College of Engineering, Forestry, and Natural Sciences Dept. of Mechanical Engineering Solar Irradiance Measuring Device Joey Cavaretta Allison Venezia John Hills Tim Tormey Peter Journell Nick Jurik Team 20 11/9/2012 1
Overview • Introduction • Problem Statement • Tripod Acquisition • Sensor Mount • Data Transfer • Data Analysis • Timeline • Resources Joey Cavaretta 11/9/2012 2
Problem Restatement Problems with current site o Covers to much surface area o Data collection errors o High cost Goal: Design a relatively small, portable solar irradiance measuring system that can accurately quantify variance in solar irradiance over a larger area. Joey Cavaretta 11/9/2012 3
Tripod Options • Acculine Pro Tripod o Lightweight, durable o Feet have sharp metal points • Manfrotto Aluminum Tripod o Leg angles: 25°, 46°, 66°, 88° • Vanguard MT-23 Metal Tripod o Supports 8.8 lb o Spiked feet • Slik Sprint Pro Tripod o 18.5 inches when folded Acculine Pro Manfrotto Vanguard MT-23 Slik Sprint Pro Cost $ 99.95 112.73 44.95 89.95 Allison Venezia 11/9/2012 4
Auto Leveling Mount • Auto levels as soon as tripod is placed • Stays level with changing ground conditions John Hills 11/9/2012 5
Li-Cor 2003S Fixture • Off-the-shelf product • Don’t know price of fixture John Hills 11/9/2012 6
Data Transfer • Wireless: o Electrical engineering component difficult o High cost o Low reliability • Wired: o Simple setup o Sensors come with 50 foot cable o Negligible voltage drop Tim Tormey 11/9/2012 7
Data Transfer • Wires will be housed in flexible conduit • Protects wires from o Cows o Rodents (ie. Field mice) o Ultra violet rays o Water Tim Tormey 11/9/2012 8
Current Data Analysis • Statistical analysis to guide future data processing • Compare this smaller grid to the larger site Station 12 Peter Journell 11/9/2012 9
Irradiance Vs. Time Irradiance (W/m 2 ) Station 12 Peter Journell Time starting at 10am (seconds) 11/9/2012 10
Average Irradiance Vs. Time Irradiance (W/m 2 ) Time starting at 10am (seconds) Peter Journell 11/9/2012 11
Natural Variance of Irradiance Nick Jurik 11/9/2012 12
Daily NVI Station NVI Notes 8 0.02369 12 0.03642 • Most stations exhibit 13 0.02054 similar NVI values 14 0.02093 • Station 12 still an outlier 18 0.02174 42 0.02213 Average 0.02424 Nick Jurik 11/9/2012 13
Hourly NVI Station 12 NVI Time (hours after 10am) Nick Jurik 11/9/2012 14
10 Minute NVI Station 12 NVI Time (tens of minutes after 10am) Nick Jurik 11/9/2012 15
Where to go from Here? • Determine irradiance as a function of time and separation distance • Try to model cloud movement • Investigate data from station 12 Station 12 Nick Jurik 11/9/2012 16
Timeline John Hills 11/9/2012 17
References "Prevailing Wind Direction." Http://www.wrcc.dri.edu/ . N.p., • n.d. Web. 03 Nov. 2012. <http://www.wrcc.dri.edu/htmlfiles/westwinddir.html> Flood, Ronald K., Dr. Tom Acker, and David Willy. Prescott • Airport Solar Facility Solar Variability Study . Tech. N.p.: n.p., n.d. Print. Team 20 11/9/2012 18
Questions? Team 20 11/9/2012 19
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