Final Report: Cooling Seasonal Energy and Peak Demand Impacts of Improved Duct Insulation on Fixed-Capacity (SEER 13) and Variable-Capacity (SEER 22) Heat Pumps

C. Withers  Cummings, J.¹  Florida Solar Energy Center, Cocoa, FL (United States)]  Nigusse, B.¹  Florida Solar Energy Center, Cocoa, FL (United States)] 

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

关键词: residential;    Residential Buildings;    BA-PIRC;    Building America;    variable capacity heat pump;    duct insulation;    seasonal cooling energy;    peak demand;    space conditioning;   

DOI  :  10.2172/1325407
RP-ID  :  DOE/GO--102016-4720
PID  :  OSTI ID: 1325407
Others  :  Other: 7468

学科分类：能源（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

A new generation of full variable-capacity, central, ducted air-conditioning (AC) and heat pump units has come on the market, and they promise to deliver increased cooling (and heating) efficiency. They are controlled differently than standard single-capacity (fixed-capacity) systems. Instead of cycling on at full capacity and then cycling off when the thermostat is satisfied, they can vary their capacity over a wide range (approximately 40% to 118% of nominal full capacity), thus staying ???on??? for up to twice as many hours per day compared to fixed-capacity systems of the same nominal capacity. The heating and cooling capacity is varied by adjusting the indoor fan air flow rate, compressor, and refrigerant flow rate as well as the outdoor unit fan air flow rate. Note that two-stage AC or heat pump systems were not evaluated in this research effort. The term dwell is used to refer to the amount of time distributed air spends inside ductwork during space-conditioning cycles. Longer run times mean greater dwell time and therefore greater exposure to conductive gains and losses.