Thermal Systems for Vehicle Thermal Management, Air Conditioning, Heat Recovery and Future Fuels
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- Lioba Becker
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1 Fakultät Maschinenwesen, Institut für Energietechnik, Bitzer Stiftungsprofessur für Kälte-, Kryo- und Kompressorentechnik Thermal Systems for Vehicle Thermal Management, Air Conditioning, Heat Recovery and Future Fuels Ingolstadt, Prof. Dr.-Ing. U. Hesse Bitzer-Stiftungsprofessur für Kälte-, Kryo- und Kompressorentechnik
2 Vehicle Thermal Management Engine Cooling only / Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 2
3 Vehicle Thermal Management Electric Powertrain and Passenger Comfort /ATZ-Online/ Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 3
4 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 4
5 Road Map Vehicle Thermal Management r future fuel r electric powertrain r waste heat recovery r A/C with new refrigerants r engine thermal management r air conditioning (A/C) r engine cooling and heating r engine cooling only Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 5
6 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 6
7 Temperature Level Ambient Temperature Levels Combustion Engine Heat Source Heat Sink Engine exhaust gas Engine - coolant Heater A/C Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 7
8 Temperature Level Ambient Temperature Levels Electric Vehicle Heat Source Heat Sink Range Extender Thermal Storage (HT) E - Motor AC Inverter, DC-DC Heater Battery A/C Thermal Storage (LT) Battery Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 8
9 Temperature Level Ambient Temperature Levels Fuel Cell Electric Vehicle with LH 2 Tank Heat Source Heat Sink Fuel Cell Thermal Storage (HT) E - Motor AC Inverter, DC-DC Heater Battery A/C Thermal Storage (LT) Battery LH 2 Tank Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 9
10 Content Road map and definitions Thermal management Temepature levels Engine thermal management MAC mobil air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 10
11 Combustion Engine Vehicle Thermal Management Automotive cooling systems designed for the highest necessary heat rejection this operating state is reached only during 3-5% of operation in most cases the thermal situation is subcritical the engine is overcooled A demand-responsive engine cooling system provides: 3 to 5 % reduced fuel consumption increased passenger comfort.. faster heat-up environmental compatibility.. reduced tail pipe emissions specific components specific control strategies demand-responsive cooling system Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 11
12 Components of a Thermal Management System - Overview / SAE Technical Paper / Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 12
13 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 13
14 Automotive Air Conditioning Air conditioning only Refrigerant: R134a HVAC Evaporator Frontend Condenser Belt driven compressor - variable capacity - fixed capacity /Source: IPETRONIK/ /Source: Behr/ Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 14
15 Automotive Air Conditioning condenser receiver expansion valve evaporator compressor R134a system internal heat exchanger (optional) Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 15
16 Automotive Air Conditioning Passenger comfort Performance.. cool down Environment.. ozone depletion Environment.. global warming Enhanced efficiency.. fuel consumption => credits Extended functionality.. heat pumping, el. powertrain cooling (battery, inverter, DC/DC) Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 16
17 Automotive Air Conditioning Refrigerants: Transition CFC-12 to HFC-134a Omission of ozone depletion Significant reduction of global warming effect F-gases: effect of globaly produced F-gases as Gt CO 2 equivalent (grey: CFC and HCFC, red: HFC) Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 17
18 Automotive Air Conditioning 0,23 % refrigerants stat. 0,11 % refrigerants MAC 0,11 % of total global greenhouse emissions are due to the HFC refrigerants used in mobile air conditioning (MAC) Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 18
19 Automotive Air Conditioning DIRECTIVE 2006/40/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 17 May January 2011: no type-approval for vehicle fitted with an A/C system designed to contain fluorinated greenhouse gases with a GWP > January 2017: new vehicles fitted with an air-conditioning system designed to contain fluorinated greenhouse gases with a GWP > 150: (a) certificates of conformity no longer considered (b) registration refused and sale & entry into service prohibited GWP (global warming potential): R134a: 1430, R1234yf: 4, CO 2 : 1 /IPCC/ Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 19
20 Automotive Air Conditioning Refrigerants: HFO 1234yf Properties and behavior close to R134a GWP: 4 /IPCC/ resp. <1 /Reviews of Geophysics; Volume 51, June 2013/ Serial vehicles already in the market Mildly flammable Ignition in presence of C Decomposition products include hydrogen fluoride (HF, LC50 = 966 ppm) and carbonyl fluoride (COF 2, LC50 = 360 ppm) /Graz, 2008/ R1234yf: ignition of refrigerant in a test car after a simulated accident with a refrigerant leakage (some do some do not ignite) Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 20
