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Title: Simplified Space Conditioning in Low-Load Homes: Results from the Fresno, California, Retrofit Unoccupied Test House

In this study, the Building America team, IBACOS, sought to determine cost-effective, energy-efficient solutions for heating and cooling houses. To this end, the team performed field testing in a retrofit unoccupied test house in Fresno, California, to evaluate three air-based heating, ventilation, and air conditioning (HVAC) distribution systems during heating, cooling, and midseason conditions. These included a typical airflow ducted system to the bedrooms, a low airflow ducted system to the bedrooms, and a system with no ductwork to the bedrooms. The relative ability of each of the three systems was assessed with respect to relevant Air Conditioning Contractors of America (ACCA) and ASHRAE standards for house temperature uniformity and stability, respectively. Computational fluid dynamics modeling also was performed and refined based on comparison to field test results to determine the air flow rate into the bedrooms of over-door and bottom-of-door air transfer grilles.
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  1. IBACOS, Inc., Pittsburgh, PA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Resource Type:
Technical Report
Research Org:
IBACOS, Inc., Pittsburgh, PA (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Country of Publication:
United States
residential; Residential Buildings; IBACOS; Building America; field test results; computational fluid dynamics; CFD; room-to-room uniformity; mini-split; single point; HVAC; Fresno, California; retrofit unoccupied test house; model validation; ACCA Manual RS; ASHRAE Standard 55; occupant comfort; space conditioning; 50% Building America Benchmark; hot mixed-dry; low airflow