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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