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Simulated performance of HC-290 in air conditioners.

Number: pap. ID: 896

Author(s) : PADALKAR A. S., MALI K. V., DEVOTTA S.

Summary

As per the accelerated phase out schedule of Montreal Protocol, HCFC-22 has to be phase out by 2020 in Article 5 countries and 2030 in non Article 5 countries. Being natural substance, HC-290 is considered as alternative to HCFC-22. In the case of HC-290, the consideration must be given to flammability. After achieving the reduction in charge of HC-290 up to 30% lower that of HCFC-22, this paper focuses on simulation studies for further reduction of HC-290 charge for air conditioners both window and split air conditioner using IMST ART v3.3. A 5.16 kW capacity window air conditioner and 4.95 kW capacity split air conditioners designed for HCFC-22 are considered. The air conditions considered are as per the Indian Standard IS 1391 (1992) Part I. First the baseline performance is established with HCFC-22 for both the air conditioners. The performance of HC-290 is predicted under drop-in condition. Under drop-in test, (replacing HCFC-22 with HC-290 without any other system changes) for both air conditioners, the cooling capacity is lower and COP is higher than that of HCFC-22. The optimized charge of HC-290 is in the range 48 to 50% that of HCFC-22 by weight. Standards like EN 378 specify the allowable charge of HC-290 in a closed space to avoid risk due to flammability. The condenser is the major component of air conditioner which contains the large amount of refrigerant. Therefore, the various combinations of low size condenser tube OD, ranging from 9.52 to 3.18 mm is considered to reduce charge with performance equivalent to HCFC-22. The lowest HC-290 charge is with 4.75 mm tube OD condenser for both window air conditioner as well as split air conditioner. For window air conditioner with 4.75 mm OD tube, the cooling capacity is 9.2% lower than that of HCFC-22 and COP is 2.9% higher than that of HCFC-22. For split air conditioner with 4.75 mm OD tube, the cooling capacity is 5.8% lower than that of HCFC-22 and COP is 7.1% higher than that of HCFC-22.

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Pages: 6 p.

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Details

  • Original title: Simulated performance of HC-290 in air conditioners.
  • Record ID : 30001751
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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