ENERGY AND ENVIRONMENTAL ANALYSIS OF TRANSCRITICAL CO2 SUPERMARKET REFRIGERATION CYCLES WITH DEDICATED MECHANICAL SUBCOOLER

Oğuz Çalışkan; H. Kürşad Ersoy

doi:10.17780/ksujes.1477931

EN TR

ENERGY AND ENVIRONMENTAL ANALYSIS OF TRANSCRITICAL CO2 SUPERMARKET REFRIGERATION CYCLES WITH DEDICATED MECHANICAL SUBCOOLER

Abstract

Refrigerants with high environmental impact are being prohibited by legal authorities. The commercial refrigeration sector, a huge contributor to emissions, is transitioning to environmentally friendly CO2 systems. Despite the environmental benefits of CO2, its low critical temperature and high operation pressure can lead to lower performance in warm climates compared to other refrigerants. Therefore, performance improvements are being made for transcritical CO2 refrigeration cycles. This paper presents energy and environmental analysis of transcritical booster (BRC), parallel compression (PRC), and ejector expansion (ERC) supermarket refrigeration cycles with dedicated mechanical subcooler (DMS) as well as transcritical cycles without DMS circuits, and subcritical R404A conventional system. R134a, R1234yf, and R290 were studied as working fluids for DMS circuits. Annual energy consumption and total equivalent warming impact (TEWI) values were compared for İstanbul, Konya, and Samsun in Türkiye, which are in different climate zones, as a case study. The case study constitutes the novelty of this paper. Up to 11% annual energy savings were obtained using CO2 cycles with DMS compared to R404A conventional system. CO2 cycles have up to 58.4% lower total TEWI values than R404A conventional system

Keywords

ÖZEL MEKANİK AŞIRI SOĞUTUCULU TRANSKRİTİK CO2 SÜPERMARKET SOĞUTMA ÇEVRİMLERİNİN ENERJİ VE ÇEVRESEL ANALİZİ

Öz

Yüksek çevresel etkiye sahip soğutucu akışkanlar resmi otoriteler tarafından yasaklanmaktadır. Emisyonlara büyük katkıda bulunan ticari soğutma sektörü, çevre dostu CO2 sistemlerine geçiş yapmaktadır. Çevresel faydalarına rağmen CO2’nin düşük kritik sıcaklığı ve yüksek çalışma basıncı, sıcak iklimlerde diğer soğutucu akışkanlara kıyasla daha düşük performansa yol açabilir. Bu nedenle transkritik CO2 soğutma çevrimleri için performans iyileştirmeleri yapılmaktadır. Bu makale, özel mekanik aşırı soğutuculu (DMS) çift kademeli (BRC), paralel sıkıştırmalı (PRC) ve ejektör genleşmeli (ERC) transkritik süpermarket soğutma çevrimlerinin yanı sıra DMS’siz çevrimlerin ve kritik nokta altı klasik R404A sistemin enerji ve çevresel analizini sunmaktadır. DMS devreleri için iş akışkanı olarak R134a, R1234yf ve R290 incelenmiştir. Yıllık enerji tüketimi ve toplam eşdeğer ısınma etkisi (TEWI) değerleri, bir uygulama örneği olarak Türkiye'de farklı iklim bölgelerinde yer alan İstanbul, Konya ve Samsun için karşılaştırılmıştır. Uygulama örneği bu çalışmanın özgünlüğünü oluşturmaktadır. R404A klasik sisteme kıyasla DMS'li CO2 çevrimleri kullanılarak yıllık %11'e varan enerji tasarrufu elde edilmiştir. CO2 çevrimleri, R404A klasik sisteme göre %58.4'e kadar daha düşük toplam TEWI değerlerine sahiptir.

Anahtar Kelimeler

Kaynakça

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Ayrıntılar

Birincil Dil

İngilizce

Konular

Enerji Üretimi, Dönüşüm ve Depolama (Kimyasal ve Elektiksel hariç)

Bölüm

Araştırma Makalesi

Yazarlar

Oğuz Çalışkan ^*
0000-0002-3364-1360
Türkiye

H. Kürşad Ersoy
0000-0001-8588-296X
Türkiye

Yayımlanma Tarihi

3 Aralık 2024

Gönderilme Tarihi

3 Mayıs 2024

Kabul Tarihi

7 Ekim 2024

Yayımlandığı Sayı

Yıl 2024 Cilt: 27 Sayı: 4

DOI

https://doi.org/10.17780/ksujes.1477931

IZ

https://izlik.org/JA67PX59RP

Kaynak Göster

RIS / Bibtex

APA

Çalışkan, O., & Ersoy, H. K. (2024). ENERGY AND ENVIRONMENTAL ANALYSIS OF TRANSCRITICAL CO2 SUPERMARKET REFRIGERATION CYCLES WITH DEDICATED MECHANICAL SUBCOOLER. Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi, 27(4), 1582-1601. https://doi.org/10.17780/ksujes.1477931

Cited By

A Novel Ejector Intercooler Refrigeration Cycle Integrated With a Transcritical CO2 Rankine Cycle for Low-Temperature: Energy, Exergy, Environmental, and Enviroeconomic Analysis

Journal of Thermal Science and Engineering Applications

https://doi.org/10.1115/1.4070981