Single compressor installations

Single compressor installation

When examining the SER of a 30 kW fixed speed compressor, it is important to differentiate between the Theoretical SER and the Total SER. The Theoretical SER typically presents a single figure in technical documentation, leading to the perception of a linear SER graph (or even a dot).

However, due to factors such as load/unload cycles and idle power, the actual SER graph for fixed-speed machines follows a curve.

To assess and compare the performance of our 30 kW fixed speed compressor and our 30 kW variable speed compressor, we conducted a laboratory test. The resulting graph from the study is displayed below. The blue line represents the Total SER of the 30 kW fixed speed compressor, which consistently remains higher than the green line indicating the SER of the 30 kW variable speed compressor.

These findings demonstrate that the VSD compressor, represented by the green line, exhibits a lower Total SER, indicating improved energy efficiency compared to the fixed-speed 30 kW compressor. This highlights the advantage of utilizing VSD technology in compressor rooms to achieve enhanced overall efficiency and reduce energy consumption.

The Total SER or compressor room efficiency is a critical factor to consider when offering new compressors. By prioritizing compressor room efficiency, we can deliver energy-efficient solutions that benefit both customers and the environment.

Single compressor installation

In addition to the significant energy consumption during the unload mode, the lab test also identified other losses contributing to the poorer performance of the fixed-speed 30 kW compressor:

• Y-D startup: 0.052 kWh
• Load/unload cycle: 0.2034 kWh
• Unload/stop cycle: 0.0045 kWh.

It is important to note that while these savings may be lower in comparison, they are still considerable and further contribute to the overall efficiency of VSD compressors.

The comparison between VSD compressors and fixed-speed compressors clearly demonstrates the superiority of VSD technology in terms of energy efficiency and overall performance. More information about benefits and perceptions of VSD you can find in the PERFACTATION document