Nicholas J. Hagan
Dr. Donghyun Rim
This final thesis report consists of a yearlong study of the mechanical systems for Bedford Medical Outpatient Building. This report is focused on the re-design of the mechanical systems in attempt to improve the existing systems of the building. In order to evaluate the success or failure of the proposed design options, initial studies focused on the existing ventilation system performance, load demands, energy performance, and current utility costs. The main goals of the proposed designs are to improve energy efficiency as much as possible, while simultaneously keeping the total project cost at a reasonable value. These project goals are kept in mind when assessing each depth and breadth topics.
Executive Summary
Elliot Health System – Bedford Medical Outpatient Building is a local health care and hospital system located in Manchester, New Hampshire. Their new Medical Outpatient Building is located in Bedford, New Hampshire. The New England region is considered a four-season climate with similar cooling and heating loads. the building will provide residents with urgent care, radiology rooms, labs, and family medicine. Because of this extra attention must be paid to the filtration of air, humidity levels, temperatures, and quality of the outdoor air. Bedford MOB is being fit-out to a core and shell that is to be designed and constructed at the same time as the fit-out. The building totals 57,000 square feet over 3 stories with a CTE scanner on level 1, lab and exam rooms located on all floors, pharmacy on the ground floor and the mechanical and electrical rooms located on the ground floor. The ground floor is only half the size of the other two floors with plenty of room for expansion. The rooftop mechanical area allows a maximum footprint of approximately 15,000 square feet and currently has 6 RTU’s on it. This document analyzes the existing mechanical system of Bedford Medical Outpatient Building. It was proven that Bedford MOB complies with ASHRAE standards 62.1 and 55. The energy analysis performed in IES VE concluded that the building will requires 95 tons of cooling and 72 tons of heating. It is my goal to provide an energy efficient alternative to the existing system. The following analysis will touch upon design objectives and requirements, outdoor and indoor design conditions, design ventilation requirements, annual energy costs and savings and so on. Bedford MOB currently uses 33% minimum Outdoor Air units, using a Variable Air Volume system. Temperature set points can be reached during the cooling season with condensing units located in the packaged RTUs and with reheat coils provided from the VAV boxes. The reheat coils provided humidification control as well as temperature control. Bedford MOB was designed to comply with both the IBC 2009, NFPA 101-2003, NEC 2008 which provide code for energy use, fire protection, construction standards, and so on. An energy model was run on Bedford MOB to evaluate the heating and design loads as well as the annual energy consumption, and operating costs. This will be used as a basis in future design models and analysis. Multiple software has been utilized in this process, as there are many designed to analyze building performance with specific systems. This document also analyzes the heating, humidification, and air-side systems. The cost of the entire building comes to $11 million or $192/SF. This is a medical building, which results in certain aspects of the system having higher standards and specific parameters incorporated into the design and function of the system. Such parameters include room balancing, outdoor air percentage, temperature, humidity, and air quality.