Documentation of Calculation Methodology, Input data, and Infrastructure for the Home Energy Saver Web Site

Abstract

The Home Energy Saver (HES, http://HomeEnergySaver.lbl.gov) is an interactive web site designed to help residential consumers make decisions about energy use in their homes. This report describes the underlying methods and data for estimating energy consumption. Using engineering models, the site estimates energy consumption for six major categories (end uses); heating, cooling, water heating, major appliances, lighting, and miscellaneous equipment. The approach taken by the Home Energy Saver is to provide users with initial results based on a minimum of user input, allowing progressively greater control in specifying the characteristics of the house and energy consuming appliances. Outputs include energy consumption (by fuel and end use), energy-related emissions (carbon dioxide), energy bills (total and by fuel and end use), and energy saving recommendations. Real-world electricity tariffs are used for many locations, making the bill estimates even more accurate. Where information about the house is not available from the user, default values are used based on end-use surveys and engineering studies. An extensive body of qualitative decision-support information augments the analytical results.iii AcknowledgementsThis project has been many years in the making, and has benefited from the expertise of many people. The tasks have ranged from creating the models and gathering the data documented in this report to building and maintaining the user interface and underlying code base.

Development of Standardized Domestic Hot Water Event Schedules for Residential Buildings

“…Baths and showers were treated as one end-use until 2007, when they were split as part of this project because of their very different hourly profiles. Average daily volume for each end-use was established based on a survey of recent hot water studies and other authoritative references [4,[17][18][19][20][21][22]. These Benchmark daily hot water volumes are summarized in Table 2.…”