Category: Vapour Compression and Vapour Absorption Systems

The suction or evaporator pressure decreases due to the frictional resistance to the flow of refrigerant. Let the suction pressure ps decrease to ps′ as shown in p-h diagram of Fig. 19.16. The effect of decrease in suction pressure are: Therefore, the COP decreases for the same amount of refrigerant flow. Hence, the refrigerating capacity of the system decreases and the refrigeration…

The T-s (Temperature-entropy) diagram for the vapour compression cycle is shown in Fig. 19.5. Figure 19.5 T-s diagram for vapour compression cycle Figure 19.6 p-h diagram for vapour compression cycle Figure 19.7 Pressure-enthalpy (p-h) chart Process 1-2: Isentropic compression. State 1 represents saturated vapour and state 2 is super heated vapour. Process 2-3: Condensation. State 2 represents saturated vapour and state 3 is…

A schematic diagram of a vapour compression refrigeration system is shown in Fig. 19.2. It consists of a compressor, condenser, expansion device for throttling and an evaporator. In plants with a large amount of refrigerant charge, a receiver and a drier is installed in the liquid line. The p-v, T-s, and p-h diagrams for the system are shown in Fig. 19.3. The…

The schematic diagram of a simple vapour compression refrigeration system is shown in Fig. 19.1. It consists of the following parts: Figure 19.1 Schematic diagram of simple vapour compression refrigeration system

Following are the advantages and disadvantages of the vapour compression refrigeration system over air refrigeration system: Advantages Disadvantages

The vapour compression refrigeration system is based upon the fact that fluids absorb heat while changing from a liquid phase to vapour phase and reject heat while changing from a vapour phase to a liquid phase. The temperature during the phase change remains constant. However, the temperature varies with the pressure and the fluid. In…