A dynamic model for thermoelectric generator applied to vehicle waste heat recovery

Song, Lan; Yang, Zhijia; Chen, Rui; Stobart, Richard

doi:10.1016/j.apenergy.2017.11.004

Cited by 159 publications

(40 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Table 1 lists very recent experimental studies of ATEGs. The most common design employed in ATEGs distributes commercial TEMs in a way where their hot side surfaces are in contact with longitudinal (with respect to the flow direction) plates that contour the perimeter of the device cross-section (rectangular [7,8,10,[12][13][14], square [11] or hexagonal [9]). The main problem of this layout is the high temperature that is achieved during a driving cycle, since hot gases at full load regimes may exceed 500 • C. Since the maximum allowable hot side temperature in bismute telluride TEMs is on the order of 250 • C, several authors have devised mechanisms to avoid damaging TEMs, which are mainly focused on bypassing the ATEG [8,10].…”

Section: Introductionmentioning

confidence: 99%

Power and Fuel Economy of a Radial Automotive Thermoelectric Generator: Experimental and Numerical Studies

et al. 2018

View full text Add to dashboard Cite

Recent developments of high performance thermoelectric (TE) materials have increased the interest of using this technology to directly convert waste heat into electricity. In the automotive sector, many automotive thermoelectric generators (ATEGs) designs use TE modules (TEMs) with high hot side temperatures to cope with high engine load regimes. Here, we develop a new concept of a radial ATEG that is specifically designed to work with low temperature TEMs, which enables the use of Pb-free modules and reduces the thermal stress of the device. A prototype is built and tested at different regimes in an engine test bench. A numerical model of the ATEG is developed and validated. The consequences of modifying (1) the exchange area between the heat absorber and the exhaust gases and (2) the effective figure of merit of TEMs on the electrical output power and fuel economy are investigated by means of simulations. Results indicate that the maximum fuel economy (1.3%) is not attained at the point of maximum output power (228 W). In terms of fuel economy, the back pressure at the exhaust penalizes high mass flow regimes. We use a dimensionless parameter to analyze the potential of the ATEG for reducing fuel consumption.

show abstract

Section: Introductionmentioning

confidence: 99%

Power and Fuel Economy of a Radial Automotive Thermoelectric Generator: Experimental and Numerical Studies

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Installing ATEGs in the exhaust gas recirculation (EGR) system (rather than in the exhaust pipe past the after-treatment system) is one alternative to recovering heat. Lan et al [15] analyzed this possibility in a large displacement engine. In heavy-duty vehicles, ATEGs can be installed in both exhaust and EGR systems [16,30], with a combined output power of 1 kW in a system fully integrated into the electronic controls of the vehicle.…”

Section: Thermoelectric Generatorsmentioning

confidence: 99%

“…We monitored the following information: engine torque, engine speed (rpm), exhaust mass flow rate, exhaust gas temperature at both ATEG inlet and outlet, water cooling volumetric flow rate, water cooling temperatures at both ATEG inlet and outlet, ambient temperature, ATEG output voltage, and output current (see Figure 2). The HSHE was connected to the circular cross-sectional area of the exhaust pipes (50 mm in diameter) by expansion and contraction elements (#4 in Figure 1a) very similar to those employed in other types of ATEGs whose designs are based on TEMs located on two parallel plates (e.g., References [6,13,15]). The overall dimensions of the ATEG were 440 × 200 × 20 mm (length × width × height) and a total weight of 7 kg.…”

Section: Experimental Set-upmentioning

confidence: 99%

Effects of Design Parameters on Fuel Economy and Output Power in an Automotive Thermoelectric Generator

Comamala

Cózar

Massaguer³

et al. 2018

Energies

View full text Add to dashboard Cite

The need for more sustainable mobility promoted research into the use of waste heat to reduce emissions and fuel consumption. As such, thermoelectric generation is a promising technique thanks to its robustness and simplicity. Automotive thermoelectric generators (ATEGs) are installed in the tailpipe and convert heat directly into electricity. Previous works on ATEGs mainly focused on extracting the maximum amount of electrical power. However, the back pressure caused by the ATEG heavily influences fuel consumption. Here, an ATEG numerical model was first validated with experimental data and then applied to investigate the effects that modifying the main ATEG design parameters had on both fuel economy and output power. The cooling flow rate and the geometrical dimensions of the heat exchanger on the hot side and the cold side of the ATEG were varied. The design that produced the maximum output power differed from that which maximized fuel economy. Back pressure was the most limiting factor in attaining fuel savings. Back pressure values lower than 5 mbar led to a < 0.2% increase in fuel consumption. In the ATEG design analyzed here, the generation of electrical output power reduced fuel consumption by a maximum of 0.5%.

show abstract

“…Bunun yanı sıra yapılan başka bir çalışma konusu da enerjinin geri kazanımı ve verimli kullanımı üzerinedir. Buna en iyi örneklerden biri atık ısı enerjisinin tekrar kazanımıdır [2][3][4].…”

