1. Energirelaterad fordonsforskning
Waste Heat Recovery
from
Combustion Engines
Gunnar Latz
PhD Student
Chalmers University of Technology
Energirelaterad fordonsforskning
Göteborg

2. Project facts
Program: Fordonsstrategisk Forskning och Innovation (FFI)
Project start/end: 01/2014 – 06/2015 (2. Phase)
Project leader: Ingemar Denbratt, Chalmers
Budget: kSEK per university (2014)

3. Project organisation
The project is performed and coordinated by the three Swedish competence centers in combustion technology
CCGEx (KTH)
Competence Center for Gas Exchange
KCFP (Lund University)
Kompetenscentrum Förbränningsprocesser
CERC (Chalmers)
Combustion Engine Research Center
Volvo Car Corporation

4. Motivation – Energy balance
~21 %
Coolant and radiation
Fuel Energy
(100 %)
Mechanical Energy ~42 %
46 %
~11 %
~15 %
~11 %
Heat recovery
Charge air cooler (200°C)
Exhaust gas
(250°C)
EGR
(450°C)
Source: GT-Power model for Volvo MD13 engine

5. Project goals Evaluation of different heat-recovery technologies
Identifying gaps in knowledge for the respective technology
Creating simulation models and validate them by means of experiments or available experimental data
Providing scenarios for the applicability both in light duty and heavy duty vehicles

6. CCGEx Project: Turbocompound
PhD Student: Habib Aghaali (since March 2012, before: Gustav Ericsson)
Senior researcher: Hans-Erik Ångström

7. Fuel consumption improvement [%]
Turbocompound
+ Divided Exhaust Period (DEP)
+ Externally Divided Exhaust Period (ExDEP)
 Potential to decrease fuel consumption up to 4 %

8. CERC Project: Rankine Cycle PhD Student: Gunnar Latz
Senior researcher: Sven Andersson, Karin Munch

9. Waste heat (e.g. exhaust gas)
Simulation models
Experiments
Design data
Waste heat (e.g. exhaust gas)
Evaporator
Condenser
Expansion device
Fluid
pump
Work output
Rankine
Cycle
Validation data
 Potential to decrease fuel consumption by 4 – 6 %

10. KCFP Project: Humid Air Motor (HAM)
PhD Student: Prakash Narayanan (since October 2011, before: Mengqin Shen)
Senior researcher: Martin Tunér, Per Tunestål

11. Engine
Humidifier
Reduced in-cylinder temperatures  Reduction of NOx
Benefits of the HAM concept over conventional EGR engine:
Lower heat losses
“Free” vapor expansion over the turbine
Reduction of in-cylinder pumping losses
 Potential to decrease fuel consumption upto ~8% (best operating point)

12. Thank you for your attention!