ASHRAE Journal - January 2009 - (Page 28) Heat Pumps By Roy Hubbard, Member ASHRAE Water-to-Water M any owners and designers of large commercial, institutional, and industrial (CII) facilities are considering the economic and environmental benefits of a water-to-water heat pump as a supplement to, or substitute for, a fossil fuel boiler. While a typical hot water boiler has a coefficient of performance (COP) of 0.85, heat pumps can have COPs of 3.50 or higher, which makes a compelling case for including heat pumps in many facilities. An overview of the benefits and some of the applications for heat pumps appeared in an article titled “Using Waste Heat for Energy Savings,” which was published in the April 2006 issue of ASHRAE Journal. In CII facilities, a variety of water 28 ASHRAE Journal hot water are often used simultaneously include: hospitals, pharmaceutical plants, hotels, and campus central utility plants. In these facilities, a heat pump can substantially cut energy consumption, and reduce a facility’s carbon footprint. This article discusses several system design guidelines, energy consumption calculations, green technology benefits, and capital constraint solutions for this specific heat pump application. System Design Guidelines streams can act as heat sources for a heat pump. This article examines one application in detail: a facility that has a simultaneous requirement for chilled water and hot water, wherein the heat pump can provide or supplement both. Facilities in which chilled water and ashrae.org These guidelines have been developed in conjunction with many facility owners About the Author Roy Hubbard is senior marketing manager, technology—HVAC systems, for the Building Efficiency business of Johnson Controls Inc., in York, Pa. January 2009 http://www.ashrae.org
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