42/23-55 EN Rev. 1 SCC-C Sample Gas Cooler Operator’s Manual 25
Description
Principle The SCC-C sample gas cooler contains 1 or 2 heat exchangers in which the
sample gas is cooled down to around +3 °C.
Refrigerant Circuit
(see Fig. 8)
Depending on the operating conditions, the refrigerant compressor 1 compresses
the vaporous refrigerant from suction pressure of around 100 kPa (= 1.0 bar) to
800–1700 kPa (= 8–17 bar).
In the downstream air-cooled refrigerant condenser 2 the vaporous refrigerant is
condensed by means of cooling. The liquid refrigerant flows through the
refrigerant drier 3 to the capillary pipe 4.
In the capillary tube 4 the pressure of the liquid refrigerant is reduced from its
condensation pressure 800–1700 kPa (= 8–17 bar) to a lower pressure
(evaporation pressure) 100 kPa (= 1.0 bar), and the refrigerant passes into the
evaporator 6.
In the heat exchanger 5, which is inset in a hole in the cooling block 7, energy is
extracted from the sample gas; the sample gas is cooled, and the energy is fed
into the vaporous refrigerant at an evaporation pressure of 100 kPa (= 1.0 bar,
approx. –10 °C). The vaporous refrigerant is sucked in once more by the
refrigerant compressor 1.
In order to keep the sample gas outlet temperature (dew point) constant, the
refrigerant mass flow is regulated by the temperature-controlled valve 8 in the
bypass of the refrigerant compressor 1 in accordance with the output required.
The valve is open when no cooling is required.
Fig. 8
Refrigerant Circuit
°C
2
3
4
5
6
7
1
8
9
1 Refrigerant Compressor
2 Refrigerant Condenser
3 Refrigerant Drier
4 Capillary Tube
5 Heat Exchanger
6 Evaporator
7 Cooling Block
8 Valve
9 Temperature Controller
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