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Don Talend Turbine Efficiency Article

Turbine efficiency article in Distributed Energy magazine, by Don Talend

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November/December 2011
www.distributedenergy.com
Mandatory
Maintenance
THE BEST WAY TO GET THE
MOST OUT OF YOUR GENSET
ALSO IN THIS ISSUE:
Audits: Save Before You Start
Keep It Flexible With Turbines
40 • www.distributedenergy.com
I
n a Boston, MA, metropolitan
area that is experiencing both
considerable growth and an
evolving regulatory energy envi-
ronment, electric capacity will
need to increase one way or another in
the coming years. The Braintree Electric
Light Department (BELD) is choosing to
increase capacity in a forward-thinking
way by taking advantage of the benefits
that turbines can provide in
terms of boosting grid output.
Flexibility and expand-
ability are major potential
benefits of installing turbines
in power-production niches
such as this. So are energy ef-
ficiency and low emissions. As
utility managers try to balance
an easing of the burden on
regional electrical grids with
finite financial resources, these
prime movers are becoming a
viable option in many cases.
In late 2008 the BELD
installed a Rolls Royce genset
consisting of two gas turbines
as part of a $110 million com-
bined cycle plant repowering
project. The genset replaces
a 32-year-old oil and natural
gas-fueled combined-cycle
gas turbine and is designed to
meet the growing energy needs
of the ISO-New England grid by supplying
116 MW of electrical power during peak
demand. Montgomery Energy Partners LP,
Houston, TX, operates the new Thomas A.
Watson Generating Station in Braintree,
MA, which made power commercially
available starting in June 2009.
The two new Trent 60 units will pro-
vide to the ISO New England grid at times
of peak demand by supplying electricity
to BELD’s roughly 12,500 residential and
2,500 commercial customers. ISO New
England had forecast that the region will
need 4,030 MW of additional capacity by
2015. Not adding output capacity would
mean that BELD would have to purchase
power on the open market, likely causing
rates to increase.A region-wide challenge
is the fact that several antiquated plants
in the New England area, including a
nuclear plant, will be shut down in
the next few years. So more output
capacity will be needed in the
New England region in
coming years anyway.
BELD sought a prime mover source
that, more than anything else, provided
flexibility in varying peak-power situa-
tions. The Trent 60 that was eventually
selected generates up to 64 MW in simple
cycle service at 42% efficiency while ad-
hering to 25 ppm nitrogen oxides emission
limits. It is engineered to go from a cold
start to full power in less than 10 minutes
and thus suit peaking and flexible power
generation markets. This design allows it
add power to the grid very rapidly to com-
pensate for the fluctuations and variability
of various sources of power, including
renewable sources. Trent 60-powered Wet
Low Emissions (WLE)
generating sets run on
either gas or liquid fuel
and generate power
outputs of up to 58 MW
each. Running either
separately or in tandem,
the turbines can produce
25 to 115 MW—a wide
output range.
BELD considered
other“frame unit”tur-
bines that were designed
for combined-cycle
operating mode, but
the Trent 60s—which
are autoderivative, i.e.,
designed initially for use
by aircraft—provided
more flexibility, says Bill
Bottiggi, BELD’s general manager.With
frame units,“the whole envelope is more
efficient than an autoderivative turbine,
but also much more complex and less
flexible,”he says.“The key to us was flex-
ibility. ISO New England sets the rules for
how plants are reimbursed, when plants
run, capacity payments versus energy
payments, and they’re always changing the
rules, they’re always tinkering.We wanted
something that would still have value
regardless of what decisions the ISO New
England makes.We could put a combined
cycle plant in and get more efficiency, but
then we’d lose flexibility. ISO New England
Keeping It Flexible
Reliable operation is of concern
with any equipment that is tied to
mission-critical functions, such as
a turbine that powers an uninter-
ruptible power supply. The ben-
efits of turbine inlet cooling are
offered as a possibility to consider
for increasing turbine reliability.
