overview on hcfo-r1233zd(e) use for high temperature heat ... · • heat loss and pressure drop...
TRANSCRIPT
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Overview on HCFO-R1233ZD(E) use for high temperature heat pump application
Dr Nikhilkumar N ShahCentre for Sustainable Technologies
28/08/2019, Montreal
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Overview
• Introduction
• Details about • Experiment setup and Test Methods• Thermodynamic Analysis
• Results and Discussion• Thermodynamic simulation• Experiment results
• Conclusion
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Centre For Sustainable Technologies
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• Advanced Glazing
• Building Energy Systems
• Bio-energy
• Demand Side Management
• Energy Storage
• Energy Process Modelling
• Energy Market Modelling
• Energy Water Nexus
• Heat Pumps
• Passive Buildings
• Solar Energy
• Thermal Comfort
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Energy Research
Research income ~16M
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Mask wall holding
glazing sample
Control
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Compressor/
condenser
Control
gear
Mask wall holding
glazing sample
Control
chamberEnvironmental
chamber
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1m
2m
3m
4m
0m
1m
2m
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Compressor/
condenser
Control
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Large Sample Guarded Hot Box Solar Simulator Anaerobic Digester Development
Downdraft Gasification Heat Pump & Thermal Energy Storage Integration
Techno-economic and Energy Market Modelling
ASHP Test Chamber Battery Storage Integration Thermal Comfort Seasonal TES Test Houses
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Introduction
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High Temperature Heat Pump
• Huge waste heat recovery potential (e.g. 370 TWh in Europe)
• Refrigerant for HT application with low GWP and ODP and critical temperature (150°C)
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About R1233ZD(E)
• Good potential to replace R245fa , up to 150°C
• Literature highlights : Low thermal stability compared to R245fa
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Parameters R1233zd(E) R245fa
Chemical formula CF3CH=CHCF3 CF3CH3CF2
Pc (kPa) 3570 3650
Tc (°C) 165.6 154.01
Boiling point (°C) 17.97 14.81
Slope Dry Dry
ODP 0.00034 0
GWP100yr 7 1030
Atmosphere lifetime (yr) 0.07 7.7
Flammability Non-flammable Non-flammable
ASHRAE std 34 safety class A1 B1
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Literatures on R1233ZD(E)
• 75 publications
• Very limited investigation on HTHP using R1233zd(E)
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Literatures on R1233ZD(E)
• Most studies focused on properties, heat transfer and/or ORC simulations, only three studies related to HP
• R1233zd(E) blends with HCs help to overcome flexibility issues and 2 to 10% higher COP compared to R134a/R22
• Higher COP with blend of R1233zd(E) and R1234yf compared to R1233zd(E) alone
• Industrial HPs (28 kW to 20 MW) in market but none using R1233zd(E)
• Trade-off between VHC and COP, potential of reduced compressor size
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Literatures on R1233ZD(E)
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Are of investigation Type of investigation
Main subject Sub-subject Exp. Theo/mod/sim
Flow regime pressure drop 4 2Heat transfer flow boiling, film condensation, nucleate boiling, condensation, supercritical
pressure, high temperature12
Ejector vapour-liquid, critical/sub-critical model, refrigeration system working fluid 3
ORC scroll expander, various application, cycles configuration, with solar, with ejector, evaluation system, fluid comparison
5 26
Material compatibility between refrigerant and polymer 1Properties liquid viscosity, surface tension, solubility, diffusion, thermal conductivity, PvT,
film thickness, heat capacity, speed of sound, liquid density 13
Heat pump booster, water heater (ref mixture), centrifugal chiller 3
Combined system
ORC+HP, absorption compression, trigeneration, 3
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Experiment setup, Test Methods and Thermodynamic Analysis
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Test Set-up
• To understand behavior of oil and system components at high temperature
• Initial operation and tuning using R245fa as a reference
• Designed Tcond=125°C and Tevp= 50°C with SH=20K (evaporator + liquid-suction heat exchanger) and SC=9K
• Test operation between 85°C to 135°C
• Thermodynamic simulation and comparative analysis for R245fa and R1233zd(E)
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Components Details
Compressor Open typeDis: 28 m3/h @50 Hz (1450 rpm)
Drive EMI motor with Danfoss FC103drive
Condenser SWEP BPHE BT25Thx50
Evaporator SWEP BPHE N80Hx26
Expansionvalve
Danfoss EEV ETS12.5 withEKC316A
Oil separator ESK OS22
Receiver Bitzer FS102
Heat transferfluid
Water and Therminol66
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HTHP test rig
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Test methods and simulation
• Test points:
• Tcond = 85 to 135°C at interval of 10K with fixed Tevp=50°C
• Fixed flow rates on secondary side and operation at 50 Hz
• Simulation assumption:
• Heat loss and pressure drop negligible
• LSH provides constant superheat of 15K after evaporator
• Compressor map from manufacture to evaluate VE and IE at different conditions.
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Parameters Values / Details
Refrigerant R1233zd (E) and R245fa
Condensing temperature(C)
85,95,105,115,125,135
Evaporation temperature(C)
45,55,65,75
Superheat @evp andsubcooling @cond (K)
5 and 5
Superheat using LSH (K) 15
Isentropic efficiency (%) Based on compressor map:temperature lift
Volumetric efficiency (%) Based on compressor map:temperature lift
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Results and Discussion
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Thermodynamic Simulation
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Thermodynamic Simulation
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Thermodynamic Simulation
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Experiment Results
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Focus on Oil behaviour and experience with commercial components
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Oil viscosity
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Experiment Results
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Modification to accommodate oil cooling
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Experiment Results
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• Initial performance
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Conclusion
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Experience and future work
• Huge potential for HTHP but need more investigation on experiment side with new refrigerants such as R1233zd(E), Water or blends etc
• Simulation results showed up to 8% higher COP compared to R245fa
• If used as a drop-in : consideration should be in HEX sizing
• Special EEV for new refrigerant (e.g. body/cooling or programme)
• Use of POE and further investigation required
• Long term performance and stability study requires with compatible oil, refrigerant and material
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Work in Progress
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Work in Progress
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Pure oil Oil + Refrigerant
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Acknowledgement
• Engineering and Physical Sciences Research Council (EPSRC) through the Interdisciplinary Centre for Storage, Transformation and Upgrading of Thermal Energy (i-STUTE) (Grant No. EP/K011847/1)
• European Unions’ Horizon 2020 research and innovation programme through the Compressed Heat Energy Storage for Energy from Renewable Sources (CHESTER) project (Grant No. 764042).
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Thank You