Analysis: Future Analysis: Future Truck Truck
Thermoelectric Thermoelectric SystemSystem
Customer: PBJ XaustorsCustomer: PBJ XaustorsRobert Wiegers Robert Wiegers Richard StatlerRichard StatlerKhurram KemalKhurram Kemal
ME430 Fall 2003ME430 Fall 2003Professor Michael AndersonProfessor Michael Anderson
IntroductionIntroductionObjective:Objective: Experimentally determine the effect of different loads on Peltier chip bank.Experimentally determine the effect of different loads on Peltier chip bank. Measure the power output of the thermal electric system constructed by the Measure the power output of the thermal electric system constructed by the
PBJ XaustorsPBJ Xaustors Use calibration/regression statistical method to analyze the collected dataUse calibration/regression statistical method to analyze the collected data From the analysis present opinion on the best load for chip bankFrom the analysis present opinion on the best load for chip bank
Motivation:Motivation: To help create a lower emission environment friendly vehicleTo help create a lower emission environment friendly vehicle Exhaust recover system will recover the waste energy off the exhaust of Idaho Exhaust recover system will recover the waste energy off the exhaust of Idaho
Future Truck Future Truck
Background:Background:The system has been created by the PBJ Xaustors which can do the following: The system has been created by the PBJ Xaustors which can do the following:
capture the heat on the surface of pipes and convert it into the electricitycapture the heat on the surface of pipes and convert it into the electricity Does not put extra load on the engineDoes not put extra load on the engine Utilizes a system of Peltier chips which produces power when a Utilizes a system of Peltier chips which produces power when a
temperature gradient across the chip is presenttemperature gradient across the chip is present
Experiment DiagramExperiment Diagram
Labview running on computer
Variable heatsource
Heat sinkplaced on top of chips
Field pointmodule controller
Chip banks
Data ReductionData Reduction Initial Calculations:Initial Calculations:
As the data is being read into the file calculations are completed using As the data is being read into the file calculations are completed using labviewlabview
The above equation is the equation for power = P using Voltage = V The above equation is the equation for power = P using Voltage = V and Load Resistance = Rand Load Resistance = R
Using this equation allowed for the graph of temperature difference Using this equation allowed for the graph of temperature difference vs. power to be createdvs. power to be created
Calibration Regression:Calibration Regression: Experimented with more powers for fit but found over quadratic Experimented with more powers for fit but found over quadratic
extraneousextraneous Data captured by Field point modules was analyzed by LabviewData captured by Field point modules was analyzed by Labview Labview data exported into Excel and read into MathCADLabview data exported into Excel and read into MathCAD Statistical analysis was completed with MathCADStatistical analysis was completed with MathCAD
Statistical Analysis:Statistical Analysis:
The above equation is the quadratic used to model the system with the The above equation is the quadratic used to model the system with the betas being solved for from the data gatheredbetas being solved for from the data gathered
Experiment DesignExperiment Design Controls:Controls:
Using Labview and field pointUsing Labview and field point Exported into excel and then MathCADExported into excel and then MathCAD This allows for small error in the measurement and saves time This allows for small error in the measurement and saves time
entering dataentering data Accuracy:Accuracy:
The equipment being used, Field point and Labview, has high The equipment being used, Field point and Labview, has high accuracyaccuracy
This leads to smaller errors in the values that are collectedThis leads to smaller errors in the values that are collected Since all the collection and analysis is completed independent of Since all the collection and analysis is completed independent of
operator the is little human error in the recording and analysis of operator the is little human error in the recording and analysis of the data. the data.
Measured DataMeasured Data
5.2 Ohm – Black Line3.8 Ohm – Red Line11.8 Ohm – Aqua Line
Raw data taken Raw data taken straight from Labview and straight from Labview and read by MathCAD. The read by MathCAD. The time interval for time interval for gathering the data was gathering the data was once every 10 seconds. once every 10 seconds. The data was captured The data was captured until the temperature until the temperature differential was differential was approximately 85Fapproximately 85F
A distinct difference A distinct difference can be noticed between can be noticed between the different loads on the the different loads on the chip bankchip bank
5.2 Ohm looks like 5.2 Ohm looks like the best from the graph the best from the graph but the statistical analysis but the statistical analysis needs to be completed to needs to be completed to be confidentbe confident
Statistical AnalysisStatistical Analysis
5.2 Ohm – Black Line3.8 Ohm – Red Line11.8 Ohm – Aqua Line
The best fit curves The best fit curves for each of the different for each of the different resistive loads are shown resistive loads are shown on the graph as the on the graph as the middle line of the three of middle line of the three of same colorsame color
The confidence The confidence intervals are graphed as intervals are graphed as well as the outer two lines well as the outer two lines of the threeof the three
Methods including Methods including using half as many data using half as many data points and looking into points and looking into higher power equations. higher power equations. When these were When these were investigated it was found investigated it was found that a quadratic curve fit that a quadratic curve fit was sufficient and a was sufficient and a halving of the data points halving of the data points didn’t effect the outcome.didn’t effect the outcome.
ConclusionConclusion
Ideal Resistance Load = 5.2 Ideal Resistance Load = 5.2 OhmsOhms
Questions?Questions?
