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The first two data points are not represented in the graph, and were not used to find the logarythmic model equation. | The first two data points are not represented in the graph, and were not used to find the logarythmic model equation. | ||
The Excel-generated logarythmic equation to describe this graph is: 10.058Ln(x) | The Excel-generated logarythmic equation to describe this graph is: 10.058Ln(x) 23.045. Again, the first two ungraphed data points, for 11:54 and 11:55, were not considered in generating this equation. | ||
This information was converted to wikitext from Excel with the help of [http://de.wikipedia.org/wiki/Benutzer:Duesentrieb/csv2wp_ | This information was converted to wikitext from Excel with the help of [http://de.wikipedia.org/wiki/Benutzer:Duesentrieb/csv2wp_(en) csv2wp]. | ||
=Correspondence= | =Correspondence= | ||
[[user:aaron|Aaron Antrim]] to Gaviotas <nowiki> | [[user:aaron|Aaron Antrim]] to Gaviotas <nowiki> | ||
Revision as of 05:59, 10 June 2007
Solar hot water systems in other locales
In may parts of the world, solar hot water systems are affordable and useful, for example in Israel and Greece. Even in the United State 1 in 50 homes has some sort of solar collector on the roof (Bull and Hazeltine 242). In Bolivia, the Gaviotas Foundation installed many rooftop solar hot water systems on new apartment buildings and other structures (Wiesman).
Solar hot water systems in Parras
There are three rooftop solar systems in Parras:
Current water heating methods in Parras
Currently, most families heat their water using gas-fired water heaters. There is evidently some concern about the cost of gas, as many families use the hot water heater as part of a manual on-demand system, where they light the heater only immediately before it is needed. At Zaragoza #1, people already make use of solar radiation to heat their water. Señora Rosa Guadalupe Vinelna said that it is not necessary to turn on the gas hot water heater during the day. This could be because it retains heat, or because of solar radiation the outdoor water heater tank absorbs, or a combination of both.
An appropriate solar hot water implementation must be affordable enough for households to justify its cost on the basis of energy savings. See Effectiveness of Home Solar System for an evaluation of the Zaragoza system.
Potential for solar hot water heating systems in Parras
Year-round weather in Parras
Parras is a high desert oasis town in northern Mexico. The abundance of water combined with year-round sun exposure makes Parras an ideal location for solar hot water heating implementations
Testing
July 9 2006 - materials heating performance comparison
This test was to determine which pipe materials and sizes absorb sunlight energy and transfer heat to water most effectively.
- Weather
- mostly sunny
- Beginning ambient temperature
- 36° Celsius
- Ending ambient temperature
- 35° Celsius
Test results table
Material | Start time | End time | Time elapsed | Starting water temp (Celsius) | Ending water temp (Celsius) |
---|---|---|---|---|---|
1/2" Copper | 1:00 PM | 2:15 PM | 1 hr 15 mins | 30° | 60° |
3/4" Copper | 1:00 PM | 2:15 PM | 1 hr 15 mins | 30° | 60.5° |
1/2" Copper painted black | 1:00 PM | 2:15 PM | 1 hr 15 mins | 30° | 61° |
1/2" Black Plastic | 1:00 PM | 2:15 PM | 1 hr 15 mins | 30° | 59° |
1/2" Steel | 1:30 PM | 2:15 PM | 45 mins | 30° | 57° |
1/2" Steel painted black | 1:00 PM | 2:15 PM | 1 hr 15 mins | 30° | 63° |
16 July 2006 - time-based performance testing of black painted half inch copper
A half-meter length of half-inch black-painted copper pipe was filled with 30° water. The two ends of the pipe were sealed with duct tape. A multimeter with a thermocouple was insterted under the tape on one end of the pipe, allowing temperature measurements to be taken every minute. Weather conditions were full sun with an ambient temperature of 37°.
Test results table
Clock time | Minutes elapsed | Temperature (Celsius) |
---|---|---|
11:54 | 0 | 30° |
11:55 | 1 | 31° |
11:56 | 2 | 32° |
11:57 | 3 | 34° |
11:58 | 4 | 36° |
11:59 | 5 | 38° |
12:00 | 6 | 40° |
12:01 | 7 | 42° |
12:02 | 8 | 44° |
12:03 | 9 | 45° |
12:04 | 10 | 46° |
12:05 | 11 | 47° |
12:06 | 12 | 48° |
12:07 | 13 | 49° |
12:08 | 14 | 50° |
12:09 | 15 | 51° |
12:10 | 16 | 51° |
12:11 | 17 | 52° |
12:12 | 18 | 53° |
12:13 | 19 | 53° |
12:14 | 20 | 54° |
12:15 | 21 | 54° |
12:16 | 22 | 54° |
12:17 | 23 | 55° |
12:18 | 24 | 55° |
12:19 | 25 | 55° |
12:20 | 26 | 56° |
12:21 | 27 | 56° |
12:22 | 28 | 56° |
12:23 | 29 | 56° |
Graph of time versus temperature
The first two data points are not represented in the graph, and were not used to find the logarythmic model equation.
The Excel-generated logarythmic equation to describe this graph is: 10.058Ln(x) 23.045. Again, the first two ungraphed data points, for 11:54 and 11:55, were not considered in generating this equation.
This information was converted to wikitext from Excel with the help of csv2wp.
Correspondence
Aaron Antrim to Gaviotas <nowiki>
Pages in category "Parras Solar Hot Water"
The following 3 pages are in this category, out of 3 total.