During high ambient
temperature conditions, load
demand may force operators to
continually run the engine at its
upper temperature limits, notes
Dave Voeller, president of Everest
Sciences Corporation, a provider
of turbine generator inlet cooling
solutions.Turbine inlet cooling
allows the operator to back off of
these limits, reducing the number
of hours running at maximum
temperature limits while still
meeting load requirements.
Some operators experi-
ence frequent shutdowns at high
ambient temperatures and high
ambient loads due to the turbine
exceeding its temperature limits.
High costs are associated with
the lost output while the engine
is shut down of course. Each
unplanned shutdown also results
in an unnecessary restart cycle,
which, over time, also increases
maintenance costs.Turbine inlet
cooling reduces the incidence of
these events,Voeller concludes.
Inlet Cooling and Reliable Operation
Advancements in turbines allow plant managers to increase output
incrementally in some power configurations, for optimal power utilization.
BY DON TALEND
Syracuse University’s
12,000-square-foot
Green Data Center,
which is on track for
LEED Silver certification.
Capstone
Turbine
Corp.
42 • www.distributedenergy.com
could change the rules, and we’d make
sure we have value regardless.”
Another highly sought-after attribute
that BELD sought from additional capac-
ity was redundancy.“That was important
to us,”recalls Bottiggi.“With any power
plant, you’re always going to have technical
issues.We like the idea of having two ma-
chines in case one has an outage or trips or
something like that—then we would still
have half the output.”Obviously, having
two identical turbine units that can oper-
ate independently of each other provides
both redundancy and flexibility.
Bottiggi agrees that being the first to
utilize a new turbine model in the United
States normally would have caused a little
bit of trepidation. But a visit to an early
North American adopter of the Trent
60—Whitby Cogeneration in Whitby, On-
tario, Canada, which had a unit installed to
power a 51.2-MW baseload cogeneration
plant in 1998—allowed BELD to deter-
mine how the model was performing and
how well the manufacturer backed up its
product.According to Bottiggi, the manu-
facturer provided Whitby Cogeneration
with a great deal of support throughout
the installation and early operational pro-
cesses, and a strong warranty gave BELD a
high level of confidence in the turbines.
Having operated the new genset for a
couple of years, BELD management is very
confident that the new genset is operat-
ing more cost-effectively than its existing
combined-cycle plant. For example, BELD
was able to lower its electricity rates by 3/4
of a cent per kilowatt-hour immediately.
The fact that the Trent 60 units operate
between 4 and 12 hours in a typical day
allows BELD to reap substantial savings.
“There are days when we have saved a
significant amount of money on energy,”
points out Bottiggi.
He explains that, on July 21 of this
year when ambient temperatures exceeded
100°F, the new genset allowed BELD to
produce its own power at about 1/10 of
what it would have cost to buy it.“If we
didn’t have our own power plant and we
were left exposed to real-time market
pricing, we would have been paying $700
a megawatt-hour for electricity—we were
producing it at $75 per megawatt-hour,”
he concludes.
New Turbines Suit Syracuse
A recent article in Distributed Energy
(“Power Without Pause,” July/August)
detailed the uninterruptible power
supply system at Syracuse University’s
12,000-square-foot Green Data Center
(GDC). Capstone Turbine Corporation
—the supplier of the microturbines
that power the system—and Syracuse
provided the magazine with further
insight into why Capstone’s Hybrid UPS
MicroTurbines were the right fit for
the $12.4 million project completed in
November 2009.
Syracuse’s UPS is the first onsite pow-
er system to integrate“clean-and-green”
C65 (65-kW) microturbines directly with
a dual-conversion UPS to provide power
for mission-critical loads. Substantial
energy savings is the major reason why
the GDC, which is on track for a Silver
certification under the US Green Build-
ing Council’s Leadership in Energy and
Environmental Design (LEED) program,
is a landmark project in the use of micro-
turbines as a distributed generation power
source. Microturbines are a major factor in
a UPS-combined cooling, heat, and power
(CCHP) system designed to achieve a 50%
energy reduction compared with a data
center using traditional power sources.
