Grameen Phone operates a co-generation power system at their corporate headquarters (GP House) in Dhaka, Bangladesh to generate electricity and chilled water for air conditioning. The system uses two 1.4MW natural gas turbines that produce waste heat to power three 827RT absorption chillers. This co-generation system saves 2MW of power compared to separate power and cooling systems. Co-generation improves efficiency by capturing waste heat to produce useful outputs.

1. Welcome
To
Our Presentation
“Grameen Phone CHQ Powering and Co-Generation”
2/25/2014

2. Grameen Phone CHQ Building ( GP House)
• Total Power Demand: 2000KW
• Pick Time Chilling Load: 1600 RT
• Number of Staff : 3500
Location:
Grameenphone Ltd.
GPHOUSE
Basundhara, Baridhara
Dhaka-1229
Phone- +88-02-9882990
Fax- +88-02-9882970
Email : info@grameenphone.com
2/25/2014

3. Grameen Phone Corporate Head Quarter is the most high
Tech and luxurious office building in Bangladesh
2/25/2014

4. GP Power House
•
•
•
•
•
Natural Gas Turbine : 1.40 MW X 2 Sets ( Kawasaki, Japan)
Natural Gas Booster Compressor : 2 Sets
Diesel Generator : 1MW X 1Set
Air Compressor : 1 Set
Multi Energy Absorption Chiller : 827 RT X 3 Sets
Note: Co-generation system save almost 2.0 MW Power
requirements instead of load calculated 4.5 MW
2/25/2014

5. The co-generation system to produce 1600 RT chilling from waste
heat of 2.8Mw ( 1.4X2 nos.) Gas turbine
2/25/2014

6. Gas Turbine Co-Generation
Electricity
Exhaust Gas
Injection Steam for
Exhaust Gas
Gas-Turbine
Steam
Chilled
water
Absorption Chiller
Fuel
HRSG
Direct/Indirect Heating
Electricity.
Steam Turbine
Generator
Steam driven Facilities
Process steam
Thermal Fluid
Heater
2/25/2014
Exhaust Recovery
Chiller
Spray Dryer

7. •
Co-Generation
Cogeneration & CHP
• Cogeneration through combined heat and power (CHP) is the
simultaneous production of electricity with the recovery and utilization
heat. Cogeneration is a highly efficient form of energy conversion
and it can achieve primary energy savings of approximately 40% by
compared to the separate purchase of electricity from the national
electricity grid and a gas boiler for onsite heating. Combined heat and
power plants are typically embedded close to the end user and
therefore help reduce transportation and distribution losses,
improving the overall performance of the electricity transmission and
distribution network . For power users where security of supply is an
important factor for their selection of power production equipment
and gas is abundant, gas-based cogeneration systems are ideally suited
as captive power plants.
2/25/2014

8. Co-Generation
2/25/2014

9. Co-generation System Efficiency
•
Gas engine combined heat and power systems are measured based upon the efficiency of
conversion of the fuel gas to useful outputs. The diagram below illustrates this concept.
Firstly the energy in the fuel gas input is converted into mechanical energy via the
combustion of the gas in the engine’s cylinders and their resulting action in the turning of
the engine’s crankshaft. This mechanical energy is in turn used to turn the engine’s
alternator in order to produce electricity. There is a small amount of inherent loss in this
process and in this example the electrical efficiency of the engine is 40%
Heat Sources from a Gas Engine
•
•
•
•
•
•
The heat from the generator is available in from 5 key areas:
Engine jacket cooling water
Engine lubrication oil cooling
First stage air intake intercooler
Engine exhaust gases
Engine generator radiated heat, second stage intercooler
2/25/2014

10. COGENERATION SYSTEM COMPARISON ………..
CONVENTIONAL SYSTEM
Fuel
COGENERATION SYSTEM
ENGINE
Fuel
GTG
Electricity
Electricity
Exhaust
Gas
Fuel
Steam
BOILER
2/25/2014
Steam
HRSG

