1. Total House Power Monitoring System Senior Design Spring 2003 – 18 (May03-18) Team Members: Matthew Gordon mgordie@iastate.edu Ying Luk ycluk@iastate.edu Sunil Roy Varghese sunil@iastate.edu Adam Wheeler amwheels@iastate.edumgordie@iastate.eduycluk@iastate.edusunil@iastate.eduamwheels@iastate.edu Client Herb Harmison Faculty Advisors Prof. James Triska Prof. Glen Hillesland Estimated EffortExpenses How much power is consumed by my computer and TV? This electricity bill is killing me. Why? Abstract Homeowners are currently unable to tell how power consumption is distributed in the home. They also only get feedback of their consumption on a monthly basis. The Total House Powering Monitor System will allow users to monitor power consumption of ones home in real-time. Hardware will be developed, using a wattmeter to measure the total power consumption. The data will be collected and send to a user interface and a database for long-term trend analysis. The interface will give the user the option of setting alarms and monitoring total consumption. Introduction General Background The total house power monitoring system will allow a homeowner to monitor total power consumption within his or her home. A read out of real-time power consumption measured in Watts will be displayed on an interface similar to a thermostat. Technical Problem A wattmeter will measure the real power coming into the home Measure voltage and current to calculate reactive power Record the data from the wattmeter and calculated reactive power Load data to PC for analysis and trends Operating Environment -Room temperature -Indoor use only -Meets all local electrical standards Intended User(s) and Use(s) -Homeowners -Small business owners -Does not automatically control power consumption Assumptions and Limitations Assumptions: - Single line read out - U.S. power (60 Hz) - (2) 120 volt lines into the home Design Requirements Design Objective - A wattmeter will read the power consumption. - Interface receives and displays the data - Interface signals the user of high power consumption - Spreadsheet will help the user see trends in power consumption Functional Requirements - Measure the total amount of power that is being consumed - Display the power consumption to the user - User will set alarms to warn of high power consumption - Data is collected into a database for later analysis Design Constraints - The programming language will have limitations in implementing the microprocessor operation - Protecting the system from an over-current by a fuse - Size – the interface will be similar in size to a thermostat - Size – the wattmeter will be wall mounted and fairly small Measurable Milestones - Wattmeter reads power accurately – compare to electrical meter (15 %) - Calculate reactive power – check against measured values (15%) - Store data from the wattmeter – check data against know readings (30%) - Interface displays the real and reactive power – check against measured values (25 %) - Database stores the data collected over a period of time – check against an electric bill (15 %) Limitations - Budget - Man hours - Delays in readout to power change Testing Description -Develop an analog method to monitor power consumption. -Check the capability of the system to display the correct information to the interface and store the data using short test cases -For the final product, run a long test case and compare to an electric bill End-Product Design The total house power monitor is a device that can monitor real and reactive power. The product monitors power coming into the home. There is a visual and audible method the unit uses to alert the user of high consumption situations. There is also the expandable capability of loading information retrieved by the device into a spreadsheet for further analysis and recovery of data. Technical Approach -Measure power with a wattmeter -Place the product at the fuse box. -Develop the interface and database simultaneously -Then develop the interface by which they will communicate with the measuring devices