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Effects of an Exhaust Heat Recovery System on Performance Characteristics of a Forklift Truck

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Abstract

Construction equipment has consumed a lot of energy with a high workload compared to commercial vehicles of the same class. So, fuel efficiency is one of the important indicators of merchantability of the construction equipment. Especially, because forklift has been generally used only when necessary, the work has been carried out without adequate warm-up. So, not only the thermal efficiency of the engine of the construction equipment has deteriorated but also the sufficient fluidity of auto transmission fluid and hydraulic fluid have been hardly able to secure. Therefore, the exhaust heat recovery (EHR) system which consists of exhaust heat recovery unit and auto-transmission fluid (ATF) heater has been developed to improve the fuel economy of forklift by recovering the waste heat of exhaust gas. The performance tests of a 4.5 ton forklift have been carried out to evaluate the effects of exhaust heat recovery system on the fuel economy under the VDI fuel consumption drive cycle. It has found that the fuel consumption of a 4.5 ton forklift can be reduced through the fast warm-up of the auto-transmission fluid by recovering the waste heat of exhaust gas.

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Abbreviations

AT:

auto transmission

ATF:

auto-transmission fluid

CFD:

computational Fluid Dynamics

dp :

pressure drop

EG:

exhaust gas

EHR:

exhaust heat recovery

Hc :

height of core

HF:

hydraulic fluid

H F :

height of fin

L O :

off-set length of fin

P F :

pitch of fin

Q :

heat transfer

T F :

thickness of fin

T H :

thickness of housing

T T :

thickness of tube

W C :

width of core

W T :

width of tube

δ S :

side gap

δ T :

tube gap

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Acknowledgement

The research was supported by a grant (No. 20172020108590) from the Korea Institute of Energy Technology Evaluation and Planning (KETEP), that is funded by the Ministry of Trade, Industry and Energy.

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Authors and Affiliations

  1. Eco-Energy Group, Korea Construction Equipment Technology Institute, 36 Sandan-ro, Gunsan-si, Jeonbuk, 54004, Korea

    Man-Woong Heo, Joo-Yeong Jeong & Han-Sung Yoo

  2. Coastal Development and Ocean Energy Research Center, Korea Institute of Ocean Science and Technology, 385 Haeyang-ro, Yeongdo-gu, Busan, 49111, Korea

    Man-Woong Heo

  3. Thermal Fluid Technology Research Team, Korea Automotive Technology Institute, 303 Pungse-ro, Pungse-myeon, Dongnam-gu, Cheonan-si, Chungnam, 31214, Korea

    Suk-Jung Bae & Hyung-Seok Heo

  4. Advanced Development Team, Haesong Engineering Co., LTD., 48 Judeongnonggong-gil, Judeok-eup, Chungju-si, Chungbuk, 27462, Korea

    Seung-Uk Park

Authors
  1. Man-Woong Heo
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  2. Suk-Jung Bae
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  3. Joo-Yeong Jeong
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  4. Han-Sung Yoo
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  5. Seung-Uk Park
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  6. Hyung-Seok Heo
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Correspondence to Hyung-Seok Heo.

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Heo, MW., Bae, SJ., Jeong, JY. et al. Effects of an Exhaust Heat Recovery System on Performance Characteristics of a Forklift Truck. Int.J Automot. Technol. 20, 579–588 (2019). https://doi.org/10.1007/s12239-019-0055-2

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  • DOI: https://doi.org/10.1007/s12239-019-0055-2

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