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The design of a simple refrigerant condenser has been proposed for opment. The condenser will accept hot, high pressure saturated type R-134a from a compressor to reject its heat to ambient air at standard mospheric conditions. The cooled refrigerant is drained back to an evaporation through an expansion valve to complete a standard refrigeration cycle. The design Concept will be to use bare 3/8-in. Outer diameter tubes arranged staggered tube bank. To simplify the design, there will be only one tube and one tube outlet into and out of the bank, respectively. No front end or rear end headers will be considered. It is hoped that the pressure drop a tube bank will be kept as low as possible to ensure the smallest possible fan size. The System will operate under the following conditions.
(i) Four rows of tubes
(ii) Sixteen tubes per row
(iii) Width is 32 in.
(iv) Entering air temperature is 95degreeF
(v) Coil face velocity is not to exceed 700 ft/min
(vi) R-134a enters at a saturation pressure of 200 psia (assume liquid phase) Determine the heat rejected by the Condenser and the temperature of the
the allowable shearing stress is 15ksi in a steel rod ab and 8ksi in a brass rod bc. knowing that a torque of magnitude
a 4.53 kg mass attached to the lower end of a spring whose upper end is fixed vibrates with a natural period of 0.45
Express T(x) as a Fourier series expansion consisting of sine terms only.
determine the largest value of
An actuating lever in an electrical device must open and close almost instantly and carry a high current when closed. What design requirements would be important for this application? Design a material and its processing to meet these requirements..
A uniform, thin, rigid bar AB having mass M and length b is attached to a uniform flexible beam BC. Assume a small transverse displacement v(x, t). Using appropriate diagrams (free-body and kinematics), determine the boundary conditions for the be..
Determine whether the following two requirements are satisfied:- The maximum shear stress is not to exceed 10,000 psi.- The angle of twist is not to exceed 1°.
Express your answer in terms of the circulation. Assume that the fluid level in the tank at a large distance from the opening at A remains constant and viscous effects are
1. a coil with 60 turns is placed in a magnetic field of 0.02 tesla. the coil is supplied with dc current of 200 amps
Gasoline (sg = 0 .67) is flowing at 0 .11 m3 / s in the fabricated tube shown in Fig. 6.19. If the pressure before the contraction is 415 kPa, calculate the pressure in the smaller tube.
A long, solid cylinder of radius 2 ft hinged at point A is used as an automatic gate, as shown in Fig. P3-61E. When the water level reaches 15 ft, the cylindrical gate opens by turning about the hinge at point A.
find the stresses developed in the machine. Use two beam elements for the column and one beam element for the arm. Assume the material of the machine as steel.
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