21 Automotive Air Conditioning Refrigerants: Natural refrigerants - hydro carbons, e.g. propane (R290) GWP = 3 - CO 2 (R744) GWP = 1 Propane: Similar pressure levels and components Efficient refrigerant Used already in not OEM approved retrofit Highly flammable => Secondary fluid needed => Reduced efficiency Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 21
22 Automotive Air Conditioning Refrigerants: CO 2 (R744): Transcritical cycle Pressure level 120 to 160 bar (25 to 32 bar with R134a) All new components and control Also interesting for heat pump function Higher efficiency than R134a at lower ambient temperature Lower efficiency than R134a at high ambient temperature Development of application for MAC had been terminated in 2005 Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 22
23 Cycle and Process with CO 2 (R744) gac cooler p krit = 7,38 MPa expansion valve compressor evaporator internal heat exchanger CO 2 system accumulator transcritical process Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 23
24 lg (Pressure) Process with CO 2 (R744) Cooling 120 bar 35 bar Specific enthalpy Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 24 w a
25 lg (Pressure) Process with CO 2 (R744) Heating 120 bar 35 bar 20 bar Specific enthalpy Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 25 w/o a
26 Cool Down Performance R744 / R134a Ambient temp.: 43 C, RH: 40 %, Sunload: 1000 W /F. Wiescholek, Visteon, Small Cars with R744, VDA Wintermeeting, Saalfelden, 2007/ Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 26
27 Efficiency R744 / R134a (SAE ARCRP 1) /Pedrag Hrnjak, VDA-Wintermeeting 2007/ Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 27
28 CO 2 Time Schedule An approach: Restart of development Building base of serial suppliers Enhance efficiency and NVH (competitive to current R134a) Development Serial project development Process and industrialization Of tool samples Full validation SOP DIRECTIVE 2006/40/EC: phase out of R134a in all new cars by 1 January Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 28
29 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 29
30 CO 2 Air / Air Heat Pump Cycle 4-Way-Valve Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 30
31 CO 2 Air / Air Heat Pump Cycle 4-Way-Valve flash fogging Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 31
32 Flash Fogging IF : + heating with former evaporator + low ambient temperature + low wind shield temperature + high humidity Limited Vision Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 32
33 Advanced Heat Pump Cycle engine /SAE Phoenix 2004/ Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 33
34 Heating mode Wind tunnel test: -20 C heating mode: after 5 min engine Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 34
35 Fuel Consumption Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 35
36 Electric Powertrain Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 36
37 Heat Pump for electric Vehicle + battery - P el. Q H Assumption: Heating demand: 3 kw Distance: km/h Energy Heating 9 kwh 45 % of a 20 kwh battery battery capacity traction heating Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 37
38 Heat Pump for electric Vehicle + - P el. Q 0. Q H Assumption: Heating demand: 3 kw Distance: km/h Energy Heating 9 kwh Heat a COP of 3 15 % of a 20 kwh battery battery capacity traction heat pump saving Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 38
39 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuels Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 39
40 Waste Heat Recovery Waste heat of a combustion engine Development of components and system e.g.: turbo, piston or scroll expander Conept: Rankin Cycle with natural working fluid Savings: up to 5% fuel consumption (long distance truck) Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 40
41 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 41
42 Hydrogen Storage Compressed Gas Cryocompressed Liquid Solid storage Physisorption Metal hydrides Complex hydrides Chemical hydrides Source: Dynetek Source: BMW Source: BMW 1 kg - 6 kg one or more pressure vessels 4 kg - 12 kg insulated cryogenic pressure vessel 7 kg - 12 kg insulated cryovessel Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 42
43 Content Road map and definitions Thermal management Temperature levels Engine thermal management MAC mobile air conditioning Working fluids Functionalities Waste heat recovery Future fuel Conclusion Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 43
44 Summary Management of different heat sources and heat sinks at different temperature levels From 22 K (LH 2 ) Around ambient temperature Up to 800 K (exhaust gas) for powertrain component thermal management and climate control Conventional and electric powertrain Sustainable A/C and heat pump refrigerants Benefit Efficiency Function and durability Passenger comfort and safety Sept. 26th, 2013 ICSAT Ingolstadt Hesse ThM 44
45 Prof. Dr.-Ing. Ullrich Hesse Technische Universität Dresden Institut für Energietechnik Bitzer Stiftungsprofessur für Kälte-, Kryound Kompressorentechnik Dresden Tel.:
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