Pre-heat glycol system
How does a Pre-Heat system
work?
Heat from the sun is captured by the collector which is mounted on the
roof. Fluid is circulated by a pump through a closed-loop. The fluid
circulates through the collector and the solar tank, where the heat is
transferred into the household water via a heat exchanger inside the
tank. When it is cloudy or raining and there isn't enough sunlight to
generate heat, the existing water heater functions as normal to provide
hot water to the home. This type of system is known as a closed-loop
glycol system because glycol circulates through the collector loop to
avoid freezing during the winter.
Latest Technologies
In this active, closed-loop system, incoming potable water is routed to the solar storage tank, but never into the collectors. A water and antifreeze mixture circulates from the collectors through a coil of pipe in the solar tank, and then is pumped back through the collectors. (In most climates, a 50/50 propylene glycol and water mixture will keep collectors from freezing.) The potable water is warmed by heat transfer through contact with the pipe.
These systems require an expansion tank
and a few other auxiliary components for filling, venting, and
maintaining the system. A definite advantage to antifreeze systems is
that the collectors can be mounted anywhere.
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Quality Standards
Solar Rating and Certification Corporation
The Solar Rating and Certification corporation currently administers a certification, rating, and labeling program for solar collectors and a similar program for complete solar water heating systems. Collector testing apparatus SRCC’s certification program operating guidelines, test methods and minimum standards, and rating methodologies require the performance of nationally accepted equipment tests on solar equipment by independent laboratories which are accredited by SRCC. The test results and product data are evaluated by SRCC to determine the product’s compliance with the minimum standards for certification and to calculate the performance ratings. Equipment which has been certified and rated by SRCC is required to bear the SRCC certification label which shows the performance rating for that product. In addition, each certified product is published by SRCC in a directory. Each product’s directory listing contains information on the product’s material and specifications as well as the certified thermal performance.
read moreAdditional Systems
- DRAINBACK SYSTEMS
- EVACUATED TUBE COLLECTORS
- FLAT PLATE COLLECTORS
- OPEN LOOP Systems
- THERMOSYPHON SYSTEMS
- SOLAR POOL HEATING
- SOLAR CONTROLLERS
- solar storage tanks
- pASSIVE ICS Systems
- SRCC OG-100 COLLECTORS
- SRCC OG-300 SYSTEMS
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