*2.1. Description of the System*

This section presents a general description of the 2-MW natural gas engine and each ORC configuration and operation. In this study, a Jenbacher JMS 612 GS-N. L engine (Figure 1) is considered to evaluate the ORC–WHR systems. The main design and operation engine parameters are summarized in Table 1. Fuel composition and air–fuel mixture supply conditions for the studied plastic production plant are presented in Table 2. The air–fuel mixture conditions are set to obtain an optimum flammable gas–air mixture and an exhaust gas temperature of 420–460 ◦C after the turbocharger expander.

**Figure 1.** Jenbacher JMS-612 GS-N. L natural gas engine.

**Table 1.** Main design and operation parameters of Jenbacher JMS 612 GS-N. L engine.



**Table 2.** Fuel composition and supply conditions for the Jenbacher JMS 2 GS-N. L engine.
