The ultimate performer in energy efficiency
Star Cool and its long time compressor supplier Bitzer uses
energy efficient and reliable Compressor with a reduction of the
energy consumption by up to 30% compared to conventional
technology. This goes hand in hand with Star Cool's objectives to
lead the reefer business in energy efficiency.
Advantages:
• Higher Efficiency: The 2-stage compressor can be used with an
economiser sub-cooling circuit. By doing so, the capacity can be
increased by up to 30 per cent at the low operating point.
• Higher Cooling Capacity: The volumetric efficiency is more than
twice the value of a single stage compressor. In other words, less
than half the displacement of the compressor is necessary.
The 2-stage compressor with sub-cooling is ideal for speed
variation. The benefits of the above features combined with the
digital expansion valve and the 2-speed condenser fans are
overwhelming: A reduction of the energy consumption of up to 30 per
cent compared to conventional technology. Complementing the
refrigerant consideration on the environmental impact, the
compressor is fully repairable, i.e. it is possible to repair the
cylinder liners, bearing, drive parts, and motor. The use of
seawater resistant aluminium does not only offer a decisive weight
advantage, it avoids any use of paint, making the compressor
corrosion free (by nature of its material).
The Bitzer-Star Cool design offers the best reliability potential
for reefer container applications. The compressor runs with low
piston speeds (even at maximum compressor running frequency), and
the low relative speeds in all drive parts allow for practically
wear free operation. In addition, the reed valve design ensures
minimum moved masses resulting in minimal failure risk even at
critical operating conditions. This is proven in millions of
compressor applications worldwide.
Furthermore, thanks to the economizer circuit, the temperature
after the first compressor stage can be reduced by injecting the
relatively cool economizer gas. The resulting temperature level of
the complete compressor is reduced, especially in low temperature
operation. Due to the intermediate stage cooling and the high
efficiency, the low thermal load of the 2-stage design enhances the
durability of the compressor while improving the overall system
performance. Finally, the suction gas cooling of the frequency
converter power electronics ensures an optimal cooling of the
electrical components.
In a nutshell, the fundamental approach of eco-efficiency can be
put as follows: "Create more value with less impact". BITZER-Star
Cool and their partners successfully and innovatively managed to
implement these principles on the variable speed drive, aluminium
2-stage R134a compressor, while ensuring an irreproachable quality
and reliability. This compressor, with its features and
technologies, generated a breakthrough in the reefer industry and
already encompasses the requirements for the next low GWP
refrigerant step.
