moisture content, adjusts energy use for hot water and cold water temperatures for the Prototype house that are different from the test values (140°F and 60°F/50°F), and adjusts for the type of controls present (thermostatic control valves, boost heating, cold water only). Both annual average and monthly average hot water uses are calculated in the spreadsheet.
Energy savings for a new range/oven may be credited only if an energy factor has been determined in accordance with the DOE test procedures for cooking appliances (DOE 1997). Annual energy consumption is then estimated as the annual useful cooking energy output as defined in the same test procedure (see Table 26) divided by the energy factor. This calculation is also automated in the BA Analysis Spreadsheet. If the energy factor is unknown for a new range/oven, then it shall be assumed that the Prototype energy use for cooking is the same as the Benchmark.
Table 26. Useful Cooking Energy Output for Gas and Electric Ranges
Electric Cooktop Electric Oven Gas Cooktop Gas Oven
Useful Cooking Energy Output
Modifications to the Benchmark lighting profile and operating hours due to occupancy sensors or other controls may be considered for the Prototype, but negative and/or positive effects on space conditioning load must also be calculated, assuming 100% of interior lighting energy contributes to the internal sensible load.
The lighting calculations necessary for the Prototype are documented in the Lighting Equipment and Usage section of this report.
Internal heat gains associated with all end uses shall be adjusted in proportion to the difference in energy use for the Prototype relative to the Benchmark, and the hourly profile for internal heat gains shall be the same as the corresponding Benchmark hourly profile for energy use.
For the Prototype, all site electricity generation is credited regardless of energy source. Residential-scale photovoltaic systems, wind turbines, fuel cells, and micro-cogeneration systems are all potential sources of electricity generated on the site. An offset must be applied to this electricity credit equal to the amount of purchased energy used in the on-site generation process. The credit for site generation shall be tracked separately from the whole-house energy analysis and reported as a separate line in the summary tables (discussed later in this report).