ULT Technology That Advances Both Energy-Efficiency and System Reliability

Perhaps you’re aware of the free-piston Stirling engine that allows Stirling Ultracold ultra-low temperature (ULT) freezers to use less than a third the energy of legacy, compressor-based models. You may also know that this enabling technology, not only saves energy and associated operating costs, but uses 100% natural refrigerants that substantially reduce ozone-depleting and greenhouse gas emissions. However, you may not realize that the Stirling engine also advances the safety of biological samples with its inherent reliability advantages.

From the outset, Stirling Ultracold has believed that sustainable, energy-efficient ULT technology would present a very compelling choice for the research community, and we are pleased to see the recent efforts of some compressor-based ULT manufacturers to improve the efficiency of their cascade technologies.

However, it should be noted that energy efficiency was never our sole reason for bringing Stirling engine technology to laboratory cold storage. Improvements in ULT efficiency and sustainability, while important on their own merits, should always support or enhance the reliability of cooling systems that preserve valuable samples for research. The inherent reliability of the Stirling engine, while less understood, is vitally needed in our industry to further the safe preservation of biological specimens.

This innovation delivers several reliability advantages that address well-known failures associated with aging technologies used in most ULT freezers. To understand this, let’s first look at the basic differences between cascade-compressor and Stirling engine systems . . .

Unlike “cascade systems” with two compressors and cooling loops in a cascading arrangement, the Stirling engine uses a single reciprocating piston and a continuous, gravity driven thermosiphon to cool the cabinet interior. In contrast to standard cascade systems that regulate temperatures by switching compressors on and off, the Stirling engine’s linear motor system continuously modulates and adapts by controlling the motion of the free piston.

How Does the Stirling Engine Improve ULT System Reliability?
Below are several key design attributes and innovations that extend the operating life of the Stirling engine and address the common reasons why conventional ULT systems fail . . .

  • The advanced integral linear motor system has only two moving parts.
  • The moving parts never wear because gas bearings eliminate physical contact (friction) during motion
  • There is no oil to clog up the system or lubrication levels to maintain.
  • There are no valves to fail or maintain
  • 100% adaptive, continuous modulation regulates temperatures without stop-start cycles.
  • Electromechanical stress and amperage peaks from on-off surge currents have been eliminated.
  • Minimal preventive maintenance is required for reliable cooling operation.

If you would like a more in-depth understanding of how advanced ULT technology can reduce your energy consumption, while also improving reliability and sample safety, talk to your Stirling Ultracold representative or contact us at sales@stirlingultracold.com.

Stirling Ultracold Freezers Now Available on GSA Advantage

SDVOSB & GSA Advantage
Stirling Ultracold products are available on GSA Advantage through, Pulcir, Inc., a CVE VetBiz Certified Disabled Veteran Owned Small Business – Contract GS-07F-0360W

We are excited to announce that all Stirling Ultracold ultra-low temperature (ULT) freezers and accessories are now available for purchase through the U.S. General Services Administration and the GSA Advantage website. Through our distributer Pulcir, Inc., U.S. government agencies may now benefit from the ease and efficiency of the GSA preapproved procurement process when buying our ULT freezer products.

Procurement of Sustainable and Responsible, U.S. Manufactured Products

With the availability of Stirling freezers on the GSA Advantage website, it is now easier for government agencies and research laboratories to support federal sustainability initiatives with the purchase of our energy efficient ULT freezers that use 100% natural refrigerant in place of ozone-depleting HFCs. Because Stirling Ultracold products are made in in Athens, Ohio, the purchase of our ULT freezers supports U.S. manufacturing jobs in a historically underserved Appalachian business zone. In addition, our products are available on GSA Advantage exclusively through our new distributor, Pulcir, Inc., a CVE VetBiz Certified Disabled Veteran Owned Small Business (Contract GS-07F-0360W). At Stirling, our goal is to provide ultra-low temperature freezers to the research community in a way that is socially and environmentally responsible.

Easy Ordering Online

Ordering a Stirling Ultracold ULT freezer or accessory through the GSA Advantage website is quick and easy:

  1. Visit www.gsaadvantage.gov
  2. Type “Stirling Ultracold” within the product search box
  3. Browse our product line of ULT freezers and accessories
  4. Purchase with ease and confidence

For more information about U.S. government agency purchasing of Stirling Ultracold products through GSA Advantage, you can contact Pulcir at 865-272-5338 or send an email message to Nick Pezzuolo at npezzuolo@stirlingultracold.com.

