*3.1. Main Circuit of the Stirling Engine (Working Fluid—Helium)*

The main circuit of the Stirling engine is the most complex, having the following main blocks of equipment:


Figure 7 shows the main circuit of the Stirling engine (working fluid—Helium)

**Figure 7.** Main circuit of the Stirling engine. Working fluid—Helium. BT1–BT10: temperature sensors; BP1 and BP2: pressure switches; BR1: rotation sensor and generator speed sensor; BP3 and BP4: pressure transmitters.
