RTFs Revised Scope for Hastings ES RFS 1 16 20.pdf

January 16, 2020

Westborough, Massachusetts School Department

REQUEST FOR PROPOSALS - HASTINGS ELEMENTARY SCHOOL - HVAC REPLACEMENT PROJECT

Please be advised of the revised scope of work for the HVAC Replacement Project – Request for Proposals Advertisement as follows:

The Westborough School Dept. has recently completed the replacement of the geothermal heat pump system.

The new system provides chilled water at 44 degrees F. (cooling) and hot water at 130 degrees F. (heating).

We are asking interested engineering firms that are familiar with geothermal systems to submit a proposal to design the replacement of HVAC equipment beyond the central geothermal heat pump system.

The System DESIGN should include the following items based upon a Life Cycle Analysis performed on April 21, 2017 by Garcia, Galuska & DeSousa (GGD).

Removal of all existing HVAC equipment including electrical heating elements. Existing geothermal plan and related appurtenances within the mechanical room shall remain.

Variable air volume hot water/cooling coil air handling unit, supply and exhaust fans, energy recovery and sensible only wheels providing mixed-air ventilation and air conditioning overhead distribution serving the classroom areas

Variable air volume boxes with demand ventilation and temperature control to modulate airflow based on occupancy and space heating/cooling demand for all occupied areas

Overhead fiberglass insulated supply air ductwork distribution systems connecting to ceiling mounted diffusers and fully ducted return air ductwork systems

Chilled/hot water radiant panels along exterior walls

Multiple two-pipe heating and cooling induction units serving the administration and library areas

Primary air ducted directly to induction units

100% outside air unit with hot water/cooling coil, supply and exhaust fans, energy recovery and sensible only wheels providing tempered ventilation to the induction units in the administration and media center areas

Variable air volume hot water/cooling coil air handling units, supply and exhaust fans with energy recovery and sensible only wheels and demand control ventilation providing mixed-air ventilation and air conditioning overhead distribution serving the cafetorium and gym areas

Make-up air handling unit and variable air volume exhaust air fan system serving the kitchen

Limited use of hot water radiation and unit heaters

Two-pipe heating/cooling piping system serving all air handling units, radiant panels, and induction units

Direct digital controls throughout (Proprietary system – Johnson Controls)

Provide split direct expansion cooling coil with associated outdoor air-cooled condenser and interconnecting refrigerant piping for each air handling unit. This is in addition to the chilled water coil.

This direct expansion cooling coil will provide cooling for the system during the swing months of the year when outdoor temperatures require some spaces to be in heating while others in cooling. This will provide diversity in the heat pump two-pipe changeover system that is currently installed and remaining in place.

PLEASE NOTE THE FOLLOWING IMPORTANT DATES AND DEADLINES:

A Mandatory Project Site Walk-Down for interested Bidders will be conducted at the Westborough Hastings Elementary School at 10 AM on Tuesday, 4 February 2020. Interested Bidders should plan to meet in the Front Lobby of the Hastings Elementary School and to sign-in accordingly at the following address:

Hastings Elementary School 111 East Main Street Westborough, MA 01581

Questions shall be directed to Robert T. Ferguson, Esq., at fergusonr@westboroughk12.org

Any and all Questions submitted will be distributed to the Interested Bidders with the corresponding Answers.

Bids will be due no later than by 12 Noon on Tuesday, 11 February 2020.

Bid Packages shall be submitted in Hard Copy Triplicate and directed to the attention of Irene Oliver, Director of Finance & Administration, C/O Paige Thomas, at the following address:

Westborough Public Schools 45 West Main Street 3rd Floor, Finance Department Westborough, MA 01581 Attn: Irene Oliver, C/O Paige Thomas

Westborough Public Schools reserves the right to reject any and all bids, to waive any informality, and to make an Award as may be in the best interest of the Town.

mailto:fergusonr@westboroughk12.org