A 1.5-ft³rigid tank contains saturated refrigerant-134 at 170 psia. Initially, 20 percent of the volume is occupied by liquid and the rest by vapor. A valve at the top of the tank is now opened, and vapor is allowed to escape slowly from the tank. Heat is transferred to the refrigerant such that the pressure inside the tank remains constant. The valve is closed when the last drop of liquid in the tank is vaporized. Determine the total heat transfer for this process. R-134a, Sat. mixture P = 170 psia V = 1.5 ft³
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- A Carnot vapor refrigeration cycle operates between thermal reservoirs at 7°C and 28°C. The working fluid is saturated vapor at the end of the compression process and saturated liquid at the beginning of the expansion process. Determine the operating pressures in the condenser and evaporator, in bar, and the coefficient of performance for each of the following as the working fluid. (a) Refrigerant 134a (b) Refrigerant R22 (c) water (d) ammoniaSeveral liquids are layered inside a tank with pressur- ized air at the top. If the air pressure is 3.2 kPa, calcu- late the pressure at the bottom of the tank if the lay- ers include 20 cm of SAE 10 oil, 10 cm of water, 15 cm of glycerin, and 18 cm of carbon tetrachloride.A closed container contains 3m high of kerosene (SG = 0.85), water, and 0.7m high of an unknown liquid (SG = 2.2). The air pressure above these mixture is 20 KPa while the pressure at the bottom of the tank is 88 KPa. Determine the height of water. A 2.53 m B 2.84 m C) 2.08 m D No answer among the choices E 3.26 m
- Friction loss in pumping oil to pressurized tank an oil having a density of 833 kg/m3 and a viscosity of 3.3 x 10³ Ns/m² is pumped form an open tank to a pressurized tank held at 345 kPa (gage). The oil is pumped from an inlet at the side of the open tank through a line of commercial steel pipe 3-inch nominal pipe size r of internal diameter 77.92 mm at the rate of 3.494 x 10³ m³/s. The length of straight pipe is 122m and the pipe contains two elbows (90") and a globe valve half open. The level of the liquid in the open tank is 20 m above the liquid level in the pressurized tank. The pump efficiency is 65%. Calculate the kW power of the pump (1.40 HP) elbow Globe valve 20 m PUMPA 10 cm diameter solid cylinder of height 10 cm weighing 0.40 kg is immersed in a liquid (800 kg/cm^3) contained in a tall metal cylinder having a diameter of 13 cm. Before immersion, the liquid was 8 cm deep. At what level from the bottom will the solid cylinder float? W, = 0.40kg %3D 10cme tank New L.S. Original L.S F,3 A tank contains 100 gal of brine in which 50 lb of salt is dissolved. Brine containing 2 lb/gal of salt runs into the tank at the rate of 3 gal/min; and the mixture, assumed to be kept uniform by stirring, runs out at the rate of 2 gal/min. Assuming that the tank is sufficiently large to avoid overflow, find the amount of salt in the tank as a function of the time t. When will the con- centration of salt in the tank reach Ib/gal? How much salt is in the tank at the end of 30 min? Work Exercise 3 with the rates of influx and efflux interchanged, and find the amount of salt in the tank after 1 h instead of at the end of 30 min. Under these circumstances, when will the 4 tank contain the maximum amount of salt, and what is this amount?
- The saturated liquid of water at T=300C has total volume (v) of 0.05m3,quality(x) of 75%,vf=1.4036×10-3m3/kg,vg=0.02167m3/kg A.find the specific volume v in m/kg of two phase mixture B.find the mass (m) of water in kg C.find the mass(mg) of the satured vapor in kg D.find the mass(mf) of the satured liquid in kgSOLUTION MUST BE HANDWRITTEN a.) Determine the pressure at the interface of carbon tetrachloride and syrup b.) Determine the difference in pressure between the interface of water and syrup and the interface of carbon tetrachloride and syrup c.) Compute the hydrostatic pressure (in psf) acting at the bottom of the tank d.) Apply the PANEL EQUATIONS to determine the magnitude, direction, and location of the total hydrostatic force acting at the bottom of the tankA tank contains three liquids. Oil with sp.gr of 0.80, gasoline with sp.gr of 0.90 and sea water with a sp.gr of 1.05 with depths of 0.65m, 0.45m and 0.55m respectively. Compute for the water pressure at a depth of 0.80m.
- A pipeline with a pump carrying a 50 L/s discharge leads to a nozzle as shown. If the 180 mm diameter pipe is made of cast iron while the 120 mm diameter pipe is made of commercial steel. Determine the head of the pump using the energy equation from pt. A to pt. C. The fluid is water with a kinematic viscosity of 1.02 x 10-6 m³/s. El. 20 m Water B 180-mm dia. pipe 200-m long pipe 300-m long pipe 120-mm dia. pipe El. 10 m El. 30 mAn absorption column is to be designed to recover 99.5% of the NH3 from a feed stream, which is supplied at 72 oF and an NH3 partial pressure of 10 mm Hg.A tank contains 80 lb of salt dissolved in 500 gal of water. The inflow per minute is 20 lb of salt dissolved in 20 gal of water. The outflow is 20 gal/min of the uniform mixture. Inflow 20 gal/min. Q 80 lb Outflow V-500 gal. - 20 gal/min The time when the salt in the tank reaches 300 lb is: O a. (1000 - 1100) Sec. O b. (20 - 23) Min. O c. (1/4 - 1/3) Hrs. d. None of the above