The aim of our study
is to propose a theoretical model to analyze the energy efficient and
environment friendly cascade system for various refrigerant pairs. In order to
realize, the optimum cascade evaporation temperature (TOPT,CAS,E)
which maximize the performance, COP values are
determined for different refrigerant pairs of the system. After the optimization,
two different cases have been investigated through a thermodynamic analysis to
discover the best refrigerant pair for the system. Natural refrigerant CO2
is selected instead of R404A which has high Global Warming Potential (GWP)
value for the low temperature cycle (LTC). On the other hand, synthetic
refrigerants (R134a, R152a) and a natural refrigerant (NH3) are
chosen for the high temperature cycle (HTC). In order to determine, an energy
efficient and environmentally friendly cascade system, R134a/CO2,
R152a/CO2 and NH3/CO2 refrigerant pairs are
investigated in Case 1. On the other hand, R134a/R404A,
R152a/R404A and NH3/R404A refrigerant pairs are investigated in Case
2. In calculations, the evaporation temperature (TE) is varied from
-20oC to -40oC in LTC. The condensation temperature (TC)
is considered to be between 30oC and 45oC in HTC. Mass
flow rate requirements of systems for various refrigeration capacities (QEvap)
are calculated for different refrigerant pairs. Moreover, the COPmax
and total equivalent warming impact (TEWI) values of the system’s refrigerant
pairs are evaluated and compared for various operating conditions.
Birincil Dil | İngilizce |
---|---|
Konular | Kimya Mühendisliği |
Bölüm | Makaleler |
Yazarlar | |
Yayımlanma Tarihi | 15 Kasım 2019 |
Gönderilme Tarihi | 12 Kasım 2018 |
Kabul Tarihi | 27 Temmuz 2019 |
Yayımlandığı Sayı | Yıl 2019 Cilt: 2 Sayı: 2 |
This piece of scholarly information is licensed under Creative Commons Atıf-GayriTicari-AynıLisanslaPaylaş 4.0 Uluslararası Lisansı.
J. Turk. Chem. Soc., Sect. B: Chem. Eng. (JOTCSB)