Problem 7 Liquid water at 200 kPa and 25°C is heated in a chamber by mixing it with superheated steam at 200 kPa and 250°C. cold water enters the chamber at a rate of 2 kg/s. If the mixture leaves the mixing chamber at 50°C, determine the mass flow rate of the superheated steam required.
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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) ammoniaA 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 ft³problem 5.3 Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 5000 kPa, the reheat section at 1200 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 96 percent. Determine the temperature at the inlet of each turbine and the cycle's thermal efficiency. Answers: 327°C, 481°C, 35.0 percent High-P turbine Low-P turbine Reheater Boiler Condenser 2 Pump
- Argon gas flows through a well-insulated nozzle at steady state. The temperature and velocity at the inlet are 570°R and 150 ft/s, respectively. At the exit, the temperature is 460°R and the pressure is 40 lb/in². The area of the exit is 0.0085 ft². Use the ideal gas model with k = 1.67, and neglect potential energy effects. Determine the velocity at the exit, in ft/s, and the mass flow rate, in lb/s.A turbine discharges 200 kg/h of saturated steam at 10.0 bar absolute. It is desired to generate steam at 250°C and 10.0 bar by mixing the turbine discharge with a second stream of superheated steam of 300°C and 10.0 bar.(a) If 300 kg/h of the product steam is to be generated, how much heat must be added to the mixer?(b) If instead the mixing is carried out adiabatically, at what rate is the product steam generated?Several 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.
- 2-64 Nitrogen enters a steady-flow heat exchanger at 150 kPa, 10°C, and 100 m/s, and it receives heat in the amount of 120 kJ/kg as it flows through it. Nitrogen leaves the heat exchanger at 100 kPa with a velocity of 200 m/s. Determine the Mach number of the nitrogen at the inlet and the exit of the heat exchanger.Air with a mass flow rate of 5 kg/s enters a horizontal nozzle operating at steady state at 450 K, 350 kPa, and velocity of 3 m/s. The nozzle is well insulated. At the exit, pressure is 300 kPa and temperature is 390 K. Using the ideal gas model for air, the area at the inlet is m², and the velocity at the outlet is Are potential effects negligible? Why? m/s. Is heat transfer negligible? Why? Note that you may choose to model the specific heat as constant.a constant pressure container (inside the piston-cylinder) with 250 kPa pressureat the beginning the mass of the saturated water vapor was 8 kg. Then the saturated steam in the cylinder compressed to 3/4 of its mass vy cooling.1) what's the amount of heat transferred to the environment.
- In the tank of 100 liters of brine containing 50kg totally dissolved salt. Pure water is allowed to run into the tank at the rate of 3 liters per minute. Brine runs out of the tank at rate of 2 liters minute. The instantaneous concentration in the tank is kept uniform by stirring. How much salt is in the tank at the end of 1.7 hour?A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures Tc and TH, respectively. (a) If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F. (b) If Tc = -15°C and T₁ = 30°C, determine the coefficient of performance. (c) If Qc = 500 Btu, QH = 1000 Btu, and Tc = 20°F, determine TH, in °F. (d) If Tc = 30°F and TH = 100°F, determine the coefficient of performance. (e) If the coefficient of performance is 5.5 and Tc = -5°C, find Tâ, in °C. Part A If the coefficient of performance is 10 and Tc = -40°F, determine TH, in °F. TH= i °F1) A cylinder of volume 50cm made of Pyrex glass is full to the brim with acetone. Suppose the cylinder and acetone are warmed by 30°C. (Coefficient of linear expansion of glass, 3.2 x 10-6K-1 and acetone, 5.0 x 10-5K-1) i. Calculate the change in volume of the glass. ii. Calculate the change in volume of the acetone. ii. Will any acetone spill out of the cylinder? Explain.