Terminology

Terminology

Here you can find all of the terms used in the air-conditioning sector.

A device which pressurises gas in the heat pump cycle. 

Equipment which transfers solar energy to water within a heating system.

An appliance in a heating system which provides energy for the system by burning fuel. It transfers energy to the water circulating in the system by means of an heat exchanger in the appliance.

Type of boiler which can only utilise the lower calorific value of gas. A main principle in the design of a conventional boiler is to prevent condensation on the heat exchanger. If condensation occurs, it damages the heat exchanger.

This is a method of management of the boiler’s output on the basis of outdoor air temperature.

They convert solar energy into heat energy. These systems comprise a solar energy collector, a storage cylinder and a control unit.

This is a system which converts sunlight falling on its solar energy collectors into heat energy.

In addition to the energy obtained from combustion of the gas, it also uses the energy derived from condensation of the water vapour within the flue gas. When calculating the efficiency of a conventional boiler, this value is not included, and therefore the efficiency value of a condensing boiler can be as high as 110%.

These appliances convert electrical energy into heat energy.

These appliances absorb energy from low-temperature energy sources and transfer it in a high-temperature form in which it can be used

These are appliances designed to produce domestic hot water. In these devices, hot water is not stored. Instead water is heated as it flows upon demand.

Energy sources such as wood, sun, wind and the sea.

In evacuated tube collectors, the absorber is held within inner of two glass tubes positioned one inside the other. The air between the two tubes is evacuated, minimising heat loss.

Primary energy sources are natural energy sources such as coal, natural gas, solar energy or uranium.

This device, manufactured from steel or copper, provides transfer of heat between two fluids without letting them mix or come into contact.

Used in devices with sealed combustion air. These appliances are equipped with a fan. While the waste gas is removed from the flue, fresh air is also drawn through a coaxial flue into the combustion chamber.

Device which controls the output of the boiler on the basis of room temperature.

This device provides transfer of heat between two fluids without allowing them to mix or come into contact.

The temperature of the water when it leaves the heating device. 

The temperature of the water when it returns to the heating device. 

Fluid used for the transfer of thermal energy. Pure water is used in heating systems. 

Removes the waste gas from the system. May be natural draught or forced draught. 

Domestic hot water

Element of the heating system which provides transfer of the heat produced to the living space. 

Vessel used in order to compensate for the expansion of water within the system when heated. Expansion vessels of 5-8 L are normally used in wall-mounted appliances. 

In order to exploit the heat energy available in the ground, plastic pipes are looped down into holes bored into the soil to a depth of up to 100 m, and then covered in. The ground source energy is gathered using water circulating in the pipes. 

A two-cable control which notifies the boiler whether, on the basis of the set room temperature, it should ignite. 

Combustion chamber which draws its combustion air from the outside. The waste gas is expelled forcibly to the outside environment by means of a fan. 

Combustion chamber which draws its combustion air from the space in which the appliance is located. At the same time, waste gas is removed from the system by natural draught through a vertical flue.

Using latent heat within flue gas by condensing the water vapour within it. 

Flue gases are produced by the combustion of fuel (gas, solid fuel etc.). Their structure varies depending on the type of fuel. They mainly consist of water vapour and CO₂. The flue gas produced as a consequence of the combustion is expelled to the outside environment by means of the flue. 

Materials which ensure that heat generated is transferred without loss to its destination. 

The heated water is sent to the system or to the heat exchanger or cylinder to produce domestic hot water. 

Pump fitted to a combi boiler. It is fitted to provide water circulation for the heating circuit.