Stirling Users Increasingly Rewarded with Energy Rebates and Incentives

Plug and SparksAs the significant energy savings made possible by Stirling Ultracold freezers are now universally confirmed through independent testing and EPA ENERGY STAR® Final Test Method results, it’s not surprising that several major U.S. electric utility companies are offering rebates to research organizations who adopt our ULT freezers.  Many sustainability-conscious research institutions are also now incentivizing the purchase of our freezers by offering their own internal rebate programs.

Below is the growing list of utilities and research organizations that have implemented ULT energy rebate/incentive programs for buying our freezers so far . . .

  • Duke University
  • Eversource Energy (formerly NStar) rebate for:
    • Harvard University Faculty of Arts & Sciences
  • Pacific Gas and Electric Company rebates for:
    • Bay area commercial biotech and biopharma users
    • University of California San Francisco
  • San Diego Gas and Electric rebate for:
    • University of California San Diego
  • Seattle City Light rebates for:
    • University of Washington
    • Fred Hutchinson Cancer Research Center
  • Stanford University
  • University of California Riverside
  • University of Pennsylvania

It’s quite possible that your research organization could also benefit from a utility or internal energy rebate program for ULT freezer replacement with Stirling Ultracold models.  Contact your utility or Stirling Ultracold representative to help with setting up the rebate process.

The Real Life Cycle Cost of an Ultra-Low Freezer

Did you know that initial purchase price is a relatively small part of the actual cost to own an ultra-low temperature freezer? That’s because the real cost of a ULT is the sum of the purchase price, plus costs for energy, HVAC, floor space and the usual compressor replacement.  With the typical cascade-compressor freezer consuming the equivalent electric power of an average U.S. household, all that energy is rejected as heat in your building, which adds a substantial cost for your HVAC system.

What is your compressor-based ultra-low freezer really costing your organization?
Using manufacturers’ published energy use data at 16c/kWh electric costs, with typical floor space and compressor replacement cost estimates from independent sources, the table on the right estimates cost of ownership percentages per cubic foot of storage per year for a typical compressor-based ULT.

Reduce Total Cost of Ownership by Thinking Strategically

Considering that initial purchase price accounts for less than a third of ULT storage cost, you can see how energy consumption and operating costs have a surprising impact on lowering overall life cycle cost.  Of course, this is counter to the traditional way of thinking about buying freezers.  More research organizations are now looking at that their ULT purchases strategically and replacing traditional models with Stirling Ultracold units.  Using less than half the energy, the SU780UE can typically lower total cost of ownership by about 40%—even with a higher initial purchase price.

In fact, even a free cascade-compressor ULT freezer typically costs more to own than the SU780UE! Watch this video to see how that’s possible . . .

Cooling Performance Integrity Should Not Come with an “Off” Switch

I have good news and bad news.  First, the good news . . .on-off-Switch

With a history of driving up lab utility bills more than their share, it’s good to see compressor-based ultra-low freezer manufacturers aspiring to develop more energy-efficient ULTs.  We applaud this effort and are encouraged to see the lab sustainability imperative gaining a foothold within the research community. In a relatively short time, I believe that Stirling Ultracold has played a positive role in helping to change the industry mindset. By introducing an innovative, energy-efficient cooling technology to the ULT marketplace, we have proven that dramatic sustainability improvements are possible without compromising cooling performance or system reliability.

And now for the bad news . . .

They Want You to Forget that Compromise is Unnecessary

The industry’s move toward energy efficiency has led some to perpetuate the disproven myth that cooling integrity must be compromised to save energy.  In a world that assumes all ultra-low freezers are powered by inherently inefficient compressor technology, this myth actually appears to be true.  However, it’s not true in today’s world, where the Stirling engine is a proven alternative to compressors. That’s why cascade freezer manufacturers would like you to forget that the myth of “necessary compromise” has been disproven by the Stirling SU780UE, through years of third-party data, an independent DOE study and EPA industry-standard test results.

More Bad News: ULT Freezers with Compromise “Built In”

The false axiom that cooling performance must be traded for energy savings and economy has been designed into some compressor-based ULTs.  By offering two operation modes, these freezers either prioritize energy efficiency or cooling performance (i.e. temperature stability) based on operating conditions and/or user selection. However, they can’t have both at the same time!

Is it realistic to ask a researcher, who has years of work depending on the preservation of precious biological samples, to make a choice that reduces cooling performance integrity . . . for any reason . . .at any time?  Energy managers, who have little control over day-to-day ULT storage operation, might well assume that energy efficiency will be turned “off” if there is even the slightest perceived risk to sample security or piece of mind.

