Exergetic modeling and experimental performance assessment of a novel desiccant cooling system

Hürdoğan, Ertaç; Büyükalaca, Orhan; Hepbaşlı, Arif; Yılmaz, Tuncay

doi:10.1016/j.enbuild.2011.02.016

Cited by 48 publications

(18 citation statements)

References 33 publications

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“…The work of Kanoglu et al [17] shows that the desiccant wheel and the heating source took 33.8% and 31.2% of the total exergy destruction, respectively. Similar results can be found in the experiment study of Hürdogan et al [14], where the electrical heater took almost 70% of the total exergy destruction. Sheng et al [18] found that when the electrical heater was replaced by the heat pump, exergy efficiency was increased by nearly 50%.…”

Section: Introductionsupporting

confidence: 78%

“…The coefficient of performance (COP) of the systems is defined as the ratio between the cooling capacity obtained and total energy input In this study, since electric heaters are used to simulate regeneration heat source, the heat input for the regeneration is almost same as power consumption of electric heaters ( Electric heater capacity of a desiccant cooling system is obtained from: General mass, energy, entropy and exergy balance equations are given in more detail elsewhere [14], while the following section covers the relations on the system component basis illustrated in Fig. 1 is reported in Table 2.…”

Section: -20mentioning

confidence: 99%

“…Exergy analysis has be conducted for desiccant cooling systems by many researchers [12][13][14][15][16]. La et al [12,16] investigated the performances of a ventilation system from the perspective of exergy destructions.…”

Section: Introductionmentioning

confidence: 99%

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Second Law Analysis of an Adsorption Air-Conditioning System

Hürdoğan¹,

Kara²,

Kula³

et al. 2016

CSJ

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Abstract. Air conditioning systems are designed to improve people's living standards and provide comfort. The use of this system brings together with environmental problems, energy consumption and costs. These problems can be reduced by making studies on energy efficiency and saving in air conditioning systems. Adsorption (dehumidification, desiccant) air conditioning systems, which have widely being used in recent years, can be evaluated in terms of energy efficiency. In this study, a desiccant based air-conditioning system was considered to evaluate the system performance by using second law analysis (exergy analysis) for Yozgat province. Psychometric properties for each state and system performance parameters were calculated using Engineering Equation Solver (EES). It was found from the results that maximum exergy destruction occurs in electric heater unit and the total exergy destruction of the system is 24.66 kW. It was also found that the exergy efficiency of this system is 19.87 %. The results showed that this system can be used for air conditioning in Yozgat climate conditions and the performance of the system can be increased by using waste heat or renewable energy resources for regeneration heat.Keywords Air conditioning, Second law analysis, exergy, irreversibility Adsorbsiyonlu Bir İklimlendirme Sisteminin İkinci Yasa AnaliziÖzet. İklimlendirme sistemleri insanların yaşam standartlarını yükseltmek ve konfor sağlamak için tasarlanmaktadır. Bu sistemlerin kullanımı enerji tüketimi, enerji maliyetleri ve çevre problemlerini de beraberinde getirir. Bu problemler, iklimlendirme sistemlerinde enerji verimliliği ve tasarrufuna yönelik çalışmalar yapılarak azaltılabilmektedir. Enerji verimliliği açısından değerlendirilebilecek iklimlendirme sistemlerinden biride son yıllarda yaygın bir şekilde kullanılmakta olan adsorbsiyonlu (nem almalı, desisif) iklimlendirme sistemleridir. Bu çalışmada, nem almalı bir iklimlendirme sistemi ele alınarak sistem performansı, ikinci yasa analizi (ekserji analizi) yapılarak Yozgat iklim şartları için değerlendirilmiştir. Sistemde bulunan bütün noktaların psikrometrik özellikleri ve sistem performans parametreleri, Engineering Equation Solver (EES) programı kullanılarak hesaplanmıştır. Yapılan çalışma sonunda ele alınan sistemde en çok tersinmezliğin (ekserji yıkımı) ısıtma ünitesinde meydana geldiği ve sistemin toplam tersinmezliğin 24.66 kW olduğu tespit edilmiştir. Ayrıca sistem ikinci yasa (ekserji) verimi %19.87 olarak hesaplanmıştır. Elde edilen sonuçlardan sistemin Yozgat iklim şartlarında iklimlendirme uygulamalarında kullanılabileceği ayrıca bu tür sistemlerde rejenerasyon ısısının elde edilmesinde atık ısı veya yenilenebilir enerji kaynaklarının kullanımıyla sistem performansının arttırılabileceği belirlenmiştir.

