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Topic: Refrigerative cooling 
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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
Air-Cooled Electric Chillers
December 28, 2011
Air-cooled electric chillers can be more attractive in hot, humid climates and certain applications in other climates compared to water-cooled chillers and rooftop units. However, in most of North America, water-cooled chillers are more efficient and have a lower life-cycle cost.
Content type: Resource Guide | Document ID: TAS-RG-28 | Author: Peter Criscione
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
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
