1. Abstract Introduction Assumptions & Limitations Design Objectives Functional Requirements Design Constraints Technical Approach Measurable Milestones End Product Description With increasing power consumption and costs in the home, many homeowners would like to monitor their energy usage. The Household Power Monitoring System (HPMS) will allow the homeowner to monitor the individual and total power used by household devices. With this information, the user can find ways to reduce their power costs. The system will also allow the user to identify devices that are becoming inefficient or those that are likely to break down. General Background: HPMS will record the power consumption of household devices so the user can analyze their usage. Technical Problem: The system will measure, encode, transmit, receive, decode, analyze, and display real and reactive power, voltage, and current as a function of time in a user-friendly manner. Operating Environment: HPMS will operate in any standard, residential setting. Intended Users and Uses: The system is intended for any homeowner interested in tracking their total power consumption and the consumption of individual devices. Assumptions: The user will be able to operate a simple computer interface. The user will have a basic understanding of electricity and the concept of power. The user will be knowledgeable of the local utility rate and billing schedule. Limitations: The system can only operate with a modern, grounded electrical system. The system can only operate with a 60Hz, 120/240V outlet format. The HPMS system will measure the total power consumption. It will have the ability to break it down on a device basis and report it in a useful manner to the homeowner. Monitoring device can be attached to any 120/240V device System’s communications will be reliable Measurements of power will consider voltage irregularities Data will be displayed in an easily understood format The system must be safe for any home environment The system will not interfere with other household devices System complexity Cost Available technology Testing Approach Design completed Prototype completed Testing completed Final product completed The prototype will be a stand-alone system capable of recording total power usage of the home at the breaker box. Individual satellite modules will record the on / off cycles of home devices and communicate the data back to the PC. Total power usage and on / off cycles will be compiled by an obsolete PC that will analyze it and give the user a device by device breakdown of the power used. Data collection components testing Data transmission testing Integration of components testing Data display testing Final system testing May 02-04 Team Information Team Members: Jason Muehlmeier Yohan Blount Steven Woerdehoff Paul Jonak Advisors: Dr. John Lamont Dr. Ralph Patterson III Client: Herbert Harmison herbh@iastate.edu Budget Total Estimated Effort is 550 Hours Financial BudgetPersonal Effort Budget Utilize obsolete PC’s to compile and display the data collected. Use current transformers and digital meters to measure power usage. Transmit and receive data using household wiring; possibly X-10 protocol. HARD WIRE RECEIVE DECODE SERIAL TOTAL POWER MEASUREMENT HARD WIRE ANALYSIS DISPLAY APPLIANCE MODULE FOR ON / OFF TIME HOME WIRING ENCODING (A / D) TRANSMISSION Total Estimated Budget is $200 HARD WIRING SERIAL HOME WIRING SERIAL