The natural gas-fueled Capstone
microturbines are at the heart of the data
center’s electrical trigeneration system.
Despite having patented the design years
ago, this project is actually the first time
that Capstone put the units into produc-
tion form. Twelve units were installed in
the facility and a maximum of 10 are used
at any given time to power the servers and
equipment. Kevin Noble, manager of en-
gineering at Syracuse, points out that the
units’low-emissions design eliminated the
need for a permit, although the emission
sources are inventoried.Additionally, it
was possible to mount the microturbines
on concrete pads outside of the facility,
and they produce virtually no vibration.
“We talked to Capstone and realized
that they had an inverter and batter-
ies in one version of the standard C65,”
recalls Noble.“We said:‘We are building a
data center and need a UPS. It looks like
this is most of one. Can we combine the
functionality of trigeneration with a UPS?’
For related articles:
www.distributedenergy.com/turbine
44 • www.distributedenergy.com
Capstone informed us that they already
had the concept patented but had never
developed it. In February 2009, they
agreed to develop a product for this proj-
ect, and delivered 12 units in September
of that year. We just added batteries and
avoided the cost of a discrete UPS.”
A key element in the facility’s energy
efficiency is a separate “High Efficiency
Mode” of operation. In this mode, the
microturbine is turned on and supplies
power to the critical alternating current
(AC) bus through an inverter called a
Load Control Module (LCM). In contrast
to a typical data center that converts AC
power from the utility’s electrical grid to
direct current (DC) and then back to AC
to power the servers, these microturbines
can generate any combination of AC and
DC power without a loss of power that
typically occurs during transmission
and conversion. The Hybrid UPS design
does not require that the microturbine
produce exactly the amount of power
required by the critical load because a
grid load control module (GLCM) allows
power to flow out to the non-critical part
of the distribution system. Alternatively,
the GLCM can pull power in from the
utility as needed to match critical load
requirements.
The cooling component of the sys-
tem is particularly efficient because it uses
“a Double-Effect Absorption Chiller.”
The microturbines produce very clean
exhaust heat that is diverted to two 150-
ton Thermax absorption chillers. More
conventional absorption chillers would
convert waste heat from the microtur-
bines to hot water used to make chilled
water. But this conventional process
utilizes hot water that reaches a relatively
low temperature of about 220°F. The
Thermax chillers, in contrast, can directly
utilize the microturbines’ clean combus-
tion product, which is nearly two-and-a-
half times hotter, and convert it to chilled
water. The result is much higher overall
efficiency of 85–90% than using utility
power and a traditional cooling system
with overall efficiency of around 50%.
The most consistent attribute of the
Hybrid UPS system at the Syracuse GDC
is flexibility. Depending on the facility’s
fluctuating power needs, the number of
microturbines producing dedicated pow-
er to it varies from 5 to 10. The remaining
microturbines produce extra power that
is shipped to the university power grid or
the building next door.
The operation of the system is
highly flexible. The Capstone turbine
generator operates at very high speeds
and produces a very high-frequency
AC. One inverter, a generator control
module (GCM) converts the high-
frequency AC to DC using a 760-V DC
Bus. Another converter, the LCM, then
converts the 760 V of DC into a 50- or
60-Hz AC with a 400- to 480-V nominal
three-phase voltage output for con-
nection to the critical loads. The LCM
maintains its frequency output in syn-
chronism with the electric utility mode.
A third converter, a load control module,
connects to the utility and allows the
facility to automatically either take
power from, or inject power back to, the
grid as conditions dictate. Due to this
flexibility, the output of the turbine can
be set to match the thermal load of the
CCHP system for maximum efficiency.
The GDC has the flexibility to produce
25 kW and get the other 25 kW from the
local utility, for example.
Noble points out that some precau-
tions have been taken to ensure the reli-
ability of this first use of Capstone’s Hy-
brid UPS MicroTurbine.“We are deeply
indebted to our chief information officer,
Chris Sedore, for his encouragement of
this project and his help in managing the
risk associated with this level of innova-
tion, which is quite radical in the data
center world,” says Noble.“To deal with
the potential for failure, and to facilitate
maintenance, upgrades, and revisions
to the systems, we have two strategies in
place. The first is a completely redundant
power system right down to every piece
of IT equipment, as far as is practicable.
