Distribution and Room Air Mixing Risks to Retrofitted Homes

Burdick, A.¹ 

[1] IBACOS, Inc., Pittsburgh, PA (United States)

关键词: residential;    Residential Buildings;    IBACOS;    Building America;    air distribution;    stratification;    throw;    spread;    cooling;    pressure;    leakage;    register sizing;    HVAC;   

DOI  :  10.2172/1220399
RP-ID  :  DOE/GO--102014-4544
PID  :  OSTI ID: 1220399
Others  :  Other: 6999

学科分类：能源（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Energy efficiency upgrades reduce heating and cooling loads on a house. With enough load reduction and if the HVAC system warrants replacement, the HVAC system is often upgraded with a more efficient, lower capacity system that meets the loads of the upgraded house. For a single-story house with ceiling supply air diffusers, ducts are often removed and upgraded. For houses with ducts that are embedded in walls, the cost of demolition precludes the replacement of ducts. The challenge with the use of existing ducts is that the reduced airflow creates a decreased throw at the supply registers, and the supply air and room air do not mix well, leading to potential thermal comfort complaints. This project investigates this retrofit scenario. The issues and solutions discussed here are relevant to all climate zones, with emphasis on climates that require cooling.