Hunnewell Elementary SchoolSD HVAC System SelectionJune 25, 2020
Hunnewell Elementary School
Mechanical System Selection Overview
5 system options studied … 2 systems shortlisted
Energy Modeling and Life Cycle Cost Analysis
Pro/Con analysis
Base System VRF System + DOAS
Option 1 Displacement Ventilation + Radiant Floors + DOASwith Air-Cooled DX CHW/HW
Option 2 Displacement Ventilation + Radiant Floors + DOASwith Geothermal + CHW/HW
Option 3 Chilled Beams + DOASwith Geothermal + CHW/HW
Option 4 Displacement Ventilation + VRF + DOAS
Mechanical Systems
Mechanical Systems Base Option – VRF + DOAS
Mechanical Systems Option 4 – Displacement Ventilation + VRF + DOAS
Radiant Heat
Built-in shelving casework
Heavy duty cover
Radiant Ceiling panels
Mechanical Systems
Mechanical Systems
Hunnewell Elementary SchoolSD Construction Cost Estimate UpdateJune 25, 2020
HVAC system change of est. $2.8m has been factored in*
Refinements during SD
• Building area: Floor Plan development + $ 300k
• Site development + $ 1.5m
• Rubber flooring in lieu of Linoleum + $ 450k
• Foundation Waterproofing + $ 570k
• Schedule impacts due to COVID 19 + $ 500k
Total
$3,320,000
* Assumes VRF/Displacement Air type system
in lieu of Geothermal system
SD Construction Estimate is $2.4m above FS Estimate $45.06m:
• Straightening Café & Gymnasium Structure - $ 0
• Reduce Gross SF by +/-1,000 sf - $ 300k
• Remove 8 operable glazed walls and most sliding glazed doors - $ 500k
• Refine Sloped Roofs (use overhangs and clerestories) - $ 650k
• Reduce/simplify Site design scope - $ 500k
• Eliminate Foundation Waterproofing (awaiting final Geotech investigation results)- $ 550k
• Use Heat Mirror Glazing (at windows) in lieu of triple pane glazing - $ 200k
Total - $ 2,700,000
($300,000 below FS budget)
SD Construction Estimate is $2.4m above FS Estimate $45.06m:
Recommended VE items
Heat Mirror & Triple Glazing
Heat Mirror Film @ all Windows (0.22 assembly U-value – lower weight)
Triple Glazing Assembly: @ all Curtain Wall Units(0.22 assembly U-value)
Recommended VE reductions - $ 2,700,000
($300,000 below FS budget)
Recommended Value adds
• Laminated Glazing at Interior sidelights (in lieu of tempered) + $ 15k
• 4 Clerestory skylights + $ 50k
• Terrazzo flooring at Cafeteria space + $ 100k
• Outdoor Learning classroom @ low roof + $ 75k
• Hybrid Structure (wood roof structure at Café, Media Center, Lobby and Music) + $ 400k
• COVID 19 Schedule Impacts + $ 500k
Total + $ 1,140,000
Increase of + $ 940,000 to FS Construction Budget
Recommended SD Construction Budget: $ 46,000,000
SD Construction Estimate is $2.4m above FS Estimate $45.06m:
DD Value Engineering Goals:
• Water Softening System - $ 70k
• Reduce Roof Screening - $ 55k
• Eliminate Gymnasium divider curtain - $ 25k
Total
- $ 150k
Linoleum in lieu of Rubber flooring: - $ 450k
Not recommended by FMD
Hunnewell Elementary SchoolSD Construction Cost Estimate UpdateDiscussion
Hunnewell Elementary SchoolSD Project Cost & Schedule UpdateJune 25, 2020
Construction Manager Interviews
Anticipated proposals and interviews for the CM Selection Process:*
1. Shawmut Design & Construction
2. Gilbane Building Group
3. W.T. Rich Co.
4. Agostini Construction
* Consigli Co. has withdrawn from the process.
CM Procurement Schedule
• Finalize CM interview questions 6/25
• Construction Manager RFP proposals due 6/26
• CM Prequal Comm review meeting week of 7/6
• Construction Manager Interviews evenings of 7/15 & 7/16
• Construction Manager award 7/20 – 7/31
Schedule Milestone Update
• SD Value Engineering stage 4/24 – 6/18
• Set Schematic Design Construction Budget target 6/25 PBC Mtg – (Note: a few qualifiers to be confirmed after CM completes SD estimate)
• File Project of Significant Impact (PSI) with Town Permitting Authorities on 7/13
• Review FFE & Technology Budget and updated Total Project Budget at 7/23 PBC mtg.
• Start Design Development Phase 8/17
Hunnewell Elementary SchoolThank-YouJune 25, 2020