Our racks all have white and black power
cords for the a and b power systems,
and we regularly test this system. We can
completely drop one side, and no critical
IT processes are significantly affected at
all. The second builds on the fact that
the load side inverters are synched to the
grid. We have closed-transition transfer
switches and can easily and seamlessly
move either side from the microturbines
to the grid at will.”
From Aircraft to Power
Generation
Converting turbine engine technology
that was originally designed for the avia-
tion industry to non-aviation applica-
tions is inherently innovative. Marine
Turbine Technologies, LLC (MTT) has
recently developed several new applica-
tions for turbines.
The 250-C20B/J model turbine, the
cornerstone of the Rolls-Royce Model 250
engine line, recently has been improved
with a new first-stage turbine nozzle
material designed to extend the life of the
component while maintaining engine
performance. Gearbox lip-seals and shaft
journals have also been redesigned to
reduce oil consumption.
MTT also recently entered the por-
table generator market by targeting small
distributed energy applications with two
lightweight portable generator products.
A Rolls-Royce Model 250 helicopter gas
turbine engine has been selected to power
a lightweight high-speed alternator that
provides 250 kW in a small footprint
package. MTT is working with an inter-
national manufacturer that specializes in
high-speed, lightweight alternators on the
development of the product. Targeted first
deliveries are forecasted for mid-2012. In
addition, MTT has selected a Honeywell
(Lycoming) T53-701/13B Helicopter Gas
Turbine Engine to power a 1-MW por-
table power generator package. The pro-
gram is in the early stages of development
and a natural gas fuel system is currently
the top priority. The targeted first delivery
is mid- to late 2012.
In another application, the light-
weight, portable 250-kW MTT Model 250
Series II can be transported by air, land
or sea to bring reliable power supply to
remote sites by incorporating its own fuel
and oil supply and support systems. The
generator is powered by Rolls Royce’s R-R
Model 250 gas turbine engine.A modular
aluminum enclosure allows the opera-
tor to change out the turbine engine and
generator package modules individually,
a design intended to cause less downtime
and maintenance expense. The gas turbine
engine has been successfully demonstrated
using diesel fuels, jet fuels, and biodiesel
fuels, and liquid gas and natural gas will be
explored as alternative fuels. DE
Don Talend is a frequent contributor
to Distributed Energy.
Scan here to share
this article or read
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Don Talend Turbine Efficiency Article

  • 1. November/December 2011 www.distributedenergy.com Mandatory Maintenance THE BEST WAY TO GET THE MOST OUT OF YOUR GENSET ALSO IN THIS ISSUE: Audits: Save Before You Start Keep It Flexible With Turbines
  • 2. 40 • www.distributedenergy.com I n a Boston, MA, metropolitan area that is experiencing both considerable growth and an evolving regulatory energy envi- ronment, electric capacity will need to increase one way or another in the coming years. The Braintree Electric Light Department (BELD) is choosing to increase capacity in a forward-thinking way by taking advantage of the benefits that turbines can provide in terms of boosting grid output. Flexibility and expand- ability are major potential benefits of installing turbines in power-production niches such as this. So are energy ef- ficiency and low emissions. As utility managers try to balance an easing of the burden on regional electrical grids with finite financial resources, these prime movers are becoming a viable option in many cases. In late 2008 the BELD installed a Rolls Royce genset consisting of two gas turbines as part of a $110 million com- bined cycle plant repowering project. The genset replaces a 32-year-old oil and natural gas-fueled combined-cycle gas turbine and is designed to meet the growing energy needs of the