skip to main content

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

A new generation of full variable-capacity air-conditioning (A/C) and heat pump units has come on the market that promises to deliver very high cooling and heating efficiency. The units are controlled differently than standard single-capacity (fixed-capacity) systems. Instead of cycling on at full capacity and cycling off when the thermostat is satisfied, the new units can vary their capacity over a wide range (approximately 40%–118% of nominal full capacity) and stay on for 60%–100% more hours per day than the fixed-capacity systems depending on load-to-capacity ratios. Two-stage systems were not evaluated in this research effort.
Authors:
 [1] ;  [1] ;  [1]
  1. Building America Partnership for Improved Residential Construction, Cocoa, FL (United States)
Publication Date:
OSTI Identifier:
1215272
Report Number(s):
NREL/SR--5500-64274; DOE/GO--102015-4678
DOE Contract Number:
AC36-08GO28308
Resource Type:
Technical Report
Resource Relation:
Related Information: Work performed by Building America Partnership for Improved Residential Construction, Cocoa, Florida.
Research Org:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Contributing Orgs:
Building America Partnership for Improved Residential Construction, Cocoa, FL (United States)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION 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