House of Worship: Presents 21st-Century Upgrades to a Mid-20th Century House of Worship
A Synagogue in Malden, Massachusetts wanted to reduce greenhouse gas (GHG) emissions, replace end-of-life equipment, improve comfort and reduce operating cost. Achieve Renewable Energy, LLC., is proud to have met these goals with a Ground Source Heat Pump (GSHP) installation that is worthy of being the 2020 Top Job.
The historic mill building was heated via a fuel oil-fired steam system. HVAC upgrade options were:
It was originally heated via a fuel oil-fired boiler that supplied hydronic air coils in one 40-ton and two-7.5 ton, single-speed air handler units (AHUs). The burner in the boiler was converted from fuel oil to natural gas. A large chiller that provided cold water to the AHUs for air conditioning. The building had two heating and cooling zones.
The house of worship has high occupancy during the weekends, religious holidays or events and low occupancy other times. The HVAC system supplied fresh air via mechanical space wall openings directly to the outside operating at nearly 100% fresh air. This approach left the building open to the outside. Cold air from the mechanical spaces spread throughout the building via an open stairwell. which resulted in very cold internal temperatures during the heating season.
To support design, Achieve tested Formation Thermal Conductivity and completed a Manual N Heating/Cooling Load Analysis. We used the data to design a customized GSHP system. The GSHP conversion consisted of thirteen variable-speed GSHPs supplying 16 comfort zones.
The Director of the Synagogue has received many positive comments regarding comfort. Utility cost has been reduced as have GHG emissions have also been significantly reduced.