Cooling and Heating Season Impacts of Right-Sizing of Fixed- and Variable-Capacity Heat Pumps With Attic and Indoor Ductwork

Cummings, James¹  Withers, Charles¹  Kono, Jamie¹ 

[1] Building America Partnership for Improved Residential Construction, Cocoa, FL (United States)

关键词: residential;    Residential Buildings;    BA-PIRC;    Building America;    HVAC Sizing;    variable capacity heat pump;    indoor ductwork;    iQ drive;    over-sized systems;    seasonal energy savings;    peak demand energy savings;   

DOI  :  10.2172/1220509
RP-ID  :  DOE/GO--102015-4678
PID  :  OSTI ID: 1220509
Others  :  Other: 7124

美国|英语

来源: SciTech Connect

【 摘 要 】

A new generation of central, ducted variable-capacity heat pump systems has come on the market, promising very high cooling and heating efficiency. They are controlled differently than standard fixed-capacity systems. Instead of cycling on at full capacity and then cycling off when the thermostat is satisfied, they vary their cooling and heating output over a wide range (approximately 40% - 118% of nominal full capacity), thus staying 'on' for 60% - 100% more hours per day compared to fixed -capacity systems. Experiments in this research examined the performance of 2-ton and 3-ton fixed- and variable-capacity systems and the impacts of system oversizing.