HVAC Construction Project:
Electric Chillers Installation in Corporate High-Rise

We really appreciate Donnelly’s expert project management and attention to the details, including managing the rigging that lifted the 900-ton and 2050-ton chillers from the truck up to the 13th floor through the curtain wall. It’s difficult to do a project of this size without any issues.

Chief Engineer at Boston Properties

Project Type
Electric Chillers Installation in Corporate High-Rise Building
Donnelly Division
Industry
Class-A Office Space
Client
Boston Properties, one of the largest and most prestigious Developers, Owners and Managers in New York City of Class-A office space totaling millions of square feet.
Issue

The base building’s existing steam absorption chillers, that provide the large-tonnage central air conditioning, had served beyond its useful life and needed to be replaced. After judicious consideration of all the factors, the client opted to replace their existing absorbers with new electric chillers. Electric chillers offer a number of key benefits such as higher COP (Coefficient of Performance), lower equipment purchase cost, a 50% savings in required floorspace, shorter installation time, and overall reduced energy consumption for added cost savings.

Serving a long list of premier tenants, it was important to the client that the project be completed in a timely fashion, avoiding both unscheduled downtime and additional costs.

Scope of Work

Donnelly Mechanical won the competitive bid and was awarded the project, which included:

  • Project planning, 3D modelling, and management;
  • Removal of the existing steam absorption chillers from the mechanical room on the 13th floor;
  • Managing the rigging;
  • Hoisting and installing two new electric chillers (900-tons & 2050-tons) to the 13th floor mechanical room;
  • Installing critical electrical equipment to power the new chillers;
  • Installing 3 Liebert split system A/C units on the 61st & 63rd floors (to cool critical electrical equipment);
  • Modify and reconfigure ductwork and piping.
Results

Having provided accurate estimates, Donnelly completed the project on-time and within budget. Donnelly’s BIM capabilities and strategic alliance with Elite CAD Designs facilitated detailed 3D modeling to ensure successful project planning and logistics. Donnelly’s expert project management and attention to safety kept workers and equipment safe throughout this challenging installation project. Additionally, all work sites, including the mechanical room, were left clean and fully operational at the conclusion of the project.

“Replacing our chillers was a big decision that required detailed planning. Donnelly’s BIM capabilities were a real asset, providing us with a failsafe way to accurately plan for the costs and logistics well in advance.  We really appreciate Donnelly’s expert project management and attention to the details, including managing the rigging that lifted the 900-ton and 2050-ton chillers from the truck up to the 13th floor through the curtain wall. It’s difficult to do a project of this size without any issues. Donnelly does such a great job. They made the entire process seamless and painless.”

Chief Engineer at Boston Properties

Why Donnelly
Donnelly Mechanical received a request to bid this project because we are well-known in the industry for our vertically integrated, highly experienced HVAC Critical Projects Construction Division. Donnelly’s past successes with similar projects, coupled with our 3D modelling capabilities and expert Project Management, provided our client with the experienced partner they required – from an accurate bid through to post-construction follow-up.
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