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Experimental analysis of a commercial refrigeration system operating with R22 and the hydrocarbon R1270.

Number: pap. n. 302

Author(s) : BANDARRA FILHO E. P., ANTUNES A. H. P.

Summary

This work contributed to the knowledge on the study to replace halogenated fluids by natural refrigerants reducing the damage to the environment. Initially, it was important to know the operation limits of the experimental facility, with maximum refrigerating capacity of 17.5 kW. At the same time to the first goal, instrumentation and control strategies were adopted, allowing extending the focus of this research such as the energy savings. The experimental facility has been submitted at three different configurations: the first one depicted a conventional refrigeration system that, basically, consists of a reciprocating compressor working at nominal frequency, two concentric tubes heat exchanger, a thermostatic expansion valve (TEV) and R22 as work fluid; in the second case, the compressor speed was controlled by an inverter frequency drive and an electronic expansion valve (EEV) replaced the thermostatic expansion valve (TEV) and, finally, it was proposed a third system configuration, exactly the second one, in which was used R1270 (propylene) as the working fluid. The experimental results showed that the system operating at frequencies below 60 Hz and the implementation of a PID controller in the expansion device enabled the improvement in the coefficient of performance (COP) of the automated system compared to the COP of the conventional system, which used an on-off controller. Consequently, the automation of the conventional system reduced by 35% the average monthly energy consumption. The replacement of R22 by R1270 increased even more the values of the COP and reduced the environmental damage, calculated by the total equivalent warming impact (TEWI). It was showed that the automation and the replacement of a traditional fluid by a hydrocarbon decrease up to 39% the damage to the environment for this specific application. The experimental results obtained in this work for the R1270 showed good agreement in comparison with the data provided by the compressor manufacturer.

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Pages: 8 p.

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Details

  • Original title: Experimental analysis of a commercial refrigeration system operating with R22 and the hydrocarbon R1270.
  • Record ID : 30004679
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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