Air Conditioning

Built in 1929, 1500 Walnut Street is a 22-story, 270,000-sq-ft commercial building in Philadelphia. When SSH Real Estate purchased the property in 2005, it was faced with a failing HVAC system....More

Air infiltration long has been a little-understood or even ignored factor when it comes to energy efficiency in commercial buildings. Engineers understand it exists, but tolerate its existence by simply accounting for it in heating- and cooling-system design....More

As air-conditioning equipment ages, its ability to maintain adequate space temperatures and humidity levels declines. Often, the culprit is reduced coil heat-transfer effectiveness, or the ability of air-handling-unit cooling coils to remove heat from air. Evidence shows this drop in performance can occur within five years of startup....More

Using an aerosol sealant to seal ductwork from the inside saved a luxurious condominium complex thousands of dollars in project costs while proving minimally disruptive to residents....More

Engineers designing HVAC systems for use in schools, hospitals, factories, and office buildings face a host of conflicts and tradeoffs when trying to comply with both ANSI/ASHRAE/IES Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, and ANSI/ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality. To help engineers achieve balance between the two, Rawal Devices Inc. recently published a technical brief....More