Abstract:Performance of two ozone-friendly refrigerants (R410A and R419A) was investigated theoretically using computational thermodynamic analysis. The results obtained showed that the performance of R410A was very close to that of R22 in all the operating conditions. Both R22 and R410A performed better than R419A in terms of their COP and refrigerating effect. Compared with R22, the average COP and refrigerating effect of R419A are lower by 13.78 and 33.96%, respectively. Generally, R410A refrigerant has approximatel… Show more
“…The data collected at different evaporating temperatures and the corresponding properties of refrigerants obtained using refrigerant database software known as REFPROP [20] were used to compute the following performance parameters (Eqs. 1 to 7): refrigerating effect (Q evap ), compressor work input (W comp ), condenser heat load (Q cond ), Coefficient of Performance (COP), Volumetric Cooling Capacity (VCC) and Pressure Ratio (PR).…”
Section: Analysis Of the Heat Transfer In The Refrigeration System / mentioning
confidence: 99%
“…The Volumetric Cooling Capacity (VCC, kJ/m 3 ) is the refrigerating effect per unit volume of refrigerant at the inlet of the compressor. It is a value calculated from the vapour density at the compressor's inlet and the enthalpy difference of the evaporation [20]:…”
Section: Analysis Of the Heat Transfer In The Refrigeration System / mentioning
Halocarbon refrigerants have been scheduled for total phase out because they contributed significantly to the two major global environmental problemsozone layer depletion and global warming. In this study, the performances of the environmentally friendly R510A and R600a in a retrofitted domestic refrigerating system were investigated experimentally and compared with the performance of R134a. The results obtained showed that R510A has the lowest discharge pressure with an average value of 13,4 % lower than that of R134a. The average pressure ratios of R510A and R600a were 16,91 and 12,17 %, respectively, lower than that of R134a. The Volumetric Cooling Capacity obtained for R510A was 5,34 % higher than that of R134a. R510A and R600a exhibited higher refrigerating effect and Coefficient of Performance (COP) than R134a.The average COPs for R510A and R600a were 22,26 and 3,06 %, respectively, higher than that of R134a. Generally, R510A and R600a performed better than R134a and they can be used as retrofit substitute refrigerants for R134a in the existing domestic refrigerators. The best performance was obtained from the use of R510A in the retrofitted system. Sažetak Halougljične radne tvari planiraju se potpuno izbaciti iz uporabe jer su znatno pridonijele dvama svjetskim ekološkim problemima-razaranju ozonskoga omotača i globalnome zatopljenju. U ovoj studiji eksperimentalno su ispitivana svojstva ekološki prihvatljivih radnih tvari R510A i R600a u modificiranome kućnome hladnjaku i uspoređena su sa svojstvima R134a. Dobiveni rezultati pokazali su da R510A ima najniži kondezatorski tlak s prosječno 13,4 % nižom vrijednošću od R134a. Prosječni kompresijski omjeri za R510A i R600 bili su 16,91 i 12,17 % niži nego za R134a. Volumetrijski rashladni kapacitet dobiven s R510A bio je 5,34 % viši nego s R134a. R510A i R600a postigli su viši rashladni učinak i COP nego R134a. Prosječne vrijednosti COP za R510A i R600a bile su 22,26 i 3,06 % više od onih za R134a. Općenito, R510A i R600 pokazali su se boljima nego R134a i mogu se koristiti kao zamjenske radne tvari za R134a u postojećim kućnim hladnjacima. Najbolja svojstva dobivena su uporabom radne tvari R510A u modificiranome sustavu. KEY WORDS domestic refrigerator eco-friendly performance retrofitted R510A and R600a KLJUČNE RIJEČI kućni hladnjak ekološki prihvatljiv svojstvo modificiran R510A i R600a
“…The data collected at different evaporating temperatures and the corresponding properties of refrigerants obtained using refrigerant database software known as REFPROP [20] were used to compute the following performance parameters (Eqs. 1 to 7): refrigerating effect (Q evap ), compressor work input (W comp ), condenser heat load (Q cond ), Coefficient of Performance (COP), Volumetric Cooling Capacity (VCC) and Pressure Ratio (PR).…”
Section: Analysis Of the Heat Transfer In The Refrigeration System / mentioning
confidence: 99%
“…The Volumetric Cooling Capacity (VCC, kJ/m 3 ) is the refrigerating effect per unit volume of refrigerant at the inlet of the compressor. It is a value calculated from the vapour density at the compressor's inlet and the enthalpy difference of the evaporation [20]:…”
Section: Analysis Of the Heat Transfer In The Refrigeration System / mentioning
Halocarbon refrigerants have been scheduled for total phase out because they contributed significantly to the two major global environmental problemsozone layer depletion and global warming. In this study, the performances of the environmentally friendly R510A and R600a in a retrofitted domestic refrigerating system were investigated experimentally and compared with the performance of R134a. The results obtained showed that R510A has the lowest discharge pressure with an average value of 13,4 % lower than that of R134a. The average pressure ratios of R510A and R600a were 16,91 and 12,17 %, respectively, lower than that of R134a. The Volumetric Cooling Capacity obtained for R510A was 5,34 % higher than that of R134a. R510A and R600a exhibited higher refrigerating effect and Coefficient of Performance (COP) than R134a.The average COPs for R510A and R600a were 22,26 and 3,06 %, respectively, higher than that of R134a. Generally, R510A and R600a performed better than R134a and they can be used as