Solar 2017-07-25T11:25:38+00:00

SOLAR

Solar water heaters are a cost-effective way to generate hot water for your home. They can be used in any climate, and the fuel they use, sunshine, is free.

Solar water heating systems are made up of storage tanks (or geysers), and solar collectors.
There are two types of solar water heating systems:

Pumped systems

Pumped systems have circulating pumps that circulate the hot water from the solar collector panels to the geyser and the cold water from the bottom of the geyser to the panels to be heated again. Controllers regulate the circulation pump to turn on and off to maintain a set temperature in the geyser.

Thermosiphon systems

Thermosiphon or passive systems don’t require circulation pumps. In thermosiphon systems, water flows through the system when water heated by the collector rises as cooler water sinks. The collector must be installed below the storage tank so that hot water will rise into the tank.

Two types of solar collectors are used for residential applications:

Flat-plate collector

A flat-plate collector consists of an absorber, a transparent cover, a frame and insulation. Usually a low iron safety glass is used as a transparent cover as it lets trough a great amount of the radiation from the sun. Simultaneously, only very little of the heat emitted by the absorber escapes the cover (greenhouse effect). In addition, the transparent cover prevents wind from cooling the absorber.

Evacuated-tube solar collectors

Evacuated tube collectors contain a copper heat pipe, which is fitted into an absorber plate, inside a vacuum sealed glass tube. The heat pipe is hollow and the space inside is also evacuated. Inside the heat pipe is a small quantity of freeze resistant liquid. The vacuum enables the liquid to boil at lower temperatures than it would at normal atmospheric pressure. When sunlight falls onto the surface of the absorber, the liquid in the heat tube quickly turns to hot vapour and rises to the condenser top of the pipe. The condenser is plugged in to a manifold and water from the geyser flows through a manifold and absorbs the heat. The fluid in the heat pipe condenses and flows back down the tube. This process continues, during all weather conditions.

ITS solar systems offer:

  • Sleek low profile design
  • Beautiful finish
  • Superior corrosion resistance
  • Thick hail resistant glass
  • Maintenance free operation
  • Freeze resistant

Back up heating element

Solar water heating systems almost always require a backup system (element) for cloudy days and times of increased demand. Conventional storage water heaters usually provide backup and may already be part of the solar system package.

Heat pumps and solar water heaters can be retrofitted to work with an existing conventional storage water heater (geyser).

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