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- Page 1 Guide to SelectinG and inStallinG a olar ater yStem By Dan Gretsch, P.E. Renewable energy Made Simple. USA: R.W. Beckett Corporation • ph: (800)645-2876 • fax: (440)327-1064 | Canada: R.W. Beckett Canada Ltd. • ph: (800)665-6972 • fax: (519)763-5656 | www.beckettcorp.com...
- Page 3 Guide to SelectinG and inStallinG a olar ater yStem Introduction There has been a lot of press lately about the growth of renewable energes and the need for energy ndependence. There have been artcles wrtten about Solar Electrc (PV), wnd, ethanol, bo- desel, and hydroelectrc.
- Page 4 increases the value of your home dollar for dollar, pays you 30-50% back on your next tax bill, and pays you back 14% per year. I can thnk of no other nvestment that even comes close. So why haven’t people jumped on the bandwagon? Unfortunately there are many reasons.
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Page 5: Section 1: Selecting A Solar Hot Water System
nstalled on prmary resdences after January 1, 2009. In addton, a number of states provide either tax credits or rebates for a solar hot water system. A standard Beckett SolarHot system wll pay for tself n 5 to 7 years, dependng on usage. Chapter 2: Siting the Collectors Proper placement s all about the sun. - Page 6 is maximizing the direct sunlight. However, a solar thermal panel can be as high as 80% efficient at transmitting direct sunlight into usable energy. Because of the much higher efficiency, siting is not as crtcal, although t s stll mportant. You want to nstall your solar panels n a spot that receves drect sunlght from 9 a.m.
- Page 7 t for us. The Beckett SolarHot Advantage: Our systems are scalable. It s easy to add addtonal collectors to the system. It’s just as easy to use a larger hot water tank or put two standard tanks together n case you decde that you need addtonal hot water storage.
- Page 8 Ths rule of thumb s approprate for hgh qualty solar collectors, such as the Beckett SolarHot’s Platinum collector series. I am defining a high quality solar collector as having ether black chrome plated absorber or havng some form of selectve surface. The glazng (glass) on the collector needs to be hgh-transmsson tempered glass.
- Page 9 1.5 gallons or more of storage for every sq. ft. of collector. The Beckett SolarHot Advantage: Our system ntegrates hot water tanks of multple capactes nto the solar system. Ths creates a scalable, economcal soluton for your hot water storage needs.
- Page 10 The larger the heat exchanger, the higher the cost. You want as much heat exchanger surface area as you can afford. The Beckett SolarHot Advantage: SolarHot has uniquely created the SolVelox package, whch pre-assembles and ntegrates an overszed, stanless steel heat exchanger along with the pumps and valves necessary to drive a two-loop solar system.
- Page 11 temperature as the storage tank bottom, the pump automatcally turns off. If your location experiences freezing conditions, even if it is only once every 5 years, I recommend nstallng a freeze protected system to elmnate the concerns of havng ppes or collector freeze up durng a “freak”...
- Page 12 (hence the name). The Beckett SolarHot Advantage: Our system uses a double-pumped efficient design as mentoned above. It comes wth the two closed loops already pre-assembled n the SolVelox package in order to reduce both your installation effort and potential assembly ssues.
- Page 13 80 gallon tank and all of the piping be run from there. With a profile of only 3” off the tank, t s deal for tght spaces as well. The Beckett SolarHot Advantage: Complete systems include an oversized external heat exchanger which can be easily mounted on the exterior of an unmodified standard hot water tank.
- Page 14 You don’t require a drainback tank in this system but you will require an expansion tank. The expansion tank should be szed to the overall volume of the ppng and collectors. For proper szng of your expansion tank, see http://www.amtrol.com/thermxtrol.htm. The expansion tank that you use should be mounted below or besde the connecton to the ppng.
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Page 15: Section 2: Installing A Solar Hot Water System
s your call. I prefer that collectors appear unobtrusvely on the roof rather than havng them as a stylstc feature. The Beckett SolarHot Advantage: The SolarHot collectors come in an extruded black alumnum casng whch provdes an attractve look on the roof, smlar to a low- profile skylight. - Page 16 The Beckett SolarHot Advantage: The Platnum seres of collectors ncludes unons wth gaskets to facltate nstallaton on the roof. The mountng hardware s desgned to allow you to easly snap the collectors nto ther lower mountng clps, reducng your handlng tme once on the roof.
