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Find the heat transfer and work per unit mass of air in KJ/kg for each process of the two cycles, and compare the thermal efficiency of each. Assume constant specific heats at room temperature, and
Determine the (a) temperature of air before it enters the heating section, (b) the amount of heat removed in the heating section (kJ/kg dry air), and (c) the amount of heat transferred in the heatin
Consider outdoor ambient air at 35°C, 100 kPa, 30% relative humidity. What is maximum amount of cooling (outgoing temperature in °C) that can be achieved with this approach?
Determine the (a) isentropic efficiency of the compressor; (b) the rate of heat supplied to the heated room; and (c) the COP of the heat pump.
If steam is available at 400C and 10 bar, and condenses to a saturated liquid at 10 bar, how much steam (kg/hr) is needed to vaporize the acetone?
The cycle discharges energy by heat transfer to the surroundings at 25°C. Find the minimum theoretical power input required by the refrigeration cycle, in kW.
The cycle develops 50 kW of power while depositing 1200 kJ/min of energy by heat to the cold reservoir. Determine the temperature of the hot reservoir and the thermal efficiency of the cycle.
A wheel can be modeled as a thin ring having mass 10 kg and four spokes made of slender rods each of mass 2 kg. What is the moment required to stop the wheel 50 m downhill from its location at t = 0?
Steam at 1 MPa, 625.4 Celcius, expands in an insulated piston cylinder assembly to 0.01 MPa. Determine the maximum work (kJ) done during the process if the initial volume is 0.125 m^3
Find work required by the compressor, isentropic efficienty of the compressor, work output of the turbine, net work produced by the system, and the device's thermal efficiency.
Consider a large commercial airplane cruising at a speed of 1050km/h in air at an altitude of 10km where the standard air temperature is -50C. Determine if the speed of this airplane is supersonic
Determine the depth h of the mercury inside the box. If the box is shaken, the waves appear. If the wavelength id the waves is L/3, determine the speed of the waves.
Sketch the velocity field (and, thus, trajectories of the fluid elements) when only one source is on, and then when two sources (with the same strength) are on.
Determine the work and heat transfer per unit of mass passing through the device in kJ/kg, if the air undergoes a polytropic process with n=1.3.
The temperature of the steam entering the turbine is 700 F. Calculate the thermal efficiency of the cycle assuming isentropic expansion in the turbine.
Provide an example for how microstructure influences properties for metals, ceramics and glass, and polymers. What is a phase diagram and why is it important?
What are the sound pressure levels at a distance of 300, 500, and 1000 m for 2, 5, and 10 of these turbines located close together? Assume an absorption coefficient of 0.005.
What is the pressure that the pump can deliver? The viscosity of the oil is v = 0.00001 m2/s. Is the flow in the pipe laminar or turbulent?
A torque T is applied to a thin-walled tube of a cross section in the form of a regular hexagon of a constant wall thickness t and the mean side length a.
A square box section with 50-mm sides and 2.5-mm wall thickness. Compare the torsional rigidities and the maximum shearing stresses for the same applied torque.
Heat input of 6.63 kJ occurs in every cycle. Consider variable specific heats for air. Calculate the maximum pressure (kP) and maximum temperature in the cycle.
Plot thrust vs. time. What is the velocity of the rocket at 15, 20 and 30 seconds? Find the maximum altitude attained by the rocket. Ignore air friction.
Determine the rate of entropy production (kW/K) within the compressor if the air is modeled as an ideal gas with variable specific heats.
The gear is to transmit 90 HP at 300 RPM. What does the inside diameter of the gear need to be if the entire torque is to be carried by the press fit?
Find power required by the compressor, isothermal efficency, heat removed from the refigerated space, and the coefficient of performance.