10:00 am - 4:00 pm
619 Peacock Lane
Murphy, TX 75094
619 Peacock Dr.
Murphy, TX 75094
Tour Hours: 10am – 4pm
WarmSpring Solar Hot Water system:
This house features a patent-pending attic heat recovery system for warming a swimming pool or spa called WarmSpring. The combination of a conventional shingled roof and an attic space may be regarded as an unintended solar collector. The limited efficiency of a roof-attic comprised solar collector is offset by the large solar absorption area involved which typically consists of most if not all of the roof surface. WarmSpring works in the following manner: Hot air extracted from the attic space is blown through an air-to-water heat exchanger. As a fairly small flow of water (about four gallons per minute) passes through the heat exchanger, its temperature increases typically by 10 to 15°F. The warmed water then mixes with the water in the pool or spa and thereby distributes the heat. The small water flow rate in the heat exchanger loop allows the use of very inexpensive ¾” PVC tube and fittings.
This attic heat recovery system differs from earlier technology in that it will ventilate the attic space whether there is a requirement for warming water or not. In other words, during mid-summer, when a pool will get uncomfortably warm with supplemental heating, WarmSpring can revert to just functioning as an attic ventilation system in order to reduce the load imposed on the air conditioning. Additionally, the warming action of the system only requires a 140 watt pump to operate rather than relying on a typical 1.5 to 2 hp pool filter pump to function. WarmSpring systems will typically add hundreds of thousands of BTU’s to a pool or spa per day.
For this particular installation, WarmSpring is heating just a spa rather than a pool or a pool/spa combination. So in this case the warming function does get used during the summer whereas it generally does not for a pool application because it would cause overheating. Another feature of this installation is that it is among the first to use a backward-curved centrifugal blower with a WarmSpring heat exchanger. This high efficiency blower uses only 200 W to convey 1600 cubic feet per minute of air which is about twice as efficient as a fan from a home improvement store. Due to extensive vaulting of the ceilings on the first floor, the attic space is actually only a fraction of the size that it would appear to be from the outside. Nonetheless, it was necessary to add a temperature limiting switch to the system because the spa was reaching an excessive temperature of 108° F. The measures taken to camouflage the water lines going to the roof-mounted WarmSpring unit got excellent results. The tubes are hiding in plain sight.
Visitors are guests, please be courteous and polite. Tour hours are generally 10 a.m. to 4 p.m. Please don’t arrive early or late. Remember, tour hours may vary at some sites so it is important to check the individual tour host page on the DFW Solar Tour website to confirm visiting hours before you get started, non-standard tour times are indicated in red. There are no public restroom facilities at tour sites. Practice the Golden Rule and everything will work out great.