A Systems-Efficient Approach to Hospital De-carbonization

Kaiser installs Heater Recovery Chiller in Disadvantaged Community

Institute of Gas Technology dba GTI Energy

Recipient

Des Plaines, IL

Recipient Location

37th

Senate District

68th

Assembly District

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$1,077,640

Amount Spent

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Active

Project Status

Project Update

Retrofit designs for the Kaiser Permanente Baldwin Park heating, ventilation, and air conditioning (HVAC) system has been completed and approved by the California Department of Health Care Access and Information, although small adjustments to the design are ongoing. The design includes improvements to 16 air handling units, heat recovery from the boiler stack, and installation of heat recovery chillers, as well as instrumentation to monitor equipment performance. SkySpark, a software analytics platform that analyzes system level building data and analytics, is being used to trend HVAC data and performance. Installation of new air handlers and their components has been underway since August of 2022 and is expected to be completed in early 2024. Boiler heat recovery is scheduled for installation in 2023 and early 2024. Heat recovery chillers are scheduled for installation in early to mid 2024. Subcontractor Stok has developed the baseline energy model of the building, including establishing the zoning and HVAC baselines, and is currently working on the retrofit model. The project team will develop a final report that will include the modeling, new air handlers, the control system, and the work up for the new heat recovery chillers and stack gas economizers.

The Issue

Hospitals, due to the nature of their work, their need for exacting climate control, and their operation on a 24-hour basis, have higher energy intensity per square foot than any other building in the commercial sector.

Project Innovation

The project aims to reduce both the gas consumption and greenhouse gas (GHG) emissions at the demonstration site by approximately 30%. This will be accomplished by integrating heat recovery chiller design and boiler stack economizers to reduce steam boiler fuel requirements for the domestic hot water and heating hot water systems. The project will implement a variable air volume system (VAV), design air handlers with separate cold and hot decks to optimize economizer mode, and have model-based optimal control strategy to minimize building HVAC energy consumption.

Project Benefits

The project integrates heat recovery chiller design and boiler stack economizers to reduce gas requirements for the domestic hot water and heating hot water systems. The project also includes a VAV system, air handlers with separate cold and hot decks to optimize economizer mode, and a model-based optimal control strategy. The integration of different heat sources (a heat recovery chiller using heat from the compressor gas and stack economizers using waste stack heat from the boilers) at different pressures and temperatures requires an advanced model to initially design, and then robust measurement and verification to successfully operate, this kind of system. The advancement of technology is associated with harnessing these different systems together, including the condensation of stack gas, all of which contribute to lower gas and electricity use.

Lower Costs

Affordability

The integration of a number of advanced technologies could reduce gas use by 30% and reduce overall operating costs by approximately $1 million per year, including about 200,000 therms of gas and over 8,000 megawatt-hours of electricity.

Key Project Members

Project Member

Hardik Shah

PM
GTI Energy

Subrecipients

Rocket

P2S Engineering

Rocket

Stok

Rocket

Match Partners

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Institute of Gas Technology dba GTI Energy

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Kaiser Permanente National Facilities Services

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