St. Paul's Hospital

Project details

Project Type


Project Focus

Chiller Replacement with Heat Pump and TGH


Predicted over 800 tons of carbon, under 3-year payback on energy savings


A chiller had reached end of life and complex pumping issues were occurring. Traditional passive run-around loops were under-utilizing exhaust thermal energy and simultaneous heating and cooling opportunities were not being capitalized upon. A collaborative design process resulted in a very simple TGH using a new heat recovery chiller integrating the heating, cooling and heat reclaim systems with the ability to reclaim or reject heat to the exhaust based with temperatures optimized based on the variable demands. This resulted  in 800 - 1,100 tons of carbon saved annually with a very short payback on energy cost.

This project is now underway using Carbon Neutral Capital Program (CNCP) funding.