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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 refrigeration maintaining a space at 2oC. The surroundings to which the system rejects energy by heat transfer reach a maximum temperature of 40oC. For effective heat transfer, the system requires a temperature difference of at least 20oC between the condensing refrigerant and the surroundings and between the vaporizing refrigerant and the refrigerated space. The project manager wished to install a system that minimizes the annual cost for electricity (monthly electricity cost is fixed at 5.692 cents/kWh for the first 250 kWh and 6.006 cents/kWh for any usage above 250 kWh). 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, R-22 and R-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 making a final selection? Prepare a written report and presentation including results, conclusions and recommendations.
Determine the window heat loss and associated weekly cost with the ill-fitting insulation in place. The insulation will significantly reduce the radia- tion losses through the window. Losses will be due almost entirely to convection.
it is found that 10 btus of heat must be supplied to a house in order to maintain its temperature at 70of when the
Explain any anomalies - differences from theory or what you thought should happen. Is a linear approximation sufficient to describe and predict the relationship between load and output voltage?
an airplane flies horizontally at 55.0 ms. its propellernbspdelivers 1500 n of thrust forward force to overcome
10 [kg] of refrigerant 134a contained in a piston-cylinder assembly undergoes a polytropic process for which Pvn = Constant. The initial and final states of the refrigerant are: P1= 240 [kPa], T1= -5 [oC], and P2= 960 [kPa], T2= 70 [oC], respectively..
Liquid propanol at 250C is burned with air at the same temperature in an atmospheric pressure combustor operating at steady conditions. Products of combustion are cooled to a temperature of 250C. Enthalpy of formation of liquid propanol = -301,000 kJ..
determine the volume required to store 25kg of ethane at 320kpa and 35 degrees celsius. if the temperature rises to 65
a gas is contained in a vertical frictionless piston-cylinder device. the piston has a mass of 4kg and a cross
Research some applications of CAD (Computer Aided Design) that is used by Engineers in the many different Industries today. Can CAD be used in non-engineering applications? What are some other CAD programs that exists and how do they differ from..
a cylindrical graphite pure carbon rod of length 25 cm and initial diameter of 2 cm is inserted into a flowing air
refrigerant 134a undergoes a constant pressure process from saturated vapor at -18.8degc to a final temperature of
you are an engineer in an electric-generation station. you know that flames in the boiler reach a temp of 1200 k and
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