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Section: Introductionsupporting

confidence: 78%

Section: -20mentioning

confidence: 99%

See 1 more Smart Citation

Second Law Analysis of an Adsorption Air-Conditioning System

Hürdoğan¹,

Kara²,

Kula³

et al. 2016

CSJ

Self Cite

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show abstract

“…Exergy analysis is employed to detect and to evaluate quantitatively the causes of the thermodynamic imperfection of the process under consideration. Exergy analysis has been applied to different types of air conditioning systems by various researchers [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Değişken Soğutucu Akışkan Debili Bir Sistemin Performans ve Ekonomik Analizi

Hürdoğan¹

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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This study deals with the exergetic modeling and performance/cost evaluation of a variable refrigerant flow (VRF) air conditioning system. An experimental setup was established to investigate the system performance under cooling conditions. System mainly consists of one outdoor unit and two indoor units. Outdoor unit equipped with two compressors (one variable speed and one constant speed), condenser, and four way valve is connected to two indoor units. Exergy, cost, energy and mass (EXCEM) analysis was applied to this system for the first time to the best of the authors` knowledge. The relations between thermodynamic losses and capital costs were also parametrically investigated. Experimental results show that the greatest irreversibility (exergy destruction) occurs in the condenser, followed by the evaporators. Exergy efficiency of the whole system on the exergetic product/fuel basis was calculated to be 85.84% at a reference state temperature of 25 o C. Exergy efficiency and exergy loss rate were in the range of 85.27-86.55% and 0.919-0.916 MW/USD, respectively, based upon the conditions and parameters considered in the present study. Keywords: Variable refrigerant flow, Energy analysis, Exergy analysis, Exergoeconomic Değişken Soğutucu Akışkan Debili Bir Sistemin Performans ve Ekonomik Analizi ÖzBu çalışma kapsamında, değişken soğutucu akışkan debili (VRF) bir klima sisteminin ekserjetik modellemesi ve performans değerlendirmesi ele alınmıştır. Soğutma koşulları için sistem performansını araştırılabilmek için bir deney düzeneği kurulmuştur. Sistem esas olarak bir dış üniteden ve iki iç üniteden oluşmaktadır. Ġki adet kompresör (bir değişken hız ve bir sabit hız), konderser ve dört yollu valf ile donatılmış dış ünite, iki içi üniteye bağlanmıştır. Bu çalışmada sisteme ekserji, maliyet, enerji ve kütle (EXCEM) analizi uygulanmış ve termodinamik kayıplar ile maliyetler arasındaki ilişkiler parametrik

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“…Huaedogan et al [30] dealt with the performance analysis and evaluation of a novel desiccant cooling system using exergy analysis method. Ehyaei et al [31] investigated the effects of inlet fogging system on the first and second law efficiencies for a typical power plant.…”

Section: Introductionmentioning

confidence: 99%

Exergy Analysis of Overspray Process in Gas Turbine Systems

Kim

2012

Energies

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Gas turbine power can be augmented by overspray process which consists of inlet fogging and wet compression. In this study exergy analysis of the overspray process in gas turbine system is carried out with a non-equilibrium analytical modeling based on droplet evaporation and the second law of thermodynamics. This work focuses on the effects of system parameters such as pressure ratio, water injection ratio, and initial droplet diameter on exergetical performances including irreversibility and exergy efficiency of the process. The process performances are also estimated under the condition of saturated water injection ratio above which complete evaporation of injected water droplets within a compressor is not possible. The results show that the irreversibility increases but the saturated irreversibility decreases with increasing initial droplet diameter for a specified pressure ratio.

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Exergetic modeling and experimental performance assessment of a novel desiccant cooling system

Cited by 48 publications

References 33 publications

Second Law Analysis of an Adsorption Air-Conditioning System

Second Law Analysis of an Adsorption Air-Conditioning System

Değişken Soğutucu Akışkan Debili Bir Sistemin Performans ve Ekonomik Analizi

Exergy Analysis of Overspray Process in Gas Turbine Systems

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