SLIDE 1
Summary
- Introduction
- Theoretical approach
- Working Fluids
- Experimental Work
- Results
- Future Work
HIGH TEMPERATURE HEAT PUMP MC Meeting 29 th of June Loughborough - - PowerPoint PPT Presentation
HIGH TEMPERATURE HEAT PUMP MC Meeting 29 th of June Loughborough - - PowerPoint PPT Presentation
HIGH TEMPERATURE HEAT PUMP MC Meeting 29 th of June Loughborough University Professor Neil J Hewitt Dr Mingjun Huang Miguel Ramirez Summary Introduction Theoretical approach Working Fluids Experimental Work Results
SLIDE 2
SLIDE 3
Introduction
High Temperature Heat Pump
Applications
- Petroleum Industry
- Chemical
- Food & Beverages
- District Heating
- Nuclear Power
- Desalination
- Waste Water Treatment
SLIDE 4
HT Heat Pump
Theoretical Approach
- Alternative working fluid
- Multistage cycles
- Compressor performance
- Controlling system
- Materials, Oil, etc
SLIDE 5
Working Fluids
Selection
GWP
- R410A = 2088
- R134a = 1300
- R245fa = 950
- R365mfc = 782
- R1234ze(E) = 6
- R1234ze(Z) = <10*
- R1234yf = 3
- R404A = banned
(F-Gas >2500 ban)
SLIDE 6
Experimental Work
- Single loop - Water to Water/ Brine to Water
- Steady State
- LT, MT, HT, VHT and non standard Temperatures
- British Standards 14511
Item Manufacturer Type Description No#
COMPRESSOR Copeland ZH15K4E Scroll 1 CONDENSER SWEP B8Tx40 2 LIQUID RECEIVER Denaline VLR 1.5 lt 3 FILTER/DRIER Danfoss DML 164 1/2" 4 EXPANSION VALVE Danfoss ETS6 Electronic 5 EVAPORATOR SWEP B15x20 6 SIGHT GLASS Danfoss SGP 7 SUPERHEAT CONTROLLER Danfoss EKD 316 8
Small Scale Unit Testing
SLIDE 7
Experimental Work
R134a R245fa Superheating 5°K 5°K Subcooling 3°K 3°K η isentropic 69% 62% Max Tevap 20°C 55°C Max Tcond 65°C 85°C
Testing Results
SLIDE 8
Experimental Work
Type of building Hospital Solar collectors 175 m2 STES Volume 800 m3 Demand temperatures 55/75°C Solar Fraction 50% Gas boiler (kW) 95 kW
75°C 65°C
STES District Heating - Poland
SLIDE 9
Experimental Work
R245fa Heat Pump
- Heating Capacity: 90kW
- Compressor: Stream semi-hermetic
- Compressor disp: 153 m3/h
- Single loop – Water to Water
- EXV: Electronic
- Tevap: 30° - 50°C
- Tcond: 70° - 80°C
- Pabs: 0.1 – 0.3 MPa
SLIDE 10
Results
Polish Pilot Plant
Tamb : 0° – 2.4°C Qheat : 39kW Pin : 7.1 kW COP : 5.5 ηisentropic 68% Tout max: 82°C
SLIDE 11
Future Work
Challenges
- Alternative Working fluids (150°-200°C)
- R245fa, R1234ze(Z), R365mfc
- Refrigerant Mixtures
- Compressor Technology
- Lubricants
- Sealing
- EXV Controllers
SLIDE 12