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A heat pump is absorbing heat from the cold outdoors at 5oC and supplying heat to a house at 25oC at a rate of 18,000 kJ/h. If the power consumed by the heat pump is 1.9 kW, the COP of the heat pum
The heat exchanger is not insulated and is losing heat at a rate of 25 kJ/s. If the exit temperature of hot air is 20oC, the exit temperature of cold water is (oC)?
A bar of rectangular cross section 20mm × 5mm with a central hole of diameter 4mm is subjected to a tensile force F which fluctuates between maximum and minimum values of 10 kN and 8 kN respec
After 10 lb/hr of the oil is removed from the potato chips in the separation unit, what is the mass fraction of oil on the potato chips (which continue on to the seasoning step)?
Explain Viscous Damping with a sketch. Provide a model that may be used in studying vibrations. Given M = 2, B = 8 and K = 6 determine the necessary parameters.
Determine (a) the pressure, volume and temperature at the state points of the cycle (b) the thermal efficiency of the cycle (c) the work done per cycle. Solution for b) 48% Solution for c) 44.4 kJ.
A refrigerator should remove 500 kJ from some food. Assume the refrigerator works in a Carnot cycle between -10 degrees C and 45 degrees C with a motor compressor of 500 W. How much time does it ta
A large stationary diesel engine produces 15 MW with a thermal efficiency of 40%. The exhaust gas which we assume is air, flows out at 800K, and the intake is 290K. How large is the mass flow rat?
Using the isothermal transformation diagram for a 1.13wt% C steel alloy (found in Callister), determine the final microstructure (in terms of just the microconstituents present).
The static pressure at the pump inlet must not be lower than -6m of water gage. Determine the diameter of the standard commercial steel pipe that will give the required performance.
The 20-mm-diametersteel bolt is placed in the aluminum sleeve. The nut is tightened until the normal stress in the bolt is 80 MPa. Determine the normal stress in the sleeve.
Demand for a particular product is normally distributed with a mean of 100 units and a standard deviation of 20 per period. What is the expected cycle service level ( aka type 1 service level)?
The bottle in the figure rides on a conveyor belt. (Part A figure) If the belt's acceleration is = 3.65 , determine the minimum coefficient of static friction that prevents the bottle from slipping
Water flows in a 5-m-wide channel with a speed of 2 m/s and a depth of 1m. The channel bottom slopes at a rate of 1 m per 1000 m. Determine the Manning coefficient for this channel.
A fuel oil is analyzed and found to contain 85.0 wt% carbon, 12.0% elemental hydrogen (H), 1.7% sulfur, and the remainder noncombustible matter.
The Froude number changes from a subcritical value of 0.5 to a supercritical value of 3.0. Determine the channel width at 2 if it is 12 ft wide at 1.
A rectangular channel 3-m-wide carries 10 m^3/s at a depth of 2m. Is the flow subcritical or supercritical? For the same flowrate, what depth will five critical flow?
A four-cylinder two-stroke 2.0-L diesel engine that operates on an ideal Diesel cycle has a compression ratio of 22 and a cutoff ratio of 1.8. Air is at 70°C and 97 kPa at the beginning of the c
Water is transferred at a rate of 2.1 cfs from an upper reservoir to a lower reservoir by a concrete pipe 3000 ft long. the difference in water level is 60 ft. determine the size of pipe for a water
Determine the critical load of a pinned pinned column by the following methods. Solving the second order differential equation.
Find enthalpy and entropy at each phase. Also find all sources of entropy in cycle. Then explain why cycle does not work.
A steam power plant has a high pressure of 3 MPa, and it maintains 60°C in the condenser. A condensing turbine is used, but the quality should not be lower than 90% at any state in the turbine.
5 Lbm of Refrigerant 22 (R-22) is contained in a piston cylinder device. The R-22, initially at a pressure of 30 psia and a volume of 4 ft^3, is heated at constant pressure until the temperature is
Estimate the force and power required to overcome skin friction drag at a cruising speed of 13 kt in sewater at 10 degrees centigrate?
A spring having an unstreched length of 2ft has one end attached to a 10lb ball. Determine the angle of the spring when the ball has a speed of 6 ft/s tangent to horizontal cicular path. k=20lbs.