SUSTAINABILITY WALT VERNON – CEO; SHANNON BUNSEN – SUSTAINABILITY PROJECT MANAGER, MAZZETTI+GBA
Sustainability planning for medical equipment
Almost a decade ago, Stanford University began working on the design of a new one million square foot adult hospital and a 500,000 square foot children’s hospital nearby. Both projects had aspirations for deep sustainability. Both design teams sought to find medical equipment planners who could help to develop strategies for sustainable medical equipment as a critical element of planning a high performance building. Nobody could answer the call because the information simply did not exist.
The large and growing consumption of energy driven by the profusion of medical equipment is undocumented so cannot be tracked or controlled – the data simply is not there. But the issue of equipment energy consumption has several other challenging dimensions. First, the sheer amount of equipment is growing every year. Second, the nameplate data provided for the equipment often does not reflect the ongoing consumption of the equipment, with implications for system design and efficiency. Third, the energy consumption is often ignored during procurement and poorly managed afterwards. Fourth, the equipment has finite lifetimes and end of life management creates significant issues. Finally, the procurement, use and disposal of the equipment has other potential environmental consequences. The nameplate issue is particularly
problematic as it tends to exacerbate the others. Manufacturer nameplate data generally reflects peak condition and not the normal operating state. As a result, design professionals are forced to oversize their systems to accommodate these worst case loads.1
In
addition to the direct energy consumption of a piece of equipment, its operation also generates heat, which needs to be removed from the space. Resulting ventilation systems, especially those using constant volume with terminal reheat, will provide too much cooling most of the time, and therefore too much reheat for each individual piece of equipment. Aggregated over the whole of a building, this wasted energy is huge.
IFHE DIGEST 2018 300 270 250 223 200 150 100 100 50 0 116 101 116 263
n Total EUI n Space heating n Service hot water n Misc process gas n Fans and pumps n Space cooling n Misc electrical equipment n Lighting
Source: University of Washington, Targeting 100 Study
240
2030 Challenge Target: 60% of CBECS – 108 kBtu/ft2
yr
Option A1 Code compliant
Option A2 Target 100 Ground source heat pump
Option A3 Target 100 Heat recovery plant
Option B1 Code compliant
Option B2 Target 100 Ground source heat pump
Under all energy reduction scenarios, consumption of medical equipment remains constant and growing as a percentage.
Walt Vernon
Walt Vernon PE, MBA, LD, LEED AP, EDAC, FASHE is the CEO of Mazzetti+GBA, a global provider of MEP engineering design and technology/IT consulting in healthcare. Mazzetti creates future-focused, technologically advanced buildings,
rooted in local culture, climate and economy. Walt has been partnering, consulting and advising healthcare clients for more than 30 years, with a keen focus on future planning. Walt serves and leads various US and international code committees, including NFPA99 Electrical Systems Technical Committee, ASHRAE 189.3 Committee, Facilities Guideline Institute (FGI) and the International Federation of
Healthcare Engineering (representing the US). Walt regularly presents and publishes on various topics addressing the greatest challenges in the built environment in healthcare.
Shannon Bunsen
Shannon Bunsen joined Mazzetti+GBA in 2017 as sustainability project manager. She also leads The Sextant Foundation, a sustainable development not for profit organisation that works in healthcare settings in the developing world. She brings
over five years’ experience in sustainability programme management. She was the University of Wisconsin Health’s first sustainability co-ordinator, a position she created. Shannon holds a BS from the University of Wisconsin-Madison, with continuing education certificates in process improvement and change management.
65
Option B3 Target 100 Heat recovery plant
EUII kBtu/ft2
yr
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