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A vapor-compression refrigeration system operating continuously is being considered to provide a minimum of 80 tons of refrigeration for an industrial refrigerator maintaining a space at 28C. The surroundings to which the system rejects energy by heat transfer reach a maximum temperature of 408C. For effective heat transfer, the system requires a temperature difference of at least 208C between the condensing refrigerant and surroundings and between the vaporizing refrigerant and refrigerated space. The project manager wishes to install a system that minimizes the annual cost for electricity (monthly electricity cost is fixed at 5.692 cents for the first 250 kW ? h and 6.006 cents for any usage above 250 kW ? h). You are asked to evaluate two alternative designs: a standard vapor- compression refrigeration cycle and a vapor-compression refrigeration cycle that employs a power-recovery turbine in lieu of an expansion valve. For each alternative, consider three refrigerants: ammonia, Refrigerant 22, and Refrigerant 134a. Based on electricity cost, recommend the better choice between the two alternatives and a suitable refrigerant. Other than electricity cost, what additional factors should the manager consider in makig a final selection? Prepare a written report including results, conclusions, and recommendations.
air is expanded from 2000 kpa and 500c to 100kpa and 50c. assuming constant specific heats determine the change in
air flows steadily through an adiabatic non-ideal turbine entering at 150 psia 900degf and 350 fts and leaving at 20
a closed system contains 2-kg of air undergoes an isothermal process from 600 kpa and 200oc to 80 kpa. determine the
A flat surface 4m wide and 10m long is exposed to air flow parrallel to its long side. The speed of the air is 55 km/h and the temperature is 5C. If the temp of the surface is constant at 12C, calculate the heat loss from the surface. Air properties ..
What is the rate of water loss (kg/s) from the first, third, and fourth trays? Estimate the temperature of the water in each of the designated trays.
an engineer claims to be able to compress 0.100 kg of water vapor at 200degc and 0.100 mpa in a piston-cylinder
a mining engineer plans to do hydraulic mining with a high-speedjet of water. a lake is located h300 m above the mine
a single unit of product a requires 2.4 minutes of punch press time and 5.0 minutes of assembly time. the profit for
an ideal cold air-standard brayton cycle engine operates with air entering the compressor at 27 c. the pressure ratio
1.7 pound-mass of water fills a container whose volume is 3.7ftsup3. the pressure in the container is 70 psia. how do
the rod of the fixed hydraulic cylinder is moving to the left with a constant speed. determine the corresponding
calculate: a) the overall train value. b) the output rational speed at shaft 5. c) the output torque at shaft 5. Relevant gear data is= NA= 17, NB= 36, NC= 19, ND= 41, worm E = double lead, worm G = triple lead, NH= 37?
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