by 0.6°C. This drop in condensing temperature of the refrigerant causes a decrease in power consumption of the unit, accompanied by an increase in Coefficient of Performance (COP). Results obtained shows that up to 44% increase in COP, and a 20% decrease in power consumption can be achieved by employing evaporative cooling. Additionally, the COP was found to increase by 4% for every 1°C drop in refrigerant condensing temperature. The water consumption pattern of the hybrid system is monitored to provide a realistic estimate of the operating cost, and profitability of the hybrid system. It was observed that 0.34liters of water is consumed for every percent increase in COP. To provide a realistic estimate of the daily water consumption of the hybrid system, the operation time was increased from 1-4hours, in step increments of 1hour. The volume of water consumed was found to increase by a factor of 1.8, 2.5, and 3.2, for 2hrs, 3hrs and 4hrs of operation respectively. This shows that as the operating hours of the hybrid system in a day increases, the volume of water consumed will decrease.

Documents disponibles

Format PDF

Pages : 10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Reduction of energy consumption in air-conditioning systems employing direct evaporative pre-cooling of condenser air.
  • Identifiant de la fiche : 30018965
  • Langues : Anglais
  • Source : 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 11/07/2016

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