Northfield Savings Bank
The heating, ventilation, and air conditioning (HVAC) system at Northfield Savings Bank was designed to maximize the interior environmental conditions for indoor air quality and comfort while being energy efficient.
The primary heating and cooling method is a water source heat pump system. Each zone consists of ducted or a console type terminal unit with an average heating coefficient of performance (COP) of 5.2 and an average cooling energy efficiency ratio (EER) of 13.5. The water source system is heated by a high efficiency condensing gas boiler system with an efficiency of up to 95.9% AFUE. A closed circuit cooling tower with variable speed fans provides heat reduction. High efficiency pumps with variable speed control are used to distribute the water from the heating or cooling source to the terminal heat pumps. A water source system was selected based on modeling building energy use against several other high efficient HVAC systems. The heat pump system provided the best overall efficiency and performance.
In addition to meeting the heating and cooling needs of the facility, a heat recovery ventilation system was also installed. The selected air handling equipment provides a constant exchange of fresh air throughout the building during the occupied hours. This system is designed to be 73% efficient, exchanging energy during the heating and cooling seasons.
Maintaining energy efficiency is very important to Northfield Savings Bank. The automatic temperature control system installed is a fully integrated digital control system and energy management system. Key energy utility systems such as fuel, electric, and service water systems will be metered and monitored to assess energy usage in real time and over time. A kiosk will be displayed in the Northfield Savings Bank lobby, available to customers and employees, to view the building energy consumption. We anticipate this building to show minimal energy consumption as compared to buildings of similar size and use.