Sequencer Installation

The system demand in a compressed air system is determined by the sum of average demand of different users. Plants with wide variations in air demand need a system that can meet the peak demand requirements while also operating efficiently under part-load. While oversized compressors are sometimes installed to assure meeting the peak demand conditions, installation of multiple compressors with smaller and/or varying sizes can offer a more efficient solution. However, multiple compressors bring along their own control challenges. Cascade pressure control that is traditionally used to control systems with multiple compressors does not necessarily offer optimal system operation.

Electronic sequential controllers, which control multiple compressors around a single set pressure match the compressors to the system demand as closely as possible and therefore offer a more efficient operation.

Development Status Products
Commercial

Sequencer InstallationCosts & Benefits

Parent Process: Compressed Air Systems
Energy Savings Potential

This measure is estimated to offer following improvement potentials:
• 15% for low efficiency base cases;
• 8% for medium efficiency base cases;
• 2% for high efficiency base cases.

Electrical and primary energy savings potential of this technology for diffierent countries is estimated as following (UNIDO, 2010): 

  Final (GWh/y) Primary (TJ/y)
US 2825 31009
Canada 745 9287
EU 2684 25217
Thailand 562 5647
Vietnam 213 3048
brazil 866 9667
CO2 Emission Reduction Potential

Total emisson reduction potential, as kt CO2/y for different countries are estimated as (UNIDO, 2010): 

US 1702
Canada 371
EU 1170
Thailand 291
Vietnam 104
brazil 127

Costs

Estimated typical capital costs of this measure for different system sizes (S) are:
• US $0  for S < 37 kW;
• US $5000 for 37 kW < S < 75 kW;
• US $7500 for 75 kW < S < 150 kW;
• US $15000 for 150 kW < S < 375 kW;
• US $20000 for 375 kW < S < 745 kW; (UNIDO, 2010)

Cost of conserved energy, expressed as US $/MWh-saved, in different countries are estimated as following: (UNIDO, 2010)

US 35.3
Canada 36.0
EU 31.7
Thailand 13.2
Vietnam 15.0
brazil 15.6

Parent Process:
Energy Savings Potential
CO2 Emission Reduction Potential

N/A

Costs

Sequencer Installation Publications

Page Number: 

52-63

Page Number: 

19