Determine whether refrigerant R-410a in each of the following
states is a subcooled liquid, a
superheated vapor, or a mixture of saturated liquid and
vapor.
a) 45 ˚C, 0.008 m3/kg
b) 0.9 MPa, 5 ˚C
c) 101 kPa, 0.2 m3/kg
d) –20 ˚C, 0.4 MPa
Determine whether refrigerant R-410a in each of the following states is a subcooled liquid, a superheated...
3) A vapor-compression refrigerator uses refrigerant-134a. Superheated vapor enters the compressor at 100 kPa and -20° C, and exits at 1 MPa and 60° C. The refrigerant is cooled to 35° C in the condenser and then expands back to 100 kPa through an expansion valve. Neglect pressure losses within the condenser and evaporator. The refrigerant flow rate is 0.10 kg/s. Calculate the following a) the rate of heat removal from the cooled space, in kw, b) the rate of...
A vessel with a volume of 0.008 m3 contains a liquid-vapor mixture of refrigerant 134a at 200 kPa and a quality of 20%. Determine: a) the mass of vapor present in kg, and b) the fraction of the total volume occupied by the liquid.
please explain Determine the quality (if saturated) or temperature (if superheated) of the following substances at the given two states: 2: 10 MPa, 0.01 m'/kg 2: 100 K, 0.03 m'/kg 1: 120°C, 1 m'/kg; MPa, 0.03 m'/kg; c. Ammonia at : 400 kPa, 0.327 m'/kg; 2: 1000 kPa, 0.1 m/kg 1: 130 kPa, 0.1 m'/kg; a. Water at b. Nitrogen 2: 150 kPa, 0.17 m'/kg d. R-22 at Determine the quality (if saturated) or temperature (if superheated) of the following...
2. Do Problem 3.68E below. 3.68E Determine whether water at each of the following states is a compressed liquid, a superheated vapor, or a mixture of saturated liquid and vapor. a. 1800 lbf/in.2, 0.03 ft/lbm d. 2 lbf/in.2, 50 F b. 150 lbf/in.?, 320 F e. 270 F, 30 lbf/in.2 c. 380 F, 3 ft/lbm f. 160 F, 10 ft/ibm
A liquid-vapor mixture of refrigerant-134a is at -10°C with a quality of 40 percent. Determine the value of the Gibbs function, in kJ/kg. when the two phases are in equilibrium. R-134a -10°C 0.4 kJ/kg kJ/kg
Homework 2 Problem 1: A piston-cylinder device initially contains 0.35-kg steam at 3.5 MPa, superheated by 7.4 C. Now the stream loses heat to the surroundings and the piston moves down, hitting a set of stops at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at 200C. Determine (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits...
A 0.6 m3 rigid tank initially contains refrigerant-134a in saturated vapor form at 0.9 MPa . As a result of heat transfer from the refrigerant, the pressure drops to 240 kPa. Use TESTCalc to answer the following questions. a) Determine the final temperature (T2). b) Determine the amount of refrigerant that condenses. c) Determine the heat transfer (Q).
An insulated piston-cylinder device contains 0.05 m3 of saturated R-134a vapor at 0.8 MPa. The refrigerant is now allowed to expand in a reversible manner (i.e. isentropic) until the pressure drops to 0.4 MPa. Determine (a) the final temperature in the cylinder and (b) the work done by the refrigerant.
A two-stage compression refrigeration system with an adiabatic liquid-vapor separation unit uses refrigerant-134a as working fluid. The system operates the evaporator at 0.4 MPa, the condenser at 1.6 MPa, and the separator at 0.8 MPa. The compressors use 25 kW of power. Given that the refrigerant is saturated liquid at the inlet of each expansion valve and saturated vapor at the inlet of each compressor, and the compressors are isentropic: (0) show the process on a T-s diagram; ) calculate...
R-134a enters an adiabatic throttle as a compressed liquid at 18°C. If the refrigerant leaves the throttle at 70 kPa, determine the quality, in percent of the exit stream. Give your answer to 3 significant figures. Throttling valve R-134a Saturated Mixture Compressed Liquid