TITLE.PM5

12 ENGINEERING THERMODYNAMICS

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Condenser (wire-tube type)

High pressure gas

Compre-

Discharge line ssor

Suction line

Filter

Expansion device

(Capillary tube)

High pressure

liquid

Low pressure gas Accumulator

Evaporator

Low pressure

liquid

Sound deadner

Fig. 1.9. Domestic refrigerator.

— The high pressure liquid refrigerant then flows through the filter and then enters the

capillary tube (expansion device). The capillary tube is attached to the suction line as

shown in Fig. 1.9. The warm refrigerant passing through the capillary tube gives some

of its heat to cold suction line vapour. This increases the heat absorbing quality of the

liquid refrigerant slightly and increases the superheat of vapour entering the compressor.

The capillary tube expands the liquid refrigerant at high pressure to the liquid refrigerant

at low pressure so that a measured quantity of liquid refrigerant is passed into the evaporator.

— In the evaporator the liquid refrigerant gets evaporated by absorbing heat from the

container/articles placed in the evaporative chamber and is sucked back into the com-

pressor and the cycle is repeated.

Highlights

1. The layout of a modern steam power plant comprises of the following four circuits :
   (i) Coal and ash circuit
   (ii) Air and gas circuit
   (iii) Feed water and steam flow circuit
   (iv) Cooling water circuit.


2. Any type of engine or machine which derives heat energy from the combustion of fuel or any other source
   and converts this energy into mechanical work is termed as a heat engine.


3. The major fields of application of gas turbines are :
   (i) Aviation (ii) Power generation
   (iii) Oil and gas industry and (iv) Marine propulsion.


4. A simple gas turbine plant consists of the following :
   — Turbine
   — Compressor