Section: Introductionunclassified

“…Egzozdan dışarıya salınan bu ısı enerjisini tekrar kazanmak günümüz teknolojisi ile mümkündür. Son yıllarda atık ısı enerjisinin geri kazanımı üzerine yapılan otomobil egzoz atık ısısından elektrik enerjisi elde etme çalışmaları önem kazanmıştır [4]. B. Orr, A. Akbarzadeh, P. Lappas, araçların yakıt tüketimini ve emisyonunu azaltmak amacıyla ısıl tüpler ve TEJ kullanarak araç motorunun atık ısısından elektrik enerjisi elde etmişlerdir.…”

Section: Introductionunclassified

Egzoz Atık Isısından Termoelektrik Modülle Enerji Üreten Sistem Tasarımı ve Optimizasyonu

Karabektaş¹,

Bolatlı²

2018

acperpro

View full text Add to dashboard Cite

ÖZETGünümüzde enerji ihtiyacının artmasıyla birlikte bu ihtiyacın büyük bir bölümünü karşılayan fosil yakıtların tüketimi de artmaktadır. Yanması sonucunda karbon dioksit ( ) gibi zararlı gazlar açığa çıkaran fosil yakıtlar küresel ısınma sorunu gibi çevreye ciddi zararlar vermektedir. Fosil yakıt tüketimin çevreye verdiği zararları önlemek amacıyla son yıllarda sürdürülebilir enerji üzerine yapılan çalışmalar da artmıştır. Atık ısının geri kazanımı da bu çalışmalarda önemli bir yere sahiptir. Bu çalışmada; bir aracın egzozundan atmosfere verilen atık ısıdan termoelektrik jeneratörle (TEJ) elektrik enerjisi üreten sistem tasarımı yapılmıştır. Termoelektrik modüllerin (TEM) sıcak yüzeyine ısı transfer edebilmek için tasarlanan ısı eşanjörünün gövdesinde bulunan kanatçık yapıları değiştirilerek ısı transferinin en iyi olması için sistem optimize edilmiştir. Tasarımda 12, 14, 16 ve 18 kanatçıklı olmak üzere 4 çeşit yapı ANSYS Fluent modülünde analiz edilmiş ve eşanjörün TEM'le temas eden yüzeylerinde ısıl dağılım grafikleri değerlendirilmiştir. Bu sonuçlara göre; ortalama değerlerde ısıl dağılım gösteren yapı maksimum 226 ℃ yüzey sıcaklığı ile içten yanmalı motor performansını daha fazla kanatçıklı yapılara göre daha az etkilemesi ve kolay imal edilebilir olmasından dolayı 14 kanatçıklı yapıya sahip eşanjör tasarımı olduğu kanısına varılmıştır. Daha sonra tasarlanan 14 kanatçıklı eşanjör imal edilerek diğer ekipmanlarla birlikte TEM'den elektrik üreten düzenek hazırlanmıştır.Anahtar kelimeler: TEM, TEJ, atık ısı, sürdürülebilir enerji. ABSTRACTNowadays, with the increase in energy demand, the consumption of fossil fuels that meet a large part of this demand is also increasing. Fossil fuels which release harmful gases such as carbon dioxide as a result of combustion, cause serious damage to the environment, such as the problem of global warming. In recent years, studies about sustainable energy have also increased in order to prevent to environmental damages caused by fossil fuel consumption. Recovery of waste heat also has an important place in these studies. In this study; the design of a system that produces electrical energy with a thermoelectric generator (TEG) from waste heat is given to the atmosphere from an exhaust of a vehicle has been made. The system has been optimized to be the best of the heat transfer by changing the fin structures in the body of the heat exchanger designed to transfer heat to the hot surface of the thermoelectric modules (TEM). In design,four types of structures 12, 14, 16 and 18 finned have been analyzed in the ANSYS Fluent modüle and thermal distribution graphs on the surfaces which contacted with TEM of the exchanger have been evaluated. According to these results; it has been concluded that the structure which has a thermal distribution at the average values is 14 finned heat exchanger design due to the fact that it has max 226 ℃ and internal combustion engine is less affected then the more finned structures and it easily manufactured. After that, by manufacturing 14 finned heat e...

show abstract

A dynamic model for thermoelectric generator applied to vehicle waste heat recovery

Cited by 159 publications

References 19 publications

Power and Fuel Economy of a Radial Automotive Thermoelectric Generator: Experimental and Numerical Studies

Power and Fuel Economy of a Radial Automotive Thermoelectric Generator: Experimental and Numerical Studies

Effects of Design Parameters on Fuel Economy and Output Power in an Automotive Thermoelectric Generator

Egzoz Atık Isısından Termoelektrik Modülle Enerji Üreten Sistem Tasarımı ve Optimizasyonu

Contact Info

Product

Resources

About