301 20th St. South
St. Petersburg, FL 33712
United States

Phone: 727.823.6766
888.99 SOLAR
Fax:   727.823.6768

E-mail us:
info@techno-solis.com

DHW System Types

DWH Systems for Temperate Climates

DHW Systems for Freeze Zone Climates

Direct Systems

The Direct Series systems, commonly found in the Southern United States and Tropical Climates, are referred to as direct because the sun�s heat is transferred through the collector directly to the usable waterline; no antifreeze is required. When the sun is shining, a pump circulates water from the bottom of a storage tank through collectors where it is heated, and then returned to the tank for storage and eventual use.

Direct System Features:

  • A Differential Control senses temperature differences between water leaving the collector and the coldest water in the bottom of the storage tank. When the temperature of the water in the collector is hotter than the water in the tank, the differential control operates the circulating pump.
  • A small photovoltaic solar panel option (which generates electricity from the sun) is available to operate the circulation pump, further reducing traditional energy consumption.
  • Freeze protection includes a thermally operated valve installed at the collector (where required) or by manually draining.

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Thermosyphon Systems

The Free Flow Series is a thermosyphon system. As a self contained solar water heating system, the Free Flow Systems have collector(s) positioned lower than the tank(s) and operate on the principle of natural convection. As the sun heats the water in the collector, it expands slightly and becomes lighter, causing the water to rise into the tank in the same way that a balloon rises in the air. The colder, heavier, water in the tank then sinks into the collector. These events create a continuous natural circulation.

Free Flow System Features:

  • Thermosyphon systems are widely accepted throughout the world today. They
    are automatic, simple, and reliable.
  • Thermosyphon Systems do not require a pump or control.
  • There are no moving parts which allows for minimal, if any, maintenance concerns.

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Indirect Systems

Closed Loop Systems are a type of system, sometimes simply referred to as �Indirect� because the sun, through a roof mounted collector, heats fluid circulating in a closed off solar loop which never comes in direct contact with usable water stored in an insulated tank.

Indirect Pressurized System Features:

  • Accommodates climates where freezing weather occurs more frequently.
  • A Differential Control senses temperature differences between water leaving the collector and the coldest water in the bottom of the storage tank. When the temperature of the water in the collector is hotter than the water in the tank, the differential control operates the circulating pump.
  • A heat exchanger is located within the storage tank to maximize the heat transfer from the antifreeze solution to the coldest water in the storage tank.
  • A small photovoltaic solar panel option which generates electricity from the sun) is available to operate the circulation pump, further reducing traditional energy consumption.

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Drainback Systems

The Drainback Series is an indirect system. It is referred to as �indirect� because the sun, through a roof-mounted collector, heats fluid circulating in a closed-off solar loop which never comes in direct contact with usable water stored in an insulated tank.

Direct System Features:

  • Removes all water from the collectors, and their pipelines to ensure they never freeze when the system is not producing heat (drain mode). Each time the pump shuts off, the water in the collector(s) and piping, which are mounted at a slight angle, drains into the insulated reservoir tank.
  • A sight glass attached to the reservoir tank indicates that the collector(s) has been completely drained.
  • A Differential Control senses temperature differences between water leaving the collector and the coldest water in the bottom of the storage tank. When the temperature of the water in the collector is hotter than the water in the tank, the differential control operates the circulating pump.
  • Less moving parts allows for fewer maintenance concerns.

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