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Green economy with
natural refrigerants
by
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Natural Refrigeration Award 2013
Schaffhausen
Planning, construction and initial operation
of a refrigeration cycle
for demonstration purposes
with the refrigerant propane (R290)
by Jens Eiseler
University of Applied Sciences Karlsruhe, Germany
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1. Objective of the Bachelor Thesis
2. Approach of the refrigeration cycle design
3. Presentation of the refrigeration cycle (r/c)
4. Summary
Schaffhausen, 28 June 2013 Page 4
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2
Construction of a mobile r/c
• Easy understandable setup
1. Objective
Schaffhausen, 28 June 2013 Page 5
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2
Construction of a mobile r/c
• Easy understandable setup
• Visualization of the different
states
within the r/c
1. Objective
Schaffhausen, 28 June 2013 Page 6
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Construction of a mobile r/c
• Easy understandable setup
• Visualisation of the
different states
within the r/c
• Possibility to manually
influence
the operating behavior
2
1. Objective
Schaffhausen, 28 June 2013 Page 7
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Construction of a mobile r/c
• Easy understandable setup
• Visualization of the different
states
within the r/c
• Possibility to manually
influence
the operating behavior
• Use of an environmentally
friendly
refrigerant
2
1. Objective
Schaffhausen, 28 June 2013 Page 8
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ODP GWP Comments
R404A 0 3800 High GWP
R290 (Propane) 0 20 Flammable
R744 (CO2) 0 1 Very high pressure
Why Propane?
1. Objective
Schaffhausen, 28 June 2013 Page 9
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2
ODP GWP Comments
R404A 0 3800 High GWP
R290 (Propane) 0 20 Flammable
R744 (CO2) 0 1 Very high pressure
1. Objective
Schaffhausen, 28 June 2013 Page 10
Why Propane?
• environmentally friendly
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2
ODP GWP Comments
R404A 0 3800 High GWP
R290 (Propane) 0 20 Flammable
R744 (CO2) 0 1 Very high pressure
Why Propane?
• environmentally friendly
• demonstrate the safe use of a „dangerous“ refrigerant
1. Objective
Schaffhausen, 28 June 2013 Page 11
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• Calculation of the r/c with the
„Engineering Equation Solver“ (EES)
𝑡𝐻𝐷 = 45 °𝐶 𝑝𝐻𝐷 = 15,34 𝑏𝑎𝑟
𝑡𝑁𝐷 = −10 °𝐶 𝑝𝑁𝐷 = 3,45 𝑏𝑎𝑟
𝑄𝑉𝑒𝑟𝑑 = 1,471 𝑘𝑊 𝑉 = 0,74 𝑙
𝑚𝑖𝑛
𝑤𝑚𝑖𝑛 = 0,71 𝑚
𝑠
𝑤𝑚𝑎𝑥 = 15,31 𝑚
𝑠
2. Approach
Schaffhausen, 28 June 2013 Page 12
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• Calculation of the r/c with the
„Engineering Equation Solver“ (EES)
• Dimensioning of the components
Evaporator
Expansion valve
Internal HX
Pressure transducer
Volume flow meter
2. Approach
Schaffhausen, 28 June 2013 Page 13
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• Calculation of the r/c with the
„Engineering Equation Solver“ (EES)
• Dimensioning of the components
• Planning of the electronic system
Circuit breaker box
Housing for conductor plate for pressure transducers,
controlling the r/c and the dataloggers
2. Approach
Schaffhausen, 28 June 2013 Page 14
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• Calculation of the r/c with the
„Engineering Equation Solver“ (EES)
• Dimensioning of the components
• Planning of the electronic system
• Programming the operating software with Matlab
2. Approach
Schaffhausen, 28 June 2013 Page 15
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• Calculation of the r/c with the
„Engineering Equation Solver“ (EES)
• Dimensioning of the Components
• Planning of the electronic system
• Programming the operating software with Matlab
• Initial operation
charging the r/c with propane
leakage test
operating test
2. Approach
Schaffhausen, 28 June 2013 Page 16
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3. Presentation
Schaffhausen, 28 June 2013 Page 17
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pressure drop
in suction line
pressure drop in
condenser
pressure drop in evaporator
selecting between
the external
pressure
equalization
connect or disconnect the volume flow meter
connect or
disconnect
the internal HX
3. Presentation
Schaffhausen, 28 June 2013 Page 18
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Slide 6
3. Presentation
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Slide 6
3. Presentation
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Slide 7
3. Presentation
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• Simple setup for the r/c
• Built on a cart for mobility purposes
• Use of an environmental-friendly refrigerant
4. Summary
Schaffhausen, 28 June 2013 Page 22
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Thank you for your attention