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The performance of an ammonia absorption cycle refrigerator is to be compared with that of a similar vapor-compression system. Consider an absorption system having an evaporator temperature of ?10°C and a condenser temperature of 50°C. The generator temperature in this system is 150°C. In this cycle 0.42 kJ is transferred to the ammonia in the evaporator for each kilojoule transferred from the high-temperature source to the ammonia solution in the generator. To make the comparison, assume that a reservoir is available at 150°C, and that heat is transferred from this reservoir to a reversible engine that rejects heat to the surroundings at 25°C. This work is then used to drive an ideal vapor-compression system with ammonia as the refrigerant. Compare the amount of refrigeration that can be achieved per kilojoule from the high-temperature source with the 0.42 kJ that can be achieved in the absorption system.
Why does the definition of NPSH include the dynamic head of the fluid? Isn't cavitation based only on the difference between the static head and the local vapor pressure?
a engineer designs a heat engine using flat-plate solar collectors. the collectors deliver aeat at 70 degrees c and
air enters a compressor at 14 psia 80 f with negliible speed and is discharged at 70 psia 500 f with a speed of 500
1. an employee at general electric must order bottles of compressed methane to run her gas oven test facility. the
consider a wind turbine with a 90-m blade span subjected to 25-kmh steady winds. if the combined turbine-generator
compute the second specimen's radius after deformation.
A piston-cylinder device contains 0.8kg of steam at 300 degrees C and 1 MPa. Steam is cooled at constant pressure until one-half of the mass condenses.
If the minimum attractive rate of return is20% per year, determine the one machine that should be selected on the basis of a rate of return analysis.
The school cafeteria has found that they go through 9 sandwiches for every 6 tickets they sell to the students. Today they have 558 sandwiches available. How many lunch tickets can they sell today?
What are different types of Nuclear reactors in operation in thev world.
air at a pressure of 400kpa and a temperature of 700 degree celsius expands in a turbine at steady state to a pressure
Find the diameter of a pipe to convey the superheated steam flowing into the mixing process if the speed of the steam is 20m/s and also ascertain the condition of the resulting mixture.
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