Gas central heating

Central heating

Exercise 3. Використовуючи подану схему, спробуйте пояснити функції всіх компонентів центрального опалення

Hot

How can you heat a house in cold weather?

Central heating

Центральне опалення

Exercise 1. Дайте відповідь на запитання:

Exercise 2. Підберіть антоніми до поданих слів:

cold water-

water out -

flue -

boiler thermostat control-

gas supply -

burner –

Diagrams are also very useful in helping the reader to make the right guesses about what a text will contain. Before you read a text, read the title and look at any diagrams it contains. Using the diagram, try to explain the function of these components:

1. the pilot light

2. the heat exchanger fins

3. the flue

4. the thermostat

5. the pump

Exercise 4. Прочитайте та перекладіть текст:

Most gas central heating works-on the 'wet' system of heat transfer between water flowing through pipes. A typical system includes a boiler, a network of pipes, a feed, and expansion tank, radiators, and a hot water storage system.

In conventional boilers, water is heated by gas burners. It is then pumped around the central heating system and the hot water storage cylinder. The flow of gas to the burner is controlled by a valve (or valves) which can be operated by a time switch or by a boiler thermostat, hot water cylinder thermostat, or by a thermostat located in one of the rooms. Air is necessary for complete combustion and is supplied to the burners either from inside the house; when adequate ventilation must be ensured, or directly from outside through a balanced flue.

Water is circulated through a heat exchanger above the burner. The heat exchanger is made of tubes of cast iron or copper, which resist corrosion. Both types use fins to increase the surface area in contact with water, which improves the transfer of heat. A thermostat located in the boiler causes the gas control valve to shut off when the water temperature reaches the pre-set level.

After being pumped through a diverter or priority valve, water circulates around either one of two loops of pipework, which act as heat exchangers. One loop passes through the inside of the hot water storage cylinder in a coil arrangement. The loop then returns to the boiler for re-heating.

Дата добавления: 2015-06-26