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A refrigerator operating on the vapor-compression refrigeration cycle using refrigerant-134a as the refrigerant is considered. The temperature of the cooled space and the ambient air are at 108F and 808F, respectively. R-134a enters the compressor at 20 psia as a saturated vapor and leaves at 140 psia and 1608F. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 45,000 Btu/h. Determine
(a) the mass flow rate of R-134a and the COP,
(b) the exergy destruction in each component of the cycle and the secondlaw efficiency of the compressor, and
(c) the second-law efficiency of the cycle and the total exergy destruction in the cycle.
A 27ft beam has a uniform load of 6kip/ft. along its entire length. From left to right x=0ft to x=27ft. At x=0 ft it is pinned and at x=18 ft there is a roller. So, the 9 ft end section is cantilevered.
Water in the amount of 1 lb is contained in a rigid closed tank. Initially the water has a quality of 0.4 at a pressure of 10 lbf/in2. Through a stirrer, work is provided to the water in the tank until the pressure quadruples.
two solid cylindrical rods are joined at B and loaded as shown rod AB is made of steel(E=200 GPa) and rod BC of brass ( E = 105GPa) determine a) the total deformation of composite rod ABC, b) the deflection of point B
An hydraulic motor is connected with a hose to a pump and powers a conveyor on a harvesting machine. Oil flows in a 16 ft hydrualics hose from the pump to the motor.
Annual rare based on amount of products which can ordinarily be shipped each year as a function of the amount of vehicles or service purchased with the first cost and the M&O costs.
What is the final equilibrium temperature of the two bodies?
You fill a 2-cubic foot wheelbarrow to the top with aggregate. if the specific gravity of the aggregate is 2.548 and 18% of the aggregate is void spaces, how much does the aggregate in the wheelbarrow weight?
A pressurized steel tank has a radius r=0.6m, a wall thickness t=18mm and an internal pressure p of 2.8 MPa.The steel has a modulus of elasticity E of 200 GP and a poissons ratio 0.30.
Water at 120 0C with a quality of 25 % has itstemperature raised 20 0C in a constant volumeprocess. What is the new quality and pressure? Draw P-vand T-s diagrams
For a drainage area of 5,187mil^2 mean annual runoff is determined to be 3,708ft^3/s and the annual averge rainfall is 35.5 inches. Estimate the annual ET losses in inches for the area. ( 1 mile = 5,280ft)
An equal-tangent crest curve connects a +2% initial grade with a -1% final grade, and is designed for 55mi/h. The station of the PVI is 233 + 40 with elevation 1203 ft. What is the elevation of the curve at station 234+00
Assume to just using coal as an electric energy source. Take efficency as %50 for average power plant.If the carbondioxide level is 400 ppm by volume now, what will be the carbondioxide level 10 years later
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