Articles by Marcia Karr

Variable Refrigerant Flow vs. Buildng Codes

When newer technologies or techniques meet older codes written for an earlier version of engineering reality, the losers are the users and occupants.
Variable refrigerant flow (VRF) HVAC is quickly taking over market share of the industry for commercial buildings.
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VRF Heat Pumps In The Real World

Wide temperature swings, submetering deficiencies, bloated carbon footprint … these are but three of the problems tackled in two contrasting projects in the Northwest.
How is variable refrigerant flow (VRF) working for you? We asked a number of people that question and summarized the findings from two typical facilities here.
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Engineered Systems Magazine

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2014 November

Check out the November 2014 issue of Engineered Systems and the cover story: District Chilled Water Systems Design: A Tale Of Two Footprints.

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