After numerous water leaks, compressor failures and damper control problems, it was time for South High Community School in Worcester, MA to replace the 30 year old HVAC rooftop units. Not only had the units outlasted their expected mechanical life, but the ability to deliver fresh outdoor air and maintain comfortable heating and cooling conditions became increasingly difficult and expensive. To specify a state-ofthe- art replacement HVAC rooftop system, the energy and environmentally conscious school district enlisted the services of a local engineering firm.
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As one of the nation’s largest retailers with more than 1,700 stores and revenues
exceeding $65 billion annually, the Target Corporation takes pride in providing
an exceptional shopping experience. In 2009 the retail chain decided to add
refrigerator cases to expand the grocery section of their existing stores. Based
on engineering, Target understood that retrofitting existing stores would result in
higher humidity levels. This knowledge made it necessary to implement a system
that would properly control the higher humidity, which would eliminate fog
build-up on the door of the cases. An added benefit would be to find a more
efficient, cost effective way to provide the ideal shopping climate.
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When owners of the Tahlequah City Hospital decided
to build a new Medical Office Building in Tahlequah,
Oklahoma, they wanted the four-story building (43,000 sq.
ft) to use a Variable Refrigerant Volume (VRV) system within
the building’s heating and cooling system. The engineers
designing the HVAC system, Flynt and Kallenberger—
Consulting Engineers, knew this request would present
issues that needed to be addressed in the design phase
in order to be successful.
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