GREEN SYSTEMS | SOLAR SOLUTIONS | CONTINUED FROM PAGE 146
34-2, was configured to provide the same heating functions and advantages that a primary loop system would have done. The result is a piping system that resembles a Combi 101 system with a very compact flow center with a built-in pump manifold. As a unique variation, this design requires a circulator pump on the water side of the solar heat exchanger to deliver solar heated fluid to the flow center when it is available. It is an unconventional use of the top pipe connections on the Hydrolink, but it works much like the Combi 101, with one additional circulator.
Hydraulic separator installation using PAW modules Figure 34-3 shows a piping diagram taken from a group
148
of solar heating installations that were all designed around the brass modular equipment manufactured by PAW. This line of equipment provides hydraulic flow separators, pump modules and manifolds that can be joined directly together with integral unions or spaced apart using connective piping. As you can see in the diagram, we did a little of both, so that our solar heat exchanger could be mounted in a series flow path between the cool return manifold and the hydraulic separator. By using this configuration, we were able to maintain the same functions and performance as our standard Combi 101 system, with the same number of pumps, using the same control system and control strategies
that have proven most effective over the years. The three piping configurations described here all
provide the same heating functions and the same eight design advantages as a Combi 101 solar heating system. All of these heating designs have been installed in different variations multiple times and exist today in functioning
Figure 34-3
buildings. All of them have been outfitted with the same types of control functions, without much modification of the controls systems from one installation to another. Both the older style controls, using differential thermostats and relays, and our newer SLIC (computer based) control systems have been applied to primary loop and hydraulic separator configurations alike with equal success. This bodes well for more and better modular solar heating systems in the near future. These articles are targeted
toward residential and small commercial buildings smaller than 10,000 square feet. The focus is on pressurized glycol/hydronic systems, since these systems can be applied in a wide variety of building geometries and orientations with few limitations. Brand names, organizations, suppliers and manufacturers are mentioned only to provide examples for illustration and discussion and do not constitute any recommendation or endorsement. l
Bristol Stickneyhas been e Circle 101 on reader reply card
designing, manufacturing, repairing and installing solar hydronic heating systems for more than 30 years. He holds a Bachelor of Science in Mechanical Engineering and is a licensed mechanical contractor in New Mexico. He is the chief technical officer for SolarLogic LLC in Santa Fe, N.M., where he is involved in development of solar heating control systems and design tools for solar heating professionals. Visit www
.solarlogicllc.com.
phc may 2011
www.phcnews.com
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