**7.2 Multistage**

This type of system has higher volumetric efficiency, which results in increased compressor capacity compared to single-state compression. The cooling effect in a multistage system (MS) is obtainable by using two or more refrigerating spaces at various temperatures. The MS is represented in **Figure 7**. There is a limitation on the lowest temperature that can be attained using this method due to the usual

*Impact of Working Fluids and Performance of Isobutane in the Refrigeration System DOI: http://dx.doi.org/10.5772/intechopen.99121*

**Figure 7.** *Systematic diagram of the multistate system.*

boiling point of the refrigerant. Thus, this system is not appropriate for the production of cryogenic temperature [70].
