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Évaluation de l'impact du dispositif de mesure sur le coefficient de dégradation cyclique des systèmes de conditionnement d’air.

Evaluating the impact of the measurement setup on cyclic degradation coefficient of air conditioning systems.

Numéro : pap. 2544

Auteurs : DHUMANE R., QIU T., LING J., et al.

Résumé

Building Heating, Ventilation and Air Conditioning (HVAC) is one of the largest primary energy consumers in the United States. Vapor Compression Systems (VCS), which are at the heart of building HVAC, are typically sized for peak operation, but operate at part load most of the time. The current rating standards are conceived to provide credit to designs that have higher efficiency in the part load operation. However, the current evaluation procedure is not sufficiently standardized; the same system could be tested in different test facilities and yield different performance results. These deviations arise from such factors including, but not limited to, test setup (called code tester) thermal inertia, length and orientation of suction line and vapor line that affects refrigerant migration during off cycle, and frequency of operation of dampers to regulate airflow in code testers. These are not captured in the current procedure. The current article aims at quantification of the thermal inertia effects of the code tester and its impact on the evaluation of cyclic degradation coefficient (Cd) in a split air conditioning system. A new term called “thermal inertia factor” (TIF) is added to the formulation of the Cd to account for the code tester thermal inertia. A conventional residential split air conditioning system is tested in two different code testers to obtain two different values of the Cd. A physically based model of code tester is developed using Modelica and validated with experimental data. TIF’s for both code testers are evaluated using this model. The new equation is able to predict the Cd obtained in the second setup from the first setup experimental results and the TIF of the second experimental setup. The current study is the first of its kind and is expected to improve existing test procedures by removing variations arising from differences in code tester designs at various laboratories. Parametric studies on air flow rates and code tester system temperatures are carried out to quantify the TIF and understand the effect of various factors on it.

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 : Evaluating the impact of the measurement setup on cyclic degradation coefficient of air conditioning systems.
  • Identifiant de la fiche : 30024641
  • Langues : Anglais
  • Source : 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 09/07/2018

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