Irreversibility Analysis of a Minibus Air-Conditioner for Different Condensation Pressures


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KARAÇAYLI İ. , ŞİMŞEK E.

Çukurova Üniversitesi Mühendislik-Mimarlik Fakültesi Dergisi, cilt.34, ss.171-180, 2019 (Diğer Kurumların Hakemli Dergileri)

  • Cilt numarası: 34 Konu: 2
  • Basım Tarihi: 2019
  • Dergi Adı: Çukurova Üniversitesi Mühendislik-Mimarlik Fakültesi Dergisi
  • Sayfa Sayıları: ss.171-180

Özet

In this study, a minibus air conditioning (MAC) set using R134a was tested and evaluated in the Adana High Vocational School, Çukurova University. The condensation pressure was gradually increased from 650 kPa to 770 kPa. The indoor and outdoor temperatures were kept constant at 20 oC and 22 oC, respectively. The cooling capacity of the MAC is 6000 kcal/h at 35℃ ambient temperature. The MAC consists of four main elements; a compressor, a condenser, an expansion valve and an evaporator. The purpose of this study is to demonstrate how the irreversibility analysis is performed. For this aim, experiments were carried out for different condensation pressures at constant ambient temperature in order to determine the rates of the exergy transfer and the entropy generation within the all components and the MAC system. In addition to this, the rational exergy efficiency of the all components and the whole system were calculated. Increasing condensation pressure caused 8.3% increase in both the rate of entropy generation and the irreversibility rate for the whole system. Besides, the rational exergy efficiency of the whole system was approximately 24%