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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.
a two-stage air compressor operates at steady state compressing 10 m3min of air from 100kpa 300 k to 1200 kpa. an
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an electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive
A 3 DOF robot manipulator is shown in Figure 1. a) Give a complete D-H parameter table. b) Give the three A-matrices that correspond to this robot. c) Obtain the forward kinematics equations for this robot. d) Solve the inverse kinematics problem. e)..
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A water tower sits atop a residential building as shown in the figure below. A 0.3m X 0.3m patch was used to repair damage from a recent storm. Water is supplied to the building via a 0.2m diameter main that connects to a faucet in the building's cou..
Obtain your best estimate of the distance in meters covered by the body from t = 5 sec to t = 13 sec using either the Simpson's 1/3rd rule or the trapezoidal rule. Choose as many segments as you please
The ladder has a uniform weight of 80 lb and rests against the smooth wall at B. If the coefficient of static friction at A is mu(a)= 0.4, determine if the ladder will slip. Take theta= 60 deg
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for the vapor power cycle steam enters the at 3 mpa and 500 c and leaves at 70 kpa and 200 c. the system is operating
Calculate the change in free-energy associated with the formation of a critical spherical nucleus in pure liquid nickel that is 200 ºC under cooled. Properties of Nickel: Heat of Fusion 2660 J/cm3; Surface Energy 255x10-7 J/cm2 ; Freezing Temperatur..
Provide formulae for computing the number of read stall cycles and write stall cycles for a given program executing on a given machine.
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