ISO-New England grid by supplying 116 MW of electrical power during peak demand. Montgomery Energy Partners LP, Houston, TX, operates the new Thomas A. Watson Generating Station in Braintree, MA, which made power commercially available starting in June 2009. The two new Trent 60 units will pro- vide to the ISO New England grid at times of peak demand by supplying electricity to BELD’s roughly 12,500 residential and 2,500 commercial customers. ISO New England had forecast that the region will need 4,030 MW of additional capacity by 2015. Not adding output capacity would mean that BELD would have to purchase power on the open market, likely causing rates to increase.A region-wide challenge is the fact that several antiquated plants in the New England area, including a nuclear plant, will be shut down in the next few years. So more output capacity will be needed in the New England region in coming years anyway. BELD sought a prime mover source that, more than anything else, provided flexibility in varying peak-power situa- tions. The Trent 60 that was eventually selected generates up to 64 MW in simple cycle service at 42% efficiency while ad- hering to 25 ppm nitrogen oxides emission limits. It is engineered to go from a cold start to full power in less than 10 minutes and thus suit peaking and flexible power generation markets. This design allows it add power to the grid very rapidly to com- pensate for the fluctuations and variability of various sources of power, including renewable sources. Trent 60-powered Wet Low Emissions (WLE) generating sets run on either gas or liquid fuel and generate power outputs of up to 58 MW each. Running either separately or in tandem, the turbines can produce 25 to 115 MW—a wide output range. BELD considered other“frame unit”tur- bines that were designed for combined-cycle operating mode, but the Trent 60s—which are autoderivative, i.e., designed initially for use by aircraft—provided more flexibility, says Bill Bottiggi, BELD’s general manager.With frame units,“the whole envelope is more efficient than an autoderivative turbine, but also much more complex and less flexible,”he says.“The key to us was flex- ibility. ISO New England sets the rules for how plants are reimbursed, when plants run, capacity payments versus energy payments, and they’re always changing the rules, they’re always tinkering.We wanted something that would still have value regardless of what decisions the ISO New England makes.We could put a combined cycle plant in and get more efficiency, but then we’d lose flexibility. ISO New England Keeping It Flexible Reliable operation is of concern with any equipment that is tied to mission-critical functions, such as a turbine that powers an uninter- ruptible power supply. The ben- efits of turbine inlet cooling are offered as a possibility to consider for increasing turbine reliability. During high ambient temperature conditions, load demand may force operators to continually run the engine at its upper temperature limits, notes Dave Voeller, president of Everest Sciences Corporation, a provider of turbine generator inlet cooling solutions.Turbine inlet cooling allows the operator to back off of these limits, reducing the number of hours running at maximum temperature limits while still meeting load requirements. Some operators experi- ence frequent shutdowns at high ambient temperatures and high ambient loads due to the turbine exceeding its temperature limits. High costs are associated with the lost output while the engine is shut down of course. Each unplanned shutdown also results in an unnecessary restart cycle, which, over time, also increases maintenance costs.Turbine inlet cooling reduces the incidence of these events,Voeller concludes. Inlet Cooling and Reliable Operation Advancements in turbines allow plant managers to increase output incrementally in some power configurations, for optimal power utilization. BY DON TALEND Syracuse University’s 12,000-square-foot Green Data Center, which is on track for LEED Silver certification. Capstone Turbine Corp.
