Best student award

12th IEA Heat Pump Conference 2017

ORC driven Heat Pumps running with gas supported turbomachinery : potential and optimization

Mounier VioletteLaboratory for Applied Mechanical Design

Ecole Polytechnique Fédérale de Lausanne

6/6/20171

Why focusing research on Heat Pumps?

6/6/2017 2

Electricity driven heat pumps

Advantages

Highly efficient

Mature market

Challenges

CO2 footprint

Rising electricity demand

Why focusing research on Heat Pumps?

6/6/2017 3

Thermally driven heat pumps

Advantages

Control of the energy source

Decreased elec. demand

Main technologies

Sorption

Gas fired heat pumps

…

ORC Driven Heat Pumps (HP ORC) : Exploring the potential

6/6/2017 4

Condenser C T

HP evaporator

ORC evaporatorNovelty 1

ORC driven

Novelty 2 :

Oil-free micro-turbocompressor

What is the full potential of this technology for domestic heating ?

Thermodynamics

Thermoeconomics

Heat Transfer

Turbomachineries

Rotordynamics

Design methodology

Cogeneration

Low temp sources

High efficiency

High power density

Simulation Experimental

Integrated Multi Objective Optimization

6/6/2017 5

Design point

Heat exchanger

TurbomachinesCost

Performance

FeasibilityBearings

HP-ORC

…

Integrated and optimized design of the turbocompressor

6/6/2017 6

Performance Feasibility

What are the most critical components to optimize ?

How to speed up the optimization process and keeping the accuracy ?

Can we increase the design robustness ?

Integrated and optimized design of the turbocompressor

6/6/2017 7

What are the most critical components to optimize ?

How to speed up the optimization process and keeping the accuracy ?

Can we increase the design robustness ?

+

Integrated and optimized design of the turbocompressor

6/6/2017 8

What are the most critical components to optimize ?

How to speed up the optimization process and keeping the accuracy ?

Can we increase the design robustness ?

Integrated and optimized design of the turbocompressor

6/6/2017 9

What are the most critical components to optimize ?

How to speed up the optimization process and keeping the accuracy ?

Can we increase the design robustness ?

Integrated and optimized thermodynamic design

6/6/2017 10

What are the optimum thermodynamic components design ?

What are the best configurations ?

Is this technology competitive with typical TDHPs ?

Performance Cost

Integrated and optimized thermodynamic design

6/6/2017 11

What are the optimum thermodynamic components design ?

What are the best configurations ?

Is this technology competitive with typical TDHPs ?

COP vs 𝛈𝐞𝐱𝐞 ?

Integrated and optimized thermodynamic design

6/6/2017 12

What are the optimum thermodynamic components design ?

What are the best configurations ?

Is this technology competitive with typical TDHPs ?

Thot = 120 ºC Thot = 180 ºC HP-ORC vs

Absorption

Integrated and optimized thermodynamic design

6/6/2017 13

What are the optimum thermodynamic components ?

What are the best configurations ?

Is this technology competitive with typical TDHPs ?

Performance Cost Feasibility

Full system optimization

Experimental validation

6/6/2017 14

Turbocompressor test bench

First proof of concept with air (Nrot > 150 krpm) Check rotordynamics models with air High-precision balancing knowledge (<1 micron)

Experimental validation

6/6/2017 15

Promising results

COP > 1.5

Qc = 40 kW

Nrot = 200 krpm

Thermal test bench

Proof of concept with R-134a Validation of turbomachineries 1D models Identification of technical challenges

Turbine 1D validation

Conclusion

6/6/2017 16

Experimental validation

Design methodology

ORC driven Heat Pump

+

Micro-turbocompressor

Market

investigation

Various

applications

Optimization

Cross-disciplinary

Conclusion

6/6/2017 17

Experimental validation

Design methodology

Insert your technology here

Market

investigation

Various

applications

Optimization

Cross-disciplinary

Thank you for your attention

Any questions ?