Thermodynamic analysis of rhombic‐driven and crank‐driven beta‐type Stirling engines

Alfarawi, Suliman

doi:10.1002/er.5309

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…However, these engines only run under conditions of high‐temperature difference and high charge pressure. Alfarawi 15 investigated the differences in the performance of a GPU‐3 β ‐type Stirling engine driven by a rhombic or a crank mechanism. They found that at a lower hot‐end temperature of 300°C and lower charge pressure of 10 bar, both mechanisms cannot even drive the engine (producing negative work).…”

Section: Introductionmentioning

confidence: 99%

Development of a compact simple unpressurized Watt‐level low‐temperature‐differential Stirling engine

Huang

Chen

2020

Int J Energy Res

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Despite the fast advance of modern technology, poverty is still a serious problem in many developing countries; and more than 1 billion people are having no access to electricity. For these people, even a few Watts of electricity supply for lighting can make a big difference. In this study, a simple, compact, unpressurized, Watt-level low-temperature-differential Stirling engine has been developed aiming to solve the lighting problem in developing countries. The engine in this study is compact. Yet, it is capable of delivering useful electrical power. It is a γ-type Stirling engine with twin power pistons. The diameter of the displacer cylinder is 220 mm, comparable to the size of a cooking pot, and the weight of the engine is under 5 kg. Two energy-conservation/ heat-transfer enhancement measures have been incorporated into the engine's design: one is adopting a displacer/regenerator unit, and the other is machining engine-turn slotted grooves on its hot-and cold-end plates. CFD analysis showed that the combination of both measures could effectively improve the performance of the engine. Experiments were conducted to examine the engine's performance. In one experiment, the engine produced 3.7 W of electric power as temperature difference was 100 C, and its power was found to be almost linearly proportional to temperature difference. With a higher temperature difference of 140 C, the electric power reached 5.3 W. Another experiment that operated the engine for a prolonged period has proven the reliability of the engine's performance for long-time use. In practice, the engine can be operated by putting it on a stove table, and the residual heat from cooking is good enough to power the engine to produce usable electricity. Or it can be directly put on a wood fire to generate even higher electrical power.

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Section: Introductionmentioning

confidence: 99%

Development of a compact simple unpressurized Watt‐level low‐temperature‐differential Stirling engine

Huang

Chen

2020

Int J Energy Res

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“…In fact, the fluid friction associated with the flow through the heat exchangers and manifolds results in a pressure drop through these components. This consequently has an effect of reducing the power output of the engine, so-called pumping loss [14], [33]. Generally, the pressure drop through the heater, cooler and regenerator is calculated using empirical correlations for the friction coefficient.…”

Section: Pumping Lossmentioning

confidence: 99%

Energy and Exergy Analyses of Stirling Engine using CFD Approach

Ghafour

Mikhael

Ghandour

2020

ARFMTS

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A comprehensive characterization of the GPU-3 Stirling engine losses with the aid of the CFD approach is presented. Firstly, a detailed description of the losses-related phenomena along with the method of calculating each type of loss are addressed. Secondly, an energy analysis of the engine is carried out in order to specify the impact of each type of losses on the performance. Finally, the design effectivity of each component of the engine is investigated using an exergy analysis. The results reveal that the hysteresis loss occurs mainly within the working spaces due to the flow jetting during the first part of the expansion strokes. Additionally, the pressure difference between the working spaces is the main driver for the flow leakage through the appendix gap. The exposure of the displacer top wall to the jet of hot gas flowing into the expansion space during expansion stroke essentially increases the shuttle heat loss. A new definition for the regenerator effectiveness is presented to assess the quality of the heat storage and recovery processes. The energy analysis shows that regenerator thermal loss and pumping power represent the largest part of the engine losses by about 9.2% and 7.5% of the heat input, respectively. The exergy losses within regenerator and cold space are the highest values among the components, consequently, they need to be redesigned.

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“…Rejeneratör, enerji depolama görevi yapan gözenekli bir ısı eşanjörüdür. Stirling motorunda iş akışkanının çevrimde dolaşımı, krank miline bağlı pistonların sinüzoidal hareketiyle sağlanır [6]. Stirling motorları, iş akışkanının geçiş yolları, hareket iletim mekanizmaları, güç pistonu, yer değiştirme pistonu ve rejeneratörün düzeni ile yerlerinin çeşitliliğine göre farklı türlere sahiptir.…”

Section: Giriş (Introduction)unclassified

Krank kaydırmalı bir stirling motorunun termodinamik performansının nodal analiz ile incelenmesi

Özdemir,

Karabulut

2024

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Petrolün yaygın biçimde enerji kaynağı olarak kullanımı iklim değişikliği, çevre ve atmosfer kirlenmesi, canlı varlıkların yaşam koşullarının yok olması gibi bir takım olumsuz gelişmeleri doğurmuştur. Bu olumsuz gelişmelerin önüne geçilebilmesi için güneş enerjisi, nükleer enerji ve jeotermal enerji gibi temiz ve tükenmez enerjilerin kullanımının yaygınlaştırılması gerekmektedir. Bu enerjilerin kullanımının yaygınlaştırılabilmesi için her türlü ısıyı mekanik enerjiye dönüştürebilen bir makinenin geliştirilmesi gerekmektedir. Bu amaçla geliştirilmeye çalışılan makinelerden birisi de Stirling motorlarıdır. Stirling motorları hâlihazırda endüstriyel boyutta kullanılan bir makine olmamakla birlikte, üzerinde en çok araştırma yapılan enerji dönüşüm makinelerinden birisidir. Bu araştırmada, krank kaydırma esasına göre çalışan alfa tipi bir Stirling motorunun termodinamik performansı; iş akışkanı olan Helyumun kütlesi, silindirlerin uzunluğu, krank kaydırmanın miktarı, silindirlerin rölatif konumu, biyellerin uzunlukları ve ısıtıcı sıcaklığına bağlı olarak incelenmiştir. Yapılan incelemede kullanılan matematik model; kinematik ilişkiler, termodinamiğin birinci kanunu, ideal gazların hal denklemi, kütlenin korunumu yasası ve Schmidt formülünden oluşmaktadır. Helyum kütlesi 3,5 g, ısıtıcı sıcaklığı 800 K, silindir tepesi ile krank merkezi arasındaki uzaklık 328,5 mm, biyel uzunluğu 171 mm ve krank kaçıklığı 40 mm olarak atandığında; iş 223 J, ortalama basınç 24,9 bar, motor gücü 3,55 kW ve ısıl verim %52 olarak belirlenmiştir.

show abstract

Thermodynamic analysis of rhombic‐driven and crank‐driven beta‐type Stirling engines

Cited by 13 publications

References 30 publications

Development of a compact simple unpressurized Watt‐level low‐temperature‐differential Stirling engine

Development of a compact simple unpressurized Watt‐level low‐temperature‐differential Stirling engine

Energy and Exergy Analyses of Stirling Engine using CFD Approach

Krank kaydırmalı bir stirling motorunun termodinamik performansının nodal analiz ile incelenmesi

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