On the effects of increased coolant temperatures of light duty engines on waste heat recovery
Singh, Vikram LU ; Rijpkema, Jelmer Johannes ; Munch, Karin ; Andersson, Sven B. and Verhelst, Sebastian LU
(2020)
In Applied Thermal Engineering
172.
- Abstract
In this paper, an investigation is done into the potential of increasing the coolant temperature of an engine to maximize the powertrain efficiency. The study takes a holistic approach by trying to optimise the combined engine and waste heat recovery system. The work was done experimentally on a Volvo 4-cylinder light duty diesel engine in combination with Rankine cycle simulations. For the study, the coolant temperature was swept from 80 °C to 160 °C at different operating points. It was seen that with increased coolant temperatures, the brake efficiency of the engine increased by up to 1 percentage point due to reduced heat losses. An optimum coolant temperature was observed, dependent on the operating point, for maximizing coolant... (More)
In this paper, an investigation is done into the potential of increasing the coolant temperature of an engine to maximize the powertrain efficiency. The study takes a holistic approach by trying to optimise the combined engine and waste heat recovery system. The work was done experimentally on a Volvo 4-cylinder light duty diesel engine in combination with Rankine cycle simulations. For the study, the coolant temperature was swept from 80 °C to 160 °C at different operating points. It was seen that with increased coolant temperatures, the brake efficiency of the engine increased by up to 1 percentage point due to reduced heat losses. An optimum coolant temperature was observed, dependent on the operating point, for maximizing coolant recoverable power. An expansive study was done simulating 48 working fluids for a dual loop waste heat recovery system. From the working fluids simulated, cyclopentane was seen as the best for coolant waste heat recovery, whereas methanol and acetone were better for the exhaust gases. The gain in efficiency seen, was up to 5.2 percentage points, with up to 1.7 percentage points as the effect due to recovered power from the coolant.
(Less)
- author
- Singh, Vikram
LU
; Rijpkema, Jelmer Johannes
; Munch, Karin
; Andersson, Sven B.
and Verhelst, Sebastian
LU
- organization
- publishing date
- 2020-05-25
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Elevated coolant temperatures, Light duty engine, Low temperature waste heat recovery, Rankine cycle, Recoverable power, Reduced heat losses
- in
- Applied Thermal Engineering
- volume
- 172
- article number
- 115157
- publisher
- Elsevier
- external identifiers
-
- scopus:85081211521
- ISSN
- 1359-4311
- DOI
- 10.1016/j.applthermaleng.2020.115157
- language
- English
- LU publication?
- yes
- id
- 356c09d6-a2c3-45ba-ac71-407e28decde1
- date added to LUP
- 2020-03-29 17:57:10
- date last changed
- 2022-04-18 21:24:17
@article{356c09d6-a2c3-45ba-ac71-407e28decde1,
abstract = {{<p>In this paper, an investigation is done into the potential of increasing the coolant temperature of an engine to maximize the powertrain efficiency. The study takes a holistic approach by trying to optimise the combined engine and waste heat recovery system. The work was done experimentally on a Volvo 4-cylinder light duty diesel engine in combination with Rankine cycle simulations. For the study, the coolant temperature was swept from 80 °C to 160 °C at different operating points. It was seen that with increased coolant temperatures, the brake efficiency of the engine increased by up to 1 percentage point due to reduced heat losses. An optimum coolant temperature was observed, dependent on the operating point, for maximizing coolant recoverable power. An expansive study was done simulating 48 working fluids for a dual loop waste heat recovery system. From the working fluids simulated, cyclopentane was seen as the best for coolant waste heat recovery, whereas methanol and acetone were better for the exhaust gases. The gain in efficiency seen, was up to 5.2 percentage points, with up to 1.7 percentage points as the effect due to recovered power from the coolant.</p>}},
author = {{Singh, Vikram and Rijpkema, Jelmer Johannes and Munch, Karin and Andersson, Sven B. and Verhelst, Sebastian}},
issn = {{1359-4311}},
keywords = {{Elevated coolant temperatures; Light duty engine; Low temperature waste heat recovery; Rankine cycle; Recoverable power; Reduced heat losses}},
language = {{eng}},
month = {{05}},
publisher = {{Elsevier}},
series = {{Applied Thermal Engineering}},
title = {{On the effects of increased coolant temperatures of light duty engines on waste heat recovery}},
url = {{http://dx.doi.org/10.1016/j.applthermaleng.2020.115157}},
doi = {{10.1016/j.applthermaleng.2020.115157}},
volume = {{172}},
year = {{2020}},
}