The diagram below shows how a central heating system in a house works. You should spend about 20 minutes on this task. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The given picture illustrates how a central heating system operates in a typical house in order to keep the internal climate and tap

water

at a pre-set

temperature

. The process runs through two stages, starting at a transitory state until reaching a steady state. In the transitory stage, the main goal is to fill the heater´s piping circuit with

water

.

Initially

, cold

water

is taken from the local

water

utility supplier and passed through a boiler, which is a device designed to exchange energy between burned fuel (gas or oil) and

water

,

this

fluid is

then

pumped through some tubes and radiators, which are equipment used for exchanging

temperature

between the running fluid and the air inside the house.

Finally

,

water

reaches back to the boiler. The amount of

water

taken from the utility service has a specific volume

according to

an engineering design,

this

stage continually repeats until the

water

gets a predefined

temperature

. Once the system has reached the pre-set

temperature

,

that is

when it gets to a steady state, thanks to the high pressure on the piping circuit,

water

is transported to a storage tank from the boiler, after the storage tank is completed,

water

runs down to a sink and when the pressure again is high enough,

water

deviates towards a spare

water

tank which functions as a

water

reserve for when the service is interrupted.