Benjamin Banneker Elementary Milford, DE Michelle M. Baldwin - - PowerPoint PPT Presentation
Benjamin Banneker Elementary Milford, DE Michelle M. Baldwin Mechanical Option Presentation Outline Existing Conditions Existing Mechanical System Analysis of Mechanical Redesign Dedicated Outdoor Air System Radiant Panels
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Existing Conditions Existing Mechanical System Analysis of Mechanical Redesign Dedicated Outdoor Air System Radiant Panels Fire Protection Economic Analysis Lighting Conclusions
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Project Team
Owner: Milford School District Mechanical: Furlow Associates Electrical: Carew Associates Structural: Baker Ingram Associates General Contractor: Conventional Builders
Building Cost: $8,195,200 Building Size: 64,600 ft2 Dates of Construction
Start: January 2002 Finish: October 2003
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Architecture
Building Exterior
Decorative concrete block with a stacked bond Prefinished metal panels Metal awnings
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
First Floor
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Second Floor
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Electrical
750 KVA transformer 208/120 V, 3 phase, 4 wire 70 A emergency generator
Classroom Lighting
Direct/indirect fluorescent suspended fixtures
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Structural
Structural steel joists and girders Non-composite floor system 14’ floor to floor height 10’ ceiling height
Construction Management
New school built on the same site as existing
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Dedicated Outdoor Air System
Two Energy Recovery Units (ERU)
Six Roof-top units Air-cooled chiller Fire-Tube Boilers Two-Pipe System
Unit Ventilators Fan Coil Units Fin-Tube Radiation
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Supply Air Temp: 75˚F Terminal unit supply air temp:
Cooling – 55˚F Heating – 150˚F
Space dew point temp: 57˚F Space relative humidity: 53% Latent and Sensible load on the terminal
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Remove the existing terminal units Add radiant panels Decouple the Sensible and Latent Loads
Decrease the supply air temperature
Resize the cooling coil
Reduce the dew point temperature
Determine radiant panel supply water temperature
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Noise in Classrooms
Decrease in ability to learn as background
HVAC systems are the major source of
Classroom rating – NC 30dB Unit Ventilators – NC 45dB Typical classroom with unit ventilators –
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
1. Outdoor air inlet 2. Enthalpy Wheel 3. Cooling and Heating Coils
100% Outdoor Air 15 cfm/person Energy Recovered from the return air stream
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
93˚F
14˚F
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
ERU supply temperature reduced from
Resized Cooling Coil
Relative humidity reduced from 53% to
Dew point temperature reduced from
Reheat Coils
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Invensys RCU-166
Piping Connection Panel Shape
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Room Air Temperature °F 75 Temperature Water Inlet °F 56 Temperature Water Outlet °F 59 Total Ceiling Area in ft2 800 Total RCU Area in ft2 per Module 10.40 Room Ceiling Height ft 8.50 Total Cooling Capacity BTUH/ft2 Active Area 53.41 Water Flow RCU per Module in gal/min 0.37 Total Number of Panels 844
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Thermostat control
Heating Coils Radiant Panels
Condensation Risk
Operable windows Outdoor humidity
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Integration of sprinkler piping and
Normal Flow control
Chilled water supplied to radiant panels
Fire Flow control
Water supplied directly to sprinkler heads
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
First Cost Analysis
$6,634 $39,000 $2,760 $111,300 Total Condensate Piping Fan-Coil Units Fin-Tube Radiators Unit Ventilators
$900 $26,498 $21,000 $11,210 $114,109 Total Pumps Valves Reheat Coils Piping Radiant Panels
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Initial System Total Cost: $69,414
22.9% Air System Fans 22.6% Cooling 2.2% Heating 1.9% Pumps 29.5% Lights 21.0% Electric Equipment 22.9% Air System Fans 22.6% Cooling 2.2% Heating 1.9% Pumps 29.5% Lights 21.0% Electric Equipment
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Redesigned System Total Cost: $ 65,292
15.6% Air System Fans 23.2% Cooling 4.0% Heating 3.6% Pumps 31.4% Lights 22.3% Electric Equipment 15.6% Air System Fans 23.2% Cooling 4.0% Heating 3.6% Pumps 31.4% Lights 22.3% Electric Equipment
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
First Cost Analysis Summary
$14,024 Additional Cost $1,196,699 Total $173,717 Plus $159,693 Minus $1,182,675 Mechanical Cost
Energy Analysis Summary
The redesigned system is $4,122 less
Payback period is 3.4 years
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
30 fc on task surface 1.5 W/ft2 3 types of light fixtures considered
Direct/Indirect fluorescent suspended fixture Direct recessed fluorescent fixture Direct fluorescent suspended fixture
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
48.6 fc 1.07 W/ft2
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
45.6 fc 0.89 W/ft2
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
40.1 fc 1.31 W/ft2
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Direct fluorescent suspended fixtures 40.1 fc > 30 fc No shadows 1.31 W/ft2 < 1.5 W/ft2
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Advantages
Lower Annual Energy Cost Short Payback Period Increased System Control Flexibility Increased Floor Area Decreased Background Noise
Increased Comfort Increased Learning Ability
Disadvantages
More Complicated Controls Higher First Cost
Benjamin Banneker Elementary AE Senior Thesis Spring 2003 Michelle Baldwin Mechanical Option
Furlow Associates
AE Department Friends & Family