The Atlantic: IPS for Multifamily Efficiency

Overview

The Atlantic is a 25-story, 270-unit multifamily tower in Philadelphia. The team needed a system that would support long-term performance, reduce piping complexity, and deliver stable comfort for residents. After reviewing several HVAC approaches, they selected Williams’ Integrated Piping System (IPS).

Project Drivers

The team wanted better energy performance, a compact mechanical footprint, and occupant comfort without noisy in-unit equipment. They also needed a system that could support different exposures in the same building.

System Strategy

The team evaluated a range of options: water source heat pumps, two- and four-pipe systems, PTAC, VRF heat pumps, and IPS. PTAC units were rejected due to efficiency and noise. Two-pipe systems could not meet the need for simultaneous heating and cooling. Four-pipe systems and water source heat pumps offered performance but required higher first cost. IPS delivered simultaneous heating and cooling with less piping by using domestic hot and cold water lines.

Implementation Notes

The system includes a 750-ton cooling tower, two 375-ton compressors, three condensing boilers, a storage tank tempered to 120°F, and two 300 PSI plate-and-frame heat exchangers. Hydronic piping is 3-inch to 10-inch 304 stainless, all components are NSF 61 certified, and the system can run in heating and cooling mode simultaneously.

Results

The Atlantic achieved balanced comfort with fewer pipes and fewer in-unit compromises. IPS supported the project’s cost and coordination goals while maintaining performance in a high-rise envelope.

Takeaways

• Select systems that can heat and cool adjacent zones at the same time.
• Reduce piping runs to control cost and installation risk.
• Prioritize quiet, efficient in-unit comfort for resident satisfaction.