Claude system refrigerator

In order to calculate the refrigeration work requirements of oxygen plants, it is necessary to focus attention on specific refrigeration cycles. Two Claude type cycles are used in this report. One is a low pressure cycle in which all of the process air is used to produce the refrigeration. The expander exhaust is at 6 atm. Such a system involves about the lowest pressure that would be used in any air plant refrigeration system. This cycle is shown in Figs. 1 and 2. 

Example 4.12. Many of the large hydrogen liquefaction plants use a precooled Claude cycle with one expander similar to that shown in Fig. 4.13. This system could also be used as a refrigerator to cool helium gas. For the operating conditions shown below, determine the following ... 

Determine the refrigeration effect, the coefficient of performance, and the figure of merit for a Claude refrigeration system if gaseous nitrogen is compressed isothermally from... 

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