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Posts tagged ‘HVAC&R blog’

Commercial Building Energy Specifications

The DOE and CBEA have some useful technology specifications out, and many more in the works.  The concept is similar to ENERGY STAR – the equipment buyer now has a guide to the most energy efficient equipment.  Besides listing products that meet the specification, they also list available incentives for the end user.  If you are a commercial or retail operator or manager, check out the work that the CBEA is doing around commercial refrigeration and air conditioning.   The list of retailers participating in the program is impressive.  The working group for refrigeration is involved in many of the same activities that we are – new refrigeration systems and components, including display cases, coolers and freezers, compressor systems, and controls.  If you are involved in selection or specification of equipment, do you find these specifications useful?  Are you searching for the most energy efficient equipment?  Let us know.

For more information on the CBEA:

Rajan Rajendran, Ph.D
Vice President, Engineering Services and Sustainability
Emerson Climate Technologies

Fuel Gas Pressure Boosting

There was a lot of talk at the recent Turbo machinery Symposium about fuel gas boosting compressors.  Fuel gas boosting compressors are now a part of most gas turbine systems.  Today’s gas turbine designs operate more efficiently and reliably, but require higher fuel gas pressures than is available from adjacent gas utility pipelines.  To complicate matters, operators must plan for fluctuations in the pipeline pressures.  Although 300 psig is adequate for older industrial gas turbines and could sometimes be reached with pipeline pressures, newer industrial turbines require 600 psig.  Aeroderivative gas turbines can handle load changes more quickly but may require supply gas pressures up to 1000 psig to operate most efficiently.  Because available gas pressures are much lower, fuel gas booster compressors are needed to raise gas supply pressure feeding the gas turbine. FGB compressors must have a large turndown range and the ability to handle gas pressure fluctuations from the pipeline while delivering constant discharge pressure. Fuel gas boosting compressors have recently been deployed in a wide variety of industrial facilities and processes including: peak power plants, oilfield power generation and landfill gas to power projects

What is your experience with fuel gas boosting compressors?  Find out more about fuel gas boosting at

Mark McCormick
Director, Gas Compression
Emerson Climate Technologies

Display Case Energy Standards

If you are involved with refrigerated display cases you might have heard about a new bill before congress called the BURR Act or Better Use of Refrigerator Regulations # H.R. 5710.  This would amend the EPACT 2005, DOE 10 CFR 431 for the portions pertaining to self-contained, medium temperature, service over counter display cases.  This equipment is now classified as a reach-in refrigerator per the DOE 2010 portion of the energy standards.  But because this style of case is all glass and uses a lot of lighting for display of product it has a large heat load as compared to a reach-in, and cannot meet the standards.

If this bill passes the service over counter (SOC) will have its own class and the energy calculation will be based on TDA (total display area) like all the cases covered by DOE 2012 which included SOC remote and ice cream cases. What this means is that the SOC.SC.M cases will now have a chance at meeting the energy standards.

Energy standards have been in place for reach-in refrigerators for many years, including federal minimum efficiency levels which are now in effect.   They were mandated by the Energy Policy Act of 2005 and manufacturers responded.  Since OEMs had already been working on ENERGY STAR models from 2001, it was not a stretch to hit the federal minimum.

The Air Conditioning, Heating & Refrigeration NEWS recently reported on this legislation.

Again, depending on the class of equipment, the calculations defined in the energy standards might be based on refrigerated volume, or could be based on total display area.  This is true for ENERGY STAR and other calculations as well, so be aware of what class of equipment is being considered because allowable energy consumption can vary greatly.

Rajan Rajendran, Ph.D
Vice President, Engineering Services and Sustainability
Emerson Climate Technologies

Energy Regulations

It has been a little more than a week since my last posting where I talked about Greenchill and the need to control leaks from systems. The other major driver of a system’s impact on the environment is energy. We at Emerson are always tracking the latest energy efficiency regulations, and 2012 brought several changes for commercial refrigeration equipment including reach-ins, ice machines, walk-ins, supermarket display cases and other stationary commercial refrigeration equipment.

For example, the allowable federal minimum energy efficiency level is actually the same as the voluntary standards set by ENERGY STAR in 2001 for reach-in refrigerators and freezers. The 2010 ENERGY STAR 2.0 standards were baselined to capture the top 25 percent of energy performers. Since 2011 the EPA requires third party lab testing for the ENERGY STAR program. The new LEED for Retail rating system includes equations to calculate levels for prescriptive path LEED efficiency, based on the previous CEE Tier 2 and California Investor Owned Utilities incentive program (CAIOU).

Energy and environmental standards are constantly changing which presents a challenge for refrigeration equipment manufacturers. I would like you all to read more about these and other useful information by clicking on this link below for the Emerson white paper “Status of energy regulations for commercial refrigeration equipment”:
Emerson Climate – Status of Energy Regulations White Paper

Rajan Rajendran, Ph.D
Vice President, Engineering Services and Sustanability
Emerson Climate Technologies

GreenChill for Food Retailers

For those of you who are unaware, the U.S. Environmental Protection Agency has a voluntary partnership with food retailers to reduce refrigerant emissions and decrease their impact on the ozone layer and climate change called GreenChill. I encourage you to visit their website ( It is a wonderful resource for more than just supermarket retailers, packed with considerable information, including: how to become a GreenChill partner; a complete library of webinars and events; and a variety of reports, guidelines and tools that will assist your company with its stewardship efforts.

 Are you a member of GreenChill? I’d be interested in learning your opinions of this group.

 Are there other similar groups or organizations you find helpful and informative that you’d like to share with us? We look forward to hearing from you.

 Again, welcome to Climate Conversations. If you who would like to receive an email notification when new blogs are posted, please click the “Follow” button located at the right side of the page.

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