HomeMy WebLinkAboutREVI#___Re vision consulting, LLC
5115 11th Ave
Sacramento, CA 95820
October 6, 2008
Brian Hirsch, Ph.D.
Energy Program Manager
Yukon River Inter-Tribal Watershed Council
Dear Brian,
Re vision is excited about the opportunity to work with you on the Ruby Hydrokinetic
project and will support the project by providing technical consulting and support
services throughout the project.
Re vision consulting, LLC has played a pivotal role in the development of marine
hydrokinetic programs in the US and abroad, most recently providing a technical lead
role in EPRI’s River In-Stream program which included a collaborative program funded
by many Alaskan Stakeholders. It will leverage this experience and know-how to assist
in making the Ruby Hydrokinetic project a success. Re vision will provide these services
in close collaboration with Idaho Power that will provide their expertise in practical
aspects of river measurements and EPRI.
We are looking forward to be a part of this important project.
Thank you,
Mirko Previsic
President – re vision consulting, LLC
Work Statement and Cost Proposal
Task 1: Establishing velocity distributions at Ruby Project Site and identify optimal
turbine Placement
Power density at a RISEC project site increases to the 3 rd power of velocity. With other
words, small changes in velocity will create big differences power density and hence
machine power output. Moving the device slightly into a faster moving spot may provide
significant improvements in power output. Seasonal variations in flow volume further
provide a temporal variation in velocities at the site. Unfortunately only the discharge
rate for the site is known from historical USGS discharge records. In order to
characterize this velocity variability in time and space, a ADCP (Acoustic Doppler
Current Profiler) survey will be carried out to provide a velocity distribution map of the
local river stretch of interest. Based on the velocity profiles, which will include multiple
transect measurements, river slope measurements and a survey of the river bank, a
relationship will be established between discharge rate and velocity. Based on that
location-specific correlation function a velocity frequency distribution can be established
to be used in turbine performance assessments.
Re vision will establish the specifications for the type of data to be collected which will
allow for the competitive selection of a surveyor. The surveyor will collect the data and
send it back to re vision for post processing and integration into existing turbine
performance models. Based on this data, re vision will determine the optimal turbine
placement in Ruby and establish a frequency distribution of velocities based on long-term
discharge rates established for the site by USGS.
Cost
Establishing measurement specifications for subsequent competitive solicitation
-Principal Engineer: 30 hours @ $140/hour $4,200
-Water Resources Engineer: 10 hours @ $150/hour $1,500
Post Processing of data
-Principal Engineer: 60 hours @ $140/hour $8,400
-Water Resources Engineer: 10 hours @ $150/hour $1,500
Short Report
-Principal Engineer: 20 hours @ $140/hour $2,800
Management and Coordination (15%) $3,474
Total Cost for Subtask $21,874
Task 2: Establishing a integrated turbine model
Integrated modeling is an approach that allows a rapid evaluation of different generation
options and design alternatives. The basic concept is that changing one design aspect
will have a ripple effect in terms of both cost and design to other components within the
overall system. The following displays the elements of such an integrated model.
For the purpose of this study the conceptual designs served as the foundation to establish
cost estimates of the technology, which were then used in an established integrated
modeling framework.
Re vision has established integrated models for a wide range of emerging technology
options in River In-Stream, Tidal and wave energy conversion for a wide range of clients,
including EPRI, Chevron, California Energy Commission and Chevron. This established
parametric framework will be leveraged to model the RISEC technology used at the
Ruby site and evaluate potential project economics from a RISEC project. The primary
purpose of this task will be to identify what the critical cost drivers for this technology
are. In particular the project economics will be evaluated based on the influence of:
1.Device specific parameters, including rotor size, number of rotors etc.
2.Scale of deployment (number of units or power output)
3.Average Velocity or Power Density
Evaluating these parameters in a site and technology specific way, allows to draw
conclusions as to what type of site conditions will be required to make a project
economically competitive.
Cost
Modifying Parametric Model to match technology and site specific requirements
Principal Engineer: 100 hours @ $140/hour $14,000
Reporting
Principal Engineer: 40 hours @ $140/hour $5,600
Coordination (15%) $3,780
Total Task Cost $23,380