  • 3. 42 • www.distributedenergy.com could change the rules, and we’d make sure we have value regardless.” Another highly sought-after attribute that BELD sought from additional capac- ity was redundancy.“That was important to us,”recalls Bottiggi.“With any power plant, you’re always going to have technical issues.We like the idea of having two ma- chines in case one has an outage or trips or something like that—then we would still have half the output.”Obviously, having two identical turbine units that can oper- ate independently of each other provides both redundancy and flexibility. Bottiggi agrees that being the first to utilize a new turbine model in the United States normally would have caused a little bit of trepidation. But a visit to an early North American adopter of the Trent 60—Whitby Cogeneration in Whitby, On- tario, Canada, which had a unit installed to power a 51.2-MW baseload cogeneration plant in 1998—allowed BELD to deter- mine how the model was performing and how well the manufacturer backed up its product.According to Bottiggi, the manu- facturer provided Whitby Cogeneration with a great deal of support throughout the installation and early operational pro- cesses, and a strong warranty gave BELD a high level of confidence in the turbines. Having operated the new genset for a couple of years, BELD management is very confident that the new genset is operat- ing more cost-effectively than its existing combined-cycle plant. For example, BELD was able to lower its electricity rates by 3/4 of a cent per kilowatt-hour immediately. The fact that the Trent 60 units operate between 4 and 12 hours in a typical day allows BELD to reap substantial savings. “There are days when we have saved a significant amount of money on energy,” points out Bottiggi. He explains that, on July 21 of this year when ambient temperatures exceeded 100°F, the new genset allowed BELD to produce its own power at about 1/10 of what it would have cost to buy it.“If we didn’t have our own power plant and we were left exposed to real-time market pricing, we would have been paying $700 a megawatt-hour for electricity—we were producing it at $75 per megawatt-hour,” he concludes. New Turbines Suit Syracuse A recent article in Distributed Energy (“Power Without Pause,” July/August) detailed the uninterruptible power supply system at Syracuse University’s 12,000-square-foot Green Data Center (GDC). Capstone Turbine Corporation —the supplier of the microturbines that power the system—and Syracuse provided the magazine with further insight into why Capstone’s Hybrid UPS MicroTurbines were the right fit for the $12.4 million project completed in November 2009. Syracuse’s UPS is the first onsite pow- er system to integrate“clean-and-green” C65 (65-kW) microturbines directly with a dual-conversion UPS to provide power for mission-critical loads. Substantial energy savings is the major reason why the GDC, which is on track for a Silver certification under the US Green Build- ing Council’s Leadership in Energy and Environmental Design (LEED) program, is a landmark project in the use of micro- turbines as a distributed generation power source. Microturbines are a major factor in a UPS-combined cooling, heat, and power (CCHP) system designed to achieve a 50% energy reduction compared with a data center using traditional power sources. The natural gas-fueled Capstone microturbines are at the heart of the data center’s electrical trigeneration system. Despite having patented the design years ago, this project is actually the first time that Capstone put the units into produc- tion form. Twelve units were installed in the facility and a maximum of 10 are used at any given time to power the servers and equipment. Kevin Noble, manager of en- gineering at Syracuse, points out that the units’low-emissions design eliminated the need for a permit, although the emission sources are inventoried.Additionally, it was possible to mount the microturbines on concrete pads outside of the facility, and they produce virtually no vibration. “We talked to Capstone and realized that they had an inverter and batter- ies in one version of the standard C65,” recalls Noble.“We said:‘We are building a data center and need a UPS. It looks like this is most of one. Can we combine the functionality of trigeneration with a UPS?’ For related articles: www.distributedenergy.com/turbine
  • 4. 44 • www.distributedenergy.com Capstone informed us that they already had the concept patented but had never developed it. In February 2009, they agreed to develop a product for this proj- ect, and delivered 12 units in September of that year. We just added batteries and avoided the cost of a discrete UPS.” A key element in the facility’s energy efficiency is a separate “High Efficiency Mode” of operation. In this mode, the microturbine is turned on and supplies power to the critical alternating current (AC) bus through an inverter called a Load Control Module (LCM). In contrast to a typical data center that converts AC power from the utility’s electrical grid to direct current (DC) and then back to AC to power the servers, these microturbines can generate any combination of AC and DC power without a loss of power that typically occurs during transmission and conversion. The Hybrid UPS design does not require that the microturbine produce exactly the amount of power required by the critical load because a grid load control module (GLCM) allows power to flow out to the non-critical part of the distribution system. Alternatively, the