Waste Heat Recovery

Waste Heat Recovery Waste Heat Recovery from from

Combustion EnginesCombustion Engines

Gunnar LatzPhD Student

Chalmers University of Technology

Energirelaterad fordonsforskningGöteborg

09.10.2014

Waste Heat Recovery

Project facts

Program: Fordonsstrategisk Forskning och Innovation (FFI)

Project start/end: 01/2014 – 06/2015 (2. Phase)

Project leader: Ingemar Denbratt, Chalmers

Budget: 1.195 kSEK per university (2014)

Waste Heat Recovery

Project organisation

The project is performed and coordinated by the three Swedish competence centers in combustion technology

CCGEx (KTH)Competence Center for Gas Exchange

CERC (Chalmers)Combustion Engine Research Center

KCFP (Lund University)Kompetenscentrum Förbränningsprocesser

Volvo Car Corporation

Waste Heat Recovery

Motivation – Energy balance

Fuel Energy (100

%) Mechanical Energy ~42 %

Charge air cooler (200°C)

Exhaust gas

(250°C)

EGR (450°C)

~11 %~15 %

~11 %

Coolant and

radiation

~21 %

46 %

Heat recovery

Source: GT-Power model for Volvo MD13 engine

Waste Heat Recovery

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

Waste Heat Recovery

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

CCGEx

Project: Turbocompound

Waste Heat Recovery

Potential to decrease fuel consumption up to 4 %

Fu

el c

on

sum

pti

on

im

pro

vem

ent

[%]

Turbocompound+ Divided Exhaust Period (DEP)

+ Externally Divided Exhaust Period (ExDEP)

Waste Heat Recovery

PhD Student: Gunnar LatzSenior researcher: Sven Andersson, Karin Munch

CERC

Project: Rankine Cycle

Waste Heat Recovery

Evaporator

Condenser

Expansion device

Fluidpump

Rankine Cycle

Simulation models Experiments

Work output

Waste heat (e.g. exhaust gas)Design

data

Validation data

Potential to decrease fuel consumption by 4 – 6 %

Waste Heat Recovery

PhD Student: Prakash Narayanan (since October 2011, before: Mengqin Shen)Senior researcher: Martin Tunér, Per Tunestål

KCFP

Project: Humid Air Motor (HAM)

Waste Heat Recovery

Reduced in-cylinder temperatures Reduction of NOxBenefits of the HAM concept over conventional EGR engine:

1. Lower heat losses2. “Free” vapor expansion over the turbine3. Reduction of in-cylinder pumping losses

Potential to decrease fuel consumption upto ~8% (best operating point)

Engine

Humidifier

Waste Heat Recovery

Thank you for your attention!