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Mesures de l'impact du niveau d'humidité de l'air ambiant sur la performance en matière de dégivrage et la consommation d'énergie des systèmes frigorifiques dans les supermarchés.

Measured impacts of supermarket humidity level on defrost performance and refrigerating system energy use.

Auteurs : HENDERSON H. I., KHATTAR M.

Résumé

The paper presents field-monitored data from two supermarkets (A and B) where the impact of space humidity on refrigerating system energy use was evaluated. The results at store B showed that refrigerating system energy use decreases by nearly 10 kWh/day for each 1% drop in space relative humidity, or about 0.4% of average annual system energy use. At store A, the measured data show that implementing temperature-terminated defrost reduced refrigerating system energy use by nearly 70 kWh/day over the winter period when the average space humidity was 22% relative humidity. The savings from temperature-terminated defrost increase by 4 kWh/day per each 1% drop in relative humidity. At both stores, the same type of mechanical controls were used to duty cycle the anti-sweat heaters based on store dew point. Anti-sweat heater electricity use was observed to decrease by 4.6 kWh/day at store B and 3.4 kWh/day at store A for each 1% drop in relative humidity. The overall energy reduction factor at the two stores was 12 kWh/day per % relative humidity at store A and 15 kWh/day per % relative humidity at store B. With more aggressive anti-sweat heater control, reduction factors as high as 20 kWh/day per % relative humidity appear to be possible.

Détails

  • Titre original : Measured impacts of supermarket humidity level on defrost performance and refrigerating system energy use.
  • Identifiant de la fiche : 2000-1865
  • Langues : Anglais
  • Source : ASHRAE Transactions. 1999 Winter Meeting, Chicago, Illinois + CD-ROM.
  • Date d'édition : 1999
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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