山东建筑大学 热能与动力工程专业英语考试

Boiler: boiler use heat to convert water into steam for a variety of applications.

Steam turbine: steam turbine is one of the most important power generating turbo-machines. it is the principal prime mover in the field of electric power generation.

The degree of reaction：the degree of reaction of a turbo-machine stage is defined as the ratio of the static or pressure head change occuring in the rotor to the total change across the stage

Economizers: the economizer is a counter flow heat exchange for recovering energy from the flue gas beyong the superheater and if used the reheater . it increases the temperature of the water entering the steam drum .

Air heaters : the air heater utilise the heat in the boiler flue gases leaving the economiser to heat the combustion air and provide hot air for drying coal.

Isolated system : the system does not exchange energy with the surroundings. it is an isolated system .

Opening system : systems exchange have material exchange with the environment both energy.

Closed system : olny the energy with the outside world there is no material exchange system .

The first law of thermodynamic : the net heat transfer is equal to the net work done for a system undergoing a cycle

The second law of thermodynamic : it states that it is impossible to construct a refrigerator that transfers energy from a cooler body to a hotter booly without the input of work .