Solar Installers | Solar PV | Solar Thermal
Solar Thermal systems - Solar thermal panels for home use - Either evacuated tubes or flat plate systems, provide hot water to either an existing or more typically a hot water cylinder with an additional solar coil Many manufacturers are on the market, and they are now becoming widely available from trade plumber merchants, as well as specialist solar panel suppliers and direct sales organisations. There are two main types of systems, flat plate and evacuate Both solar thermal systems absorb energy from the sun in their collectors, and this is transferred via a pump station and a solar control station to a solar cylinder. The principal is that whenever there is a temperature differential between the collectors and the bottom of the cylinder, then the pump starts and transfers this energy into the cylinder. A well designed solar thermal system (evacuated tubes or flat plate), will be able to provide up to 70% of the annual hot water requirement of a household. The system monitors the temperature in your water tank and typically, when it is lower than that of the panel on your roof the water is pumped out of the roof panel through a heating coil in your hot water tank (the heat exchanger). This, in turn, heats the water in your storage tank. When the weather is cold and or it is dull outside, the pumps remains switched off leaving the your storage tank to be heated by your conventional immersion heater or boiler. The flat panel collector is the most popular system in the UK, with early examples installed over 25 years ago. Many manufacturers are on the market, and they are now becoming widely available from trade plumber merchants, as well as specialist solar panel suppliers and direct sales organisations. A typical solar thermal flat plate collector consists of a special solar glass ,a copper tube which can either snake around the panel or use a manifold top and bottom with tubes between them, a metal backing plate which has an energy absorbing paint applied, and an insulated backing. Sunlight passed through the solar glass and is trapped inside the panel. Energy is absorbed by the copper The typical components of any flat panel system comprise the solar panel or panels - often called the collectors, a pump, a pressure vessel, a solar control station and a solar cylinder.
Solar Installers - PV Solar - Solar Thermal Solar Thermal - Evacuated Tubes Solar thermal of the evacuated tube type, consists of a doubled walled glass tube, rather like a thermos flask, with a vacuum in the space between the walls. The inner tube has a special dark coating on it. The solar energy passes How solar thermal-evacuated tubes actually work: As the sun warms the tube, the liquid situated in the heat pipe evaporates (turns into a gas) and the heat rises to the top. The top end of the heat pipe This extracts the heat and causes the gas to condense and return down the heat pipe and the cycle recommences. The phase changes (liquid to gas and vice versa) actually enhance the efficiency of the heat transfer considerably. A number of tubes are fitted to a manifold, and a number of manifolds can be joined together to provide the expected energy requirements of the installation.
Thermal stores are a clever way of eliminating the need for a cold water storage tank and providing mains pressure hot water. An accumulator is basically a large heat store. Sized from 500l to anything up to 5000 litres or more they are used to absorb and store energy for later use. They can be put underground or in outside storage but of course need high levels of insulation in order to retain the energy created. One application for the use of an accumulator is to reduce peak energy requirements from an incoming energy source. Wood / pellet burning stoves, and ground source heat pumps can benefit from the use of these. Another application is for use as a buffer vessel for a swimming pool. By storing heat using the solar pump, it can be transferred to the pool when the pool pump is in filtration mode. The benefit of such a system lies in the fact that if the pool pump is always used to extract the energy, it can result in more than necessary use of the pool pump. Solar Installers - PV Solar - Solar Thermal |
tube which usually contains a solution of ethylene glycol. The copper pipe becomes hot and a pump station takes the heat and passes it through a solar coil in a special solar cylinder where it heats up the water in the cylinder. The cooled ethylene glycol mixture returns to the panel and the cycle repeats itself.
through the vacuum as radiation, and the energy is absorbed by the coating on the inner tube. This causes the temperature inside the inner tube to increase. Inside the tube there is a copper tube which itself has a vacuum in it, together with a small quantity of a fluid which because of the vacuum, boils at a low temperature. 
is fitted in a special manifold and is completely surrounded by water. 