To help select the proper refrigeration equipment in specific applications, many commercial retailers today are closely monitoring their compressor systems for valuable performance data. One way this is possible is through the use of software that calculates performance in a variety of scenarios. Whether through conducting annual energy analyses or evaluating efficiencies based on geographic locations, retailers are using the power of software tools to improve visibility across their operations.
In our next installment of the Making Sense webinar series, we’ll take a closer look at this subject and discuss the best practices for evaluating compressor system performance. We’ll explore the following key concepts:
Comparison of compressor and evaporator capacities
Mid-point and dew point compressor selections
Difference between Energy Efficiency Ratio (EER) and Annual Energy Efficiency Ratio (AEER)
And, you’ll learn how to use software to improve a variety of operations, planning and analysis activities, including:
Equipment planning and selection
Calculate annual compressor performance
Conduct energy analyses
Evaluate compressor performance in specific geographic locations
You’ll find there are many ways that compressor system performance data can help you improve operational visibility.
Presenters Our second webinar in the “Operational Visibility” category will be presented by Emerson Climate’s own Mike Saunders and Autumn Nicholson. Mike is the director of end user technical sales and support and has more than 18 years of experience in refrigeration product development. As a senior sales engineer, Autumn’s an expert on compressor and refrigeration system energy and Total Equivalent Warming Impact (TEWI) analysis, with a focus on refrigeration alternatives and system architecture.
Join us on March 11 at 2 p.m. EDT to learn the best practices for evaluating compressor system performance. Register now by visiting our website at www.emersonclimate.com/makingsensewebinars. While you’re there, be sure to check out the archives of other Making Sense webinars — it’s how we’re helping the refrigeration industry MAKE SENSE of the issues that matter most.
Director of Marketing, Refrigeration
Emerson Climate Technologies
California Energy Commission (CEC) authorities are delaying the implementation of the new Title 24 Energy Conservation Code by six months. The CEC believes that postponing the effective date is necessary to allow the industry to prepare for the new standards. This new energy code will have a major impact on new supermarket construction.
Energy Efficiency Standards for Residential and Nonresidential Buildings (Title 24) were established in 1978 in response to a legislative mandate to reduce California’s energy consumption. The standards are updated periodically to allow consideration and possible incorporation of new energy efficiency technologies and methods. These standards apply to residential, nonresidential, high-rise residential, and hotel and motel buildings.
New energy-efficiency standards are outlined in Section 6 of California‘s Title 24 building code to include supermarket refrigeration systems. The 2013 Building Energy Efficiency Standards (or 2013 Standards) will take effect on July 1, 2014. Section 120.6 includes the following mandatory requirements for supermarket refrigeration systems:
Floating head pressure (down to 70°F or lower)
Remote condenser specific efficiency
Floating suction pressure
Mechanical subcooling (liquid subcooling requirements for low temp parallel racks)
Supermarkets affected by these changes include an 8,000 square feet small neighborhood markets, all the way to a 150,000 square feet big box stores. Parallel rack refrigeration systems and distributed refrigeration systems must meet these new requirements.
Floating head pressure requires controls to float refrigeration system saturated condensing temperature (SCT) to 70°F during low-ambient temperature conditions. Condenser specific efficiency sets condenser fan motor efficiency requirements. Floating suction pressure requires controls to set target suction temperatures based on space temperature rather than a fixed set point. Mechanical subcooling requires liquid refrigerant to be subcooled to 50°F or less on low-temperature systems. Automated display case lighting must turn off display case lights during non-business hours. Finally, heat recovery must use rejected heat from refrigeration systems for space heating, with a limited increase in refrigerant charge.
According to a notice from the California Energy Commission, the revised effective date – July 1, 2014 will provide the building industry with full complement of tools to comply with the prescriptive and performance compliance options and sufficient time for training on the use of those tools.
