Профессиональное развитие будущих инженеров-строителей средствами иностранного языка: Лексический практикум по английскому языку. Трубникова Н.В. - 46 стр.

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may be a lower percentage of the total. Electric, gas and coal appliances pro-

duce large amounts of convection and are partly convectors. Types of radiator

are as follows:

Hot water: single, double or triple panel, column, skirting heaters, recessed

panels, banks of pipes.

Electricity: off-peak storage heaters, radiant appliances convectors radiant ceil-

ing systems.

Gas, coal and oil: radiant appliances.

The main characteristics of these appliances are as follows:

Steel single panels: neat appearance, high heat output per square metre of sur-

face area, easy to clean, narrow.

Steel double panels: greater heat output per square metre of wall area used, dif-

ficult to clean, protrude into the room, more costly.

Cast iron panels: heavy and more obtrusive, low heat output, very long service

period.

Steel and cast iron columns: high heat output per square metre of wall area

used, bulky, heavy, often mounted on feet, difficult to clean except the hospital

pattern which are smooth finished.

Radiant panels: flat cast iron or steel plates with water pipes bonded to their

back. They are often mounted at high level in industrial workshops and require

a large surface area.

Banks of pipes: bare steel or copper pipes fitted at skirting level in

rooms or storage areas to provide an inexpensive heating surface.

Off-peak storage: thermal storage heaters taking electricity at night dur-

ing less expensive charging periods. The heat is stored at high temperature in

cast iron or refractory bricks in an insulated casing. Heat is released continu-

ously into the building unless the heater is fitted with a thermostatically con-

trolled fan and a time switch that determines its operating period. The only

other control is over the length of the charge period; this requires estimating the

following day's weather pattern. Heaters are bulky and their weight requires at-

tention to the floor structure to ensure sufficient strength.