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Calculate COP value of the reversible refrigeration system and determine the new size of the compressor, in W, that will be suitable for the reversible refrigeration system of this water cooler.
Determine the nozzle diameter for the second case, assuming that all friction losses occur outside the nozzle and neglect the small difference in elevation between the nozzle inlet and exit.
An hydraulic turbine operates under an available head of 85 m at a flow rate of 0.25 m^3/s. The electrical power output is 162.5 kW. Calculate the overall efficiency of the turbine generator.
Determine (a) the amount of energy dissipated in friction by the pulley, (b) the tension in each portion of the cord during the motion.
Determine the quality (%) of a saturated liquid vapor mixture given the data below. mvapor = 9 kg, mliquid = 11 kg Determine the mass of the liquid in a saturated liquid vapor mixture.
The water level in the second tank is 160 ft above the level of the first tank and the discharge end of the pipe is submerged. If 40 hp is delivered to the pump unit, determine the efficiency of th
The drain from the closed heater is trapped to the open heater. The extracted steam exiting the closed heater is saturated liquid Also sketch the cycle on a T-s state diagram.
Consider a cylindrical nickel wire 1.9 mm in diameter and 3.2 × 104 mm long. Calculate its elongation when a load of 280 N is applied.
Given that the elastic modulus and Poisson's ratio of the metal are 64.0 GPa and 0.32, respectively, determine the following: (a) The amount by which this specimen will elongate in the direction of
Calculate the work done during the process. Determine the mass of steam that has entered. Calculate the amount of heat transfer.
The flash chamber operates adiabatically and kinetic and potential energy effects can be ignored. Determine the mass flow rates of the exiting streams, each in kg/s.
Determine the reading on the pressure gage in psig when all the liquid has just turned to vapor (all saturated vapor). Show this process on a sketch of a T-v diagram.
Determine the exit Mach number (Me), exit velocity magnitude (Ve), exit static pressure (pe), and the mass flow rate (using the SI system). The inlet stagnation conditions are: 1. Tt1=500 K and pt1=
Calculate the following fluid and flow parameters using the EES unit system: 1. Static density, velocity, and mass flow rate at the inlet plane; 2. Static temperature & density, Mach number, vel
Determine the change in internal energy (kJ) and enthalpy (kJ) of water. (a) Using compressed liquid tables (b) Using approximation for compressed liquid state Answers: (a) U = 1.76 kJ , H = 6.78
Enough heat is added until the tank contains only saturated vapor. Determine the final pressure (bar) and the amount of heat added to the fluid, in kJ.
What is the concentration in kilograms of silicon per cubic meter of alloy? Assume that the densities for iron and silicon are, respectively, 7.87 and 2.33 g/cm3.
Two kg of saturated liquid water at 1 bar is compressed to 25 bar and 100°C in a water pump. Determine the change in internal energy (kJ) and enthalpy (kJ) of water. (a) Using compressed liquid
Determine a) max flowrate of water, b) the pressure difference across the pump. Assume the elevation difference between the pump inlet and the outlet and the effect of kinn factors to be negligible.
If the satellite is made of material with an average thermal conductivity of 5W/m K and the midpoint temperature is 0 C determine the heat generation rate and the surface temperature of the satellit
For the same number of air-conditioning units and the same desired temperature, how many people should be invited to the room for a party featuring a few hours of dancing?
The emissivity of the surface is 0.8, determine the total rate of heat transfer from the ball. At what temperature must the ball be maintained so that the heat transfer by radiation is 55% of the to
Determine at 10 m above the lake the change in each component (i.e. kinetic energy, etc) of the mechanical energy with respect to their values at the outlet of the pump.
Determine a) the overall turbine-generator efficiency, b) the mechanical efficiency of the turbine, and c) the shaft power supplied by the turbine to the generator.
Convert the equation from part a) so that the mass of oil (in kg) is given as a function of the measured pressure (in mmHg). Using these equations, determine the height of oil and mass of oil when t