Rajan Rajendran, Ph.D
Vice President, Engineering Services and Sustainability
Emerson Climate Technologies
Too often, commercial refrigeration operators decide not to upgrade the condensing units used on their walk-in coolers or freezers. The condensing units they’ve been using for years (or decades) are getting the job done, and the initial cost of upgrading equipment seems like an unsafe investment. Often, operators ask themselves: “Will I really see a return on this investment, and how long will it take before it starts to make money for me?” Both are valid questions.
The good news is that condensing unit technology is advancing at an unprecedented pace. And, with these advancements, ROI is achievable sooner than most operators can imagine. The Copeland Scroll™ Outdoor Condensing Unit (XJ Series) for commercial refrigeration is a perfect example. It combines the latest Copeland Scroll compressor technology, variable speed fan motor control, large condenser coils, and a high-efficiency fan blade to deliver up to 40 percent higher annual energy efficiency when compared to standard industry offerings. In fact, customers can typically expect an upgrade payback of less than one year based on energy savings alone.
In addition, each Copeland Scroll Outdoor Condensing Unit is equipped with standard on-board CoreSense™ diagnostics that provide field technicians with key information to quickly and accurately troubleshoot system issues, lower maintenance costs and eliminate nuisance service calls. Its built-in compressor protection capabilities also help to extend equipment life.
The other good news is that many utility companies are offering rebates for installing energy-efficient equipment, which helps to significantly offset your initial investment.
So my message to you is a simple one: take the plunge. If you choose the right equipment, your investment could start adding dollars to your bottom line.
I recently presented a Making Sense webinar with my colleague Seth Hoehn, where we explored the many advantages of shifting controls from the refrigeration rack to the case through the use of case controls and electronic expansion valve (EXV) technologies. Case controls can precisely monitor conditions in real time and offer dramatically improved operational and energy efficiencies, especially when coupled with the use of an EXV. At the end of the day, we detailed four ways that first costs and ongoing savings can be achieved through shifting controls from the refrigeration rack to the case.
Electrical installation. A case control architecture provides savings through reduced field wiring: Up to 30 percent reduction in branch feeder wiring; potential elimination of circuit panels and breakers; elimination of line and low voltage control home runs to the rack; simplified connections at the case; and the installation benefits of OEM factory wiring.
Piping and refrigerant. Shifting from individual liquid and suction lines at the rack to a loop system with common liquid and suction lines at the case reduces pipes, fittings, insulation, hangers and labor — and the potential for refrigerant leakage. The simplified piping results in material savings of up to 50 percent, and refrigerant charge reduction of 10 percent or more. This architecture also enables temperature and rack control at the case itself.
Maintenance and leak reduction. Another benefit of the case control architecture is a reduction in commissioning/startup time by two to three days. This is due to quicker leak checks, reduced refrigerant charge, and not having to set superheat (since it is automated via electronics). The persistent data that’s available from the electronic controls and EXVs eliminates the need for seasonal maintenance and adjustments of mechanical TXVs, while providing “eyes into the system” for ongoing, remote visibility and diagnostics.
Ongoing energy savings. The precise control enabled at the case level reduces energy used at the evaporator, eliminating the pressure drops and other parasitic losses associated with traditional systems. Case controls with EXVs allow for low condensing operation, which significantly reduce energy at the rack through continuous, automatic superheat regulation. Once installed, a case control system promises to deliver significant energy savings for years.
We often hear that a barrier to utilization of case controls and EXVs is the investment required to get started. But, as we’ve shown, equipment costs are quickly offset by the savings. When you consider the reduction in first costs — from simplified installation of electrical distribution and piping systems to faster startup times — and the ongoing energy and maintenance savings that can be realized annually, we feel there’s a compelling case to use case controls and electronic expansion valves.
Our next webinar will be presented live from the AHR Expo show floor in New York City on January 21, 2014 — details coming soon! If you want to view any of our previous Making Sense webinars, they are available for download on our website at www.emersonclimate.com/makingsensewebinars.
Director of Product Management, Retail Solutions
Emerson Climate Technologies
Commercial & Residential Solutions is a global innovator of energy-efficient heating, air conditioning and refrigeration solutions for residential, industrial and commercial applications. www.climate.emerson.com