Why make this false choice when you don’t have to?  With the Stirling SU780UE, you’ll use less energy than any comparable ULT freezer, while preserving biological samples with the industry’s best cooling performance integrity . . . all at the same time.

Stirling Ultracold in Booth #1 at 2015 I2SL Annual Conference

As i2sl conferenceyou may know, the International Institute of Sustainable Laboratories® (I2SL) will be holding its annual conference in San Diego on September 21-23.  Of course, we strongly support lab sustainability initiatives here at Stirling Ultracold, which is why we have participated for the past three years, and will be an event sponsor this year.

I hope you’ll come by and see us in Booth #1 on the exhibit floor at the Hyatt Regency Mission Bay.  We’ll be showing our SU780UE upright ultra-low temperature freezer operating on 110v power at -80° C, using less than half the energy of compressor-based systems.  Please stop by and let us give you a “cool” live demo, including a third-party monitoring system running in real-time on our unit.

During the 8 a.m. Early Bird Session on day 3 of the conference (Wednesday, 9/23), Stirling Ultracold will be presenting a technology demonstration highlighting the impact of ultra-low cooling technology on lab sustainability.  Following that same theme, I would also recommend attending the morning Roundtable on Tuesday, 9/22, entitled Ultra Low Freezers—A Significant Near-Term Opportunity, which will be hosted by Allison Paradise of My Green Lab and Anna Levitt from University of California, San Diego.

As we’re making our final booth preparations and travel arrangements to head west, I just wanted to make sure you’re aware of this important event and invite you to connect with us while you’re there.   As of the date of this posting, it’s not too late to register for the 2015 I2SL Annual Conference, if you haven’t already.

Innovating and Manufacturing Ultra-Low Freezers in Athens, OH USA

Stirling Ultracold graphic highlighting Athens, Ohio locationBack when we were just a small group of inventors with the audacious goal of revolutionizing the ultra-cold temperature storage industry, we could have established Stirling Ultracold just about anywhere. So . . . of all places we could have built our future, why did we choose a small Ohio town in Appalachia? Why did we believe that Athens, Ohio was the right place to innovate and manufacture the best performing, most sustainable ultra-low freezer in the industry?

Why Athens?

Stirling Ultracold employee working on ULT assemblyWe made a conscious commitment to developing a U.S.-based workforce and a growing entrepreneurial culture in a region that had already established a legacy of ultra-low freezer manufacturing. Since opening our facility in 2011, I’ve been gratified and humbled by the positive impact our growing manufacturing operation has had on the lives of our people, their families and our small community. Nevertheless, the decision to locate in Athens has given back even more, supporting our growth on several levels…

Stirling Ultracold employee walking by ULTsWe have benefited in many ways from our close proximity to Ohio University, supported by the Voinovich School of Leadership and Public Affairs, Hocking College, and a surprisingly well-educated community that has helped us fill a variety of jobs, in a range of skill-levels. With startup assistance from TechGROWTH Ohio and the Ohio Entrepreneurial Signature Program (ESP), we have successfully transformed from a small R&D shop to a growing manufacturing organization. Starting from a base in Athens, Ohio, our goal is no less than becoming the #1 ultra-low freezer manufacturer in the world.

It’s from here that Stirling Ultracold products make it possible to find cures for diseases and sustain our environment, all at the same time.

The Real Answer to ULT Compressor Failure: No Compressor

Step back from the haze and hype swirling around our industry and ask yourself this simple question . . . Why are many ultra-low freezer manufacturers focused on providing backups and workarounds when a compressor fails? The obvious answer to this question is two-fold:

1. Based on experience, everyone in our industry assumes that compressors will fail at some point.

2. The biological materials stored in ULT freezers are incredibly valuable – virtually priceless to the researcher using the samples.

It is the acceptance of #1 and acknowledgement of the risk inherent in #2 that should lead ultra-low freezer buyers to question the “status quo” of using compressor technology, period. Every day, we see researchers trusting their priceless samples to the lowest ULT bidder and using an aging, failure-prone technology that is known for disrupting the preservation process.

Compressors needn’t be the “necessary evil” they have become in our industry when there is a field-proven, cost-competitive alternative. Of course, I’m referring to the free-piston Stirling engine that powers our freezers.

