Machine calculation

Refrigerating machines theory - Mechanical compression machines. Single-stage cycles

Figure 1 - Evans-Perkins single-stage refrigeration cycle

Figure 2 - Real single-stage refrigeration cycle

Figure 3 - Compressor cycles

Figure 4 - Influence of compression ratio on suction valve opening delay

Figure 5 - Influence of compression ratio on volumetric efficiency

Figure 6 - Effective efficiencies of reciprocating compressor units, according to &#34;Energy savings in refrigeration&#34; (IIF doc.)

Figure 7 - Effective screw compressor efficiencies at three volume reduction ratios. Comparison with a piston compressor

Figure 8 - Determining the cold source temperature from the evaporator toe-in

Figure 9 - Variation of relative humidity in a cold room as a function of temperature difference

Figure 10 - Determination of condensation temperature from water heating and condenser pinching

Figure 11 - Factors to consider when calculating the heat balance of a water-to-water heat pump

Figure 12 - Double ascending pipe

Figure 13 - Influence of hydrostatic and flow pressure drops

Figure 14 - Example of an abacus giving the effective power of a refrigeration unit

Figure 15 - Examples of graphs showing the cooling capacity and power consumption of a motor-compressor cooling unit.

Figure 16 - Single-stage refrigeration machine cycles operating between a single condensing temperature and three evaporating temperatures

Figure 17 - Single-stage refrigeration machine cycles operating between a single evaporating temperature and three condensing temperatures

Figure 18 - Increased subcooling. Schematic diagram and impact on the cycle

Figure 19 - Thermal power adjustment methods

Figure 20 - Classic graphical representation of reduced cooling capacity

Figure 22 - Same CO2 refrigeration cycles shown in the T-s entropy diagram

Figure 23 - Evolution of the COPth of CO2 as a function of pressure and inlet temperature in the regulator.