- Page 17 If you are nstallng a glycol system, or a dranback/open loop system wth a relatvely hgh lmt on the storage tank (170 F+), you wll need to use rubberzed nsulaton for nsulatng the ppes. The more common polyethylene nsulaton can’t handle the hgh heat and wll melt. If you use a lower hgh lmt on your tank you can use the less expensive insulation.
- Page 18 See the chart below to find which pumps are appropriate for which application. Different manufacturers pumps can be cross-referenced with this list or the above head/flow graph. The Beckett SolarHot Advantage: The pumps for both loops come already packaged into the Solvelox assembly. This gives you confidence that your customer will have the rght pumps at the tme of nstallaton.
- Page 19 Chapter 9: Placing the collectors Warning: All work more than 5’ above the ground should be conducted with the appropriate fall protection equipment. We have already covered the proper stng and szng of the solar collectors, now we wll delve nto the proper placement.
- Page 20 If you do not have access to the attc from underneath: Peel back the shngles from the edge of the roof to determne where the roof deckng sheets are joned. Make a chalk lne perpendcular to the roof slope that goes through that pont. Now that you have identified a single rafter you should snap chalk lines parallel to your perpendcular lne (spaced to concde wth the rafters underneath) untl you have all of the rafters marked underneath the area where you wll be placng the collectors.
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Page 21: Chapter 10: Charging The System
Chapter 10: Charging the system I recommend that prior to filling the system you pressurize it with compressed air (to 60 p.s.i.) to check for leaks. The system should be able to hold pressure for 15 mnutes wthout pressure loss. Once you have ensured that the system doesn’t leak, you are ready to fill the system. -
Page 22: Appendix A: Destratification
The Beckett SolarHot Advantage: The SolVelox package comes with a special dip tube to prevent destratification. The system is also designed to pull the coldest water from the bottom of the tank or (f water s comng nto the tank) the cold ncomng water, thus improving the overall efficiency of the system. -
Page 23: Appendix B: Evacuated Tube Collectors
Appendix B: Evacuated Tube Collectors Many tmes I have been asked, “What about evacuated tube collectors?” Evacuated tube collectors are long cylindrical glass vacuum tubes that have a copper filament that extends down the length of them. A collection of these is connected to a separate header. The collection fluid flows through the header, which is coupled to each of the vacuum tubes. -
Page 24: Appendix D: Resource Links
Appendix D: Resource Links www.solarH2Ot.com - A full servce solar thermal manufacturer and dstrbutor. They carry pumps, controls, heat exchangers, valves, collectors, as well as manufacturing systems to ease installation. They provde engneerng servces for larger nstallatons as well. www.ases.org - A natonal organzaton dedcated to advancng solar energy. -
Page 25: Appendix F: Pictures Of Installations
Appendix F: Pictures of Installations Appendix G: About the Author Dan Gretsch s a regstered Professonal Engneer. He receved hs Bachelors and Masters Degrees n Engneerng from the Georga Insttute of Technology. He has been a facltes engneer, Engneerng Supervsor, Engneerng Manager, and Dvson Engneerng Manager. He was responsble for mprovng the efficiency in the corporations’... - Page 26 95% absorpton rate ■ Clean attractve desgn ■ Insulated to “lock-n” the heat ■ USA: R.W. Beckett Corporation • ph: (800)645-2876 • fax: (440)327-1064 | Canada: R.W. Beckett Canada Ltd. • ph: (800)665-6972 • fax: (519)763-5656 | www.beckettcorp.com © SOLARHOT 2006-2009...
- Page 27 Our highly efficient heat exchange process means the ■ pumps run less savng you even more money USA: R.W. Beckett Corporation • ph: (800)645-2876 • fax: (440)327-1064 | Canada: R.W. Beckett Canada Ltd. • ph: (800)665-6972 • fax: (519)763-5656 | www.beckettcorp.com © SOLARHOT 2006-2009...
- Page 28 CORPORATION USA: Mail: P.O. Box 1289 | Elyria, OH 44036 ● Ship: 38251 Center Ridge Rd. | North Ridgeville, OH 44039 Canada: R.W. Beckett Canada, Ltd. · Unt #3, 430 Lard Road · Guelph, Ontaro N1G 3X7 www.beckettcorp.com Form No. 61740 R00, Prnted n the USA 07/09...