A thermodynamic comparison between heat pump and refrigeration device using several refrigerants

Afshari, Faraz; Çomaklı, Ömer; Karagöz, Şendoğan; Zavaragh, Hadi Ghasemi

doi:10.1016/j.enbuild.2018.03.037

Cited by 27 publications

(10 citation statements)

References 41 publications

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“…Therefore, in the study, the effect of anti-fog film on the freezer cabinet windows on energy consumption was investigated and the energy efficiency index (EEI) value was calculated. The energy efficiency index "(EEI)" means an index value calculated in percent (%) for the relative energy efficiency of an industrial refrigerator with a direct sales function [22] and based on this value, an energy label is applied to industrial refrigerators.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study Towards Decreasing the Energy Efficiency Index Value in Industrial Refrigerators

Bahar

Erten

Aktaş

2021

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Energy labeling is performed according to the energy efficiency index (EEI) value in industrial refrigerators. In order to reduce the EEI value calculated according to the amount of energy consumed and the characteristics of the cooler, two systems were designed in this study and the energy label class of the coolers was determined according to the results obtained. Two systems were designed in this study and the energy label class of the refrigerators was determined according to the obtained results. In this study, two different refrigerators (Type 1 and Type 2) were designed, manufactured and tested. The systems are designed using R290 (propane). It is a new generation natural and environmentally friendly refrigerant with two inlet-outlet evaporators, double condensers and double compressors that provide a homogeneous refrigeration. During the experiments, temperature-pressure measurements of the cooled products and refrigeration system equipment were taken from certain points every minute and test data were recorded. In the experiments, the average air temperature and relative humidity values of the test chamber of the experiment with resistance glass in the Type 1refrigerator were measured as 25 o C and 59,09%, respectively, the average air temperature and relative humidity values of the test room of the Type 2 system experiment with antifogging film were measured as 25,231 o C and 57,207%, respectively. In the experiments, defrosting process was carried out twice a day in the refrigerators. During the experiment, the highest and lowest average temperatures of the cooled products were measured as -16,18 o C and -19,40 o C. Increasing product temperatures during defrosting and stopping cooling increased the power consumption in the system. As a result of the calculations, the energy efficiency index value of the Type 1 resistance model was calculated to be 60,53 and it was seen that the energy label was class "E". In the Type 2 model in which anti-fog coating film is used, the energy efficiency index value is 49,25 and it has been observed that the energy label is class "D".

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Section: Introductionmentioning

confidence: 99%

An Experimental Study Towards Decreasing the Energy Efficiency Index Value in Industrial Refrigerators

Bahar

Erten

Aktaş

2021

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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“…Therefore, renewable and alternative energy resources and also efficient energy systems gain importance not only because of limited fossil resources, but also because of pollutant gas emissions. Approximately 40% of annual energy consumption is used in residential buildings and a major part of energy is used for space heating and hot water providing in buildings [1,2]. Generally hot water and space heating in buildings are supplied by combi boilers.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Environmental Effects of Conventional and Condensing Combi Boilers Using Natural Gas

Variyenli

Khanları

2020

Politeknik Dergisi

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“…Afshari vd. (2018) farklı soğutucu akışkanların soğutma ve ısıtma üzerindeki etkilerini deneysel olarak incelemiştir [13]. Başka bir çalışmada Afshari vd.…”

Section: Introductionunclassified

Soğutma Sistemlerindeki Kondenseri Yoğuşma Suyu ile Soğutarak Performansın Arttırılması: Adıyaman İli Örneği

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Khanları

et al. 2020

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Soğutma sistemlerinde ilk yatırım ve işletme maliyetleri ısıtma sistemlerine göre daha yüksektir. Bu nedenle soğutma sistemlerinde yapılacak verimlilik çalışmaları ısıtma sistemlerine göre daha faydalı olacaktır. Kondenser üzerindeki sıcaklığın yüksek olması dış ortam koşullarına bağlı olarak ısısını yeteri kadar atamamasının bir göstergesidir. Isısını istenilen düzeyde atamayan soğutucu akışkan tamamen sıvı hale dönüşmez. Bu da soğutma sisteminin verimini düşürür. Bu çalışmada klima iç ünitesinde oluşan yoğuşma suyunun kondensere aktarılmasının soğutma etkinliği üzerinde olan etkisi deneysel olarak araştırılmıştır. Bu bağlamda, 9000 BTU/h inverter split klimanın soğutma modunda çalışırken evaporatör üzerinde oluşan yoğuşma suyunun kondensere aktarılması sonucunda enerji tüketimi, ortama üfleme sıcaklığı, evaporatör emme sıcaklığı, kondenser üfleme sıcaklığı, kompresör gaz çıkış basıncı, evaporatör gaz giriş ve çıkış basıncı üzerinde etkisi incelenmiştir. Kondenserin üzerine aktarılan yoğuşma suyu soğutucu akışkanın yoğuşmasını kolaylaştırmış, harcanan elektrik sarfiyatında ve evaporatör üfleme sıcaklığında belli bir miktar düşüş sağlamıştır. Evaporatör üfleme sıcaklığının normal sisteme göre %5-10.8 arasında düştüğü kaydedilmiştir. Üfleme sıcaklığına bağlı olarak soğutulan mahalin sıcaklığında da ortalama %8 olarak düştüğü görülmüştür. Sonuçlara göre soğutulan mahaldeki sıcaklığın azalma oranının dış ortamın nem ve sıcaklığına bağlı olduğu tespit edilmiştir. Ayrıca, kondenser üfleme sıcaklığının maksimum %6.4 düştüğü tespit edilmiştir.

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A thermodynamic comparison between heat pump and refrigeration device using several refrigerants

Cited by 27 publications

References 41 publications

An Experimental Study Towards Decreasing the Energy Efficiency Index Value in Industrial Refrigerators

An Experimental Study Towards Decreasing the Energy Efficiency Index Value in Industrial Refrigerators

Analyzing the Environmental Effects of Conventional and Condensing Combi Boilers Using Natural Gas

Soğutma Sistemlerindeki Kondenseri Yoğuşma Suyu ile Soğutarak Performansın Arttırılması: Adıyaman İli Örneği

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