A Superior Technology with the Industry’s Best Standard Warranty
While the sustainability and energy saving benefits of Stirling freezer technology are increasingly acknowledged, the reliability advantages of the Stirling engine are not as well known. The superior design and quality of the Stirling cooling engine provide the foundation of our industry-leading 7-year standard warranty. You can read the blog post Myth #2: Energy Efficiency Must Compromise Reliability to learn more about this. Also, refer to the table below which compares key reliability factors of compressor cooling systems to the Stirling engine:

Stirling Ultracold Can Help Increase California Research Funding by Nearly $60M/Year

Market Assessment of Energy Efficiency Opportunities in Laboratories
Market Assessment of Energy Efficiency Opportunities in Laboratories

If you’ve been reading this blog, you know that we like to share reports about the impact of sustainability and energy efficiency on the research community.  The Market Assessment of Energy Efficiency Opportunities in Laboratories is one such study by the Emerging Technologies Coordinating Council.  Prepared by Allison Paradise of My Green Lab, as part of the Center for Energy Efficient Laboratories (CEEL), this revealing report resulted from a collaborative sponsorship of Pacific Gas and Electric Company, Southern California Edison and San Diego Gas and Electric.

The purpose of this study was to:

  1. Estimate the number and types of labs in California;
  2. Estimate the number and types of energy-consuming and water consuming equipment used in California labs;
  3. Assess operational and behavioral opportunities for efficiencies in how laboratory equipment in California is used; and
  4. Estimate the amount of energy used by lab-related facilities and systems.

Representing the largest, most comprehensive investigation of its kind in the California laboratory research market, the results of this study support the creation of energy efficiency programs specifically targeting laboratory equipment. Not only does this study clearly show that there are tremendous potential energy savings for laboratories, but it also points to several independent efforts by the EPA and individual organizations to identify, and whenever possible incentivize, energy efficient equipment and operations.

Ultra-Low Freezer Findings:
Among the many survey results, there were a number of key data points relating to the use of ultra-low freezers that I found interesting for obvious reasons.  One noteworthy finding suggests that there is up to 648 million KWh of electricity being used per year to power -80° C freezers in the state of California, alone!

Now consider this . . . Last year, it was reported by the U.S. DOE-sponsored, Better Buildings Alliance independent study that the Stirling Ultracold SU780UE ULT freezer used 66% less energy than the average cascade-compressor model ULT.  Considering that today’s commercial electric rates are $0.138/KWh in the state of California (per the U.S. Energy Information website), it can be calculated from this recent study that California labs could potentially save up to $59,019,840 per year in energy cost, by simply replacing cascade ULT freezers with Stirling models.  Below is a breakdown of the math:

648,000,000 kWh CA Freezer Annual Energy Use (max.)
X
$0.138/KWh Avg. CA Commercial Electric Rate
X
66% Energy Reduction (SU780UE vs. avg. cascade ULT freezer)
                                                                                                                                               
$59,019,840/Year Potential Energy Cost Savings in California

While that’s a lot of energy and cost savings from just one state, this doesn’t even account for the facility HVAC energy cost savings that labs will achieve, as Stirling freezers also reject less than half the heat of cascade ultra-low freezers (see our blog post, The Hidden Benefit of Energy-Efficient ULT Freezers).  And of course, let’s not forget the potential sustainability impact that transcends monetary benefits.

At Stirling Ultracold, we salute the excellent work that My Green Lab is doing with utilities and we look forward to the long-term impact that this study will have on the research community in California and beyond!

Stirling Ultracold Opens Office in Japan

Taisei Matsumoto, the CEO of Stirling Ultracold Japan, with Neill Lane at the Kiyomizu-dera temple in Kyoto, Japan
Taisei Matsumoto, the CEO of Stirling Ultracold Japan, with Neill Lane at the Kiyomizu-dera temple in Kyoto, Japan

I am pleased to announce that we have taken important step toward becoming a global leader in providing ultra-low temperature freezers.  A new Stirling Ultracold sales and service office was recently opened in Kobe, Japan. The staff in this office serves the Japanese laboratory research and life sciences marketplace, and is dedicated to supporting Stirling Ultracold products in the region.

Our exclusive Japanese partner officially opened this location in late 2014 and is operating the new office.  With a showroom of products and a dependable sales/service team now in Japan, Stirling’s presence and brand has been enhanced in the Asian market.  This also allows us to better serve our global clients who are operating Japanese-based labs.

In addition to a brick and mortar presence, a new Japanese-language Stirling Ultracold Japan website has been created for presenting Stirling Ultracold products to the local market.  With a strong local partner these steps are enhancing our position in the Japanese market and our ability to support the research community, worldwide.