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indicates that the capacity and COP are about 5% and 3% lower, respectively, relative to HCFC- 22 (UNEP, 2015). Tests on a split air conditioner (with modified capillary tube and evaporator circuitry to account for the temperature glide) achieved identical capacity and COP as HCFC-22 at both 46°C and 52°C ambient (Sethi et al, 2014). The discharge temperature is also the same as with HCFC-22. R-447B Zou et al. (2016) reported on measurements of R-447B against R-410A in reversible systems across a range of conditions. For “normal” outside temperatures, capacity with R-447B was reduced by about 2-5%, but gave improvements in COP of 4-6% in cooling mode, whereas in heating mode capacity was about 7% below R-410A and COP about 2% higher. At “high ambient” conditions cooling capacity was about the same as R-410A although COP increased by up to 10%. Shen et al (2017) carried out measurements with various refrigerants to characterise the performance of a rooftop system with R-447B relative to R-410A. Under “normal” conditions, COP and capacity were 3% higher and 4% lower than R-410A, respectively, whilst at high ambient conditions COP reached 8% above R-410A with capacity equaling that of R-410A. Alabdulkarem et al. (2015) conducted a series of measurements to determine the seasonal performance of a reversible AC-HP system. R-452B In VRF systems, R-452B was found to have about 2% higher cooling capacity (expressed in terms of compressor speed) and 8% higher cooling COP, compared to R-410A and in heating mode, capacity was reduced by 3% with COP increased by 2%. Taking partial loads into account, it was determined to give an APF of 2% above R-410A (Naito et al., 2016). Hughes (2016) also compared R-452B with R-410A in VRF type systems, for which measurements showed both cooling capacity and COP to be within ±2% across a range of standard conditions. Zou et al (2016) reported on measurements of R-452B against R-410A in reversible systems across a range of conditions. For “normal” outside temperatures, R-452B typically showed a capacity reduced by around 1-3% and increase in COP of 2-5% for both cooling and heating. At “high ambient”, there was improvement in both capacity and COP of 3% and 5%, respectively. Pham and Monnier (2016) presented compressor calorimeter results comparing R-410A and R-452B. Across the range, R-452B gave 4-6% lower cooling capacity and COP from -1% and +1% relative to R-410A. Shen et al (2017) compared performance of a rooftop system with R-452B relative to R-410A. For both “normal” and “high ambient” conditions, R-452B COP was about 3- 4% higher and capacities were about equal. Wang and Amrane (2016) present results from a number of reports. Two “soft optimised” units were tested with R-452B, where one had reduced capacity by 7% and COP by 4%, whilst another achieved the same capacity as R-410A but with 5% better COP. At high ambient test conditions, both units exhibited identical capacity as R- 410A but with 4-5% better COP. Abdelaziz et al (2015) reported on a series of charge-optimised split air conditioners under “normal” and high ambient conditions. Compared to R-410A, R-452B gave 2 to 3% improvement in COP and a reduction of 3 to 4% capacity under “normal” conditions and 3% higher COP and equal capacity at hot and extreme temperature conditions. R-454A Shen et al. (2017) carried out measurements with various refrigerants to characterise the performance of a rooftop system with R-454A relative to HCFC-22. For both “normal” and “high ambient” conditions, COP and capacity were both around 15% below and about equal to HCFC- 22, respectively. Abdelaziz et al. (2015) report on a comprehensive series of measurements on 144 2018 TOC Refrigeration, A/C and Heat Pumps Assessment ReportPDF Image | Heat Pumps Technical Options
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