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

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at a pre-set

temperature

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. 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

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.

Initially

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, cold

water

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is taken from the local

water

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

water

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,

this

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fluid is

then

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

temperature

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between the running fluid and the air inside the house.

Finally

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,

water

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reaches back to the boiler. The amount of

water

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taken from the utility service has a specific volume

according to

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an engineering design,

this

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stage continually repeats until the

water

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gets a predefined

temperature

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. Once the system has reached the pre-set

temperature

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,

that is

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

water

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

water

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

water

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deviates towards a spare

water

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tank which functions as a

water

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reserve for when the service is interrupted.