Annual cycle energy system (ACES). Performance report, November 1977-September 1978

Technical Report · Thu May 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/5272785· OSTI ID:5272785

Holman, A. S.; Abbatiello, L. A.

A single-family residence near Knoxville, Tennessee, is being used to demonstrate the energy-conserving features of the annual cycle energy system (ACES), an integrated heating and cooling system that utilizes a unidirectional heat pump and low-temperature thermal storage. A second house, the control house, is being used to compare the performance of the ACES with that of an electric-resistance heating and hot-water system combined with a central air conditioning system. The results of one year's operation, from November 1977 through mid-September 1978, showed that the ACES consumed 9012 kWhr of electricity and delivered 40.8 x 10/sup 6/ Btu (43.03 x 10/sup 9/J) of heating, 19.8 x 10/sup 6/ Btu (20.89 x 10/sup 9/J) of hot water, and 24.8 x 10/sup 6/ Btu (26.17 x 10/sup 9/J) of cooling; the annual coefficient of performance (COP) was 2.78. The control house consumed 20,523 kWhr of electricity and delivered 41.3 x 10/sup 6/ Btu (43.57 x 10/sup 9/J) of heating, 14.8 x 10/sup 6/ Btu (15.61 x 10/sup 9/J) of hot water, and 23.2 x 10/sup 6/ Btu (24.41 x 10/sup 9/J) of cooling; the annual COP was 1.13. These loads were delivered in a test year in which the heating season was one of the most severe in the past 20 years and the cooling season was normal. In addition, the ACES reduced peak utility system demands significantly: a reduction from 11.7 to 3.1 kW was achieved in the winter and from 4.1 to 0.7 kW in the summer. The only problems encountered were a heat leak into the storage bin that was twice the calculated value and control logic errors that produced excessive hot water in the winter, requiring extensive use of the night heat-rejection mode in the summer. These problems are currently being corrected.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5272785
• Report Number(s): ORNL/CON-42
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320101* -- Energy Conservation
Consumption
& Utilization-- Residential Buildings-- (-1987)
ANNUAL CYCLE ENERGY SYSTEM
APPLIANCES
BUILDINGS
COEFFICIENT OF PERFORMANCE
COOLING SYSTEMS
DATA
EXPERIMENTAL DATA
GAS APPLIANCES
HEATERS
HEATING
HOUSES
INFORMATION
NORTH AMERICA
NUMERICAL DATA
PERFORMANCE
PERFORMANCE TESTING
RESEARCH PROGRAMS
RESIDENTIAL BUILDINGS
SOUTHEAST REGION
SPACE HEATING
TENNESSEE
TESTING
USA
WATER HEATERS