IMPROVING THE EFFICIENCY OF WASTE HEAT RECOVERY SYSTEMS BY MEANS OF A COMBINED TURBINE-PELTIER SYSTEM

Öz

A novel Combined Turbine-Peltier System (CTPS) was designed and built to harness both thermal and kinetic energies of the exhaust gas of an engine and convert it to electrical power. The Turbine-Generator was connected to the turbocharger shaft and the Thermoelectric Generators (TEG) were assembled between the heat exchangers mounted on the exhaust pipe. The Computational Fluid Dynamics (CFD) approach and Taguchi optimization technique were employed in order to analyze and optimize the flow field and heat transfer characteristics of the system. Based on the optimized numerical results, an experimental setup was designed and manufactured, and the experiments were conducted on an engine operating at different load and speed conditions. The harvested maximum power output for a single TEG was 5.5 W with the thermal efficiency of 3.6% and the net output power of the CTPS was 190 W obtained at the engine speed of 3000 rpm. The maximum increase in the power of the ICE combined with CTPS method was calculated as 1.6%. The obtained numerical results were compared with the experiments and showed a good accordance with the maximum deviation of 6%.

Anahtar Kelimeler

• Waste Heat Recovery
• Thermoelectric Generator
• Heat Exchanger
• Turbine Generator
• Internal Combustion Engine

ATIK ISI GERİ KAZANIM SİSTEMLERİNİN KOMBİNE TÜRBİN-PELTİER SİSTEMİ İLE VERİMLİLİĞİNİN ARTIRILMASI

Öz

Yeni bir kombine Türbin-Peltier sistemi tasarlanıp ve üretilerek bir motorun egzoz gazının hem termal hem de kinetik enerjilerini kullanarak elektrik gücüne dönüştürmesi hedeflenmiştir. Türbin-Jeneratör, turboşarj miline bağlandı ve egzoz borusuna monte edilen ısı eşanjörleri arasına Termoelektrik Jeneratörler (TEG) monte edilmiştir. Sistemin akış alanı ve ısı transferi özelliklerini analiz etmek ve optimize etmek için Hesaplamalı Akışkanlar Dinamiği (HAD) yaklaşımı ve Taguchi optimizasyon tekniği kullanılmıştır. Optimize edilen sayısal sonuçlara dayanarak bir deney düzeneği tasarlanıp üretilmiş ve deneyler farklı yük ve hız koşullarında çalışan bir motor üzerinde gerçekleştirilmiştir. Tek bir TEG için elde edilen maksimum çıkış güçü %3,6 termal verimlilikle 5,5 W ve kombine Türbin-Peltier sisteminin net çıkış gücü 3000 rpm motor devrinde 190 W olarak elde edilmiştir. kombine Türbin-Peltier sistemi yöntemiyle birleştirilen içten yanmalı motorun gücündeki maksimum artış %1,6 olarak hesaplanmıştır. Elde edilen sayısal sonuçlar deneylerle karşılaştırılmış ve maksimum %6'lık sapma ile iyi bir uyum göstermiştir.

Anahtar Kelimeler

• Atık Isı Geri Dönüşüm
• Termoelektrik Jeneratör
• Eşanjör
• Türbin Jeneratör
• İçten Yanmalı Motor

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