retrofit substitute refrigerants for R134a in the existing domestic refrigerators. The best performance was obtained from the use of R510A in the retrofitted system. Sažetak Halougljične radne tvari planiraju se potpuno izbaciti iz uporabe jer su znatno pridonijele dvama svjetskim ekološkim problemima-razaranju ozonskoga omotača i globalnome zatopljenju. U ovoj studiji eksperimentalno su ispitivana svojstva ekološki prihvatljivih radnih tvari R510A i R600a u modificiranome kućnome hladnjaku i uspoređena su sa svojstvima R134a. Dobiveni rezultati pokazali su da R510A ima najniži kondezatorski tlak s prosječno 13,4 % nižom vrijednošću od R134a. Prosječni kompresijski omjeri za R510A i R600 bili su 16,91 i 12,17 % niži nego za R134a. Volumetrijski rashladni kapacitet dobiven s R510A bio je 5,34 % viši nego s R134a. R510A i R600a postigli su viši rashladni učinak i COP nego R134a. Prosječne vrijednosti COP za R510A i R600a bile su 22,26 i 3,06 % više od onih za R134a. Općenito, R510A i R600 pokazali su se boljima nego R134a i mogu se koristiti kao zamjenske radne tvari za R134a u postojećim kućnim hladnjacima. Najbolja svojstva dobivena su uporabom radne tvari R510A u modificiranome sustavu. KEY WORDS domestic refrigerator eco-friendly performance retrofitted R510A and R600a KLJUČNE RIJEČI kućni hladnjak ekološki prihvatljiv svojstvo modificiran R510A i R600a
“…In the literature, standard VCR cycle was mostly used while doing performance analysis of various alternative refrigerants and corresponding pressure–enthalpy (P-h) chart of the cycle is shown in Figure 3. 13,14,42–45 The basic thermodynamic processes take place in standard VCR cycle are represented in Figure 3. Figure 2.Line diagram of the VCR system.Figure 3.P–h chart of the standard VCR cycle.…”
The present investigation focuses on theoretical performance of various new environment-friendly refrigerant mixtures as substitutes to high global warming potential refrigerant R22. In this investigation, 34 refrigerants were considered at various composition. In this work, both complex vapor compression cycle (actual cycle) and standard vapor compression cycle (ideal cycle) was considered for the performance assessment of refrigerants. Vital studies such as flammability, toxicity, and environmental impact of various novel refrigerants were also carried out in this study. Results obtained from actual cycle showed that the coefficient of performance of refrigerant mixture RM40 (R1270/R134a 90/10 in mass %) (2.728) was the greatest among 34 investigated alternatives and it was closer to the coefficient of performance of R22 (2.770). Compressor discharge temperature of RM40 was 13.36 ℃ lower when compared with R22. Volumetric refrigeration capacity of RM40 (3335 kJ/m3) was slightly higher than that of R22 (3297 kJ/m3). Power spent per ton of refrigeration of RM40 (1.288 kW/TR) was marginally higher than that of R22 (1.269 kW/TR). Global warming potential (GWP100) of RM40 (133) was very low compared to the GWP100 of R22 (1760). Total equivalent warming index (environmental impact) of RM40 was 5.61% lower than R22. However, performance results obtained from standard cycle for various investigated refrigerants were better than actual cycle, since various losses occur were neglected in the standard cycle. Overall, thermodynamic performance of refrigerant mixture RM40 (R1270/R134a 90/10 in mass %) obtained from both actual and standard cycle was the highest among 34 investigated refrigerants and it was very closer to the performance of R22 and hence, it could be considered as an environment-friendly alternative to replace high GWP refrigerant R22 used in refrigeration systems.
“…Residential air conditioners work on the principle of vapour compression refrigeration system. In majority of literature, thermodynamic analysis of air conditioners was done based on either simple saturation or standard vapour compression cycle [25][26][27][28]. The P-h diagram of standard vapour compression cycle is shown in Figure 4.…”
The present study investigates the theoretical thermodynamic performance analysis and flammability study of various new ozone friendly refrigerants as replacements to R22. In this work, five non azeotropic refrigerant blends comprising of R152a, R134a, R32, R290 and R1270, at various compositions were developed. Flammability study of all the five refrigerant mixtures considered were carried out by using Refrigerant Flammability (RF) number. The cycle followed during the performance investigation of refrigerants was the actual vapour compression refrigeration cycle. Thermodynamic performance characteristics of all the five investigated refrigerants were compared with the baseline refrigerant R22. Theoretical results showed that COP of refrigerant M40 was 0.51% higher, compared to R22 and the five refrigerants studied. Compressor discharge temperature of M40 was lowered by 11.6 0 C compared to R22. Power consumed to produce per ton of refrigeration of M40 was 0.52% lower, compared to R22 and the five refrigerants considered. Heat transfer rate through the condenser for M40 was 3.66% higher than R22. Volumetric refrigeration capacity of M40 was the highest among the five studied refrigerants and it was very close to the volumetric capacity of R22. Flammability analysis revealed that all the five investigated refrigerant mixtures were classified into the weakly flammable category. Overall, the thermodynamic performance of new ternary blend M40 (R32/R134a/R1270 5/60/35 by mass percentage) was higher than R22 with reasonable saving in power consumption and hence, M40 is a viable candidate to replace R22.
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