Solar Thermal Water Heating

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What is Solar Thermal Water Heating?

A solar thermal system works by harnessing is the sun's energy and converting it into heat which is then transferred into your home or businesses heating system as hot water or space heating. Solar thermal panels are used in conjunction with a boiler, collector or immersion heater.

How does is work?

Solar water heating systems use solar panels, called collectors, fitted to your roof. These collect heat from the sun and use it to heat up water which is stored in a hot water cylinder. A boiler or immersion heater can be used as a back-up to heat the water further to reach the temperature you want.

What type of systems are there?

Open-loop systems are both simple and economical. They are best suited for warm regions, because they operate with potable water only. Hot water from the collector mixes with the supply water in the storage tank, so a single freeze could destroy the system.

Open-loop systems are not recommended in extreme hard-water areas, since scale buildup in the collectors is likely to hinder their operation.

Closed-loop systems prevent freezing and scale buildup. Heated anti-freeze solution from the collector flows into the tank’s heat-exchanger and then returns to the collector.

An electric backup makes up the energy deficiency during periods of cloudy weather.

Forced Circulation Systems

Forced circulation systems use electrical pumps, valves, and controllers to circulate water or other heat-transfer fluids through the collectors. This enables a high degree of flexibility in the positioning of the system components. For example, the tank can be installed in a basement. In addition to this, the system can operate with a series of collectors to supply heated water to several large tanks – making it suitable for hotels, swimming pools, and other commercial applications.


Closed-Loop System

In a closed-loop system, heat transfer fluid circulates through the system tubes and doesn’t mix with the potable water inside the water storage tank. Closed-loop systems are better-suited for colder climates, since the anti-freeze solution keeps the system from freezing. The system’s life span is lengthened by preventing scale buildup inside the collector tubes. Closed-loop systems can be operated in either Forced Circulation or Thermosiphon systems.

Central Installations

Chromagen’s central installations for home and commercial use provide heated water in very large quantities by using an array of collectors. The number and size varies according to the water heating requirements. These installations are the perfect solution for apartment buildings, hotels, hospitals, and industrial plants. They are generally backed up by conventional energy sources. Central installations can be operated with large storage tanks of over 1000 liters or with small individual storage tanks for each consumption unit.

Chromagen has vast experience in the design and implementation of large solar installations. Installations of this type require site specific designs. Not only are these applications resourceful and energy saving, they also contribute to a healthy environment by preventing air pollution.