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A Carnot refrigerator removes 16 000 kJ/min from a cold storage room at - 20C. Heat is discharged to the atmosphere at 20C. Determine the power required.
Determine (a) The mass flow rate ratio of air to steam, (b) The required rate of heat input in the combustion chamber, and (c) The thermal efficiency of the combined cycle.
Determine for the cycle (a) The rate of heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam flowing (b) The thermal efficiency.
Saturated liquid exits the condenser at 6 kPa and the isentropic pump efficiency is 82%. (a) For T=580 degrees celcius, determine the turbine exit quality and the cylce thermal efficiency.
The readings of the testing machine indicates that the bar broke under an applied force of 2122 N. What is the flexural strength, in MPa, of the alumina bar?
Find the maximum altitude attained by the rocket. Ignore air friction. A force balance on the rocket yields the ordinary differential equation m(t)dVdt- b vd = -m(t)g , m(t) = m0 - b*t.
Calculate a) the fraction of the flow entering the separator that must be bled off b) the refrigeration capacity (assuming a condenser flow rate of 1 kg/sec) c) the coefficient of performance of the
If the air pressure and temperature at the start of the compression strike are 90 kPa and 25 degC find: the temperatures and pressures at each phase of the cycle; its thermal efficiency; and its net
Are the magnitudes of the steam flow rates through the high and low pressure turbines chosen with the turbine sizes/costs in mind, as in regenerative cycles?
If the condenser pressure is 50 kPa and the net power output is to be 60 MWatts, at what boiler pressure must the cycle operate?
Calculate the thermal efficiency of the cycle (a) if processes in turbine and compressor are ideal and (b) if the isentropic efficiencies of the turbine and compressor are 0.75 and 0.65, respectivel
Calculate (a) the compression ratio, (b) the cut-off ratio, (c) the heat input per cycle, (d) the heat rejected per cycle, (e) the net work output per cycle and (f) the thermal efficiency of the cyc
Also calculate the thermal efficiency and mean effective pressure for this cycle. Use constant specific heats at room temperature.
Assume that convective heat transfer coefficient between the dew and the air to be h=35 W/m^2-K, estimate the air temperature at which ice will begin to form (neglect heat loss/gain into the ground)
Assuming the cylinder is rest on a table and free to move, determine the stress and final dimensions (i.e. length, outside diameter, inside diameter) of the cylinder. Length 20 cm, alpha = 0.0000117
Determine the rate of heat addition and rejection when this cycle produces 110 hp and the cycle is repeated 1580 times per minute. Use constant sp. heats at room temperature.
Determine the net power output, in MW, if the fuel mass flow rate is 1200 kg/h. Kinetic and potential energy effects are negligible.
Determine the temperature of the combustion products, in K for complete combustion. (a) the theoretical amount of air. (b) 300% of theoretical air.
Due to the forces shown, the tip of the wing, point E, deflects upward by 8cm. Assuming the wing is rigid determine the stiffness kt of the torsional spring. Reort your answer using degrees.
Determine: 1. The rate of heat removal from the refrigerated space and the power input to the compressor. 2. The rate of heat rejection to the environment.
The thickness of some of the chips produced in this process is measured to be 0.22mm. Show all work to find the forces in Merchants circle?
A kitchen freezer uses 500 W of power to hold the freezer temperature to -10F. With R-134a as the refrigerant, it rejects high temperature thermal energy to the kitchen at 100 F.
Consider an ideal steam reheat cycle in which the steam enters the high-pressure turbine at 600 psia, 700 F, and then expands to 120 psia.
A condensing turbine is used, but the quality should not be lower than 90% at any state in the turbine. Find the specific work in all components.