Experimental Examination of Cooling System Performance with Eutectic Water-Salt Solutions as Phase Change Materials

Year 2024, Volume: 10 Issue: 2, 367 - 379, 25.06.2024

Berçem Kıran Yıldırım , Gökçe Güner Karaali , Özgenur Yayla , Elif Yıldız , Ebru Mancuhan , Sibel Sargut

https://doi.org/10.28979/jarnas.1383506

Abstract

Household refrigerators are responsible for a huge amount of energy consumption due to their widespread use as household appliances and continuous operation. A laboratory-scale cooling system was operated at an average temperature of 4°C to investigate the performance of a household refrigerator without phase change material (PCM) and with various PCMs. Dipotassium hydrogen phosphate (K2HPO4) and sodium thiosulfate (Na2S2O3) solutions were integrated into the system at different concentrations as eutectic water-salt solution PCMs. It was revealed that the running time, determined to be 18.8% without PCM, decreased with the eutectic water-salt solutions prepared at suitable concentrations as PCMs. The running time (%) was minimized with 2.0 wt.% K2HPO4 solution. The running time was determined to be 11.1% with 2.0 wt.% K2HPO4 solution. The energy consumption was reduced by approximately 46% with 2.0 wt.% K2HPO4 solution than that of the case without PCM for a 4-hour operating period of the system. In the case of simulating a power failure, it was also determined that the time for reaching the cabin air temperature to ambient temperature (16℃) was prolonged with PCMs, and it was maximized to a value of approximately 5 times longer than that of the case without PCM. All evaluations indicate that the integration of suitable PCM into household refrigeration is of great importance in terms of reducing energy consumption. The integration of PCMs into systems will provide another advantage by ensuring the long-term preservation of products inside the cabinet during a power failure period.

Keywords

Cooling system performance, eutectic water-salt solutions, household refrigerator, phase change materials

Project Number

1919B012203087

Faz Değiştiren Malzeme Olarak Ötektik Su-Tuz Çözeltileri ile Soğutma Sistem Performansının Deneysel İncelenmesi

Abstract

Ev-tipi buzdolapları yaygın kullanılan beyaz eşyalar arasında yer alması ve sürekli çalışmaları sebebiyle yüksek miktarda enerji tüketiminden sorumludurlar. Ev-tipi buzdolabının performansını incelemek için laboratuvar ölçekli bir soğutma sistemi ortalama 4°C sıcaklıkta faz değiştiren malzemesiz (FDM’siz) ve çeşitli FDM’lerle test edilmiştir. FDM olarak ötektik su-tuz çözeltilerinden dipotasyum hidrojenfosfat (K2HPO4) ve sodyum tiyosülfat (Na2S2O3) çözeltileri farklı konsantrasyonlarda sisteme entegre edilmiştir. FDM’siz durumda %18,8 tespit edilen çalışma süresinin FDM olarak, uygun konsantrasyonlarda hazırlanan ötektik su-tuz çözeltileri ile azaldığı ortaya konulmuştur. FDM olarak ağırlıkça (ağ.) %2,0 K2HPO4 çözeltisi ile çalışma süresi (%) minimize edilmiştir. Çalışma süresi ağ. %2,0 K2HPO4 çözeltisi ile %11,1 olarak tespit edilmiştir. FDM’siz durumda sistemin 4 saatlik çalışma süresinde belirlenen toplam enerji tüketimi ağ. %2,0 K2HPO4 çözeltisi ile yaklaşık %46 oranında azaltılmıştır. Elektrik kesintisinin simüle edildiği durumda ise FDM’ler sisteme entegre edildiğinde kabin iç hava sıcaklığının ortam sıcaklığına (16℃) yükselme süresinin uzadığı ve maksimim olduğu durumda bu süresinin FDM’siz duruma göre yaklaşık 5 kat uzadığı belirlenmiştir. Tüm değerlendirmeler uygun FDM’nin ev-tipi buzdolaplarına entegrasyonun enerji tüketiminin azaltılmasında önemli rol oynacağı ortaya konulmuştur. Elektrik kesintisi periyodunda, kabin içindeki ürünlerin uzun süre bozunmadan muhafaza edilmesi FDM’lerin sistemlere entegrasyonunda sağlanacak diğer bir avantaj olacaktır.

Keywords

Ev-tipi buzdolabı, faz değiştiren malzemeler, soğutma sistem performansı, ötektik su-tuz çözeltileri

Ethical Statement

Çıkar Çatışması Yazarlar çıkar çatışması olmadığını beyan etmektedir.

Supporting Institution

TÜBİTAK Bilim İnsanı Destek Programları Başkanlığı (BİDEB)

Project Number

1919B012203087

Thanks

Bu çalışma 1919B012203087 Proje Numarasıyla TÜBİTAK Bilim İnsanı Destek Programları Başkanlığı (BİDEB) tarafından yürütülen, 2209-A Üniversite Öğrencileri Araştırma Projeleri Destekleme Programı kapsamında desteklenmiştir.

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