Performance Monitoring of Residential Hot Water Distribution Systems

Performance Monitoring of Residential Hot Water Distribution Systems

TitlePerformance Monitoring of Residential Hot Water Distribution Systems
Publication TypeConference Paper
Year of Publication2014
AuthorsAnna Liao, Steven Lanzisera, James D Lutz, Christian Fitting, Margarita Kloss, Christopher Stiles
Conference Name2014 ACEEE Summer Study on Energy Efficiency in Buildings
Date Published08/2014
Conference LocationPacific Grove, California
Abstract

Current water distribution systems are designed such that users need to run the water for some time to achieve the desired temperature, wasting energy and water in the process. We developed a wireless sensor network for large-scale, long time-series monitoring of residential water end use. Our system consists of flow meters connected to wireless motes transmitting data to a central "manager" mote, which in turn posts data to our server via the internet. This project also demonstrates a reliable and flexible data collection system that could be configured for various other forms of end use metering in buildings. The purpose of this study was to determine water and energy use and waste in hot water distribution systems in California residences. We installed meters at every end use point and the water heater in 20 homes and collected 1s flow and temperature data over an 8 month period. For a typical shower and dishwasher events, approximately half the energy is wasted. This relatively low efficiency highlights the importance of further examining the energy and water waste in hot water distribution systems.

LBNL Report Number

LBNL-6946E

Refereed DesignationUnknown