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Determine: a. The rate of heat removal from the refrigerated space. b. The power input to the compressor. c. The rate of heat rejection to the environment. d. The COPR.
An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 1000 kPa and the evaporator at 4oC.
Calculate the thermal efficiency of the cycle for compression ratios of a) 10:1 b) 12:1 c) 15:1 Compare with the appropriate Carnot efficiency. Assume constant specific heats.
How to convert the uneven diameter of the hollow tube in to a solid tube (same stresst) ( keep the length the same)? what equation to use? moment of Inertia?
The 2-lb box has a velocity of 5 ft/s when it begins to slide down the smooth inclined surface at A. The coordinates of point C are x = 17.66 ft, and y = 8.832 ft Determine the time to travel from
Determine the mass flow rate of hot water withdrawn from the tank during the shower and the average temperature of mixed water used for the shower.
Assume both will be worthless after 6 years and that the interest rate is %9.0. Determine by the equivalent uniform annual cost method which alternative is the better buy.
The NIST online database to get the enthalpy and density of water for the given conditions. a. Determine the mass flow rate of the water in kg/min. b. Determine the diameter of the pipeline.
If the efficiency of the longitudinal joint is 80% then calculate the working pressure assuming a safe working pressure of 50 N/mm2.
The sphere approaches the 25 degree incline of height 3 m, and rolls up the incline without slipping. a. Find the initial KE (translation and rotation). b. Find the velocity at the top of the inclin
Determine a.) the boundary work needed for this process and b.)the temperature after compression.(Use ideal gas equation; pressure given is absolute and R=0.1889 kJ/kg-K).
Determine the uncertainty of the velocity measured when the uncertainty of the manometer reading is +/- 2mm. R = 0.287 kPa*m^3 / kg*K water density = 1000 kg/m3
This 6" pipe has a sudden enlargement to an 8" (nominal pipe size) schedule 40 steel pipe and continues for another 200 ft with a submerged discharge. If the water is at 60 deg.F, what is the total
The volume of the mold cavity forming the outside surface of the casting = 5000 cm3. What is the weight of the final casting?
A piston-cylinder device contains 2.5 kg of air at 150 kpa and 2 m^3. the air is now compressed according to the relationship PV^2 = constant until it reaches 1 m^3. Determine the boundary work.
Assuming that the coefficient of kinetic friction the tires and road is 0.9and the coefficient of restitution of the impact is0.5, calculate the velocity of A just before impact.
Determine 1) the pressure and volume at the initial state. 2) the pressure and volume at the final state and 3) the total work.
Cutting conditions are: v = 2.5 m/s, f = 0.3 mm/rev, and d = 2.0 mm. Determine: (a) cutting time, and (b) metal removal rate.
Find the optimal compression ration in terms of the upper and lower temperature limits of operation. the optimal compression ratio should yield maximum specific works.
Calculate the entropy change in Btu/lbmR B. Calculate the heat transfer in Btu/lbm C. Sketch this process in a T-S diagram D. Is this process possible?
Combustion occurs with 20% excess air. Assume all fuel nitrogen is converted to NO2, and that no thermal NO2 forms. Calculate the NO2 concentration (ppm) in the exhaust gas.
Assume 35% of fuel nitrogen converts to NO, and that fuel NO is 80% of total NO (the remainder being thermal NO). Calculate a) the NO concentration (ppm) in the exhaust gas and b) the daily producti
Determine the NO2 emissions rate (lb/hr) from a steam plant that uses sugar mill waste (3300 BTU/lb) to generate 1000 lb steam/ hr.
Is the heat transfer one, two, or three dimensional? Is there heat generation in the medium? Is the thermal conductivity of the medium constant or variable?
To avoid warping, the temperature difference across the wafer thickness cannot exceed 20C. if the upper surface of the silicon wafer is at a uniform temperature of 600 K; determine the maximum allow