1. REU Luncheon Presentation on
Locating UW – CAES: Basics
Gabriel E. Colón Reyes, REU Undergraduate Student
Universidad de Puerto Rico, Mayagüez
University of Massachusetts, Amherst
Thursday, July 2nd, 2015

2. UW – CAES: How it works
• Hydrostor Plant

3. UW – CAES Potential
• According to First Law of Thermo, the general
open system rate balance is:
• For an adiabatic model, this turns into:
WC
P0DV
=
g
g -1
b 1- b
g-1
g
æ
è
çç
ö
ø
÷÷
Q
·
Net,In -W
·
Shaft,NetOut =
d
dt
erdV + m
·
OUT
å
cv
ò
P
r
+e
æ
è
ç
ö
ø
÷- m
· P
r
+e
æ
è
ç
ö
ø
÷
IN
å

4. • WC – Work input into compressor
• P0 – Atmospheric Pressure
• ΔV – Change in Volume
• ϒ – Specific Heat Ratio (CP/CV)
• β – Pressure Ratio (P/P0)
• Presents Energy Storage Capacity as a
Function of Depth
WC
P0DV
=
g
g -1
b 1- b
g-1
g
æ
è
çç
ö
ø
÷÷

6. 9OSES 2014
Results – GoM Storage Density Map
1 2 3 4 5
1
2
3
4
5
6
7
7
AREA = 75,775 sq.km
Class Depth
1 0-50m
2 50-100m
3 100-150m
4 150-200m
5 200-250m
6 250-300m
7 >300m
(max 375)
6
4
5
Region Distance
1 0-50km
2 50-100km
3 100-150km
4 150-200km
5 200-250km
ME
MA
NH

8. Putting it into Context
• Avg household consumes 1.26 kWhr/hr
• 23 TWhr = 18 billion homes for one hour =
750 million homes for one day = 2 million
homes for a year!!!!!!!
• GoM has 110 TWhr potential = Running entire
US Load for 10 days

9. Location Parameters
• Environmental
• Social
• Engineering

10. Environmental Parameters
• Fish Habitat
• Fish Nurseries
• Fish Spawning Areas
• Whale Migration Patterns

11. Social Parameters
• Emergency Service Lanes
• Commercial Boat Lanes
• Fishing Areas
• Recreational Uses

12. Engineering Parameters
• Storage Potential
• Staging Port Proximity
• Distance to Wind Energy Area
• Distance to Substation
• Soil Structure
• UW Terrain Slope

13. Methodology
• Apply Layers
• Weigh Each Parameter
• Determine Location

14. Example
• Marine Cadastre
• 2011 Vessel Density: Fishing
• Critical Habitat Designations
• Ports
• Bathymetric Contours

15. References
• http://millicentmedia.com/2012/09/11/cuttin
g-costs-for-offshore-wind-farms/
• http://www.arcternventures.com/portfolio/hy
drostor/
• “Evaluating the Underwater Compressed Air
Energy Storage in the Gulf of Maine”, Carson
Pete, Presentation and Research Paper
• http://www.eia.gov/tools/faqs/faq.cfm?id=97
&t=3

16. THANK YOU FOR YOUR ATTENTION!!!
Questions????