a practice before going to sit IELTS
A central heating system in a house works is presented in the diagram.
Cold water flows into the house, moves to the boilers and becomes hot;
hot water goes to radiators, release heat and cools down. The pipelines
are the passages of water and two other main components of
the system are the boiler and the hot water radiators. Other devices are
provided to maintain a steady flow in the system.
Observing the exchage of heat can show us a clear picture of the system.
Boiler is the source of heat which needs fuels like gas or oil. After water
is heated up, it moves to hot water radiators. Heat is expected to
exchange at radiators so the house becomes warmer and water colder. Cold
water then is pumped back to the boiler and reheated and redeliever to
radiators.
In addition to heat exchange, maintaining a steady water flow is a important
task in the system. The water tank and storage tank are connected and
excessive water will flow to taps.
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OK, how come you become a prolific writer now? 我自首，我是為了達到200篇。
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