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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.
an air-standard otto cycle uses 0.1 kg of air and has a clearance of 17%. THe intake conditions are 98 kPa and 37 C and the energy released during combustion is 1600 KJ/kg. What is the compression ratio of the cycle?
steam enters an adiabatic turbine at 10 mpa and 500 degc and leaves at 10 kpa with a quality of 90. neglecting
1- describe some of the important steps in the preparation of a written document. what role do written documents play
a water barometer was observed at a school on a recent trip. it was basically a tube filled with water in a container.
an isobaric heating process raises the temparature of one of one mole of an ideal gas by delta t 100 k. the heat
a vibrating system has a mass m 10kg suspended from a spring of modulus k 2500nm nd damping amunts to c 45 nsm.
Calculate the head provided by the pump and Calculate the brake power required if the pump efficiency is 75% (kW).
a simple wheatstone bridge as shown in fig. 7.10 is used to determine accurately the value of an unknown resistance r1
the entire assembly is placed in an environment whose temperature is 200c. determine the volume of chamber 1 when thermodynamic equillibrium has been estabilished.
Discussion of various cycles attempted to meet the goal as well as the positive and negative aspects of your design.
The tank cover is airtight, and the pressure above the water surface is 2 atm gage. The system is at sea level. Determine the max height to which the water stream could rise.
a steel mill has a production set up where metal sheets are rolled for desired thickness as they emerge from the
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