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Suction/liquid heat exchanger

The cooling effect evaporator is proportional to the length of the line between points 1 and 2 " pressure-enthalpy diagram in Fig. 3. Cooling capacity is increased by reducing the temperature of the liquid at the inlet of the expansion device (i.e. increase in liquid subcooling).

The refrigerant temperature at the outlet of evaporator below, than in the liquid inside extend the device. Thus, one can reduce the temperature of the liquid heat exchanger between these two points (between 2 and 7 in Fig. 3 and 4).

There will be a corresponding increase in suction temperature of the steam entering the compressor. This will reduce the capacity of the compressor steam is less dense and therefore less refrigerant is pumped. In General, the benefits outweigh the losses at boiling temperatures above -15C.

Be careful when using these heat exchangers in systems with refrigerants R22 and R717 (ammonia), where the increased suction temperature may result in conditions of high discharge temperatures of the compressor...

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