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SOLAR HEATING DESCRIPTION

1) Why solar heating

Solar water heating systems provide access to one of the most readily available yet under-utilized energy resources in existence–the sun. Unlike other types of energy–oil, natural gas–you don’t have to pay to use the sun. A relatively small one-time investment in a solar heater allows you to harness this vast reservoir hot water and enjoy significant annual savings on your energy bill.

2) Efficient solar system

At the heart of a solar thermal system is the solar collector. It absorbs solar radiation, converts it into heat, and transfers useful heat to the solar system. Solar system should respect the following principles in order to produce efficient energy :

  1.      – South installation in Lebanon
  2.      – Suitable inclination (between 35 and 45° in Lebanon)
  3.      – Avoid shading
  4.      – Number of panels suitable for hot water consumption volume
  5.      – Storage water tank should be very well insulated
  6.      – Hot water pipes should be very well insulated
  7.      – Domestic hot water recirculation inside the house (if applicable) should be controlled to minimize heat losses.

3) How to size your solar system

Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don’t. Most solar water heaters require a well-insulated storage tank. Solar storage tanks have an additional outlet and inlet connected to and from the collector.

A properly sized system will provide almost all of a home’s hot water in the summer months, and partially hot water demand in winter season. To determine the storage tank size you need to consider how much water is needed for your household. On residential applications, an average person uses 50 liters of water per day. Take into consideration how many people are in your household and you can determine the size of the water storage tank.

Example: 4 persons x 50 liters per person = 200 liters tank

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