1-2: A reversible, adiabatic (isentropic) compression of the refrigerant. The direction of the cyclic process in theT-s diagram determines w hether this is a heat pump cycle (refrigeration cycle) or a work machine cycle (steam power cycle). The following schematic shows a basic refrigeration or heat pump system with typical property values. It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive. M. Bahrami ENSC 461 (S 11) Refrigeration Cycle 3 Fig. heat transfer from low to high temperature) cannot occur by itself (Claussius Definition of Second Law). Miguel Padilla et al [5] found that R413A (mixture of 88% R134a, 9%R218, 3%R600a) can replace R12 and R134a in domestic refrigerator. Refrigeration Cycle Patm= 100 kPa W AcA= 0.002 m2 R134a mA = 1.75 kg PA = 280 kPa Qc QH refrigerator water mg = 0.5 kg Tg = 45°C Problem sketch Solve with EES. R152a performed better than R134a in terms of COP, exergetic efficiency and efficiency defect as R12 substitute in domestic refrigeration system. But the reverse process (i.e. Unlike the situation with steam power plants it is common practice to begin the design and analysis of refrigeration and heat pump systems by first plotting the cycle on the P-h diagram. substitute (R134a and R 152a) in the domestic refrigerator. R134a, chemically 1,1,1,2-tetrafluoroethane (CF 3 CH 2 F) is a non-flammable gas used primarily as a “high-temperature” refrigerant for domestic refrigeration and automobile air conditioners. This cycle is often used as a comparison cycle to describe the quality of the cyclic process. The refrigeration system shown in the problem sketch transfers energy from cylinder A to cylinder B. Cylinder A contains ma = 1.75 kg of R134a, which is initially saturated vapor … 5-3: T-s and P-h diagrams for an ideal vapor-compression refrigeration cycle. Document all necessary balances. Refrigeration cycles are anti- A Basic R134a Vapor-Compression Refrigeration System. Refrigeration Cycle It is a well known fact that heat flows in the direction of decreasing temperature, i.e., from a high temperature region to a low temperature region. Carnot cycle, here the enclosed area is a rectangle.