A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Variability in Energy Factor Test Results for Residential Electric Water Heaters
Recent modifications to the minimum energy efficiency requirements for residential water heaters have spurred an investigation into the variability in testing high-efficiency electric water heaters. While initial interlaboratory comparisons showed excellent agreement between test results from different labs, subsequent interlaboratory comparisons show differences between measured energy factors of up to 0.040. To determine the source of these differences, analyses of various parts of the test procedure are performed. For one case studied, the uncertainty in test results can be as high as +0.028 if instrument accuracies reach the minimum level allowed in the test procedure. Other areas of the test procedure where variability is introduced are the optional use of pre-draws, the location of the lower tank temperature-measuring device, the use of insulation on tank fittings, and the use of a warm-up period before the simulated-use test commences. The implications of these issues on test results are discussed.
Variability in Energy Factor Test Results for Residential Electric Water Heaters
Recent modifications to the minimum energy efficiency requirements for residential water heaters have spurred an investigation into the variability in testing high-efficiency electric water heaters. While initial interlaboratory comparisons showed excellent agreement between test results from different labs, subsequent interlaboratory comparisons show differences between measured energy factors of up to 0.040. To determine the source of these differences, analyses of various parts of the test procedure are performed. For one case studied, the uncertainty in test results can be as high as +0.028 if instrument accuracies reach the minimum level allowed in the test procedure. Other areas of the test procedure where variability is introduced are the optional use of pre-draws, the location of the lower tank temperature-measuring device, the use of insulation on tank fittings, and the use of a warm-up period before the simulated-use test commences. The implications of these issues on test results are discussed.
Variability in Energy Factor Test Results for Residential Electric Water Heaters
Healy, William M. (author) / Lutz, James D. (author) / Lekov, Alex B. (author)
HVAC&R Research ; 9 ; 435-449
2003-10-01
15 pages
Article (Journal)
Electronic Resource
Unknown
Residential water heaters: Energy and cost analysis
| Elsevier | 1977
Cost of Increased Energy Efficiency for Residential Water Heaters
| British Library Conference Proceedings | 2000
Cost of Increased Energy Efficiency for Residential Water Heaters
| British Library Online Contents | 2000
Thermal Performance of Residential Electric Water Heaters Using Alternative Blowing Agents
| British Library Conference Proceedings | 2000
Thermal Performance of Residential Electric Water Heaters Using Alternative Blowing Agents
| British Library Online Contents | 2000