Customer Handoff & Final Project Documentation
Table of Contents
Test Results SummaryAll data collected during our testing has been compiled into one spreadsheet, and can be found Here
An Alternate way to look at our data, showing the correlation between efficiency, solar flux, and delta T.
The SRCC categorizes our panel with the orange efficiency curve in the image above. The blue line represents the efficiency trend-line curve of our data.
The efficiency curve comparison shows that our data does not exactly match the SRCC expected performance. However the optical efficiency (y-intercept) is very close between the two curves.
FeasibilityA heat analysis was preformed on the hot tub system.
- No heat transfer through the sides and bottom of hot tub.
- Only heat transfer through 3 in. polyurethane foam cover.
- No Convection/Radiation.
- Constant Collector inlet temperature of 100°F.
- Ambient temperature in the summer, fall, winter, spring; 70, 55, 30, 50°F respectively .
- Efficiency determined from SRCC efficiency curve.
- High solar flux categorized as 262.5 W/m^2
- Medium solar flux categorized as 196.8 W/m^2
- Low solar flux categorized as 129 W/m^2
The analysis concluded that the solar collector would be able to provide enough energy to maintain the temperature of the hot tub during periods of high solar flux through all seasons except winter, and partly during periods of medium to low flux through the seasons of fall to spring. 0 W gains can occur due the efficiency of the collector being less than zero, which in practicality would result in the collector not running.
Risk and Problem Tracking
- Our updated problem tracking can be seen here.
- Our final risks can be seen here.
Final Project Documentation
- Our Customer Requirements can be seen here.
- Our Engineering Requirements can be seen here.
Performance Vs. Requirements
- Our table of requirements vs system performance can be seen here.
Bill of Materials
Above is our full cost tracking spreadsheet for all items purchased with their actual cost. Rather than just show the cost that was actually paid for the items, the team thought it best to include both the estimated cost of the items (which were based on online research) as well as the true price paid. We felt this was important as a guide for other groups wanting to complete this project independently. The prices found in the color coded BOM (top) represent values found online and were independent of any local pricing, sale pricing, shipping costs, or other discounts given to the team as a student project. Discrepancies between the two exist due primarily to variance between online and store pricing, as well as shipping costs. This will help eliminate the argument that special pricing was given and paints a clearer picture that a project of this nature is truly affordable. Also, the color coded BOM is more complete, in that it details all required materials needed to complete this project. Whereas the second BOM is more of a receipt used by the team & MSD office to track our actual spending.
- Our full BOM can be seen here.
Final Collector Stand Drawing Package
Above is the complete drawing package for our final stand build. After several iterations and revisions, our final build will be to these specifications. The drawing PDF can be downloaded here
Final Electrical Diaphragm
- Above is shown the final electrical diagram for the system using the diaphragm pump, and 12V batter.
- In the case of the centrifugal pump, their are alligator clips connected to the pump which are directly connected to either the battery or PV panel.
Final PlumbingBelow is the final plumbing schematic for the system.
Below is picture of the actual system.
Paper and Poster
- Our team's technical paper can be seen here.
- Our team's final poster can be seen below.
Recommendations for future work
- Fully automated data collection
- Adjustable collector angle
- Automated solar tracking system
Notes from Review
- Put performance vs. requirement Excel sheet on EDGE
- Put the actual expenditures on EDGE
- Plot the SRCC data compared to our data
- Add flow rate data to EDGE
- Money payback formula from paper on EDGE
- Convert the BTU/hr to kW
Plans for Wrap-up
- Organize time for customer to pick up system and take to home