In the present work, a versatile, modular, scalable design for miniaturized heat pumps was developed, The researchers have also adapted the technology to provide cooling using waste heat from diesel-driven generators at military bases.

1. Emerging Technologies
MONOLITHIC MICRO SCALE HEAT PUMP
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Presentation By: Professor :
Suraj D Naik Veena Mam
NMIT NMIT

2. Introduction
 All over the world,increasing energy consumption,liberisation of energy markets and the need
to take action on climate change are producing new challenges for energy.
 The various technologies are accessed with
respect to status,trends and perspectives for
the technology and international R&D plans.
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3. Heat Pumps
Heat Pump: A heat pump is a versatile, efficient cooling and heating system.
 Heat pump can change the flow of refrigerant and either heat or cool a
home.
 Air is blown over an evaporator coil, transferring heat energy from
the air to the refrigerant.
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4. Operating principle Of Heat Pump
 A low temperature waste heat flow can be upgraded to useful high temperature heat with
the use of a heat pump. Among the different types of heat pumps that have been
developed.
 Its operating principle is based on compression and expansion of a working fluid, or so
called 'refrigerant’.
 A heat pump has four main components: evaporator, compressor, condenser and
expansion device.
 The refrigerant is the working fluid that passes through all these components. In the
evaporator heat is extracted from a waste heat source. In the condenser this heat is
delivered to the consumer at a higher temperature level. Electric energy is required to
drive the compressor and this energy is added to the heat that is available in the
condenser. The efficiency of the heat pump is denoted by its COP (coefficient of
performance), defined as the ratio of total heat delivered by the heat pump to the amount
of electricity needed to drive the heat pump.
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5. Monolithic Heat Pump:
Thermally activated heat pump that is employed to
generate cooling from waste heat streams, such as
engine exhaust or directly from combustion of
liquid fuels.
 Developed by researches led by Srinivas
Garimella.
 Size: Novel textbook size
 Operation: Cooling System that operates on
waste heat rather than electricity.
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6. Working
 Extremely small passages are etched into thin sheets of metal with different areas
representing different components.
 Working fluids flow in the same order as they would in a larger system, albeit in
one space.
 The minimization of plumbing inlets and outlets translates into greater
compactness and lower price tags.
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7. Observation
 A 300 W nominal cooling capacity ammonia-water absorption heat pump.
 Dimension: 200 × 200 × 34 mm.
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 Mass: 7 kg was fabricated and successfully tested over a range of heat sink.
 Temperature: Successfully tested over a range of heat sink of 20 to 35°C.
 Desorber thermal input range: 500 to 800 W.
 Measured evaporator coolant heat duties: 136 to 300 W.
 System COPs : 0.247 to 0.434.
 Nominal rating condition of 35°C heat sink temperature, the maximum
 Maximum thermal input of 800 W produced a cooling effect of 230 W,
representing a COP of 0.29.

9.  In the present work, a versatile, modular, scalable design for miniaturized heat pumps
was developed
 The researchers have also adapted the technology to provide cooling using waste heat
from diesel-driven generators at military bases.
 According to Garimella,
 Not only is diesel fuel very expensive to transport, there are also risks to humans in
delivering the fuel,”
 Using the energy in the diesel fuel to the fullest extent by providing power as well as
cooling through these units, without consuming additional primeenergy, will lower overall
costs and increase personnel safety.”
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Conclusion

10. Advantages
 No synthetic refrigerants are used, and less fluid is required, which further lowers
costs and increases safety.
 No compressor is needed and there are few moving parts, decreasing noise and
increasing reliability.
 Modular design allows units to be configured to generate anywhere from a few
watts to tens of kilowatts of cooling or heating.
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11. References
 A Microscale Monolithic Absorption Heat Pump Matthew D. Determan,
Srinivas Garimella* Sustainable Thermal Systems Laboratory George W.
Woodruff School of Mechanical Engineering Georgia Institute of Technology
Atlanta, GA (404) 894-7479; srinivas.garimella@me.gatech.edu
 Ernst, T. C. and Garimella, S. (2008), "Demonstration of a Wearable Cooling
System for Elevated Ambient Temperature Duty Personnel," Proc. 19th
National & 8th ISHMT-ASME Heat and Mass Transfer Conference, January
3 - 5, 2008, Hyderabad, India, , SPH-6.
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