Representative Projects

Completed August 2008, Two International Group developed this 3-story, 80,000 square foot office building at Pease Tradeport, Portsmouth, NH. In addition to mechanical system design we provided building envelope consulting, energy modeling and LEED documentation.

Design Features:

• Central hot water and chilled water 4-pipe heating and cooling system
• High efficiency heating plant with condensing boilers
• Water side economizer
• Dedicated outdoor air ventilation system with energy recovery and CO2 control.

We provided mechanical engineering for this renovation of this historic mill building on the Powow River in Amesbury, MA developed by TMS Architects .

Design Features:

• High efficiency condensing boiler
• Energy recovery ventilation
• Variable refrigerant volume (VRV) air conditioning

The Rural Land Foundation emphasized a sustainable design effort for their project, which consisted of a Post Office, restaurant space and office space within a common structure.

Sustainable Design Features:

• Energy recovery ventilation
• High efficiency condensing boilers
• Solar thermal domestic hot water heating

Developed by John S. Jordan Design this project was completed in 2010. The 142,000 square foot renovation was formally a mill and has been converted into an apartment building.

Developed by Schoonmaker Architects and financed through the NH Housing Finance Authority, this project was completed in 2006. The 70,000 square foot 4-story building was formally a shoe manufacturing plant and has been converted to a 60-unit apartment building.

Design Features:

• Continuous insulation outside of the exterior wall structure
• Condensing gas boilers for heating and hot water
• Perimeter baseboard heating
• Heat relief ventilation serving the top floor corridor
• Exterior fixed shading to reduce solar gain

Recently completed, Emmaus, Inc., an affordable housing agency built this 21-unit, 10,000 square foot studio apartment building.

Design Features:

• High performance building enclosure featuring high density spray foam insulation
• Straight-forward hydronic baseboard heating system with space heating and hot water supplied by 2 wall-hung condensing gas boilers
• Simple ventilation strategy with bathroom and kitchen ventilation with passive inlet air providing make-up air to individual units
• Low flow plumbing fixtures

Recently completed, a 4-building, 30,000 square foot complex includes housing for 50 students and a commons building. At the heart of this project is a biomass district heating plant providing heat and hot water for the three new student housing buildings and the renovated student services building.

Design Features:

• High performance building enclosures
• Wood pellet boiler central heating plant
• Drain water heat recovery
• Composting toilets
• Energy recovery ventilation

This project included three 2,400 square foot homes for faculty housing. Energy efficiency and green design were among the top priorities for the project. In addition to the mechanical design, we consulted on the thermal enclosure design.

Design Features:

• High performance building enclosure
• Energy recovery ventilation system
• Solar thermal domestic hot water heating
• Ground source heat pumps for heating & cooling
• After a year of occupancy these homes are using 70% less energy than similar homes constructed five years earlier

O'Neil Pennoyer Architects developed this co-housing community which consists of 29 residential units, a common house, professional offices and a working farm. A district heating system with biomass boilers provides a shared heating resource to each building in the development. The homes are registered for LEED Platinum rating.

Design Features:

• High performance building enclosure
• Wood pellet boiler central heating plant
• Drain water heat recovery
• Heat recovery ventilation

A.G. Architects designed this renovation and addition to an existing medical office building totaling 10,000 square feet.

JSA, Inc. designed this 8,000 square foot addition to an existing medical office building.

This 15,000 square foot medical office building, developed by JSA, Inc., is representative of several of our projects in the healthcare sector. We typically provide building envelope consulting for these types of projects as well.

Design Features:

• High performance building enclosure
• Energy recovery ventilation system
• Variable frequency drives on main pumps
• High efficiency condensing boilers
• Solar thermal domestic hot water heating
• Low flow plumbing fixtures

This 12,000 square foot medical office building, architect - JSA, Inc., client - Frisbie Memorial Hospital, Rochester, NH, was completed Fall 2008. An integrated design process with architect, structural engineer and the owner allowed for a high performance building envelope and downsized mechanical systems to be achieved.

Design Features:

• Continuous insulation outside of structure on all enclosure assembly surfaces
• THERM modeling software used to minimize thermal bridging in building assemblies
• Optimized domestic hot water distribution system

With its recent designation as an Eco-Municipality, the City of Portsmouth has been pursuing strong sustainability goals on all of its municipal projects. The new 4 million gallon per day water treatment plant is no exception. We were retained by Hazen and Sawyer , the primary design firm, to design the HVAC and plumbing systems and to consult on sustainable design opportunities. Construction of this facility is currently underway.

Design Features:

• Water source heat pumps for heating and cooling that utilize the plant’s process water as a heat source/sink
• High efficiency condensing boiler
• Compartmentalization of spaces and air sealing measurement and verification
• Insulation of large water process tanks and process piping
• Solar thermal water heating system for emergency showers and locker rooms
• Energy recovery ventilation

Built in 1878 and designated an American Treasure by the US Senate, The Music Hall is the oldest theater in New Hampshire. We have been honored to design the modernization of the mechanical systems and continue to assist with ongoing renovation efforts for this historic building.

Design Features:

• High efficiency condensing boilers
• Energy recovery ventilation
• Low flow plumbing fixtures and waterless urinals

Recently completed, the project entailed converting a non-historic barn into a 3-story annex to the Franklin Pierce Manse. This conversion, developed by C.N. Carley and Associates, included the design of the lower two floors to have environmental systems suitable for storage and display of historical artifacts, with the top floor serving as the Library’s office space.

Design Features:

• High performance enclosure to assist with control of relative humidity in conservations spaces
• A control system designed to maintain stable RH levels to preserve paper artifacts
• Simple and conventional heating, dehumidification and air-conditioning equipment use to meeting the environmental control requirements within a limited budget

This 16,000 square foot wellness and fitness facility with a 5,500 square foot natatorium underwent comprehensive renovations, with primary project goals of durability and reducing facility energy consumption.

Design Features:

• Ventilation based dehumidification system
• Energy recovery ventilation system
• Drain water heat recovery system
• High efficiency condensing boilers