11. COGENERATION SYSTEM COMPARISON ………..
CONVENTIONAL
SYSTEM
ELECTRICITY
THERMAL
TOTAL
COGENERATION
SYSTEM
ELECTRICITY
THERMAL
TOTAL
2/25/2014
INPUT
(MW)
OUTPUT
(MW)
EFFICIENCY
(%)
6.00 MW
15.00 MW
6.00 MW
40.00 %
15.00 TON/HR
12.40 MW
10.54 MW
85.00 %
-
27.40 MW
16.54 MW
60.36 %
REQUIRE
-MENT
INPUT
(MW)
OUTPUT
(MW)
EFFICIENCY
(%)
6.00 MW
20.00 MW
6.00 MW
30.00%
15.00 TON/HR
-
10.54 MW
-
-
20.00 MW
16.54 MW
82.70 %
REQUIRE
-MENT

12. COGENERATION SYSTEM COMPARISON ………..
DIESEL
ENGINE
GAS
ENGINE
GAS
TURBINE
Thermal
Efficiency
< 60%
< 60%
Up to 90%
Starting
Capability
99.7%
<98%
99.99%
Reliability
>95%
<95%
>99%
Maintenance
Frequent
Frequent
Once Or Twice
In A Year
Emission
High
Medium
<30 ppm
(NOx -O2 : 15%)
2/25/2014

13. COGENERATION SYSTEM COMPARISON…………
DIESEL
ENGINE
GAS
ENGINE
Maintenance
Organization
10 - 20 people
10 - 20 people
Negligible
Electricity
Unstable and Hi
Distortion
Unstable and Hi
Distortion
Stable and Low
Distortion
Instantaneous
Load Application
Up to 40%
10% - 25%
100%
Vibration
High
High
Low
Lube Oil
Consumption
High
High
Low
2/25/2014
GAS
TURBINE
(for Smaller GT)

14. COGENERATION SYSTEM COMPARISON ……………..
DIESEL
ENGINE
GAS
ENGINE
GAS
TURBINE
Noise Level
High
High
Low (<85dBA)
Startup Time
<20 sec
Long
<40 sec
Layout
Big and Heavy
Big and Heavy
Compact &
Light
Low Load
Opera-ability
>50%
>50%
As low as 0%
Variety of Fuels
Liquid Fuel
Gaseous
Gaseous &
Liquid Fuel
2/25/2014
(in liquid fuel mode)

15. Tri-generation
•
Tri-generation or combined heat, power and cooling (CHPC), is the process by
which some of the heat produced by a co-generation plant is used to generate
chilled water for air conditioning or refrigeration. An absorption chiller is linked
to the combined heat and power (CHP) to provide this functionality. Quadgeneration takes this process one step further with the addition of systems to
purify carbon dioxide from the engine exhaust.
Benefits of tri-generation
•
•
•
•
•
•
•
•
There are a number of benefits to tri-generation including:
Onsite, high efficiency production of electricity and heat
Reduced fuel and energy costs
Lower electrical usage during peak summer demand
Engine heat can be used to produce steam of hot water for onsite use
Significant reductions in greenhouse gas emissions
No harmful chemical pollutants since water is used as the refrigerant
Beneficial for improving building’s energy efficiency ratings such as Green
Star and NABERS in Australia
•
2/25/2014

16. Tri-generation
Tri-generation systems supply energy in three forms:
•Electricity
•Heat
•Chilled water
Absorption chillers provide an economical and environmental alternative to conventional refrigeration. Combining
efficiency, low emission power generation equipment with absorption chillers allows for maximum total fuel efficiency,
elimination of harmful refrigerants and reduced overall air emissions. There are a number of different configurations of
CHP units where refrigeration can be derived
2/25/2014

17. Quad generation
Quad generation systems are some of the most advanced gas engine driven power
plants in the world. Quad generation encompasses the features of a tri generation
system, with combined electricity, heat and cooling but in addition includes the
recovery of carbon dioxide from the exhaust gas. This carbon dioxide is scrubbed
and can be used in industrial process or offers the potential for
carbon sequestration.
Benefits:
•
•
•
•
Potential for low or zero carbon emissions
Reduced operational costs versus separate purchase of electricity, heat, cooling
and carbon dioxide.
Uses all potential resources from gas utilization
Has a wide range of potential applications
Uses:
•
•
•
•
Carbon dioxide can be used for a number of purposes including:
As a growth enhancer in plants
Food industry
Industrial processes
2/25/2014

18. Expectation
We Should plan to do it in all our industrial,
commercial and residential complex to
save power and environment
2/25/2014

19. Getting it done, Do it yourself
THANKS TO ALL
2/25/2014