Problem 2 Refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.16 MPa, and leaves as superheated vapor at 0.9 MPa and 70°C at a rate of 0.08 kg/s. Determine the rates of energy transfers by mass into and out of the compressor. Assume the kinetic and potential energies are negligible.

A heat engine with 0.305 mol of a monatomic gas undergoes the cyclic procedure shown in the pV diagram, where P1 = 420 kPa, p2 = 600 kPa, V₁ = 1.30 × 103 cm³, and V3 = 2.22 × 103 cm³. Between Stage 3 and Stage 1, the gas is at a constant temperature, and between Stage 2 and Stage 3, no heat is transferred in or out. The temperature of the gas at Stage 2 is 320 K.

Refrigerant-134a is throttled from the saturated liquid state at 850 kPa to a pressure of 200 kPa. Determine the temperature drop during this process and the final specific volume of the refrigerant. P₁ = 850 kPa Sat. liquid 규 R-134a P₂ = 200 kPa

3. Carbon dioxide enters an adiabatic compressor at 100 kPa and 300 K at a rate of 0.5 kg/s and leaves at 600 kPa and 450 K. Neglecting kinetic energy changes, determine (a) the volume flow rate of the carbon dioxide at the compressor inlet and (b) the power input to the compressor.

A piston compresses an ideal gas originally at P1, V₁ in an isothermal polytropic process (n=1) to one quarter its original volume. (a) Draw the CM and write the first law for this process. (b) Find the work, heat transfer, and internal energy change.

Small droplets of carbon tetrachloride at 68 °F are formed with a spray nozzle. If the average diameter of the droplets is 280 µm what is the difference in pressure between the inside and outside of the droplets? Pa

A vapor compression refrigeration cycle uses steam as the working fluid. Steamflows steadily with a mass ow rate of 0.5 kg/s. Saturated vapor at 2.0 o C (State 1) enters an uninsulated compressor and it is compressed to 0.35 bar (State 2). Heat transfer at the rate of 105 kJ/s occurs from the compressor to its surroundings and the heat transfer exactly balances the entropy generation rate so that s2 = s1. The boundary and surrounding temperature of the compressor is measured to be 26.67 o C. Steam exits as saturated liquid at 0.34 bar (State 3) from the condenser. Steam leaving the condenser is then throttled in an expansion valve (State 4) before entering a constant pressure evaporator to complete the thermodynamic cycle. (a) Calculate the power (kJ/s) for the compressor. (b) Determine the isentropic efficiency (%) of the compressor. (c) Calculate the entropy generation for the compressor. (d) Find the coefficient of performance of the refrigeration cycle. (e) Show the cycle on T-s…

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Small droplets of carbon tetrachloride at 68 °F are formed with a spray nozzle. If the average diameter of the droplets is 300 μm what is the difference in pressure between the inside and outside of the droplets? Pa

A Cylindrical Can open at one end is 20 cm in diameter and 40 cm long. The can welghs 6 N. The can is carefully put in a large tank of water vertically, with 20 cm its open end down so that the air is trapped in It (as shown in given figure). If the air in it can be assumed to undergo 40 cm isothermal compression, calculate the elevations of the water surface inside the Can and the top of the Can relative to the water surface in the tank. The atmospheric pressure is 100 kPa and the temperature is 20°C. (Take : = 9810 N/m³]