Alternatives to HCFCs in the Refrigeration and Air Conditioning Sector 50 S ection 02 The measurements before the retrofit showed acceptable operation so the retrofit was carried out. The conclusion of the retrofit and performance analysis was that the unit behaved with similar performance after the retrofit. The differences documented were a slightly lower COP (3%) and a capacity (9%) below that of R-22. But a closer look also show that the incoming air (SecC Evap in) temperature is one degree lower than before the retrofit which affect the evaporation and thus the performance as well as a two degree higher superheat. There are Fig. 2.3 Documentation of performance prior to retrofit to ensure that system may be retrofitted Fig. 2.4 Documentation of performance after retrofit shows slight differences in capacity and COP largely explained by slight differences in operating conditions. By optimisation of superheat control the system could be further enhancedpossibilities to optimise the operation further by adjusting the superheat control for the new refrigerant to achieve the same performance in this particular system. Another conclusion is that documentation of performance offers a potential to improve energy efficiency and reliability of systems in connection with retrofits. With this type of flushing unit the R-22 is recycled and can be available for re-use. The oil is degassed and should be dealt with according to regulations for waste oil in the country. Fig. 2.5 A performance analyser device was used to ensure that the system was in good working order before retrofit and was correctly functioning after the work had been completed.