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

Parras shwh tempvsminutes.gif

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.

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