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Accueil du site → Doctorat → États-Unis → 1994 → Thermal performance of an integrated double-envelope building model for hot arid climates

University of Michigan (1994)

Thermal performance of an integrated double-envelope building model for hot arid climates

Afifi, Emad Mahmoud

Titre : Thermal performance of an integrated double-envelope building model for hot arid climates

Auteur : Afifi, Emad Mahmoud

Université de soutenance : University of Michigan

Grade : Dissertation (Arch.D.) 1994

This dissertation introduces a new conceptual building model integrating passive and mechanical environmental control systems. The general building configuration includes a direct/indirect evaporative cooling system, a central atrium, individual zone HVAC units, a double envelope system, and a heat recovery system. Outside air is distributed through the building in a uniform pattern to enhancenight-time ventilation, economizer cooling, and indoor air quality. The model provides a solution to problems of space overheating and excessive energy consumption in commercial buildings in hot arid regions. The research goal is to evaluate the thermal performance of the model. The Building Loads Analysis and System Thermodynamics program (BLAST) is used to simulate and compare three double-envelope variations of the proposed model with two variations of a single-envelope model. A typical meteorological year for Phoenix, Arizona is used to represent a hot arid climate, where cooling loads are expected to dominate heating loads. Annual cooling budgets and peak cooling loads are compared for the five models. Month-by-month cooling and heating energy budgets are also obtained separately for the north, east,south, west, and atrium zones. Hour-by-hour simulations for the Phoenix summer and winter design days are performed and results analyzed and presented. Temperature profiles in the double envelope cavities are plotted and compared.
BLAST simulation results indicate that the double envelope building model performs significantly better than the single envelope building model. Flexible control strategies applied to the double envelope model can further reduce both its peak cooling loads and its cooling energy budgets. Orientation of a square-plan double envelope model has no significant effect on its total energy budget or total peak loads but does redistribute individual zone loads. Annual simulation of the double envelope base model shows a 26% reduction in total cooling energy budget compared to the single envelope base model, and flexible control produces an additional 18% reduction. Design day simulations show a 26% reduction in total peak cooling loads. The integrated model design, as investigated, shows considerable energy-saving potential for hot arid climates. The methodology can be extended to encompass additional features and other climatic conditions.


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