Refrigeration simple cycle

In addition to the distinction between open- and closed-cycle systems, refrigeration processes are also described as simple cycles, compound cycles. 

Refrigerated inlet cooling is much more effective in humid areas and can add about 12.8% to the power output of the simple cycle gas turbine. The... 

Rather than use the simple cycle shown in Figure 24.44 for the liquefaction of natural gas, much more complex arrangements using multiple cycles (with both pure and mixed refrigerants) and cascade systems can be used. 

A simple cooling cycle serves to illustrate the concepts. Figure 1 shows a temperature—entropy plot for an actual refrigeration cycle. Gas at state 1 enters the compressor and its pressure and temperature are increased to state 2. There is a decrease in efficiency represented by the increase in entropy from state 1 to state 2 caused by friction, heat transfer, and other losses in the compressor. From state 2 to states 3 and 4 the gas is cooled and condensed by contact with a heat sink. Losses occur here because the refrigerant temperature must always be above the heat sink temperature for heat transfer to take... 

Flooded refrigeration systems are a version of the closed-cycle design that may reduce operating problems in some appHcations. In flooded systems, the refrigerant is circulated to heat exchangers or evaporators by a pump. Figure 11 shows the flooded cycle, which can employ any of the simple or compound closed-refrigeration cycles. 

System performance in ciyogenic liquefiers and refrigerators is directly related to the effectiveness of the heat exchangers used in the system. For example, the liqiiid yield for a simple J-T cycle as given by Eq. 11-112 needs to be modified to... 

In a simple Carnot s cycle, in which heat QA is absorbed from the source at temperature TA, and heat QB is emitted to the refrigerator at temperature TB, we have ... 

Figure 24.22 A simple (ideal) compression refrigeration cycle.

Figure 24.23a again shows a simple compression cycle involving a pure refrigerant fluid, but now with an... 

An engineer claims that the performance of a simple refrigeration cycle can be improved by using his three-stage compression process as shown in Fig. 6.42a. Refrigerant enters all compressors as a saturated vapor, and... 

Favorable energy relationships and a convenient refrigeration cycle make freezing look attractive. Movement of a crystal bed by hydraulic forces combines adequate production with a simple washing procedure. 

Draw a simple scheme for the refrigeration cycle discussed in Figure 3.3. The compressor power for the production of 494 kW ice is 1802 kW. 

FIGURE 2 (a) Schematic for simple Linde-cycle refrigerator (b) temperature-entropy diagram for cycle. 

---