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Improving hot water heating efficiency ... with cold water
Gizmag ^ | April 4, 2013 | Darren Quick

Posted on 04/05/2013 10:30:55 AM PDT by Freeport

Apart from heating and cooling the house, water heating is one of the biggest energy drains in the average home. But what if you could literally use cold water to create hot water? That’s just what San Diego inventor Hal Slater claims to have done with the creation of a water heater system that promises to improve water heating efficiency by as much as 50 to 100 percent.

The system works on the basis that cold water supplied to households in temperate climates averages around 70° F (21° C), which the researchers say is 15° to 20° F (8° to 11° C) warmer than it needs to be. By using a small water-to-water heat pump, the system extracts this excess heat from water in a 20-gallon (76 liter) cold water tank and delivers it to a typical 50-gallon (189-liter) water heater.

With funding from a grant from the California Energy Commission, Slater teamed up with a research team from the University of California, San Diego (UCSD), led by Dr. Jan Kleissl of the Mechanical and Aerospace Engineering Department, to test the system. To test real-world performance and determine the effects of different incoming cold water temperatures, they installed three prototype systems in homes in coastal, mountain and desert climates. They also monitored each system for a year to compare performance over different seasons.

(Excerpt) Read more at gizmag.com ...


TOPICS: Business/Economy; Society
KEYWORDS: heating; heatingandcooling; heatingandcoolong; heatpump; hotwater; waterheater
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To: Freeport
I used a ground water heat pump to heat my house for a number of years. It was a maintenance nightmare. I finally pitched it when the main freon-to-water heat exchanger began to leak freon. It would have been extremely costly to replace.

It was great while it worked, if the maintenance costs were ignored. I also just dumped the cold water. There was a convenient lake nearby. The deer liked the open water. BTW, the well water was a consistent 50 degree year round. Ground water is always at the average annual temperature (or warmer).

41 posted on 04/05/2013 7:41:45 PM PDT by norwaypinesavage (Galileo: In science, the authority of a thousand is not worth the humble reasoning of one individual)
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