# Solar radiation lab

Outline:
We will calculate the efficiency of two solar energy harvesting systems: the PPA photovoltaic array above the elab, and the solar thermal panels above the bathrooms at Perry-Fiske (neé "Anna's").

Steps: PV array
1. Measure the dimension in meters of one panel of the PPA array above the elab
2. Count the total number of panels
3. On elab2.hpa.edu, measure both the energy harvested from the array around noon or whenever you took your data, and the solar radiation here at the same time (look under "Telemetry"->"HPA Energy")
4. Alternate data source: http://elab4.hpa.edu/cgi-bin/EMCcgi?, look under "dashboards" then "other dashboards" for the one called "HPA campus energy". You can also use "monitor" to graph solar and radiation data.
5. Multiply the solar radiation (in W/m2) by the area (in m2) to get total Watts of solar energy falling on the panels.
6. Divide the harvested energy (in Watts) by the radiation (in Watts) to get % efficiency (recall the number should be less than 1.00 or 100%)
7. How many kWh per day would this array provide at 5.5 solar hours per day?
8. How many \$ is this, assuming \$0.40 per kWh?
9. HPA has the option to purchase the PPA array in 2 years for about \$150K. What would be the TCO and ROI for this array if it lasts another 15 years?
10. How big (panels or m2) would the array have to be if it were 95% efficient (like solar thermal) gathering the same power?

Steps: Solar thermal array, Perry Fiske
1. Count the number of panels on the bathrooms at Perry-Fiske (both buildings)
2. If each panel is 2 meters wide and 3 meters tall, what is the total area of one panel?
3. What is the total area of all of the panels?
4. If these panels are 95% efficient, using the same solar insolation (radiation) numbers from above, how many Watts of power would you expect from this array?
5. How many kWh would this provide, if it ran for 5.5 hours per day?
6. How many \$ is this, assuming \$0.40 per kWh?
7. If this array cost \$2000 per panel, what would be the TCO for one panel?
8. What would be the ROI if it worked for 20 years?
9. If propane produces 23 kWh per gallon, how many gallons of propane have we avoided in 20 years?
10. If 12 pounds of CO2 are released for every gallon of propane, how many pounds of CO2 did we avoid in 20 years?
11. How could drones be used on our campus to make certain our solar thermal panels are working properly? (hint: think of the thermal camera we tested in class)
12. Our pool has a very low efficiency solar thermal system on the roof of the locker rooms. How are these leaks costing the campus money?
Green New Deal: carbon neutral by 2030
1. How is this like the New Deal in the Roosevelt era?
2. How is this like the moonshot in 1960?
3. What would be different about our country if we were net carbon neutral in 2030?
4. What impact would this have on climate change, directly and indirectly?
5. People will be asking you about this, since you know so much about energy. What would you tell them?