ECONOMISER
The
economiser circuit (ECO) enhances compressor efficiency by increasing
performance without the need to install a larger compressor.
In practice, the economiser is a heat exchanger installed downline from
the condenser which is used to subcool the condensed liquid.
To achieve this, part of the flow of refrigerant from the condenser enters
the economiser via an expansion device and evaporates upon absorbing heat
from the counterflowing liquid refrigerant (subcooling).
The compressor takes in the heated vapour through a special door located
on its body, midway between the main inlets and outlets.
This solution achieves a significantly higher cooling power thanks to
the additional subcooling of the liquid.
The power draw of the compressor increases less than efficiency because
the overall compression process becomes more efficient, partly due to:
-the increase in suction pressure
-the reduction in temperature due to the main flow being mixed with the
flow from the economiser and consequently decreasing the final compressor
outlet temperature.
The advantages of using the economiser are particularly evident at elevated
condensation temperatures.
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