6 Sources of Central Cooling Savings

03/20/2013 | By Janelle Penny

Cut costs and increase efficiency with ENERGY STAR’s upgrade tips

Buying green-certified cooling equipment can be a smart move, but it’s not the whole story. For the best performance, root out additional savings from pumps, fans, and operational practices.

Try these tips from ENERGY STAR to get you started.

1) Consider Capacity

Review the capacity of all chillers, then turn them on or off as needed to keep each one in its most efficient zone. If you have a chilled water plant with excess capacity, consider running condenser water over as many towers as possible, as often as possible, at the lowest speed you can. However, this can cause extra fan cycling, which adds wear to motors and gears.

2) Watch Outdoor Factors
Monitor the conditions outdoors and reset chilled and condenser water temperatures accordingly. The condenser strategy in particular requires adjustment because higher temperatures decrease the power needed for the cooling tower fan, making that look like a source of savings. However, the chiller’s power needs increase. ENERGY STAR’s Building Upgrade Manual notes that “the optimum operating temperature occurs at the point where these two opposing trends combine to produce the lowest total power use.”

3) Keep Up with Cleaning
Scale, algae, and slime can be problematic in many parts of the cooling system and can decrease its efficiency and capacity. Automatic cleaning equipment is available for condensers, while cooling towers may benefit from chemical treatments, ozone generators, and/or ultraviolet irradiation, ENERGY STAR notes.

4) Reduce Resistance
Replace standard valves with low-friction units that can reduce flow resistance for chilled water. This step will reduce pump energy use and return less heat to the chiller.

5) Match Speed to Need
Variable-speed drives help maintain efficiency in pumps and systems where valves control flow by inducing a drop in pressure. If you don’t have sophisticated controls to pair with them, lower chilled-water rates enabled by variable-speed pumps can be coordinated with resetting the chilled water temperature, allowing you to meet loads efficiently.

You can also use the drives in centrifugal compressors, where they’ll let the chiller run at lower speeds under part-load conditions and use less power than a centrifugal chiller with inlet vanes.

6) Higher Efficiency, Lower Energy
Standard or oversized pumps can be replaced with more efficient units after you’ve reduced loads. Most induction motors that drive pumps reach peak efficiency at about 75%.

Hungry for more savings? Check out ENERGY STAR’s free Building Upgrade Manual at www.energystar.gov.

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Surpass State Energy Requirements with Dual-Cooling Data Center CRAC Technology

See how professionals like you are taking advantage of the highest performing precision cooling system for their computer rooms and data centers, and why Data Aire is fast-becoming the number one choice for facility managers and building owners looking to decrease their energy consumption. 

Data Aire understands how digital technology and data gravity is rapidly impacting and transforming businesses. That’s why they developed ultra-efficient cooling technology to support the most modern (and not-so-modern) data centers.  Learn how One Wilshire in Los Angeles, one of the most advanced carrier hotels today, is surpassing California's strict energy efficiency requirements with Data Aire’s purpose-built system, which provide full-economization for 260 days – almost 72% of the year. That’s a measurable savings! Furthermore, the projected PUE on an annual basis for a full load is at or below 1.2.

Connectrac® wireways are the new standard for bringing power & communications cable management to all interior applications. Free yourself from core drilling!

Surpass State Energy Requirements with Dual-Cooling Data Center CRAC Technology

See how professionals like you are taking advantage of the highest performing precision cooling system for their computer rooms and data centers, and why Data Aire is fast-becoming the number one choice for facility managers and building owners looking to decrease their energy consumption. 

Data Aire understands how digital technology and data gravity is rapidly impacting and transforming businesses. That’s why they developed ultra-efficient cooling technology to support the most modern (and not-so-modern) data centers.  Learn how One Wilshire in Los Angeles, one of the most advanced carrier hotels today, is surpassing California's strict energy efficiency requirements with Data Aire’s purpose-built system, which provide full-economization for 260 days – almost 72% of the year. That’s a measurable savings! Furthermore, the projected PUE on an annual basis for a full load is at or below 1.2.


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