Conclusion

Automatic Operation of Refrigeration Equipment

Figure 1 - Saturated vapour pressure thermostat with dry contacts

Figure 2 - Variation in saturation vapour pressure as a function of temperature. The case of methyl chloride

Figure 3 - Saturation vapour pressure as a function of temperature

Figure 4 - Thermostatic expansion valve with internal balancing

Figure 5 - Thermostatic expansion valve with external balancing

Figure 6 - Evolution of MOP thermostatic train pressure and &#34;standard&#34; thermostatic pressure

Figure 7 - Cross-sections of distributors feeding two slicks

Figure 8 - Three-phase expansion in the case of an expansion valve combined with a distributor

Figure 9 - Simplified diagram of flooded system and associated Mollier diagram

Figure 10 - Simplified diagram of recirculating flooded system and associated Mollier diagram

Figure 11 - Low-pressure float valve

Figure 12 - Oil rectifier

Figure 13 - Refrigeration cycle of a plant with or without oil rectifier

Figure 14 - Constant-pressure valve

Figure 15 - Pressostatic water valve

Figure 16 - Pressostatic damper

Figure 17 - Condensing pressure regulator

Figure 18 - Installation of a condensation pressure regulator

Figure 19 - Principle diagram of optimum floating HP control

Figure 20 - Compressor operating limits for example

Figure 21 - All-to-all cooling capacity on three identical compressors with variable speed control

Figure 22 - Power controller

Figure 23 - Oil differential pressure switch

Figure 24 - Flow sensor diagram

Figure 25 - Observation of oil/refrigerant foaming (measurements carried out at Lafset, Cnam)

Figure 26 - Large-section check valve

Figure 27 - Liquid traps

Figure 28 - Liquid-steam heat exchanger

Figure 29 - Schematic diagram of a discharge temperature maintenance system using steam injection at suction.

Figure 30 - Schematic diagram of hot gas defrosting for the defrosting period

Figure 31 - Simplified diagram of defrosting by cycle inversion, 4-way valve

Figure 32 - 4-way valve operation

Figure 33 - Oil separator with automatic return

Figure 34 - Schematic example of a PLC