Product manual

Emerson ZX platform – scroll superiority
Scroll compressors deliver flatter capacity compared to reciprocating compressor condensing units due to the high volumetric efficiency of
scroll compressors.
Flatter capacity can be otherwise described as lower change in capacity with change in outdoor ambient. This is schematically shown in
figure 03. Flatter capacity brings certain inherent advantages, which highly benefit users, trade and stored products.
Some of the benefits of flatter capacity on ZX platform CDUs are described below.
1. Smaller unit selection: Condensing units are selected to match the required refrigeration capacity at the highest required ambient.
Flatter capacity allows a smaller unit selection compared to reciprocating compressor CDU.
2. Lower operating cost: At lower ambient conditions, ZX platform CDU delivers capacity closer to the cooling load. In contrast
reciprocating compressor CDU delivers capacity in far excess of what is required. This helps the ZX platform CDU to operate at relatively
higher evaporating temperature. Higher evaporating temperatures improve the compressor efficiency. In addition higher evaporating
temperature reduces the rate of ice formation on the evaporator coils /frost build up. Lower frost build-up improves the evaporator heat
exchange efficiency. It also reduces the defrost heat demand, thereby resulting in lowering energy needed for defrost.
3. Freshness of food: Another benefit of higher evaporating temperature is reduced dehumidification by the evaporator coil. This allows
higher relative humidity in the cold room or cold cases. Higher relative humidity reduce the weight shrinkage and improves freshness of
stored product.
3
Emerson ZX Platform Condensing Unit
PRODUCT MANUAL
Low Ambient High Ambient
Higher
Evaporating Temp
ZX Capacity
Reciprocating Capacity
Allows
Smaller Unit
Figure 03