A thermodynamic evaluation on high pressure condenser of double effect absorption refrigeration system

Yılmaz, İbrahim Halil; Saka, Kenan; Kaynaklı, Ömer

doi:10.1016/j.energy.2016.07.133

Cited by 15 publications

(5 citation statements)

References 23 publications

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“…A numerical comparison with relevant literature is also provided. The literature has previously demonstrated the validity of the algorithm used to calculate energy and exergy based on the associated equations [17][18][19]. The absorber exhibited the highest load among the components, while the pump exhibited the lowest load.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

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A Quantitative Examination of the Efficiency of a Biogas-Based Cooling System in Rural Regions

Saka

2023

Processes

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This study investigates the efficiency of a biogas-powered cooling system through the utilization of energy and exergy calculations. Biogas, which can be generated and stored in small-scale plants as needed, serves as a viable fuel source for absorption cooling systems. The present research focuses on the biogas consumption of a triple-effect absorption cooling system specifically designed to supply a fixed cooling load of 100 kW under varying operational conditions. This study highlights the coefficient of performance and exergetic coefficient of performance values of the system, along with the exergy destruction rates of its individual components, at the optimal temperatures of operation. Furthermore, to determine necessary biogas consumption, this study explores the establishment of dedicated farms for various animal species, ensuring an adequate number of animals for biogas production. The findings reveal a coefficient of performance of 1.78 and an exergetic coefficient of performance of 35.4% at the optimized operating temperatures. The minimum mass flow rate of biogas is determined to be 0.0034 kgs−1, facilitating the operation of the boiler with a methane content of 65%. This study concludes that a total of 290 head of cattle is required to generate the annual biogas consumption necessary for the cooling system. Additionally, the number of the cattle is enough to establish 284 biogas plants in Bursa Province in Türkiye.

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Section: Thermodynamic Analysismentioning

confidence: 99%

“…Yılmaz et al [18] investigated the internal thermal balance of a double-effect absorption cycle. They demonstrated that properly designating the high-pressure condenser temperature enhances the COP and ECOP due to its significant impact.…”

Section: Introductionmentioning

confidence: 99%

A Quantitative Examination of the Efficiency of a Biogas-Based Cooling System in Rural Regions

Saka

2023

Processes

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“…Cross-flow heat exchangers are commonly used in gas heating or cooling including such refrigeration systems [19,20]. A tube bundle carries a heating or cooling fluid (either gas or liquid), normally perpendicular to a gas flow which passes over the tubes and allows heat to be transferred between the fluids.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of heat transfer using twisted tape insert in a plain tube

Yılmaz

Göksu

2019

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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The use of insert within a tube is one of the techniques enhancing the convective heat transfer coefficient at the expense of hydraulic loss penalty. This mutual effect which is a strong function of insert geometry and flow conditions is to be analyzed in detail to improve the overall system performance. This study presents a numerical investigation for analyzing the thermo-hydraulic characteristics of twisted tape insert in a plain tube (with a 13mm-diameter and 1200-mm-long) which is widely used in refrigeration applications where the compactness of the heating/cooling component is significant. The effect of twist ratio on the thermo-hydraulic performance was conducted for the Reynolds number range of 5,025−14,871 where most of refrigeration applications are operated in. The verification of the simulation results was compared to Dittus-Boelter empirical equation (for the plain tube case) and good agreement was obtained. Results indicate that the variation of the twist ratio between 6−9 increases the friction factor and Nusselt number 197−245%, 180−220%, 163−189% and 156−179%, and 32−54%, 28−46%, 28−33% and 28−33% relative to the plain tube case, respectively for the specified operating conditions. The performance evaluation criteria, which are measure of enhancing heat transfer against hydrodynamic forces, changed between 0.90−1.02, 0.89−1.00, 0.91−0.96 and 0.92−0.96 based on the twist ratio rise. The maximum enhancement in the performance evaluation criteria was obtained at the lowest Reynolds number and twist ratio. The performance evaluation criteria lower with increasing Reynolds number but can be increased by increasing the twist ratio.

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“…Yılmaz vd. [3] ise çift kademeli bir sisteme ait yüksek basınçlı yoğuşturucu üzerine odaklanmıştır. Yaptıkları analizde yüksek basınçlı yoğuşturucu ve düşük basınçlı kaynatıcı arasındaki termal ilişkide yüksek basınçlı yoğuşturucu düşük basınçlı kaynatıcıdan daha yüksek sıcaklıkta çalışmaktadır.…”

Section: Introductionunclassified

Energy and Exergy Analysis of a Triple Effect Absorption Refrigeration System

Saka¹

2019

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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ÖzSoğurmalı soğutma sistemleri atık ısı kullanarak soğutma yapmanın en etkili yollarından birini sunmaktadırlar. Yapısal açıdan soğurmalı soğutma sistemleri tek, çift ve üç kademeli olarak tasarlanırlar. Üç kademeli soğurmalı soğutma sistemleri çift ve tek kademeli soğurmalı soğutma sistemlerinden daha verimlidirler. Fakat bu sistemler daha fazla sistem elemanına sahip ve termodinamik açıdan daha karmaşıktırlar. Bu çalışmada üç kademeli bir soğurmalı soğutma sisteminin enerji ve ekserji analizleri yapılmıştır. İncelenen sistem seri akışlı ve lityum bromür su çözeltisiyle çalışmaktadır. Ek olarak üç farklı ısı değiştiricisi yardımıyla sistem içerisinde ısı kazanımı sağlanmıştır. Yapılan analizde düşük basınçlı kaynatıcı sıcaklığına bağlı olarak sistem elemanlarının ekserji yıkımları ve sistemin toplam ekserji yıkımındaki değişim gösterilmiştir. Ayrıca birinci ve ikinci kanun verimliliğinde meydana gelen değişimde artış ve azalış olarak analiz sonuçlarına eklenmiştir. Sonuç olarak düşük basınçlı kaynatıcı sıcaklığının artmasıyla sistemin toplam ekserji yıkımında azalma olmuştur. Sistemin toplam ekserji yıkımındaki azalma birinci ve ikinci kanun verimliliklerine artış olarak yansımıştır. Sistem elemanları içerisinde yüksek ve düşük basınçlı kaynatıcıya ait ekserji yıkımında azalma meydana gelirken absorbere ait ekserji yıkımında ise artma olmuştur. Isı geri kazanımı sağlayan ısı değiştiricilere ait ekserji yıkımlarında ise azalma görülmüştür.

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A thermodynamic evaluation on high pressure condenser of double effect absorption refrigeration system

Cited by 15 publications

References 23 publications

A Quantitative Examination of the Efficiency of a Biogas-Based Cooling System in Rural Regions

A Quantitative Examination of the Efficiency of a Biogas-Based Cooling System in Rural Regions

Enhancement of heat transfer using twisted tape insert in a plain tube

Energy and Exergy Analysis of a Triple Effect Absorption Refrigeration System

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