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Search Publications by: William M. Healy (Fed)

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Displaying 26 - 50 of 55

Power Supply Issues for Wireless Sensor Networks: A Review

March 1, 2014
Author(s)
Wenqi Guo, William M. Healy, Mengchu Zhou
Wireless sensor networks (WSNs) have enabled numerous embedded wireless applications in different areas such as military/battlefield, environmental monitoring, and intelligent building systems. They consist of a large number of nodes that need to operate

Experimental Study of the Thermal Impacts on Wireless Sensor Batteries

April 10, 2013
Author(s)
Wenqi Guo, William M. Healy, Mengchu Zhou
Wireless sensor networks are being considered for application within buildings to control various equipment in different working environments. As wireless sensors are powered by commercially available batteries, battery performance will directly affect the

Battery Discharge Characteristics of Wireless Sensors in Building Applications

April 11, 2012
Author(s)
Wenqi Guo, William M. Healy, Mengchu Zhou
Sensor nodes in wireless networks often use batteries as their source of energy, but replacing or recharging exhausted batteries in a deployed network can be difficult and costly. Therefore, prolonging battery life becomes a principal objective in the

ZigBee-Wireless Mesh Networks for Building Automation and Control

April 12, 2010
Author(s)
Wenqi Guo, William M. Healy, Mengchu Zhou
ZigBee is a wireless technology developed as an open global standard to address the unique needs of low-cost low-power wireless sensor networks. This standard takes full advantages of the IEEE 802.15.4 physical radio specification and operates in

Wireless Sensor Network Performance Metrics for Building Applications

April 1, 2010
Author(s)
Won Suk Jang, William M. Healy
Metrics are investigated to help assess the performance of wireless sensors in buildings. Wireless sensor networks present tremendous opportunities for energy savings and improvement in occupant comfort in buildings by making data about conditions and

Measurement Science Roadmap for Net-Zero Energy Buildings

March 18, 2010
Author(s)
Joan Pellegrino, Arthur H. Fanney, Andrew K. Persily, Piotr A. Domanski, William M. Healy, Steven T. Bushby
Buildings account for nearly a third of the world s energy use today, and this share is expected to rise along with population growth and levels of prosperity. In the United States, residential and commercial buildings consume about 40% of primary energy

Measurement Challenges in Achieving Energy Monitoring Systems in Buildings

March 3, 2010
Author(s)
William M. Healy
The benefits of energy conserving approaches in buildings are often not apparent to building occupants because of the insufficient feedback provided regarding energy consumption. A review of the literature suggests that energy feedback devices can provide

Practical Challenges in Wireless Sensor Network Use in Buildings

September 30, 2008
Author(s)
William M. Healy, Won Suk Jang
While wireless sensor network technology has advanced in recent years, potential users of these systems in buildings still have concerns with their use. This report summarizes results of a literature survey and interactions with building industry

Remotely Accessed Photovoltaic Power Experiment

March 21, 2006
Author(s)
W J. Hutzel, William M. Healy
A solar energy experiment that estimates the number of photovoltaic panels needed to provide supplemental power for a typical residence is described. The project is unique because it uses freely available on-line resources for collecting and analyzing

Lessons Learned in Wireless Monitoring

October 2, 2005
Author(s)
William M. Healy
The emergence of wireless communications technology has led to an increasing interest in sensors that are free from wiring constraints that increase the cost of installation of a sensor network and create a confusing collection of wires in a building. In

High-Temperature Guarded Hot Plate Apparatus Control of Edge Heat Loss

June 1, 2005
Author(s)
Daniel R. Flynn, William M. Healy, Robert R. Zarr
The guarded hot plate (GHP) apparatus is the most common type of absolute apparatus for measurement of the thermal transmission properties of thermal insulation. As the name implies, the hot meter plate is surrounded by a coplanar guard plate, separated by

High-Temperature Guarded Hot Plate Apparatus Optimal Locations of Circular Heaters

June 1, 2005
Author(s)
Daniel R. Flynn, William M. Healy, Robert R. Zarr
The National Bureau of Standards (now the National Institute of Standards and Technology (NIST)) pioneered the use of circular line-heat-sources in guarded hot plate (GHP) apparatus, the most common type of absolute apparatus for measurement of the thermal

Development of an Optical Fiber-Based Moisture Sensor for Building Envelopes

October 1, 2003
Author(s)
William M. Healy, S Luo, M Evans, A Sucheta, Y Liu
Optical fiber-based moisture sensors have been developed to help detect moisture problems in building envelopes. The sensors are created with a coating on a long period grating that is written onto optical fiber. As the coating absorbs moisture from its