The 90 by 90 Industrial Operations & Maintenance Program provides free technical assistance to identify and analyze low-cost O&M efficiency measures at your site. The “90 by 90” element is an incentive structure to encourage companies to get moving right away on their energy saving system improvements. Best of all, the program can pay for 90% of the cost for repairing and optimizing your system performance, along with major yearly energy savings added to your bottom line!

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HOW IT WORKS:  A comprehensive system audit and performance evaluation will be performed on your system to identify maintenance issues, control optimization, and other energy-wasting issues. A formal Energy Trust Proposal is then prepared to address all approved O&M issues identified for your system.

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The 90x90 Deal:  Complete your project within 90 days of the custom incentive offer and your cash incentive will be 90 percent of the cost for the maintenance and system overhaul and optimization, rebated through guaranteed energy cost rebates and managed by Energy Trust of Oregon.

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Once completed, savings from industrial refrigeration O&M typically (and immediately) reduces site energy use by 2 to 10 percent, with little or no upfront expense. 90x90 projects are usually mostly labor-based in nature and might typically include: calibration, setpoint optimization to control system, rebuild opportunities, condenser and evaporator cleaning, operational optimization, etc.

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A typical project helps our partners to increase the operational efficiency of compressed air, refrigeration, fans, pumps, and other systems through additional O&M measures such as:

• Eliminating leaks

• Scheduling of equipment

• Tuning and optimization of controls

• Reducing and consolidating loads

• Adapting improperly sized equipment

• Recalibrating or replacing Temperature & RH sensors

• Rebalancing exhaust

 

Setpoint changes in control system may include:

• Raising suction pressure

• Reducing condensing pressure

• Reducing VFD speeds

• Evaporator fan cycling

• Seasonal tuning (e.g. defrost schedules)

• HEV adjustment

• Tuning compressor slide valves

• Optimize defrost control –bump, duration, runtime, grouping

• Optimal compressor sequencing

• Optimal condenser approach temperature (example provided)

 

PermaCold / Energy Trust Case Studies

Energy Trust Cash Incentives paid for 90% of the projects below!

 

Food Distribution Center

Working with a cold-storage client, just a few of the facility-specific issues identified and fixed by PermaCold included:

• VFD Compressor had failed, fixed speed unit was running in its place.

• Suction pressure was reduced to prevent short cycling of fixed speed compressor.

• Outdoor weather sensors were exposed to direct sunlight causing them to report elevated wet bulb and dry bulb temperatures.

• Dock Evaporators set to fixed 90% fan speed.

• Annual Recurring Energy Cost Savings: $33,773

 

Food Industry Partner

At another facility, we worked with our client to identify a number of facility-specific issues which included:

• Their dock evaporators had undersized orifice plates that limited the minimum condensing pressure setpoint.

• Upsizing the orifice plates allowed operation at a lower minimum condensing pressure setpoint.

• Reduced the dock evaporator fan minimum speed setpoint and allowed the units to modulate based on zone temperature.

• Lowered the under-floor circulation pump speed to save pump energy.

• Additionally, the lower flow rate reduced the underfloor heat load applied to the refrigerated freezer space.

• Annual Recurring Energy Cost Savings: $16,863

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