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Water-Cooled Electric Chillers
March 26, 2009 | Updated: May 29, 2012
Although a chiller’s annual energy costs can amount to one-third of its purchase price, choosing one that is most efficient at full or part load might be counterproductive because the ratings don’t measure the efficiency of the overall cooling system.
Content type: Resource Guide | Document ID: CEMC-RG-7 | Author: Peter Criscione, Jarett Zuboy
Waste Not, Pay Not: Energy Recovery Ventilation
March 21, 2012
Proper ventilation is essential for maintaining good indoor air quality, yet it places an additional burden on heating and cooling equipment, which must condition air that will soon be exhausted from the building. Fortunately, energy recovery ventilation systems can help ameliorate this problem.
Content type: Research Brief | Document ID: TAS-RB-41 | Author: Essie Snell
Hybrid Ground-Source Heat Pumps
Slides
March 20, 2012
These are the presentation slides.
Content type: Slides | Document ID: EMN-TB-1a | Author: Mary Horsey
Hybrid Ground-Source Heat Pumps
March 20, 2012
Ground-source heat pumps are often prohibitively expensive because they're sized to meet the peak heating or cooling loads for commercial buildings. This video Tech Brief explains how hybrid models downsize the ground heat exchanger and use small supplemental cooling towers or boilers to meet peak load. ...
Content type: Tech Brief | Document ID: EMN-TB-1 | Author: Mary Horsey
Finding Chiller Ratings
April 13, 2011
How can I get certified performance data for a specific chiller?
Content type: Ask E Source | Document ID: TAS-AskES-41 | Author: Peter Criscione
New Doors Are Opening for Widespread Economizer Cooling in Data Centers
January 19, 2011
A recent analysis of data center operation by a leading engineer is challenging the widely accepted belief that data centers need tight temperature and humidity control. The study concludes that loosening these controls could translate into as much as a 63 percent savings in cooling energy.
Content type: Research Brief | Document ID: TAS-RB-27 | Author: Peter Criscione
Finding the Efficiency of Old Air-Conditioning Equipment
January 14, 2011
How can I determine the efficiency of old air-conditioning equipment?
Content type: Ask E Source | Document ID: TAS-AskES-36 | Author: Peter Criscione
Beware Dubious Savings Claims for Desiccant Dehumidification Panels
January 12, 2011
Do desiccant dehumidification filters really cut air-conditioning and refrigeration costs? Are the savings claims valid for “drop-in” media that are not continuously regenerated?
Content type: Ask E Source | Document ID: TAS-AskES-27 | Author: Leland Keller
Study Finally Evaluates an Evaporative Precooler Retrofit, with Mixed Results
August 2, 2010
Results are in from the first field testing of retrofits of evaporative precoolers and they are mixed but promising!
Content type: Research Brief | Document ID: TAS-RB-15 | Author: Mary Horsey
Variable Refrigerant Flow Systems
March 26, 2010
Variable refrigerant flow systems promise higher efficiencies and other benefits compared to other heating and cooling solutions. However, the jury is still out as to how well they perform. We discuss both the theoretical and evaluated evidence supporting this up-and-coming technology.
Content type: Resource Guide | Document ID: TAS-RG-19 | Author: Peter Criscione and Joe Shekiro
Air-Source Electric Heat Pumps
December 17, 2009
Air-source electric heat pumps are year-round space-conditioning systems capable of providing heating, cooling, and domestic hot water in a single piece of equipment. They often offer a lower capital cost and lower operating cost than electric resistance heating and, in some cases, gas heating.
Content type: Resource Guide | Document ID: TAS-RG-22 | Author: Peter Criscione
Geothermal Heat Pumps for Commercial Applications
August 24, 2009
Geothermal heat pumps use the relatively constant temperature of the earth to provide efficient heating and cooling. This Resource Guide looks at applications in commercial buildings.
Content type: Resource Guide | Document ID: CEMC-RG-11 | Author: Ira Krepchin
Cost-Cutting Technique Puts Refrigerant Charge in the Palm of Your Hand
July 29, 2009
A breakthrough temperature-based technique for determining and adjusting refrigerant charge levels in air conditioners has the potential to reduce the costs of maintaining equipment efficiency.
Content type: Tech News | Document ID: TAS-TN-8-09e | Author: Mary Horsey
Cool Thermal Storage for Unitary Air Conditioners
July 17, 2009
After a decade of development, ice storage for small unitary air conditioners is still expensive but has the potential to be competitive with several utility-scale electricity storage technologies. It remains to be seen if the latest generation of equipment can live up to manufacturer projections.
Content type: Resource Guide | Document ID: TAS-RG-17 | Author: Mary Horsey
Air-Side Economizers
June 12, 2009
Air-side economizers can save 8 to 20 percent of HVAC energy use. However, they are also well known for malfunctioning and wasting significant amounts of energy. You can avoid this by adhering to requirements for properly installing and maintaining economizers.
Content type: Resource Guide | Document ID: CEMC-RG-10 | Author: Peter Criscione
Water-Cooled Electric Chilled-Water Systems
Operations and Maintenance Checklist
April 8, 2009
There’s a lot that can go wrong with electric chilled-water systems if they aren’t properly operated and maintained. This also means there are many opportunities to achieve significant energy savings and improved occupant comfort through improved operations and maintenance practices.
Content type: O&M Checklist | Document ID: CEMC-OMCK-3x | Author: Peter Criscione and Jarett Zuboy
Water-Cooled Electric Chilled-Water Systems
Operations and Maintenance Checklist (PDF Outline Version)
April 8, 2009
This checklist covers control strategies, maintenance practices, and retrofit options. Use this printable PDF outline version to track your own progress through the different categories and take notes.
Content type: O&M Checklist | Document ID: CEMC-OMCK-3-WS | Author: Peter Criscione and Jarett Zuboy
Tech Roundup—December 2008
Web Conference
December 3, 2008
We’ve distilled the most exciting energy developments of the past six months into one 90-minute session that you can’t afford to miss! Although we’ll be creating detailed reports about many of these options, our Tech Roundup provides a quick high-level summary of the latest technologies. ...
Play audio and video (streaming video)
Download Presentation (1435 KB PDF)
Content type: Web Conference | Document ID: TAS-WC-12-08 | Author: Micah Allen
Tech Roundup—December 2008
Recording
December 3, 2008
This is the web conference recording.
Content type: Recording | Document ID: TAS-WC-12-08-R | Author: Micah Allen
Tech Roundup—December 2008
Slides
December 3, 2008
These are the web conference slides.
Content type: Slides | Document ID: TAS-WC-12-08-SL | Author: Micah Allen
Rooftop Units
March 20, 2008
A single-packaged air-conditioning rooftop unit (RTU) is a type of unitary air conditioner, a category that includes both single-packaged and split systems. RTUs are sometimes referred to as packaged units because they are self-contained.
Content type: Resource Guide | Document ID: TAS-RG-8 | Author: John Sustar and Peter Criscone
