Using the AEDG in large hospitals

06/14/2013


Case study: Saving energy at a Denver hospital

As an example of the impact of achieving the target energy savings, information and projections for a new, large, energy-efficient hospital in the Denver area are shown. Actual energy usage has been tabulated and graphed, with the AEDG 50% energy use target entered to calculate projected annual energy cost savings. This facility currently is consuming 210,000 Btu of energy per year, well below what we typically find for new hospitals. Annual utility cost is slightly more than $1.6 million. If the AEDG 50% reduction goal of 107,000 Btu/sq ft for climatic zone 5B is obtained, with the same proportion of electrical and gas use, savings would be more than $800,000 per year.

Figure 4: For St. Anthony Hospital in Lakewood, Colo., to obtain its goal, the greater portion of reduction will have to come from fossil fuel use for heating and humidification. This shows 50% energy use projection, assuming fossil fuel reduction is more

In this example, 61% of energy used by Btu is fossil fuel energy, and 39% is electrical energy; it is not likely that electrical energy use can be cut in half. This implies that to obtain the goal, the greater portion of reduction will have to come from fossil fuel use for heating and humidification (see Figure 4). Proportionately, electrical savings would be less, and fossil fuel more, with annual cost savings closer to $450,000 than $800,000. In any case, it will take more than adjusting lighting and HVAC settings to obtain the energy use reduction goal. Plug loads from items like medical equipment will have to be addressed.

In conclusion, energy efficiency must be long lasting and sustainable. If planning is followed by simplicity of design, quality construction, validation, loop tuning, and operator education, it will be real and sustainable. It will last longer, and not only be energy efficient initially but also remain energy efficient as modifications to improve or expand are implemented.

Lastly, we stress the importance of tracking and documenting energy usage. Once a full season of performance has been completed, final proof will be actual energy usage. It may not meet or beat the 50% AEDG energy target for performance, but we will be able to confirm the actual Btu/sq ft. Hopefully, we will have reached the goal, but if not, the intent of energy efficiency will have been at least partially fulfilled—there will simply be more work to be done, with real loads, real equipment, and real weather.


Pete Sabeff is president of Engineering Economics Inc., where he has been troubleshooting and commissioning hospital HVAC systems for most of his 40 years in the business. He began as a controls applications specialist, became an energy consultant, and for the past 28 years has been an owner’s representative and commissioning agent.


<< First < Previous 1 2 3 4 Next > Last >>

No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
High-performance buildings; Building envelope and integration; Electrical, HVAC system integration; Smoke control systems; Using BAS for M&V
Pressure piping systems: Designing with ASME; Lab ventilation; Lighting controls; Reduce energy use with VFDs
Smoke control: Designing for proper ventilation; Smart Grid Standard 201P; Commissioning HVAC systems; Boilers and boiler systems
Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Consulting-Specifying Engineer case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.

Protecting standby generators for mission critical facilities; Selecting energy-efficient transformers; Integrating power monitoring systems; Mitigating harmonics in electrical systems
Commissioning electrical systems in mission critical facilities; Anticipating the Smart Grid; Mitigating arc flash hazards in medium-voltage switchgear; Comparing generator sizing software
Integrating BAS, electrical systems; Electrical system flexibility; Hospital electrical distribution; Electrical system grounding
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.