SLIDE 1
BCSD HVAC System Analysis
BCSD HVAC System Analysis
Berkeley County School District HVAC System Analysis Seth - - PowerPoint PPT Presentation
Berkeley County School District HVAC System Analysis Seth - - PowerPoint PPT Presentation
Berkeley County School District HVAC System Analysis Seth Spangler, PE, LEED AP, BEMP BCSD HVAC System Analysis Introduction Seth Spangler is a licensed Professional Engineer and American Society of Heating, Refrigeration and
SLIDE 2
SLIDE 3
BCSD HVAC System Analysis
Purpose
» BCSD commissioned RMF to conduct a study of various HVAC systems with a focus on
- Equipment first (installed) cost
- Yearly maintenance
- Equipment replacement
- Annual energy costs
- Ease of maintenance
» Results will guide BCSD to select the most cost effective HVAC system over a 20 year period of time » The most cost effective HVAC system will be used in BCSD’s future schools
SLIDE 4
BCSD HVAC System Analysis
What is Energy Modeling?
SLIDE 5
BCSD HVAC System Analysis
Weather
» The project was modeled to be located at the site of the Nexton Elementary School, located in Berkeley County, South Carolina, which is in ASHRAE Zone 3a (warm, humid climate) » The electrical rate is modeled upon Berkeley Electric Co-op Rate 30 utility structure
SLIDE 6
BCSD HVAC System Analysis
Building Architecture
SLIDE 7
BCSD HVAC System Analysis
Modeling Data
SLIDE 8
BCSD HVAC System Analysis
HVAC Equipment
SLIDE 9
BCSD HVAC System Analysis
What are the Results?
SLIDE 10
BCSD HVAC System Analysis
Life Cycle Costs
» Capital Project Costs
- Construction Costs
- Soft Costs
» Annual Costs
- Energy Usage
- Maintenance
SLIDE 11
BCSD HVAC System Analysis
Results
ENERGY COSTS: System Electric Usage (kW/h) Natural Gas Usage (Therm) Total Charge ($) System 1: Fan Coil Unit w/Ice Storage 627 , 667 9,63 2 $ 157,452 System 2: Fan Coil Unit w/o Ice Storage 498,767 9,630 $1 45 , 972 System 3: Fan Coil Unit w/Turbocor Chiller 405 , 799 9,630 $1 37 , 09 7 System 4: Water Source Heat Pump 383 , 231 6 $1 20 , 871 LIFE CYCLE COSTS: System Capital Cost ($) Firs t Year Annual Cost ($) Life Cycle Cost ($) System 1: Fan Coil Unit w/Ice Storage $ 2,523,940 $ 165,359 $5,423,740 System 2: Fan Coil Unit w/o Ice Storage $ 2,371,356 $ 153,380 $5,058,456 System 3: Fan Coil Unit w/Turbocor Chiller $ 2,490,496 $ 144,504 $5,018,896 System 4: Water Source Heat Pump $ 1,748,630 $ 126,772 $ 4,362,030
SLIDE 12
BCSD HVAC System Analysis
Humidity Control for Water Source Heat Pump Systems
» Dedicated Outside Air System (DOAS) should be provided to separate the space sensible (heat from lights, computers, etc.) and latent (moisture from occupants) loads » DOAS will limit occupied space relative humidity to the recommended maximum 50% » DOAS would be able to accurately maintain the building at net positive pressure, with respect to outdoors during all hours of dehumidification, and provide the necessary make- up air
SLIDE 13
BCSD HVAC System Analysis
Humidity Control for Water Source Heat Pump Systems
SLIDE 14
BCSD HVAC System Analysis