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Analyzing Flow Restriction and Temperature Variability in Puerto Rico's Solar Water Heating System

This report evaluates the performance of a solar water heating model in Puerto Rico from January to December of the previous year. It identifies key issues such as air lock causing flow restrictions and excess energy loss due to elevated temperatures. The total water output was 35,140 liters with an average of 96.2 liters per day. Specific period averages varied, including a peak of 105.7 liters per day. The report highlights the importance of proper flow management and temperature monitoring to improve efficiency and align with model predictions.

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Analyzing Flow Restriction and Temperature Variability in Puerto Rico's Solar Water Heating System

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Presentation Transcript

  1. Model Validation

  2. -Air lock caused flow restriction, elevated temperatures -Excess energy lost to boiling and higher temperatures -Underperformed model predictions

  3. One Year In Puerto Rico • Jan 1 to March 31 • 8,234 Liters in 90 Days • Average of 91.5 Liters per day • July 1 to September 30 • 9,725 Liters in 92 Days • Average of 105.7 Liters per day • Apr 1 To June 31 • 9,219 Liters in 91 Days • Average of 101.3 Liters per day • October 1 to December 31 • 7,962 Liters in 92 Days • Average of 86.5 Liters per day 35,140 Liters Yearly Average 96.2 Liters per day December: 2,504 Liters (80.8 Liters / day)

  4. Warm-Up January 5 • Sunrise 6:57 am • 500+ Watts 9:00 am • First Liter 9:52 am • Sunset 6:01 pm • Total 89 Liters April 24 • Sunrise 6:01 am • 500+ Watts 9:00 am • First Liter 9:21 am • Sunset 6:44 pm • Total 99 Liters • August 15 • Sunrise 6:07 am • 500+ Watts 9:00 am • First Liter 9:09 am • Sunset 6:50 pm • Total 120 Liters • October 22 • Sunrise 6:20 am • 500+ Watts 9:00 am • First Liter 9:24 am • Sunset 5:57 pm • Total 104 Liters

  5. Warmup Characterization

  6. When conditions are such that after passing through the heat exchanger and the lower 2/3 of the collector the water has not yet reached temperature, the valve will restrict flow. This appears in the data as an oscillating temperature at the valve, as well as a “cycling” of output.

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