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A vapor compression refrigeration cycle using R-134a as the working fluid has an evaporator temperature of -20°F, and a condenser pressure of 140 psia. The refrigerant is saturated at the inlet to the compressor and at the exit of the condenser. The adiabatic compressor efficiency is 84%. Determine the system COP.
steam flows through a passageway and at a particular location the pressure is 3 bar the temperature is 281.48c and the
two resistors are given r1 470 ohms and r2 1200 ohms a the two resistors are connected in series with a 48 v source.
saturated liquid water at 25 degrees c is pumped to a pressure of 5 mpa in an isothermal process. the specific work
1. list and explain the desirable mechanical and physical properties for a an elevator cable b paper clip and c
saturated liquid refrigerant r-134a at 11.59 bar enters an adiabatic throttling valve which drops the pressure to 4.00
the driveshaft of a buildings air-handling fan is turned at 300 rpm by a belt running on a 0.3- m-diameter pulley. the
an ideal carnot heat engine has an efficiency of 40. if the high temperature is raised 15 what is the new efficiency
the position of a point p on a line is given by the equation x t sinpi t2. the point starts moving at t0. find the
air flows through a turbine airfoil passage in the shape of a converging-only nozzle with an exit cross-sectional area
a cannonball is fire with initial speed of 1600 ftsec. the cannon recoils and strikes a plate attached to a spring.
Explain whether the following situations and should be modeled as closed systems, control volume systems, or transient systems. Convert the following temperatures to °F, °C, K, R (4 pts) a. 98.6 °F b. 298 K c. 5715 °F e. 100 °C. Convert the following..
steel rods of 0.05m diameter are heat treated by being passed through a heat-treating furnace in which the atmosphere
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