BJH – Alton Memorial Hospital Retro-Commissioning

Alton, Illinois

Health Care
  • Year Completed: 
  • Project Team: 
    • Eric Utterson, Principal
    • Ryan Corrigan, Project Engineer

Alton Memorial Hospital consists of six main structures connected together that make up the main hospital building. The gross area of the hospital is 454,000 sq. ft.

8760 Engineering was hired as the Retro-Commissioning service provider to identify no-cost/low-cost energy saving measures in compliance with the Ameren Illinois Act On Energy Program.

Through data trending we were able to determine how systems actually function, including evaluations of supply air temperature setpoints, whether airside economizers were utilized, proper or failed control valve function, etc. This data, combined with the operational characteristics of the HVAC systems, permitted the simulation of the base energy use in kWh or electricity, pounds of steam, ton-hours of chilled water, and therms of natural gas.

8760 prepared:

  • Energy and financial parameters
  • Modeling for air handling units
  • Modeling for chilled water system
  • Energy modeling verification

As part of the retro-commissioning analysis, energy conservation measures (ECMs) that were noted generally landed in one of the following groups:

  • Sequence of Control Adjustments
  • Scheduling Changes
  • Equipment Malfunction
  • Equipment Improvement
  • Chilled Water System Modifications
  • Space Pressurization Control

As a result of this project, 8760 was able to reduce the annual energy consumption of the hospital by 2,300,000 kWh and 303,000 therms. The total project cost was just over $150,000 and helped the hospital qualify for Ameren incentives.