GLCM can pull power in from the utility as needed to match critical load requirements. The cooling component of the sys- tem is particularly efficient because it uses “a Double-Effect Absorption Chiller.” The microturbines produce very clean exhaust heat that is diverted to two 150- ton Thermax absorption chillers. More conventional absorption chillers would convert waste heat from the microtur- bines to hot water used to make chilled water. But this conventional process utilizes hot water that reaches a relatively low temperature of about 220°F. The Thermax chillers, in contrast, can directly utilize the microturbines’ clean combus- tion product, which is nearly two-and-a- half times hotter, and convert it to chilled water. The result is much higher overall efficiency of 85–90% than using utility power and a traditional cooling system with overall efficiency of around 50%. The most consistent attribute of the Hybrid UPS system at the Syracuse GDC is flexibility. Depending on the facility’s fluctuating power needs, the number of microturbines producing dedicated pow- er to it varies from 5 to 10. The remaining microturbines produce extra power that is shipped to the university power grid or the building next door. The operation of the system is highly flexible. The Capstone turbine generator operates at very high speeds and produces a very high-frequency AC. One inverter, a generator control module (GCM) converts the high- frequency AC to DC using a 760-V DC Bus. Another converter, the LCM, then converts the 760 V of DC into a 50- or 60-Hz AC with a 400- to 480-V nominal three-phase voltage output for con- nection to the critical loads. The LCM maintains its frequency output in syn- chronism with the electric utility mode. A third converter, a load control module, connects to the utility and allows the facility to automatically either take power from, or inject power back to, the grid as conditions dictate. Due to this flexibility, the output of the turbine can be set to match the thermal load of the CCHP system for maximum efficiency. The GDC has the flexibility to produce 25 kW and get the other 25 kW from the local utility, for example. Noble points out that some precau- tions have been taken to ensure the reli- ability of this first use of Capstone’s Hy- brid UPS MicroTurbine.“We are deeply indebted to our chief information officer, Chris Sedore, for his encouragement of this project and his help in managing the risk associated with this level of innova- tion, which is quite radical in the data center world,” says Noble.“To deal with the potential for failure, and to facilitate maintenance, upgrades, and revisions to the systems, we have two strategies in place. The first is a completely redundant power system right down to every piece of IT equipment, as far as is practicable. Our racks all have white and black power cords for the a and b power systems, and we regularly test this system. We can completely drop one side, and no critical IT processes are significantly affected at all. The second builds on the fact that the load side inverters are synched to the grid. We have closed-transition transfer switches and can easily and seamlessly move either side from the microturbines to the grid at will.” From Aircraft to Power Generation Converting turbine engine technology that was originally designed for the avia- tion industry to non-aviation applica- tions is inherently innovative. Marine Turbine Technologies, LLC (MTT) has recently developed several new applica- tions for turbines. The 250-C20B/J model turbine, the cornerstone of the Rolls-Royce Model 250 engine line, recently has been improved with a new first-stage turbine nozzle material designed to extend the life of the component while maintaining engine performance. Gearbox lip-seals and shaft journals have also been redesigned to reduce oil consumption. MTT also recently entered the por- table generator market by targeting small distributed energy applications with two lightweight portable generator products. A Rolls-Royce Model 250 helicopter gas turbine engine has been selected to power a lightweight high-speed alternator that provides 250 kW in a small footprint package. MTT is working with an inter- national manufacturer that specializes in high-speed, lightweight alternators on the development of the product. Targeted first deliveries are forecasted for mid-2012. In addition, MTT has selected a Honeywell (Lycoming) T53-701/13B Helicopter Gas Turbine Engine to power a 1-MW por- table power generator package. The pro- gram is in the early stages of development and a natural gas fuel system is currently the top priority. The targeted first delivery is mid- to late 2012. In another application, the light- weight, portable 250-kW MTT Model 250 Series II can be transported by air, land or sea to bring reliable power supply to remote sites by incorporating its own fuel and oil supply and support systems. The generator is powered by Rolls Royce’s R-R Model 250 gas turbine engine.A modular aluminum enclosure allows the opera- tor to change out the turbine engine and generator package modules individually, a design intended to cause less downtime and maintenance expense. The gas turbine engine has been successfully demonstrated using diesel fuels, jet fuels, and biodiesel fuels, and liquid gas and natural gas will be explored as alternative fuels. DE Don Talend is a frequent contributor to Distributed Energy. Scan here to share this article or read later. Get the app at http://gettag.mobi